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submission 9828

KernelBot user 3 · python · License unknown

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No package. Vendor the mirrored source: 1 lines, June 9 Researcher Reciprocity License v1.0.

fp8_gemm.py
curl "https://kernelindex.com/api/v1/implementations/kernelbot-amd-fp8-mm-9828?include=source"
interfacepython
Compatibility
measured onAMD Instinct MI300X
declared hardwareAMD Instinct MI300X
architecturesgfx942
dtypesfp32, fp8_e4m3fnuz

Benchmark evidence

18 measurements across 1 GPU, fastest first.

Operation / workload
Hardware
Latency
Rank
Observed
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 256]
AMD Instinct MI300X
36.1µs
#13 of 98
2025-04-27
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 512]
AMD Instinct MI300X
36.2µs
#13 of 98
2025-04-27
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 1536]
AMD Instinct MI300X
56.9µs
#25 of 98
2025-04-27
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 256]
AMD Instinct MI300X
105.3µs
#34 of 98
2025-04-27
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 512]
AMD Instinct MI300X
106.3µs
#31 of 98
2025-04-27
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 2048]
AMD Instinct MI300X
111.7µs
#25 of 98
2025-04-27
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=576 · seed=12346
AMD Instinct MI300X
116.0µs
#49 of 98
2025-04-27
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=512 · seed=6563
AMD Instinct MI300X
116.6µs
#48 of 98
2025-04-27
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=1536 · seed=8135
AMD Instinct MI300X
118.5µs
#27 of 98
2025-04-27
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 2304]
AMD Instinct MI300X
120.5µs
#28 of 98
2025-04-27
Show all 18 measurements ›
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=576 · seed=9863
AMD Instinct MI300X
179.3µs
#31 of 98
2025-04-27
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=512 · seed=12341
AMD Instinct MI300X
182.0µs
#37 of 98
2025-04-27
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 1536]
AMD Instinct MI300X
185.0µs
#39 of 98
2025-04-27
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=4608 · seed=7531
AMD Instinct MI300X
211.8µs
#38 of 98
2025-04-27
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=1536 · seed=6543
AMD Instinct MI300X
359.6µs
#35 of 98
2025-04-27
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 2048]
AMD Instinct MI300X
479.7µs
#43 of 98
2025-04-27
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 2304]
AMD Instinct MI300X
537.0µs
#43 of 98
2025-04-27
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=4608 · seed=65436
AMD Instinct MI300X
1.09ms
#48 of 98
2025-04-27

Reported · How evidence levels are derived →

Source and license

sourceavailable
revision digestsha256:e8edbdf6de9c8d43b1ade54ff96082ff953c9919617d73fc3a088d9da35e48e5
license declaredunknown
license concludedunknown
imported2026-08-15

Kernel source

fp8_gemm.py1 lines
#!POPCORN leaderboard amd-fp8-mm
#!POPCORN gpu MI300
from task import input_t, output_t
import torch
from torch.utils.cpp_extension import load_inline
import time
import os
import sys

if "PYTORCH_ROCM_ARCH" not in os.environ:
    os.environ["PYTORCH_ROCM_ARCH"] = "gfx942:xnack-"

TESTING = os.environ.get("GPUMODE_TESTING", None)

kernel_cpp = r"""
#include <hip/hip_runtime.h>
#include <hip/hip_fp16.h>
#include <hip/hip_bf16.h>
#include <hip/hip_fp8.h>
#include <pybind11/pybind11.h>
#include <iostream>
#include <iomanip>
#include <bit>

#define HIP_CHECK(condition)                                                                  @
    do                                                                                        @
    {                                                                                         @
        hipError_t error = condition;                                                         @
        if(error != hipSuccess)                                                               @
        {                                                                                     @
            std::cerr << "Error " << hipGetErrorName(error) << '(' << error << ')' << ": "    @
                      << hipGetErrorString(error) << " in " << __func__ << " at " << __FILE__ @
                      << ':' << __LINE__ << '@n';                                             @
            exit(error);                                                                      @
        }                                                                                     @
    }                                                                                         @
    while(false)

using fp8 = __hip_fp8_e4m3_fnuz;
using bf16 = __hip_bfloat16;
using fp32 = float;
using fp32x4 = fp32 __attribute__((ext_vector_type(4)));
using i32x4 = int32_t __attribute__((ext_vector_type(4)));
using fp32x16 = fp32 __attribute__((ext_vector_type(16)));

struct cube {
    int m, n, k;
};

constexpr int warp_size = 64;
constexpr int cache_line_size = 128;

constexpr int m_block_size_multiple = 32;
constexpr int n_block_size_multiple = 32;
constexpr int k_block_size_multiple = 128;

using register_type = uint32_t;

template <typename T, typename U>
__host__ __device__ __forceinline__
constexpr auto ceil_div(T a, U b) {
    return (a + b - 1) / b;
}

template<auto a, auto b>
__host__ __device__ __forceinline__
constexpr auto divide_exact() {
    static_assert(a % b == 0, "does not divide exact!");
    return a / b;
}

template<int inc, typename seq>
struct multiply_by_inc;

template<int inc, int... Is>
struct multiply_by_inc<inc, std::integer_sequence<int, Is...>> {
    using type = std::integer_sequence<int, (inc * Is)...>;
};

template<int I, int N, int inc, int... Is>
struct make_index_sequence_with_inc_helper {
    using type = typename multiply_by_inc<inc, std::make_integer_sequence<int, (N - I) / inc>>::type;
};

template<int I, int N, int inc>
using make_index_sequence_with_inc = typename make_index_sequence_with_inc_helper<I, N, inc>::type;

template<typename F, int... Is>
__device__ __forceinline__
void unroll_apply(F f, std::integer_sequence<int, Is...>) {
    (f.template operator()<Is>(), ...);
}

template<int I, int N, int inc = 1, typename F>
__device__ __forceinline__
void unroll(F f) {
    unroll_apply(f, make_index_sequence_with_inc<I, N, inc>{});
}

template<int I, typename F>
__device__ __forceinline__
void unroll1d(F f) {
    unroll<0, I>(f);
}

template<int I, int J, typename F>
__device__ __forceinline__
void unroll2d(F f) {
    unroll<0, I>([&]<int i> {
        unroll<0, J>([&]<int j> {
            f.template operator()<i, j>();
        });
    });
}

template<int I, int J, int K, typename F>
__device__ __forceinline__
void unroll3d(F f) {
    unroll<0, I>([&]<int i> {
        unroll<0, J>([&]<int j> {
            unroll<0, K>([&]<int k> {
                f.template operator()<i, j, k>();
            });
        });
    });
}

template <typename T, size_t N>
__device__ __forceinline__
void clear(T (&array)[N]) {
    unroll<0, N>([&]<int i> {
        array[i] = T{0};
    });
}

__device__ __forceinline__
bf16 bf16_from_fp32(float x) {
    // HIP's conversion function does all kinds of checks
    // for odd cases (NaN, subnormals) that we don't care about.
    // This generates absolutely abysmal code, so just truncate
    // the upper bits to get the right value like the
    // Opperpython intended.

    return std::bit_cast<bf16>(
        static_cast<uint16_t>(
            std::bit_cast<uint32_t>(x) >> 16
        )
    );
}

__device__ __forceinline__
fp32 fp32_from_fp8(fp8 x) {
    // HIP's conversion from fp8 to fp32 is slow on anything that
    // doesn't have the hardware instructions to do it. The software
    // method deals with special cases (NaN, subnormals), but we
    // don't care about that here since we don't expect those in
    // the input. Therefore, we can optimize the software implementation
    // by just shuffling the bits.
#ifdef __gfx942__
    // MI300 has an instruction for this.
    return float(x);
#else
    // Fallback case
    // TODO: Find a faster option
    return float(x);
#endif
}

template <typename F>
__device__ __host__ __forceinline__
void select(bool cond, F f) {
    if (cond) {
        f.template operator()<true>();
    } else {
        f.template operator()<false>();
    }
}

template<int dpp_ctrl, int row_mask = 0xf, int bank_mask = 0xf, bool bound_ctrl = false>
__device__ __forceinline__
uint32_t shfl_dpp(uint32_t x) {
    return __builtin_amdgcn_update_dpp(x, x, dpp_ctrl, row_mask, bank_mask, bound_ctrl);
}

template<int lane_stride>
__device__ __forceinline__
uint32_t transpose_4x4_f8_v2(uint32_t input) {
    static_assert(lane_stride < warp_size / 4, "lane stride is too large");
    static_assert((lane_stride & (lane_stride - 1)) == 0, "line stride has to be a power of 2");
    static_assert(lane_stride == 1, "DPP implementation requires lane_stride == 1");
    // input:
    // byte 0 1 2 3
    //      0 1 2 3 lane X
    //      4 5 6 7 lane X+lane_stride
    //      8 9 A B lane X+lane_stride
    //      C D E F lane X+lane_stride
    // swap pairs of lanes to get
    // 0 1 2 3
    // 4 5 6 7
    // C D E F
    // 8 9 A B
    // then use byteperm to swap pairs horizontally + merge the
    // two results to get 2x2 transposed
    // 0 4 2 6
    // 1 5 3 7
    // 8 C A E
    // 9 D B F
    const auto lane = __lane_id();
    const auto group_lane_index = lane / lane_stride % 4;
    const auto t2x2 = __builtin_amdgcn_perm(
        // __shfl_xor(input, lane_stride), // Swap pairs
        shfl_dpp<0b10'11'00'01>(input),
        input,
        group_lane_index % 2 == 0
            ? 0x06'02'04'00
            : 0x03'07'01'05
    );
    // Now swap groups of 2 horizontally, and do the
    // same byteperm operation except with groups of 2x2.
    // 0 0 1 1     0 0 2 2
    // 0 0 1 1 --> 0 0 2 2
    // 2 2 3 3     1 1 3 3
    // 2 2 3 3     1 1 3 3
    const auto t4x4 = __builtin_amdgcn_perm(
        // __shfl_xor(t2x2, lane_stride * 2), // Swap groups
        shfl_dpp<0b01'00'11'10>(t2x2),
        t2x2,
        group_lane_index < 2
            ? 0x05'04'01'00
            : 0x03'02'07'06
    );

    // input = (lane << 24) | (lane << 16) | (lane << 8) | lane;
    return t4x4;
}

__device__ uint8_t llvm_amdgcn_raw_buffer_load_b8(i32x4 srsrc, uint32_t voffset, uint32_t soffset, uint32_t coherency)
    __asm("llvm.amdgcn.raw.buffer.load.i8");

__device__ uint16_t llvm_amdgcn_raw_buffer_load_b16(i32x4 srsrc, uint32_t voffset, uint32_t soffset, uint32_t coherency)
    __asm("llvm.amdgcn.raw.buffer.load.i16");

__device__ uint32_t llvm_amdgcn_raw_buffer_load_b32(i32x4 srsrc, uint32_t voffset, uint32_t soffset, uint32_t coherency)
    __asm("llvm.amdgcn.raw.buffer.load.i32");

__device__ uint64_t llvm_amdgcn_raw_buffer_load_b64(i32x4 srsrc, uint32_t voffset, uint32_t soffset, uint32_t coherency)
    __asm("llvm.amdgcn.raw.buffer.load.i64");

__device__ __uint128_t llvm_amdgcn_raw_buffer_load_b128(i32x4 srsrc, uint32_t voffset, uint32_t soffset, uint32_t coherency)
    __asm("llvm.amdgcn.raw.buffer.load.i128");

template <typename T>
struct buffer {
    struct buffer_resource {
        const void* ptr;
        uint32_t range;
        uint32_t config;
    };

    buffer_resource rsrc;

    __device__ __forceinline__
    buffer(T* pointer, uint32_t size) {
        this->rsrc = buffer_resource{
            reinterpret_cast<const void*>(pointer),
            static_cast<uint32_t>(size * sizeof(T)),
            // This is what CK uses, but what does it mean? It seems to mean DATA_FORMAT = 32 bit
            // We might be able to play with this later...
            0x00020000U
        };
    }

    template<int N>
    __device__ __forceinline__
    std::array<T, N> load(
        uint32_t wave_offset,
        uint32_t thread_offset
    ) const {
        constexpr const int load_size = sizeof(T) * N;

        using result_type = std::array<T, N>;

        if constexpr (load_size == 1) {
            return std::bit_cast<result_type>(llvm_amdgcn_raw_buffer_load_b8(
                std::bit_cast<i32x4>(this->rsrc),
                thread_offset,
                wave_offset,
                0
            ));
        } else if constexpr (load_size == 2) {
            return std::bit_cast<result_type>(llvm_amdgcn_raw_buffer_load_b16(
                std::bit_cast<i32x4>(this->rsrc),
                thread_offset,
                wave_offset,
                0
            ));
        } else if constexpr (load_size == 4) {
            return std::bit_cast<result_type>(llvm_amdgcn_raw_buffer_load_b32(
                std::bit_cast<i32x4>(this->rsrc),
                thread_offset,
                wave_offset,
                0
            ));
        } else if constexpr (load_size == 8) {
            return std::bit_cast<result_type>(llvm_amdgcn_raw_buffer_load_b64(
                std::bit_cast<i32x4>(this->rsrc),
                thread_offset,
                wave_offset,
                0
            ));
        } else if constexpr (load_size == 16) {
            return std::bit_cast<result_type>(llvm_amdgcn_raw_buffer_load_b128(
                std::bit_cast<i32x4>(this->rsrc),
                thread_offset,
                wave_offset,
                0
            ));
        } else {
            static_assert(load_size == -1, "load size not implemented");
        }
    }
};

// A general fast global memory needs to be as follows:
// - Group of 16 bytes so that we can use a 128-bit load
// - The fast path requires entire cache lines to be loaded at once. CDNA3
//   cache line size is 128 bytes, so the ideal matrix size has an inner
//   dimension (block_tile_m; source is column major) of at least 128.
// - We want every thread to participate, so we need at least
//   block_size / (128 / 16) elements in the N direction.
//   block_size == 64 => 8
//   block_size == 256 => 32
//   block_size == 1024 => 128
// - We assume that the input is already aligned to 128 bits, and that the m stride
//   is also aligned such. m, n, k are all divisible by 64, so this should be fine.
//
//   ┌───┬───┬───┬───┐ ┌───┐
//   │0  │4  │8  │12 │ │   │ = 16 bytes
//   ├───┼───┼───┼───┤ └───┘
//   │1  │5  │9  │13 │
//   ├───┼───┼───┼───┤
//   │2  │6  │10 │14 │
//   ├───┼───┼───┼───┤
//   │3  │7  │11 │15 │
//   └───┴───┴───┴───┘
template<
    int block_size,
    int block_tile_m,
    int block_tile_n,
    typename load_type
>
struct block_loader {
    static_assert(block_tile_m % sizeof(load_type) == 0, "tile inner dimension has to be divisible by load type size");

    constexpr static int total_loads = block_tile_m * block_tile_n / sizeof(load_type);
    static_assert(total_loads % block_size == 0, "total amount of loads needs to be divisible by the block size");

    constexpr static int loads_per_block_tile_m = block_tile_m / sizeof(load_type);
    constexpr static int loads_per_thread = total_loads / block_size;

    constexpr static int group_size = 4; // Coincides with 4x4 transpose.

    using frg_type = std::array<load_type, loads_per_thread>;

    __device__ __forceinline__
    static frg_type load_from_global(
        const fp8* block_tile_src,
        int m,
        int n,
        int block_off_m,
        int block_off_n
    ) {
        const auto offset = block_off_n * m + block_off_m;
        block_tile_src += offset;
        const auto size = m * n - offset;
        const auto buf = buffer<const load_type>(reinterpret_cast<const load_type*>(block_tile_src), size);

        const int tid = threadIdx.x;

        frg_type result;

        unroll<0, loads_per_thread>([&]<int j> {
            const int i = j * block_size + tid;
            // const int row = i % loads_per_block_tile_m;
            // const int col = i / loads_per_block_tile_m;
            // const int src_off = row * sizeof(load_type) + col * m;

            // swizzle the lanes such that groups of 4 columns are next to eachother.
            const int group_index = i % group_size;
            const int group_bank = i / group_size;
            const int row = group_bank % loads_per_block_tile_m;
            const int col = group_index + group_bank / loads_per_block_tile_m * group_size;
            const int src_off = row * sizeof(load_type) + col * m;

            result[j] = buf.template load<1>(0, src_off)[0];
        });

        return result;
    }

    __device__ __forceinline__
    static void store_to_smem(
        fp8* block_tile_dst,
        frg_type thread_src,
        int m,
        int n,
        int block_off_m,
        int block_off_n
    ) {
        const int tid = threadIdx.x;

        // The buffer load allows us to omit bounds checking with loading,
        // but that then loads invalid elements. To fix that, we check
        // for each element whether its supposed to be in range, and if not
        // zero it out.

        unroll<0, loads_per_thread>([&]<int j> {
            const int i = j * block_size + tid;

            // swizzle the lanes such that groups of 4 columns are next to eachother.
            const int group_index = i % group_size;
            const int group_bank = i / group_size;
            const int row = group_bank % loads_per_block_tile_m;
            const int col = group_index + group_bank / loads_per_block_tile_m * group_size;

            const int src_row = row * sizeof(load_type) + block_off_m;
            const int src_col = col + block_off_n;
            const bool in_bounds = src_row < m && src_col < n;

            auto* dst = reinterpret_cast<uint8_t*>(block_tile_dst);

            // Store transposed
            // const auto src = std::bit_cast<std::array<uint8_t, sizeof(load_type)>>(thread_src[j]);
            // TODO: Check bounds?
            // unroll<0, sizeof(load_type)>([&]<int k> {
            //     const int dst_row = row * sizeof(load_type) + k;
            //     const int dst_col = col;
            //     dst[dst_col + dst_row * (block_tile_n + 4)] = in_bounds ? src[k] : 0;
            // });

            // Store transposed using 4x4 groups.
            const auto src = std::bit_cast<std::array<uint32_t, 4>>(thread_src[j]);
            constexpr int lane_stride = 1; //loads_per_block_tile_m;
            unroll<0, sizeof(load_type), sizeof(uint32_t)>([&]<int k> {
                const int dst_row = row * sizeof(load_type) + k;
                const int dst_col = col;
                auto v = src[k / sizeof(uint32_t)];
                v = in_bounds ? v : 0;
                v = transpose_4x4_f8_v2<lane_stride>(v);
                const auto group_lane_index = __lane_id() / lane_stride % 4;
                *reinterpret_cast<uint32_t*>(&dst[(dst_col - dst_col % 4) + (dst_row + group_lane_index) * (block_tile_n + 4)])
                    = v;
            });
        });
    }
};

template <int warp_tile_m_, int warp_tile_n_, typename T>
struct mfma_fragment {
    using type = T;

    constexpr static const int warp_tile_m = warp_tile_m_;
    constexpr static const int warp_tile_n = warp_tile_n_;

    constexpr static const int total_items = warp_tile_m * warp_tile_n;

    constexpr static const int items_per_thread = divide_exact<total_items, warp_size>();
    constexpr static const int registers_per_thread = divide_exact<items_per_thread * sizeof(T), sizeof(register_type)>();

    register_type regs[registers_per_thread];

    __device__ __forceinline__
    constexpr static mfma_fragment zero() {
        return mfma_fragment{{}};
    }

    __device__ __forceinline__
    std::array<T, items_per_thread>& thread_values() {
        return *reinterpret_cast<std::array<T, items_per_thread>*>(&this->regs);
    }

    __device__ __forceinline__
    const std::array<T, items_per_thread>& thread_values() const {
        return *reinterpret_cast<const std::array<T, items_per_thread>*>(&this->regs);
    }

    __device__ __forceinline__
    void clear() {
        unroll<0, registers_per_thread>([&]<int i> {
            this->regs[i] = 0;
        });
    }

    static constexpr int first_item_of_reg(int reg) {
        return reg * sizeof(register_type);
    }
};

template <int m, int n, int k>
struct mfma_f32_f32_f32;

template <>
struct mfma_f32_f32_f32<16, 16, 4> {
    using frg_a_type = mfma_fragment<16, 4, float>;
    using frg_b_type = mfma_fragment<16, 4, float>;
    using frg_c_type = mfma_fragment<16, 16, float>;

    __device__ __forceinline__
    static void execute(
        frg_c_type& c,
        const frg_a_type& a,
        const frg_b_type& b
    ) {
        c = std::bit_cast<frg_c_type>(
            __builtin_amdgcn_mfma_f32_16x16x4f32(
                std::bit_cast<float>(a),
                std::bit_cast<float>(b),
                std::bit_cast<fp32x4>(c),
                0,
                0,
                0
            )
        );
    }
};

template <>
struct mfma_f32_f32_f32<32, 32, 2> {
    using frg_a_type = mfma_fragment<32, 2, float>;
    using frg_b_type = mfma_fragment<32, 2, float>;
    using frg_c_type = mfma_fragment<32, 32, float>;

    __device__ __forceinline__
    static void execute(
        frg_c_type& c,
        const frg_a_type& a,
        const frg_b_type& b
    ) {
        c = std::bit_cast<frg_c_type>(
            __builtin_amdgcn_mfma_f32_32x32x2f32(
                std::bit_cast<float>(a),
                std::bit_cast<float>(b),
                std::bit_cast<fp32x16>(c),
                0,
                0,
                0
            )
        );
    }
};

template <int m, int n, int k>
struct mfma_f32_f8_f8;

template <>
struct mfma_f32_f8_f8<16, 16, 32> {
    using frg_a_type = mfma_fragment<16, 32, fp8>;
    using frg_b_type = mfma_fragment<16, 32, fp8>;
    using frg_c_type = mfma_fragment<16, 16, float>;

    __device__ __forceinline__
    static void execute(
        frg_c_type& c,
        const frg_a_type& a,
        const frg_b_type& b
    ) {
#ifdef __HIP_DEVICE_COMPILE__
#ifdef __gfx942__
    c = std::bit_cast<frg_c_type>(
        __builtin_amdgcn_mfma_f32_16x16x32_fp8_fp8(
            std::bit_cast<uint64_t>(a),
            std::bit_cast<uint64_t>(b),
            std::bit_cast<fp32x4>(c),
            0,
            0,
            0
        )
    );
#else
    // Fallback copied from CK, this way we can test on MI210.
    using fallback_mfma = mfma_f32_f32_f32<16, 16, 4>;
    const auto& a_values = a.thread_values();
    const auto& b_values = b.thread_values();
    unroll<0, frg_a_type::items_per_thread>([&]<int k> {
        const auto fallback_a = std::bit_cast<fallback_mfma::frg_a_type>(static_cast<float>(a_values[k]));
        const auto fallback_b = std::bit_cast<fallback_mfma::frg_b_type>(static_cast<float>(b_values[k]));
        fallback_mfma::execute(c, fallback_a, fallback_b);
    });
#endif
#endif
    }
};

template<>
struct mfma_f32_f8_f8<32, 32, 16> {
    using frg_a_type = mfma_fragment<32, 16, fp8>;
    using frg_b_type = mfma_fragment<32, 16, fp8>;
    using frg_c_type = mfma_fragment<32, 32, float>;

    __device__ __forceinline__
    static void execute(
        frg_c_type& c,
        const frg_a_type& a,
        const frg_b_type& b
    ) {
#ifdef __HIP_DEVICE_COMPILE__
#ifdef __gfx942__
    c = std::bit_cast<frg_c_type>(
        __builtin_amdgcn_mfma_f32_32x32x16_fp8_fp8(
            std::bit_cast<uint64_t>(a),
            std::bit_cast<uint64_t>(b),
            std::bit_cast<fp32x16>(c),
            0,
            0,
            0
        )
    );
#else
    // Fallback copied from CK, this way we can test on MI210.
    using fallback_mfma = mfma_f32_f32_f32<32, 32, 2>;
    const auto& a_values = a.thread_values();
    const auto& b_values = b.thread_values();
    unroll<0, frg_a_type::items_per_thread>([&]<int k> {
        const auto fallback_a = std::bit_cast<fallback_mfma::frg_a_type>(static_cast<float>(a_values[k]));
        const auto fallback_b = std::bit_cast<fallback_mfma::frg_b_type>(static_cast<float>(b_values[k]));
        fallback_mfma::execute(c, fallback_a, fallback_b);
    });
#endif
#endif
    }
};

// See CDNA3 manual, 7.1.4.1. Input layout
// The calculations here are obtained via the
// AMD matrix instruction calculator
// https://github.com/ROCm/amd_matrix_instruction_calculator
// There is a cleaner way to compute the mapping, but
// this is what the tool returns and I'm lazy. We only
// really need these two anyway for now.
template <typename mfma>
struct mfma_indexer;

template <>
struct mfma_indexer<mfma_f32_f8_f8<16, 16, 32>> {
    __device__ __forceinline__
    static constexpr std::pair<int, int> item_to_matrix_a(int lane, int item) {
        const int m = lane % 16;
        const int k = 8 * (lane / 16) + item;
        return {m, k};
    }

    __device__ __forceinline__
    static constexpr std::pair<int, int> item_to_matrix_b(int lane, int item) {
        const int n = lane % 16;
        const int k = 8 * (lane / 16) + item;
        return {n, k};
    }

    __device__ __forceinline__
    static constexpr std::pair<int, int> item_to_matrix_c(int lane, int item) {
        const int m = 4 * (lane / 16) + item;
        const int n = lane % 16;
        return {m, n};
    }
};

template <>
struct mfma_indexer<mfma_f32_f8_f8<32, 32, 16>> {
    __device__ __forceinline__
    static constexpr std::pair<int, int> item_to_matrix_a(int lane, int item) {
        const int m = lane % 32;
        const int k = 8 * (lane / 32) + item;
        return {m, k};
    }

    __device__ __forceinline__
    static constexpr std::pair<int, int> item_to_matrix_b(int lane, int item) {
        const int n = lane % 32;
        const int k = 8 * (lane / 32) + item;
        return {n, k};
    }

    __device__ __forceinline__
    static constexpr std::pair<int, int> item_to_matrix_c(int lane, int item) {
        const int n = 8 * (item / 4) % 32 + 4 * (lane / 32) + (item % 4);
        const int m = lane % 32;
        return {n, m};
    }
};

template <
    int block_size,
    cube block_tile,
    cube warp_tile,
    typename load_type,
    bool pipelined_main_loop = false
>
__global__ __launch_bounds__(block_size)
void kernel(
    const fp8* a,
    const fp8* b,
    const fp32* as,
    const fp32* bs,
    bf16* c,
    int m,
    int n,
    int k
) {
    constexpr int warps = block_size / warp_size;

    constexpr int block_tile_m = block_tile.m;
    constexpr int block_tile_n = block_tile.n;
    constexpr int block_tile_k = block_tile.k;

    static_assert(block_tile_m <= 128, "block tile M must be smaller than blockwise block size");
    static_assert(block_tile_n <= 128, "block tile N must be smaller than blockwise block size");
    static_assert(block_tile_k <= 128, "block tile K must be smaller than blockwise block size");

    constexpr int warp_tile_m = warp_tile.m;
    constexpr int warp_tile_n = warp_tile.n;
    constexpr int warp_tile_k = warp_tile.k;

    constexpr int c_total = block_tile_m * block_tile_n;

    static_assert(block_tile_m * block_tile_k % block_size == 0, "size(block_tile_a) has to be divisible by the block size");
    static_assert(block_tile_n * block_tile_k % block_size == 0, "size(block_tile_b) has to be divisible by the block size");
    static_assert(c_total % block_size == 0, "size(block_tile_c) as to be divisible by the block size");

    static_assert(block_tile_m % warp_tile_m == 0, "warp tile M has to divide block tile M");
    static_assert(block_tile_n % warp_tile_n == 0, "warp tile N has to divide block tile N");
    static_assert(block_tile_k % warp_tile_k == 0, "warp tile K has to divide block tile K");

    constexpr int warp_tiles_m = block_tile_m / warp_tile_m;
    constexpr int warp_tiles_n = block_tile_n / warp_tile_n;
    constexpr int warp_tiles_k = block_tile_k / warp_tile_k;

    constexpr int warp_tiles_mn = warp_tiles_m * warp_tiles_n;

    // number of warp tiles has to be divisible by the number of warps
    constexpr int warp_tiles_mn_per_warp = divide_exact<warp_tiles_mn, warps>();

    constexpr int warp_tile_mn_items = warp_tile_m * warp_tile_n;

    using mfma = mfma_f32_f8_f8<warp_tile_m, warp_tile_n, warp_tile_k>;
    using frg_a_type = typename mfma::frg_a_type;
    using frg_b_type = typename mfma::frg_b_type;
    using frg_c_type = typename mfma::frg_c_type;
    using indexer = mfma_indexer<mfma>;

    using block_loader_a = block_loader<block_size, block_tile_m, block_tile_k, load_type>;
    using block_loader_b = block_loader<block_size, block_tile_n, block_tile_k, load_type>;

    constexpr int c_per_thread = c_total / block_size;
    static_assert(c_per_thread == warp_tiles_mn_per_warp * frg_c_type::items_per_thread, "sanity check");

    const int tid = threadIdx.x;

    const int warp = tid / warp_size;
    const int lane = __lane_id();

    // Swap direction to make bounds checking be first
    const int ti_m = gridDim.x - blockIdx.x - 1;
    const int ti_n = gridDim.y - blockIdx.y - 1;

    int sn = ceil_div(n, 128);

    frg_c_type block_c_frg[warp_tiles_mn_per_warp];
    unroll<0, warp_tiles_mn_per_warp>([&]<int i> {
        block_c_frg[i].clear();
    });

    __shared__ fp8 block_tile_a[block_tile_m * (block_tile_k + 4)];
    __shared__ fp8 block_tile_b[block_tile_n * (block_tile_k + 4)];
    __shared__ float block_tile_as[block_size];
    float thread_tile_bs;

    const auto load_input = [&](int i) {
        float frg_as;
        if (tid < 128) {
            frg_as = as[i / 128 * m + ti_m * block_tile_m + tid];
        }
        float frg_bs = bs[i / 128 * sn + ti_n * block_tile_n / 128];
        const auto frg_a = block_loader_a::load_from_global(
            a, m, k, ti_m * block_tile_m, i
        );
        const auto frg_b = block_loader_b::load_from_global(
            b, n, k, ti_n * block_tile_n, i
        );
        return std::make_tuple(frg_a, frg_b, frg_as, frg_bs);
    };

    const auto store_input = [&](int i, const auto& frg_a, const auto& frg_b, const auto& frg_as, const auto& frg_bs) {
        block_loader_a::store_to_smem(block_tile_a, frg_a, m, k, ti_m * block_tile_m, i);
        block_loader_b::store_to_smem(block_tile_b, frg_b, n, k, ti_n * block_tile_n, i);
        block_tile_as[tid] = frg_as;
        thread_tile_bs = frg_bs;
    };

    const auto mma = [&](int i) {
        frg_a_type frg_a[warp_tiles_mn_per_warp * warp_tiles_k];
        unroll1d<warp_tiles_mn_per_warp>([&]<int iwti> {
            const int wti = warp * warp_tiles_mn_per_warp + iwti;
            const int wtm = wti % warp_tiles_m;
            const int wtn = wti / warp_tiles_m;
            unroll<0, block_tile_k, warp_tile_k>([&]<int wtk_base> {
                constexpr int wtk = wtk_base / warp_tile_k;

                unroll<0, frg_a_type::registers_per_thread>([&]<int mk_reg> {
                    const auto [mfma_im, mfma_ik] = indexer::item_to_matrix_a(lane, frg_a_type::first_item_of_reg(mk_reg));
                    const int bim = wtm * warp_tile_m + mfma_im;
                    const int bik = wtk_base + mfma_ik;
                    frg_a[wtk * warp_tiles_mn_per_warp + iwti].regs[mk_reg] =
                        *reinterpret_cast<const uint32_t*>(&block_tile_a[bik + bim * (block_tile_k + 4)]);
                });
            });
        });

        frg_b_type frg_b[warp_tiles_mn_per_warp * warp_tiles_k];
        unroll1d<warp_tiles_mn_per_warp>([&]<int iwti> {
            const int wti = warp * warp_tiles_mn_per_warp + iwti;
            const int wtm = wti % warp_tiles_m;
            const int wtn = wti / warp_tiles_m;
            unroll<0, block_tile_k, warp_tile_k>([&]<int wtk_base> {
                constexpr int wtk = wtk_base / warp_tile_k;

                unroll<0, frg_b_type::registers_per_thread>([&]<int nk_reg> {
                    const auto [mfma_in, mfma_ik] = indexer::item_to_matrix_b(lane, frg_b_type::first_item_of_reg(nk_reg));
                    const int bin = wtn * warp_tile_n + mfma_in;
                    const int bik = wtk_base + mfma_ik;
                    frg_b[wtk * warp_tiles_mn_per_warp + iwti].regs[nk_reg] =
                        *reinterpret_cast<const uint32_t*>(&block_tile_b[bik + bin * (block_tile_k + 4)]);
                });
            });
        });

        frg_c_type warp_frg_c[warp_tiles_mn_per_warp];
        unroll<0, warp_tiles_mn_per_warp>([&]<int i> {
            warp_frg_c[i].clear();
        });

        unroll2d<warp_tiles_mn_per_warp, warp_tiles_k>([&]<int iwti, int wtk> {
            mfma::execute(
                warp_frg_c[iwti],
                frg_a[wtk * warp_tiles_mn_per_warp + iwti],
                frg_b[wtk * warp_tiles_mn_per_warp + iwti]
            );
        });

        unroll2d<warp_tiles_mn_per_warp, frg_c_type::items_per_thread>([&]<int iwti, int mn_item> {
            const int wti = warp * warp_tiles_mn_per_warp + iwti;
            const int wtm = wti % warp_tiles_m;

            const auto [mfma_im, mfma_in] = indexer::item_to_matrix_c(lane, mn_item);
            const int bim = wtm * warp_tile_m + mfma_im;

            block_c_frg[iwti].thread_values()[mn_item] += warp_frg_c[iwti].thread_values()[mn_item]
                * block_tile_as[bim]
                * thread_tile_bs;
        });
    };

    if constexpr (!pipelined_main_loop) {
        // Regular main loop
        for (int i = 0; i < k; i += block_tile_k) {
            const auto [frg_a, frg_b, frg_as, frg_bs] = load_input(i);
            store_input(i, frg_a, frg_b, frg_as, frg_bs);
            __syncthreads();
            mma(i);
            __syncthreads();
        }
    } else {
        // Pipelined main loop
        int i = 0;
        auto [frg_a, frg_b, frg_as, frg_bs] = load_input(i);
        store_input(i, frg_a, frg_b, frg_as, frg_bs);
        __syncthreads();

        for (; i + block_tile_k < k; i += block_tile_k) {
            std::tie(frg_a, frg_b, frg_as, frg_bs) = load_input(i + block_tile_k);
            __builtin_amdgcn_sched_barrier(0);
            mma(i);
            __syncthreads();
            store_input(i + block_tile_k, frg_a, frg_b, frg_as, frg_bs);
            __syncthreads();
        }
        mma(i);
    }

    // Write out C
    // This should access tile C in the same order as in the matmul loop!

    const int im_base = ti_m * block_tile_m;
    const int in_base = ti_n * block_tile_n;

    const bool c_in_bounds =
        (m % block_tile_m == 0 || im_base + block_tile_m <= m) &&
        (n % block_tile_n == 0 || in_base + block_tile_n <= n);

    select(c_in_bounds, [&]<bool c_in_bounds> {
        unroll2d<warp_tiles_mn_per_warp, frg_c_type::items_per_thread>([&]<int iwti, int mn_item> {
            const auto [mfma_im, mfma_in] = indexer::item_to_matrix_c(lane, mn_item);

            const int wti = warp * warp_tiles_mn_per_warp + iwti;
            const int wtm = wti % warp_tiles_m;
            const int wtn = wti / warp_tiles_m;

            const int bim = wtm * warp_tile_m + mfma_im;
            const int bin = wtn * warp_tile_n + mfma_in;

            const int im = im_base + bim;
            const int in = in_base + bin;

            const auto val = bf16_from_fp32(block_c_frg[iwti].thread_values()[mn_item]);

            if (c_in_bounds || im < m && in < n) {
                __builtin_nontemporal_store(std::bit_cast<uint16_t>(val), reinterpret_cast<uint16_t*>(&c[im * n + in]));
            }
        });
    });
}

template<
    int block_size,
    cube block_tile,
    cube warp_tile,
    bool pipelined_main_loop = false,
    typename load_type = __uint128_t
>
void run_kernel(
    const fp8* a,
    const fp8* b,
    const fp32* as,
    const fp32* bs,
    bf16* c,
    int m,
    int n,
    int k,
    bool measure
) {
    const int grid_m = ceil_div(m, block_tile.m);
    const int grid_n = ceil_div(n, block_tile.n);

    hipEvent_t start, stop;
    if (measure) {
        HIP_CHECK(hipEventCreate(&start));
        HIP_CHECK(hipEventCreate(&stop));
        HIP_CHECK(hipEventRecord(start, 0));
    }

    kernel<
        block_size,
        block_tile,
        warp_tile,
        load_type,
        pipelined_main_loop
    ><<<
        dim3(grid_m, grid_n),
        dim3(block_size),
        0
    >>>(
        a,
        b,
        as,
        bs,
        c,
        m,
        n,
        k
    );

    HIP_CHECK(hipGetLastError());

    if (measure) {
        HIP_CHECK(hipEventRecord(stop, 0));
        HIP_CHECK(hipDeviceSynchronize());
        HIP_CHECK(hipEventSynchronize(stop));

        float ms = 0;
        HIP_CHECK(hipEventElapsedTime(&ms, start, stop));
        const double time = ms / 1'000.0;

        const double memory = m * k * sizeof(fp8) + n * k * sizeof(fp8) + m * n * sizeof(bf16);
        const double ops =
            double(m) * n * k * 2 // Multiply + add for each pair
            + (double(m) * n * 2) * ceil_div(k, warp_tile.k); // scaling

        const double memory_tput = memory / time / (1000.0 * 1000 * 1000);
        const double compute_tput = ops / time / (1000.0 * 1000 * 1000 * 1000);

        std::cerr
            << std::fixed
            << std::setprecision(2)
            << "(" << m << " " << n << " " << k << ") "
            << "(" << block_tile.m << " " << block_tile.n << " " << block_tile.k << ") "
            << "(" << warp_tile.m << " " << warp_tile.n << " " << warp_tile.k << ") "
            << pipelined_main_loop << " "
            << block_size << ": "
            << ms << " ms "
            << (time * 1'000'000) << " us "
            << memory_tput << " GB/s "
            << compute_tput << " TFLOPS"
            << std::endl;

        HIP_CHECK(hipEventDestroy(start));
        HIP_CHECK(hipEventDestroy(stop));
    }
}

void run(
    uintptr_t a_ptr,
    uintptr_t b_ptr,
    uintptr_t as_ptr,
    uintptr_t bs_ptr,
    uintptr_t c_ptr,
    int m,
    int n,
    int k,
    bool measure
) {
    // In the kernels we assume 128-bit alignment.
    assert(a_ptr % 16 == 0);
    assert(b_ptr % 16 == 0);
    assert(as_ptr % 16 == 0);
    assert(bs_ptr % 16 == 0);
    assert(c_ptr % 16 == 0);

    const auto* a = reinterpret_cast<const fp8*>(a_ptr);
    const auto* b = reinterpret_cast<const fp8*>(b_ptr);
    const auto* as = reinterpret_cast<const fp32*>(as_ptr);
    const auto* bs = reinterpret_cast<const fp32*>(bs_ptr);
    auto* c = reinterpret_cast<bf16*>(c_ptr);

    // run_kernel<256, cube{64, 64, 128}, cube{32, 32, 16}, false>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{128, 64, 128}, cube{32, 32, 16}, true>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{128, 64, 128}, cube{32, 32, 16}, true>(a, b, as, bs, c, m, n, k, measure);

    // run_kernel<256, cube{128, 128, 64}, cube{16, 16, 32}, false>(a, b, as, bs, c, m, n, k, measure);
}

PYBIND11_MODULE(fp8, m) {
  m.def("fp8", &run, "HIP kernel");
}
"""

hip_module = load_inline(
    name="fp8",
    cpp_sources="",
    cuda_sources=kernel_cpp.replace('@', chr(92)),
    with_cuda=True,
    verbose=False,
    extra_cuda_cflags=(["-save-temps"] if TESTING is not None else []) + ["-std=c++20"],
    build_directory="/workspace/build/" if TESTING == "vscode" else "/gpumode/amd/fp8/build/" if TESTING is not None else None,
    no_implicit_headers=True,
)

first = True

cache_m = 0
cache_n = 0
cache_k = 0
cache_i = 0

def custom_kernel(data: input_t) -> output_t:
    """
    Reference implementation of block-scale fp8 gemm
    Args:
        data: Tuple that expands to:
            a: torch.Tensor[float8_e4m3fnuz] of shape [m, k],
            b: torch.Tensor[float8_e4m3fnuz] of shape [n, k],
            a_scale: torch.Tensor[float32] of shape [m, k // 128],
            b_scale: torch.Tensor[float32] of shape [n // 128, k // 128],
            c: torch.Tensor[bfloat16] of shape [m, n]
    Returns:
        Tensor containing output in bf16
    """

    global first
    if first:
        print("executing on", torch.cuda.get_device_name(), file=sys.stderr)
        first = False

    a, b, a_scale, b_scale, c = data

    m, n = c.shape
    k = a.shape[1]

    global cache_m
    global cache_n
    global cache_k
    global cache_i

    if cache_m != m or cache_n != n or cache_k != k:
        cache_m = m
        cache_n = n
        cache_k = k
        cache_i = 0
    else:
        cache_i += 1

    # Don't check the performance on the first iteration to allow for some warmup
    measure = False
    if cache_i == 1:
        measure = False

    hip_module.fp8(
        a.data_ptr(),
        b.data_ptr(),
        a_scale.data_ptr(),
        b_scale.data_ptr(),
        c.data_ptr(),
        m,
        n,
        k,
        measure
    )

    return c


Source code from GPU Mode and the KernelBot dataset · June 9 Researcher Reciprocity License v1.0

Changes from previous submission

Against this author's previous submission submission 9306.

- #!POPCORN leaderboard amd-fp8-mm
#!POPCORN gpu MI300
from task import input_t, output_t
import torch
from torch.utils.cpp_extension import load_inline
import time
import os
import sys

if "PYTORCH_ROCM_ARCH" not in os.environ:
    os.environ["PYTORCH_ROCM_ARCH"] = "gfx942:xnack-"

TESTING = os.environ.get("GPUMODE_TESTING", None)

kernel_cpp = r"""
#include <hip/hip_runtime.h>
#include <hip/hip_fp16.h>
#include <hip/hip_bf16.h>
#include <hip/hip_fp8.h>
#include <pybind11/pybind11.h>
#include <iostream>
#include <iomanip>
#include <bit>

#define HIP_CHECK(condition)                                                                  @
    do                                                                                        @
    {                                                                                         @
        hipError_t error = condition;                                                         @
        if(error != hipSuccess)                                                               @
        {                                                                                     @
            std::cerr << "Error " << hipGetErrorName(error) << '(' << error << ')' << ": "    @
                      << hipGetErrorString(error) << " in " << __func__ << " at " << __FILE__ @
                      << ':' << __LINE__ << '@n';                                             @
            exit(error);                                                                      @
        }                                                                                     @
    }                                                                                         @
    while(false)

using fp8 = __hip_fp8_e4m3_fnuz;
using bf16 = __hip_bfloat16;
using fp32 = float;
using fp32x4 = fp32 __attribute__((ext_vector_type(4)));
using fp32x16 = fp32 __attribute__((ext_vector_type(16)));

struct cube {
    int m, n, k;
};

constexpr int warp_size = 64;
constexpr int cache_line_size = 128;

constexpr int m_block_size_multiple = 32;
constexpr int n_block_size_multiple = 32;
constexpr int k_block_size_multiple = 128;

using register_type = uint32_t;

template <typename T, typename U>
__host__ __device__
constexpr auto ceil_div(T a, U b) {
    return (a + b - 1) / b;
}

template<auto a, auto b>
__host__ __device__
constexpr auto divide_exact() {
    static_assert(a % b == 0, "does not divide exact!");
    return a / b;
}

template<int I, int N, int inc = 1, typename F>
__device__ __forceinline__
void unroll(F f) {
    if constexpr (I < N) {
        f.template operator()<I>();
        unroll<I + inc, N, inc>(f);
    }
}

template<int I, typename F>
__device__ __forceinline__
void unroll1d(F f) {
    unroll<0, I>(f);
}

template<int I, int J, typename F>
__device__ __forceinline__
void unroll2d(F f) {
    unroll<0, I>([&]<int i> {
        unroll<0, J>([&]<int j> {
            f.template operator()<i, j>();
        });
    });
}

template<int I, int J, int K, typename F>
__device__ __forceinline__
void unroll3d(F f) {
    unroll<0, I>([&]<int i> {
        unroll<0, J>([&]<int j> {
            unroll<0, K>([&]<int k> {
                f.template operator()<i, j, k>();
            });
        });
    });
}

template <typename T, size_t N>
__device__
void clear(T (&array)[N]) {
    unroll<0, N>([&]<int i> {
        array[i] = T{0};
    });
}

__device__
bf16 bf16_from_fp32(float x) {
    // HIP's conversion function does all kinds of checks
    // for odd cases (NaN, subnormals) that we don't care about.
    // This generates absolutely abysmal code, so just truncate
    // the upper bits to get the right value like the
    // Opperpython intended.

    return std::bit_cast<bf16>(
        static_cast<uint16_t>(
            std::bit_cast<uint32_t>(x) >> 16
        )
    );
}

__device__
fp32 fp32_from_fp8(fp8 x) {
    // HIP's conversion from fp8 to fp32 is slow on anything that
    // doesn't have the hardware instructions to do it. The software
    // method deals with special cases (NaN, subnormals), but we
    // don't care about that here since we don't expect those in
    // the input. Therefore, we can optimize the software implementation
    // by just shuffling the bits.
#ifdef __gfx942__
    // MI300 has an instruction for this.
    return float(x);
#else
    // Fallback case
    // TODO: Find a faster option
    return float(x);
#endif
}

template <typename F>
__device__ __host__
void select(bool cond, F f) {
    if (cond) {
        f.template operator()<true>();
    } else {
        f.template operator()<false>();
    }
}

template<int lane_stride>
__device__
uint32_t transpose_4x4_f8_v2(uint32_t input) {
    static_assert(lane_stride < warp_size / 4, "lane stride is too large");
    static_assert((lane_stride & (lane_stride - 1)) == 0, "line stride has to be a power of 2");
    // input:
    // byte 0 1 2 3
    //      0 1 2 3 lane X
    //      4 5 6 7 lane X+lane_stride
    //      8 9 A B lane X+lane_stride
    //      C D E F lane X+lane_stride
    // swap pairs of lanes to get
    // 0 1 2 3
    // 4 5 6 7
    // C D E F
    // 8 9 A B
    // then use byteperm to swap pairs horizontally + merge the
    // two results to get 2x2 transposed
    // 0 4 2 6
    // 1 5 3 7
    // 8 C A E
    // 9 D B F
    const auto lane = __lane_id();
    const auto group_lane_index = lane / lane_stride % 4;
    const auto t2x2 = __builtin_amdgcn_perm(
        __shfl_xor(input, lane_stride), // Swap pairs
        input,
        group_lane_index % 2 == 0
            ? 0x06'02'04'00
            : 0x03'07'01'05
    );
    // Now swap groups of 2 horizontally, and do the
    // same byteperm operation except with groups of 2x2.
    // 0 0 1 1     0 0 2 2
    // 0 0 1 1 --> 0 0 2 2
    // 2 2 3 3     1 1 3 3
    // 2 2 3 3     1 1 3 3
    const auto t4x4 = __builtin_amdgcn_perm(
        __shfl_xor(t2x2, lane_stride * 2), // Swap groups
        t2x2,
        group_lane_index < 2
            ? 0x05'04'01'00
            : 0x03'02'07'06
    );

    // input = (lane << 24) | (lane << 16) | (lane << 8) | lane;
    return t4x4;
}
template<
    int block_size,
    int block_tile_m,
    int block_tile_n,
    typename load_type,
    bool m_aligned = false,
    bool n_aligned = false
>
__device__
__forceinline__
auto block_tile_load_fast_linear(
    // Global memory source
    const fp8* block_tile_src,
    int m,
    int n,
    int block_off_m,
    int block_off_n
) {
    block_tile_src += block_off_n * m + block_off_m;

    const bool completely_in_bounds = (m_aligned && n_aligned) ||
        (block_off_m + block_tile_m <= m &&
        block_off_n + block_tile_n <= n);

    // A general fast global memory needs to be as follows:
    // - Group of 16 bytes so that we can use a 128-bit load
    // - The fast path requires entire cache lines to be loaded at once. CDNA3
    //   cache line size is 128 bytes, so the ideal matrix size has an inner
    //   dimension (block_tile_m; source is column major) of at least 128.
    // - We want every thread to participate, so we need at least
    //   block_size / (128 / 16) elements in the N direction.
    //   block_size == 64 => 8
    //   block_size == 256 => 32
    //   block_size == 1024 => 128
    // - We assume that the input is already aligned to 128 bits, and that the m stride
    //   is also aligned such. m, n, k are all divisible by 64, so this should be fine.
    //
    //   ┌───┬───┬───┬───┐ ┌───┐
    //   │0  │4  │8  │12 │ │   │ = 16 bytes
    //   ├───┼───┼───┼───┤ └───┘
    //   │1  │5  │9  │13 │
    //   ├───┼───┼───┼───┤
    //   │2  │6  │10 │14 │
    //   ├───┼───┼───┼───┤
    //   │3  │7  │11 │15 │
    //   └───┴───┴───┴───┘

    // using load_type = uint32_t;

    // static_assert(block_tile_m % cache_line_size == 0, "tile inner dimension should be divisible by cache line size");

    static_assert(block_tile_m % sizeof(load_type) == 0, "tile inner dimension has to be divisible by load type size");
    constexpr int total_loads = block_tile_m * block_tile_n / sizeof(load_type);
    static_assert(total_loads % block_size == 0, "total amount of loads needs to be divisible by the block size");
    constexpr int loads_per_block_tile_m = block_tile_m / sizeof(load_type);
    constexpr int loads_per_thread = total_loads / block_size;

    const int tid = threadIdx.x;

    std::array<load_type, loads_per_thread> result;

    select(completely_in_bounds, [&]<bool in_bounds> {
        unroll<0, loads_per_thread>([&]<int j> {
            const int i = j * block_size + tid;
            const int row = i % loads_per_block_tile_m;
            const int col = i / loads_per_block_tile_m;

            const int src_off = row * sizeof(load_type) + col * m;
            const int src_row = row * sizeof(load_type) + block_off_m;
            const int src_col = col + block_off_n;

            // Note: M, N, K is guaranteed to be divisible by the load
            // size, so we only need to check the outer bounds.
            // load_type src_packed;
            if (in_bounds || ((m_aligned || src_row < m) && (n_aligned || src_col < n))) {
                result[j] = *reinterpret_cast<const load_type*>(block_tile_src + src_off);
            } else {
                result[j] = 0;
            }

            // // const int dst_off = row * sizeof(load_type) + col * block_tile_m;
            // auto* dst = reinterpret_cast<uint8_t*>(block_tile_dst);
            // const auto* src = reinterpret_cast<const uint8_t*>(&src_packed);

            // // Store transposed
            // unroll<0, sizeof(load_type)>([&]<int k> {
            //     const int dst_row = row * sizeof(load_type) + k;
            //     const int dst_col = col;
            //     dst[dst_col + dst_row * (block_tile_n + 4)] = src[k];
            // });

            // Store transposed using 4x4 groups.
            // constexpr int lane_stride = loads_per_block_tile_m;
            // unroll<0, sizeof(load_type), sizeof(uint32_t)>([&]<int k> {
            //     const int dst_row = row * sizeof(load_type) + k;
            //     const int dst_col = col;
            //     auto v = *reinterpret_cast<const uint32_t*>(&src[k]);
            //     v = transpose_4x4_f8_v2<lane_stride>(v);
            //     const auto group_lane_index = __lane_id() / lane_stride % 4;
            //     *reinterpret_cast<uint32_t*>(&dst[(dst_col - dst_col % 4) + (dst_row + group_lane_index) * (block_tile_n + 4)])
            //         = v;
            // });
        });
    });

    return result;
}

template<
    int block_size,
    int block_tile_m,
    int block_tile_n,
    typename load_type
>
__device__
void write_to_smem(
    fp8* block_tile_dst,
    const load_type* thread_src
) {
    static_assert(block_tile_m % sizeof(load_type) == 0, "tile inner dimension has to be divisible by load type size");
    constexpr int total_loads = block_tile_m * block_tile_n / sizeof(load_type);
    static_assert(total_loads % block_size == 0, "total amount of loads needs to be divisible by the block size");
    constexpr int loads_per_block_tile_m = block_tile_m / sizeof(load_type);
    constexpr int loads_per_thread = total_loads / block_size;

    const int tid = threadIdx.x;

    unroll<0, loads_per_thread>([&]<int j> {
        const int i = j * block_size + tid;
        const int row = i % loads_per_block_tile_m;
        const int col = i / loads_per_block_tile_m;

        auto* dst = reinterpret_cast<uint8_t*>(block_tile_dst);
        const auto* src = reinterpret_cast<const uint8_t*>(&thread_src[j]);

        // Store transposed
        //unroll<0, sizeof(load_type)>([&]<int k> {
        //    const int dst_row = row * sizeof(load_type) + k;
        //    const int dst_col = col;
        //    dst[dst_col + dst_row * (block_tile_n + 4)] = src[k];
        //});

        // Store transposed using 4x4 groups.
        constexpr int lane_stride = loads_per_block_tile_m;
        unroll<0, sizeof(load_type), sizeof(uint32_t)>([&]<int k> {
            const int dst_row = row * sizeof(load_type) + k;
            const int dst_col = col;
            auto v = *reinterpret_cast<const uint32_t*>(&src[k]);
            v = transpose_4x4_f8_v2<lane_stride>(v);
            const auto group_lane_index = __lane_id() / lane_stride % 4;
            *reinterpret_cast<uint32_t*>(&dst[(dst_col - dst_col % 4) + (dst_row + group_lane_index) * (block_tile_n + 4)])
                = v;
        });
    });
}

template <int warp_tile_m_, int warp_tile_n_, typename T>
struct mfma_fragment {
    using type = T;

    constexpr static const int warp_tile_m = warp_tile_m_;
    constexpr static const int warp_tile_n = warp_tile_n_;

    constexpr static const int total_items = warp_tile_m * warp_tile_n;

    constexpr static const int items_per_thread = divide_exact<total_items, warp_size>();
    constexpr static const int registers_per_thread = divide_exact<items_per_thread * sizeof(T), sizeof(register_type)>();

    register_type regs[registers_per_thread];

    __device__
    constexpr static mfma_fragment zero() {
        return mfma_fragment{{}};
    }

    __device__
    std::array<T, items_per_thread>& thread_values() {
        return *reinterpret_cast<std::array<T, items_per_thread>*>(&this->regs);
    }

    __device__
    const std::array<T, items_per_thread>& thread_values() const {
        return *reinterpret_cast<const std::array<T, items_per_thread>*>(&this->regs);
    }

    __device__
    void clear() {
        unroll<0, registers_per_thread>([&]<int i> {
            this->regs[i] = 0;
        });
    }

    static constexpr int first_item_of_reg(int reg) {
        return reg * sizeof(register_type);
    }
};

template <int m, int n, int k>
struct mfma_f32_f32_f32;

template <>
struct mfma_f32_f32_f32<16, 16, 4> {
    using frg_a_type = mfma_fragment<16, 4, float>;
    using frg_b_type = mfma_fragment<16, 4, float>;
    using frg_c_type = mfma_fragment<16, 16, float>;

    __device__
    static void execute(
        frg_c_type& c,
        const frg_a_type& a,
        const frg_b_type& b
    ) {
        c = std::bit_cast<frg_c_type>(
            __builtin_amdgcn_mfma_f32_16x16x4f32(
                std::bit_cast<float>(a),
                std::bit_cast<float>(b),
                std::bit_cast<fp32x4>(c),
                0,
                0,
                0
            )
        );
    }
};

template <>
struct mfma_f32_f32_f32<32, 32, 2> {
    using frg_a_type = mfma_fragment<32, 2, float>;
    using frg_b_type = mfma_fragment<32, 2, float>;
    using frg_c_type = mfma_fragment<32, 32, float>;

    __device__
    static void execute(
        frg_c_type& c,
        const frg_a_type& a,
        const frg_b_type& b
    ) {
        c = std::bit_cast<frg_c_type>(
            __builtin_amdgcn_mfma_f32_32x32x2f32(
                std::bit_cast<float>(a),
                std::bit_cast<float>(b),
                std::bit_cast<fp32x16>(c),
                0,
                0,
                0
            )
        );
    }
};

template <int m, int n, int k>
struct mfma_f32_f8_f8;

template <>
struct mfma_f32_f8_f8<16, 16, 32> {
    using frg_a_type = mfma_fragment<16, 32, fp8>;
    using frg_b_type = mfma_fragment<16, 32, fp8>;
    using frg_c_type = mfma_fragment<16, 16, float>;

    __device__
    static void execute(
        frg_c_type& c,
        const frg_a_type& a,
        const frg_b_type& b
    ) {
#ifdef __HIP_DEVICE_COMPILE__
#ifdef __gfx942__
    c = std::bit_cast<frg_c_type>(
        __builtin_amdgcn_mfma_f32_16x16x32_fp8_fp8(
            std::bit_cast<uint64_t>(a),
            std::bit_cast<uint64_t>(b),
            std::bit_cast<fp32x4>(c),
            0,
            0,
            0
        )
    );
#else
    // Fallback copied from CK, this way we can test on MI210.
    using fallback_mfma = mfma_f32_f32_f32<16, 16, 4>;
    const auto& a_values = a.thread_values();
    const auto& b_values = b.thread_values();
    unroll<0, frg_a_type::items_per_thread>([&]<int k> {
        const auto fallback_a = std::bit_cast<fallback_mfma::frg_a_type>(static_cast<float>(a_values[k]));
        const auto fallback_b = std::bit_cast<fallback_mfma::frg_b_type>(static_cast<float>(b_values[k]));
        fallback_mfma::execute(c, fallback_a, fallback_b);
    });
#endif
#endif
    }
};

template<>
struct mfma_f32_f8_f8<32, 32, 16> {
    using frg_a_type = mfma_fragment<32, 16, fp8>;
    using frg_b_type = mfma_fragment<32, 16, fp8>;
    using frg_c_type = mfma_fragment<32, 32, float>;

    __device__
    static void execute(
        frg_c_type& c,
        const frg_a_type& a,
        const frg_b_type& b
    ) {
#ifdef __HIP_DEVICE_COMPILE__
#ifdef __gfx942__
    c = std::bit_cast<frg_c_type>(
        __builtin_amdgcn_mfma_f32_32x32x16_fp8_fp8(
            std::bit_cast<uint64_t>(a),
            std::bit_cast<uint64_t>(b),
            std::bit_cast<fp32x16>(c),
            0,
            0,
            0
        )
    );
#else
    // Fallback copied from CK, this way we can test on MI210.
    using fallback_mfma = mfma_f32_f32_f32<32, 32, 2>;
    const auto& a_values = a.thread_values();
    const auto& b_values = b.thread_values();
    unroll<0, frg_a_type::items_per_thread>([&]<int k> {
        const auto fallback_a = std::bit_cast<fallback_mfma::frg_a_type>(static_cast<float>(a_values[k]));
        const auto fallback_b = std::bit_cast<fallback_mfma::frg_b_type>(static_cast<float>(b_values[k]));
        fallback_mfma::execute(c, fallback_a, fallback_b);
    });
#endif
#endif
    }
};

// See CDNA3 manual, 7.1.4.1. Input layout
// The calculations here are obtained via the
// AMD matrix instruction calculator
// https://github.com/ROCm/amd_matrix_instruction_calculator
// There is a cleaner way to compute the mapping, but
// this is what the tool returns and I'm lazy. We only
// really need these two anyway for now.
template <typename mfma>
struct mfma_indexer;

template <>
struct mfma_indexer<mfma_f32_f8_f8<16, 16, 32>> {
    __device__
    static constexpr std::pair<int, int> item_to_matrix_a(int lane, int item) {
        const int m = lane % 16;
        const int k = 8 * (lane / 16) + item;
        return {m, k};
    }

    __device__
    static constexpr std::pair<int, int> item_to_matrix_b(int lane, int item) {
        const int n = lane % 16;
        const int k = 8 * (lane / 16) + item;
        return {n, k};
    }

    __device__
    static constexpr std::pair<int, int> item_to_matrix_c(int lane, int item) {
        const int m = 4 * (lane / 16) + item;
        const int n = lane % 16;
        return {m, n};
    }
};

template <>
struct mfma_indexer<mfma_f32_f8_f8<32, 32, 16>> {
    __device__
    static constexpr std::pair<int, int> item_to_matrix_a(int lane, int item) {
        const int m = lane % 32;
        const int k = 8 * (lane / 32) + item;
        return {m, k};
    }

    __device__
    static constexpr std::pair<int, int> item_to_matrix_b(int lane, int item) {
        const int n = lane % 32;
        const int k = 8 * (lane / 32) + item;
        return {n, k};
    }

    __device__
    static constexpr std::pair<int, int> item_to_matrix_c(int lane, int item) {
        const int n = 8 * (item / 4) % 32 + 4 * (lane / 32) + (item % 4);
        const int m = lane % 32;
        return {n, m};
    }
};

template <
    int block_size,
    cube block_tile,
    cube warp_tile,
    typename load_type,
    bool pipelined_main_loop = false,
    bool m_aligned = false,
    bool n_aligned = false,
    bool k_aligned = false
>
__global__ __launch_bounds__(block_size)
void kernel(
    const fp8* a,
    const fp8* b,
    const fp32* as,
    const fp32* bs,
    bf16* c,
    int m,
    int n,
    int k
) {
    constexpr int warps = block_size / warp_size;

    constexpr int block_tile_m = block_tile.m;
    constexpr int block_tile_n = block_tile.n;
    constexpr int block_tile_k = block_tile.k;

    static_assert(block_tile_m <= 128, "block tile M must be smaller than blockwise block size");
    static_assert(block_tile_n <= 128, "block tile N must be smaller than blockwise block size");
    static_assert(block_tile_k <= 128, "block tile K must be smaller than blockwise block size");

    constexpr int warp_tile_m = warp_tile.m;
    constexpr int warp_tile_n = warp_tile.n;
    constexpr int warp_tile_k = warp_tile.k;

    using mfma = mfma_f32_f8_f8<warp_tile_m, warp_tile_n, warp_tile_k>;
    using frg_a_type = typename mfma::frg_a_type;
    using frg_b_type = typename mfma::frg_b_type;
    using frg_c_type = typename mfma::frg_c_type;
    using indexer = mfma_indexer<mfma>;

    constexpr int c_total = block_tile_m * block_tile_n;

    static_assert(block_tile_m * block_tile_k % block_size == 0, "size(block_tile_a) has to be divisible by the block size");
    static_assert(block_tile_n * block_tile_k % block_size == 0, "size(block_tile_b) has to be divisible by the block size");
    static_assert(c_total % block_size == 0, "size(block_tile_c) as to be divisible by the block size");

    static_assert(block_tile_m % warp_tile_m == 0, "warp tile M has to divide block tile M");
    static_assert(block_tile_n % warp_tile_n == 0, "warp tile N has to divide block tile N");
    static_assert(block_tile_k % warp_tile_k == 0, "warp tile K has to divide block tile K");

    constexpr int warp_tiles_m = block_tile_m / warp_tile_m;
    constexpr int warp_tiles_n = block_tile_n / warp_tile_n;
    constexpr int warp_tiles_k = block_tile_k / warp_tile_k;

    constexpr int warp_tiles_mn = warp_tiles_m * warp_tiles_n;

    // number of warp tiles has to be divisible by the number of warps
    constexpr int warp_tiles_mn_per_warp = divide_exact<warp_tiles_mn, warps>();

    constexpr int warp_tile_mn_items = warp_tile_m * warp_tile_n;

    constexpr int c_per_thread = c_total / block_size;
    static_assert(c_per_thread == warp_tiles_mn_per_warp * frg_c_type::items_per_thread, "sanity check");

    const int tid = threadIdx.x;

    const int warp = tid / warp_size;
    const int lane = __lane_id();

    // Swap direction to make bounds checking be first
    const int ti_m = gridDim.x - blockIdx.x - 1;
    const int ti_n = gridDim.y - blockIdx.y - 1;

    int sn = ceil_div(n, 128);

    frg_c_type block_c_frg[warp_tiles_mn_per_warp];
    unroll<0, warp_tiles_mn_per_warp>([&]<int i> {
        block_c_frg[i].clear();
    });

    __shared__ fp8 block_tile_a[block_tile_m * (block_tile_k + 4)];
    __shared__ fp8 block_tile_b[block_tile_n * (block_tile_k + 4)];

    const auto load_input = [&]<bool check_bounds_k>(int i) {
        const auto regs_a = block_tile_load_fast_linear<
            block_size,
            block_tile_m,
            block_tile_k,
            load_type,
            m_aligned,
            k_aligned && !check_bounds_k
        >(
            a, m, k, ti_m * block_tile_m, i
        );
        const auto regs_b = block_tile_load_fast_linear<
            block_size,
            block_tile_n,
            block_tile_k,
            load_type,
            n_aligned,
            k_aligned && !check_bounds_k
        >(
            b, n, k, ti_n * block_tile_n, i
        );
        return std::make_pair(regs_a, regs_b);
    };

    const auto mma = [&](int i) {
        frg_a_type frg_a[warp_tiles_mn_per_warp * warp_tiles_k];
        unroll1d<warp_tiles_mn_per_warp>([&]<int iwti> {
            const int wti = warp * warp_tiles_mn_per_warp + iwti;
            const int wtm = wti % warp_tiles_m;
            const int wtn = wti / warp_tiles_m;
            unroll<0, block_tile_k, warp_tile_k>([&]<int wtk_base> {
                constexpr int wtk = wtk_base / warp_tile_k;

                unroll<0, frg_a_type::registers_per_thread>([&]<int mk_reg> {
                    const auto [mfma_im, mfma_ik] = indexer::item_to_matrix_a(lane, frg_a_type::first_item_of_reg(mk_reg));
                    const int bim = wtm * warp_tile_m + mfma_im;
                    const int bik = wtk_base + mfma_ik;
                    frg_a[wtk * warp_tiles_mn_per_warp + iwti].regs[mk_reg] =
                        *reinterpret_cast<const uint32_t*>(&block_tile_a[bik + bim * (block_tile_k + 4)]);
                });
            });
        });

        frg_b_type frg_b[warp_tiles_mn_per_warp * warp_tiles_k];
        unroll1d<warp_tiles_mn_per_warp>([&]<int iwti> {
            const int wti = warp * warp_tiles_mn_per_warp + iwti;
            const int wtm = wti % warp_tiles_m;
            const int wtn = wti / warp_tiles_m;
            unroll<0, block_tile_k, warp_tile_k>([&]<int wtk_base> {
                constexpr int wtk = wtk_base / warp_tile_k;

                unroll<0, frg_b_type::registers_per_thread>([&]<int nk_reg> {
                    const auto [mfma_in, mfma_ik] = indexer::item_to_matrix_b(lane, frg_b_type::first_item_of_reg(nk_reg));
                    const int bin = wtn * warp_tile_n + mfma_in;
                    const int bik = wtk_base + mfma_ik;
                    frg_b[wtk * warp_tiles_mn_per_warp + iwti].regs[nk_reg] =
                        *reinterpret_cast<const uint32_t*>(&block_tile_b[bik + bin * (block_tile_k + 4)]);
                });
            });
        });

        frg_c_type warp_frg_c[warp_tiles_mn_per_warp];
        unroll<0, warp_tiles_mn_per_warp>([&]<int i> {
            warp_frg_c[i].clear();
        });

        unroll2d<warp_tiles_mn_per_warp, warp_tiles_k>([&]<int iwti, int wtk> {
            mfma::execute(
                warp_frg_c[iwti],
                frg_a[wtk * warp_tiles_mn_per_warp + iwti],
                frg_b[wtk * warp_tiles_mn_per_warp + iwti]
            );
        });

        unroll2d<warp_tiles_mn_per_warp, frg_c_type::items_per_thread>([&]<int iwti, int mn_item> {
            const int wti = warp * warp_tiles_mn_per_warp + iwti;
            const int wtm = wti % warp_tiles_m;

            const auto [mfma_im, mfma_in] = indexer::item_to_matrix_c(lane, mn_item);
            const int bim = wtm * warp_tile_m + mfma_im;
            const int im = ti_m * block_tile_m + bim;
            const int in = ti_n * block_tile_n; // tile offset doesn't matter here, omitting it helps the optimizer.

            block_c_frg[iwti].thread_values()[mn_item] += warp_frg_c[iwti].thread_values()[mn_item]
                * as[i / 128 * m + im]
                * bs[i / 128 * sn + in / 128];
        });
    };

    if constexpr (!pipelined_main_loop) {
        // Regular main loop
        for (int i = 0; i < k; i += block_tile_k) {
            const auto [regs_a, regs_b] = load_input.template operator()<true>(i);
            write_to_smem<block_size, block_tile_m, block_tile_k, load_type>(block_tile_a, regs_a.data());
            write_to_smem<block_size, block_tile_n, block_tile_k, load_type>(block_tile_b, regs_b.data());
            __syncthreads();
            mma(i);
            __syncthreads();
        }
    } else {
        // Pipelined main loop
        int i = 0;
        auto [regs_a, regs_b] = load_input.template operator()<true>(i);
        write_to_smem<block_size, block_tile_m, block_tile_k, load_type>(block_tile_a, regs_a.data());
        write_to_smem<block_size, block_tile_n, block_tile_k, load_type>(block_tile_b, regs_b.data());
        __syncthreads();

        for (; i + block_tile_k < k; i += block_tile_k) {
            std::tie(regs_a, regs_b) = load_input.template operator()<true>(i + block_tile_k);
            mma(i);
            __syncthreads();
            write_to_smem<block_size, block_tile_m, block_tile_k, load_type>(block_tile_a, regs_a.data());
            write_to_smem<block_size, block_tile_n, block_tile_k, load_type>(block_tile_b, regs_b.data());
            __syncthreads();
        }
        mma(i);
    }

    // Write out C
    // This should access tile C in the same order as in the matmul loop!

    const int im_base = ti_m * block_tile_m;
    const int in_base = ti_n * block_tile_n;

    const bool c_in_bounds =
        (m_aligned || m % block_tile_m == 0 || im_base + block_tile_m <= m) &&
        (n_aligned || n % block_tile_n == 0 || in_base + block_tile_n <= n);

    select(c_in_bounds, [&]<bool c_in_bounds> {
        unroll2d<warp_tiles_mn_per_warp, frg_c_type::items_per_thread>([&]<int iwti, int mn_item> {
            const auto [mfma_im, mfma_in] = indexer::item_to_matrix_c(lane, mn_item);

            const int wti = warp * warp_tiles_mn_per_warp + iwti;
            const int wtm = wti % warp_tiles_m;
            const int wtn = wti / warp_tiles_m;

            const int bim = wtm * warp_tile_m + mfma_im;
            const int bin = wtn * warp_tile_n + mfma_in;

            const int im = im_base + bim;
            const int in = in_base + bin;

            const auto val = bf16_from_fp32(block_c_frg[iwti].thread_values()[mn_item]);

            if (c_in_bounds || im < m && in < n) {
                __builtin_nontemporal_store(std::bit_cast<uint16_t>(val), reinterpret_cast<uint16_t*>(&c[im * n + in]));
            }
        });
    });
}

template<
    int block_size,
    cube block_tile,
    cube warp_tile,
    bool pipelined_main_loop = false,
    typename load_type = __uint128_t
>
void run_kernel(
    const fp8* a,
    const fp8* b,
    const fp32* as,
    const fp32* bs,
    bf16* c,
    int m,
    int n,
    int k,
    bool measure
) {
    const int grid_m = ceil_div(m, block_tile.m);
    const int grid_n = ceil_div(n, block_tile.n);

    hipEvent_t start, stop;
    if (measure) {
        HIP_CHECK(hipEventCreate(&start));
        HIP_CHECK(hipEventCreate(&stop));
        HIP_CHECK(hipEventRecord(start, 0));
    }

    // select(m % block_tile.m == 0, [&]<bool m_aligned> {
    //     select(n % block_tile.n == 0, [&]<bool n_aligned> {
    //         select(k % block_tile.k == 0, [&]<bool k_aligned> {
                kernel<
                    block_size,
                    block_tile,
                    warp_tile,
                    load_type,
                    pipelined_main_loop,
                    false, // m_aligned,
                    false, // n_aligned,
                    false  // k_aligned
                ><<<
                    dim3(grid_m, grid_n),
                    dim3(block_size),
                    0
                >>>(
                    a,
                    b,
                    as,
                    bs,
                    c,
                    m,
                    n,
                    k
                );
    //         });
    //     });
    // });

    HIP_CHECK(hipGetLastError());

    if (measure) {
        HIP_CHECK(hipEventRecord(stop, 0));
        HIP_CHECK(hipDeviceSynchronize());
        HIP_CHECK(hipEventSynchronize(stop));

        float ms = 0;
        HIP_CHECK(hipEventElapsedTime(&ms, start, stop));
        const double time = ms / 1'000.0;

        const double memory = m * k * sizeof(fp8) + n * k * sizeof(fp8) + m * n * sizeof(bf16);
        const double ops =
            double(m) * n * k * 2 // Multiply + add for each pair
            + (double(m) * n * 2) * ceil_div(k, warp_tile.k); // scaling

        const double memory_tput = memory / time / (1000.0 * 1000 * 1000);
        const double compute_tput = ops / time / (1000.0 * 1000 * 1000 * 1000);

        std::cerr
            << std::fixed
            << std::setprecision(2)
            << "(" << m << " " << n << " " << k << ") "
            << "(" << block_tile.m << " " << block_tile.n << " " << block_tile.k << ") "
            << "(" << warp_tile.m << " " << warp_tile.n << " " << warp_tile.k << ") "
            << pipelined_main_loop << " "
            << block_size << ": "
            << ms << " ms "
            << (time * 1'000'000) << " us "
            << memory_tput << " GB/s "
            << compute_tput << " TFLOPS"
            << std::endl;

        HIP_CHECK(hipEventDestroy(start));
        HIP_CHECK(hipEventDestroy(stop));
    }
}

void run(
    uintptr_t a_ptr,
    uintptr_t b_ptr,
    uintptr_t as_ptr,
    uintptr_t bs_ptr,
    uintptr_t c_ptr,
    int m,
    int n,
    int k,
    bool measure
) {
    // In the kernels we assume 128-bit alignment.
    assert(a_ptr % 16 == 0);
    assert(b_ptr % 16 == 0);
    assert(as_ptr % 16 == 0);
    assert(bs_ptr % 16 == 0);
    assert(c_ptr % 16 == 0);

    const auto* a = reinterpret_cast<const fp8*>(a_ptr);
    const auto* b = reinterpret_cast<const fp8*>(b_ptr);
    const auto* as = reinterpret_cast<const fp32*>(as_ptr);
    const auto* bs = reinterpret_cast<const fp32*>(bs_ptr);
    auto* c = reinterpret_cast<bf16*>(c_ptr);

    /*
    run_kernel<256, cube{64, 64, 64}, cube{32, 32, 16}, true>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{64, 64, 64}, cube{16, 16, 32}, true>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{64, 64, 64}, cube{32, 32, 16}, false>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{64, 64, 64}, cube{16, 16, 32}, false>(a, b, as, bs, c, m, n, k, measure);

    run_kernel<256, cube{128, 64, 64}, cube{32, 32, 16}, true>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{128, 64, 64}, cube{16, 16, 32}, true>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{128, 64, 64}, cube{32, 32, 16}, false>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{128, 64, 64}, cube{16, 16, 32}, false>(a, b, as, bs, c, m, n, k, measure);

    run_kernel<256, cube{64, 128, 64}, cube{32, 32, 16}, true>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{64, 128, 64}, cube{16, 16, 32}, true>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{64, 128, 64}, cube{32, 32, 16}, false>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{64, 128, 64}, cube{16, 16, 32}, false>(a, b, as, bs, c, m, n, k, measure);

    run_kernel<256, cube{64, 64, 128}, cube{32, 32, 16}, true>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{64, 64, 128}, cube{16, 16, 32}, true>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{64, 64, 128}, cube{32, 32, 16}, false>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{64, 64, 128}, cube{16, 16, 32}, false>(a, b, as, bs, c, m, n, k, measure);

    run_kernel<256, cube{128, 128, 64}, cube{32, 32, 16}, true>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{128, 128, 64}, cube{16, 16, 32}, true>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{128, 128, 64}, cube{32, 32, 16}, false>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{128, 128, 64}, cube{16, 16, 32}, false>(a, b, as, bs, c, m, n, k, measure);

    run_kernel<256, cube{64, 128, 128}, cube{32, 32, 16}, true>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{64, 128, 128}, cube{16, 16, 32}, true>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{64, 128, 128}, cube{32, 32, 16}, false>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{64, 128, 128}, cube{16, 16, 32}, false>(a, b, as, bs, c, m, n, k, measure);

    run_kernel<256, cube{128, 64, 128}, cube{32, 32, 16}, true>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{128, 64, 128}, cube{16, 16, 32}, true>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{128, 64, 128}, cube{32, 32, 16}, false>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{128, 64, 128}, cube{16, 16, 32}, false>(a, b, as, bs, c, m, n, k, measure);

    run_kernel<256, cube{128, 128, 128}, cube{32, 32, 16}, true>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{128, 128, 128}, cube{16, 16, 32}, true>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{128, 128, 128}, cube{32, 32, 16}, false>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{128, 128, 128}, cube{16, 16, 32}, false>(a, b, as, bs, c, m, n, k, measure);
    */

    // run_kernel<256, cube{64, 64, 128}, cube{32, 32, 16}, false>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{128, 64, 128}, cube{32, 32, 16}, false>(a, b, as, bs, c, m, n, k, measure);
}

PYBIND11_MODULE(fp8, m) {
  m.def("fp8", &run, "HIP kernel");
}
"""

hip_module = load_inline(
    name="fp8",
    cpp_sources="",
    cuda_sources=kernel_cpp.replace('@', chr(92)),
    with_cuda=True,
    verbose=False,
    extra_cuda_cflags=(["-save-temps"] if TESTING is not None else []) + ["-std=c++20"],
    build_directory="/workspace/build/" if TESTING == "vscode" else "/gpumode/amd/fp8/build/" if TESTING is not None else None,
    #no_implicit_headers=True,
)

first = True

cache_m = 0
cache_n = 0
cache_k = 0
cache_i = 0

def custom_kernel(data: input_t) -> output_t:
    """
    Reference implementation of block-scale fp8 gemm
    Args:
        data: Tuple that expands to:
            a: torch.Tensor[float8_e4m3fnuz] of shape [m, k],
            b: torch.Tensor[float8_e4m3fnuz] of shape [n, k],
            a_scale: torch.Tensor[float32] of shape [m, k // 128],
            b_scale: torch.Tensor[float32] of shape [n // 128, k // 128],
            c: torch.Tensor[bfloat16] of shape [m, n]
    Returns:
        Tensor containing output in bf16
    """

    global first
    if first:
        print("executing on", torch.cuda.get_device_name(), file=sys.stderr)
        first = False

    a, b, a_scale, b_scale, c = data

    m, n = c.shape
    k = a.shape[1]

    global cache_m
    global cache_n
    global cache_k
    global cache_i

    if cache_m != m or cache_n != n or cache_k != k:
        cache_m = m
        cache_n = n
        cache_k = k
        cache_i = 0
    else:
        cache_i += 1

    # Don't check the performance on the first iteration to allow for some warmup
    measure = False
    if cache_i == 1:
        measure = True

    hip_module.fp8(
        a.data_ptr(),
        b.data_ptr(),
        a_scale.data_ptr(),
        b_scale.data_ptr(),
        c.data_ptr(),
        m,
        n,
        k,
        measure
    )

    return c

No newline at end of file
+ #!POPCORN leaderboard amd-fp8-mm
#!POPCORN gpu MI300
from task import input_t, output_t
import torch
from torch.utils.cpp_extension import load_inline
import time
import os
import sys

if "PYTORCH_ROCM_ARCH" not in os.environ:
    os.environ["PYTORCH_ROCM_ARCH"] = "gfx942:xnack-"

TESTING = os.environ.get("GPUMODE_TESTING", None)

kernel_cpp = r"""
#include <hip/hip_runtime.h>
#include <hip/hip_fp16.h>
#include <hip/hip_bf16.h>
#include <hip/hip_fp8.h>
#include <pybind11/pybind11.h>
#include <iostream>
#include <iomanip>
#include <bit>

#define HIP_CHECK(condition)                                                                  @
    do                                                                                        @
    {                                                                                         @
        hipError_t error = condition;                                                         @
        if(error != hipSuccess)                                                               @
        {                                                                                     @
            std::cerr << "Error " << hipGetErrorName(error) << '(' << error << ')' << ": "    @
                      << hipGetErrorString(error) << " in " << __func__ << " at " << __FILE__ @
                      << ':' << __LINE__ << '@n';                                             @
            exit(error);                                                                      @
        }                                                                                     @
    }                                                                                         @
    while(false)

using fp8 = __hip_fp8_e4m3_fnuz;
using bf16 = __hip_bfloat16;
using fp32 = float;
using fp32x4 = fp32 __attribute__((ext_vector_type(4)));
using i32x4 = int32_t __attribute__((ext_vector_type(4)));
using fp32x16 = fp32 __attribute__((ext_vector_type(16)));

struct cube {
    int m, n, k;
};

constexpr int warp_size = 64;
constexpr int cache_line_size = 128;

constexpr int m_block_size_multiple = 32;
constexpr int n_block_size_multiple = 32;
constexpr int k_block_size_multiple = 128;

using register_type = uint32_t;

template <typename T, typename U>
__host__ __device__ __forceinline__
constexpr auto ceil_div(T a, U b) {
    return (a + b - 1) / b;
}

template<auto a, auto b>
__host__ __device__ __forceinline__
constexpr auto divide_exact() {
    static_assert(a % b == 0, "does not divide exact!");
    return a / b;
}

template<int inc, typename seq>
struct multiply_by_inc;

template<int inc, int... Is>
struct multiply_by_inc<inc, std::integer_sequence<int, Is...>> {
    using type = std::integer_sequence<int, (inc * Is)...>;
};

template<int I, int N, int inc, int... Is>
struct make_index_sequence_with_inc_helper {
    using type = typename multiply_by_inc<inc, std::make_integer_sequence<int, (N - I) / inc>>::type;
};

template<int I, int N, int inc>
using make_index_sequence_with_inc = typename make_index_sequence_with_inc_helper<I, N, inc>::type;

template<typename F, int... Is>
__device__ __forceinline__
void unroll_apply(F f, std::integer_sequence<int, Is...>) {
    (f.template operator()<Is>(), ...);
}

template<int I, int N, int inc = 1, typename F>
__device__ __forceinline__
void unroll(F f) {
    unroll_apply(f, make_index_sequence_with_inc<I, N, inc>{});
}

template<int I, typename F>
__device__ __forceinline__
void unroll1d(F f) {
    unroll<0, I>(f);
}

template<int I, int J, typename F>
__device__ __forceinline__
void unroll2d(F f) {
    unroll<0, I>([&]<int i> {
        unroll<0, J>([&]<int j> {
            f.template operator()<i, j>();
        });
    });
}

template<int I, int J, int K, typename F>
__device__ __forceinline__
void unroll3d(F f) {
    unroll<0, I>([&]<int i> {
        unroll<0, J>([&]<int j> {
            unroll<0, K>([&]<int k> {
                f.template operator()<i, j, k>();
            });
        });
    });
}

template <typename T, size_t N>
__device__ __forceinline__
void clear(T (&array)[N]) {
    unroll<0, N>([&]<int i> {
        array[i] = T{0};
    });
}

__device__ __forceinline__
bf16 bf16_from_fp32(float x) {
    // HIP's conversion function does all kinds of checks
    // for odd cases (NaN, subnormals) that we don't care about.
    // This generates absolutely abysmal code, so just truncate
    // the upper bits to get the right value like the
    // Opperpython intended.

    return std::bit_cast<bf16>(
        static_cast<uint16_t>(
            std::bit_cast<uint32_t>(x) >> 16
        )
    );
}

__device__ __forceinline__
fp32 fp32_from_fp8(fp8 x) {
    // HIP's conversion from fp8 to fp32 is slow on anything that
    // doesn't have the hardware instructions to do it. The software
    // method deals with special cases (NaN, subnormals), but we
    // don't care about that here since we don't expect those in
    // the input. Therefore, we can optimize the software implementation
    // by just shuffling the bits.
#ifdef __gfx942__
    // MI300 has an instruction for this.
    return float(x);
#else
    // Fallback case
    // TODO: Find a faster option
    return float(x);
#endif
}

template <typename F>
__device__ __host__ __forceinline__
void select(bool cond, F f) {
    if (cond) {
        f.template operator()<true>();
    } else {
        f.template operator()<false>();
    }
}

template<int dpp_ctrl, int row_mask = 0xf, int bank_mask = 0xf, bool bound_ctrl = false>
__device__ __forceinline__
uint32_t shfl_dpp(uint32_t x) {
    return __builtin_amdgcn_update_dpp(x, x, dpp_ctrl, row_mask, bank_mask, bound_ctrl);
}

template<int lane_stride>
__device__ __forceinline__
uint32_t transpose_4x4_f8_v2(uint32_t input) {
    static_assert(lane_stride < warp_size / 4, "lane stride is too large");
    static_assert((lane_stride & (lane_stride - 1)) == 0, "line stride has to be a power of 2");
    static_assert(lane_stride == 1, "DPP implementation requires lane_stride == 1");
    // input:
    // byte 0 1 2 3
    //      0 1 2 3 lane X
    //      4 5 6 7 lane X+lane_stride
    //      8 9 A B lane X+lane_stride
    //      C D E F lane X+lane_stride
    // swap pairs of lanes to get
    // 0 1 2 3
    // 4 5 6 7
    // C D E F
    // 8 9 A B
    // then use byteperm to swap pairs horizontally + merge the
    // two results to get 2x2 transposed
    // 0 4 2 6
    // 1 5 3 7
    // 8 C A E
    // 9 D B F
    const auto lane = __lane_id();
    const auto group_lane_index = lane / lane_stride % 4;
    const auto t2x2 = __builtin_amdgcn_perm(
        // __shfl_xor(input, lane_stride), // Swap pairs
        shfl_dpp<0b10'11'00'01>(input),
        input,
        group_lane_index % 2 == 0
            ? 0x06'02'04'00
            : 0x03'07'01'05
    );
    // Now swap groups of 2 horizontally, and do the
    // same byteperm operation except with groups of 2x2.
    // 0 0 1 1     0 0 2 2
    // 0 0 1 1 --> 0 0 2 2
    // 2 2 3 3     1 1 3 3
    // 2 2 3 3     1 1 3 3
    const auto t4x4 = __builtin_amdgcn_perm(
        // __shfl_xor(t2x2, lane_stride * 2), // Swap groups
        shfl_dpp<0b01'00'11'10>(t2x2),
        t2x2,
        group_lane_index < 2
            ? 0x05'04'01'00
            : 0x03'02'07'06
    );

    // input = (lane << 24) | (lane << 16) | (lane << 8) | lane;
    return t4x4;
}

__device__ uint8_t llvm_amdgcn_raw_buffer_load_b8(i32x4 srsrc, uint32_t voffset, uint32_t soffset, uint32_t coherency)
    __asm("llvm.amdgcn.raw.buffer.load.i8");

__device__ uint16_t llvm_amdgcn_raw_buffer_load_b16(i32x4 srsrc, uint32_t voffset, uint32_t soffset, uint32_t coherency)
    __asm("llvm.amdgcn.raw.buffer.load.i16");

__device__ uint32_t llvm_amdgcn_raw_buffer_load_b32(i32x4 srsrc, uint32_t voffset, uint32_t soffset, uint32_t coherency)
    __asm("llvm.amdgcn.raw.buffer.load.i32");

__device__ uint64_t llvm_amdgcn_raw_buffer_load_b64(i32x4 srsrc, uint32_t voffset, uint32_t soffset, uint32_t coherency)
    __asm("llvm.amdgcn.raw.buffer.load.i64");

__device__ __uint128_t llvm_amdgcn_raw_buffer_load_b128(i32x4 srsrc, uint32_t voffset, uint32_t soffset, uint32_t coherency)
    __asm("llvm.amdgcn.raw.buffer.load.i128");

template <typename T>
struct buffer {
    struct buffer_resource {
        const void* ptr;
        uint32_t range;
        uint32_t config;
    };

    buffer_resource rsrc;

    __device__ __forceinline__
    buffer(T* pointer, uint32_t size) {
        this->rsrc = buffer_resource{
            reinterpret_cast<const void*>(pointer),
            static_cast<uint32_t>(size * sizeof(T)),
            // This is what CK uses, but what does it mean? It seems to mean DATA_FORMAT = 32 bit
            // We might be able to play with this later...
            0x00020000U
        };
    }

    template<int N>
    __device__ __forceinline__
    std::array<T, N> load(
        uint32_t wave_offset,
        uint32_t thread_offset
    ) const {
        constexpr const int load_size = sizeof(T) * N;

        using result_type = std::array<T, N>;

        if constexpr (load_size == 1) {
            return std::bit_cast<result_type>(llvm_amdgcn_raw_buffer_load_b8(
                std::bit_cast<i32x4>(this->rsrc),
                thread_offset,
                wave_offset,
                0
            ));
        } else if constexpr (load_size == 2) {
            return std::bit_cast<result_type>(llvm_amdgcn_raw_buffer_load_b16(
                std::bit_cast<i32x4>(this->rsrc),
                thread_offset,
                wave_offset,
                0
            ));
        } else if constexpr (load_size == 4) {
            return std::bit_cast<result_type>(llvm_amdgcn_raw_buffer_load_b32(
                std::bit_cast<i32x4>(this->rsrc),
                thread_offset,
                wave_offset,
                0
            ));
        } else if constexpr (load_size == 8) {
            return std::bit_cast<result_type>(llvm_amdgcn_raw_buffer_load_b64(
                std::bit_cast<i32x4>(this->rsrc),
                thread_offset,
                wave_offset,
                0
            ));
        } else if constexpr (load_size == 16) {
            return std::bit_cast<result_type>(llvm_amdgcn_raw_buffer_load_b128(
                std::bit_cast<i32x4>(this->rsrc),
                thread_offset,
                wave_offset,
                0
            ));
        } else {
            static_assert(load_size == -1, "load size not implemented");
        }
    }
};

// A general fast global memory needs to be as follows:
// - Group of 16 bytes so that we can use a 128-bit load
// - The fast path requires entire cache lines to be loaded at once. CDNA3
//   cache line size is 128 bytes, so the ideal matrix size has an inner
//   dimension (block_tile_m; source is column major) of at least 128.
// - We want every thread to participate, so we need at least
//   block_size / (128 / 16) elements in the N direction.
//   block_size == 64 => 8
//   block_size == 256 => 32
//   block_size == 1024 => 128
// - We assume that the input is already aligned to 128 bits, and that the m stride
//   is also aligned such. m, n, k are all divisible by 64, so this should be fine.
//
//   ┌───┬───┬───┬───┐ ┌───┐
//   │0  │4  │8  │12 │ │   │ = 16 bytes
//   ├───┼───┼───┼───┤ └───┘
//   │1  │5  │9  │13 │
//   ├───┼───┼───┼───┤
//   │2  │6  │10 │14 │
//   ├───┼───┼───┼───┤
//   │3  │7  │11 │15 │
//   └───┴───┴───┴───┘
template<
    int block_size,
    int block_tile_m,
    int block_tile_n,
    typename load_type
>
struct block_loader {
    static_assert(block_tile_m % sizeof(load_type) == 0, "tile inner dimension has to be divisible by load type size");

    constexpr static int total_loads = block_tile_m * block_tile_n / sizeof(load_type);
    static_assert(total_loads % block_size == 0, "total amount of loads needs to be divisible by the block size");

    constexpr static int loads_per_block_tile_m = block_tile_m / sizeof(load_type);
    constexpr static int loads_per_thread = total_loads / block_size;

    constexpr static int group_size = 4; // Coincides with 4x4 transpose.

    using frg_type = std::array<load_type, loads_per_thread>;

    __device__ __forceinline__
    static frg_type load_from_global(
        const fp8* block_tile_src,
        int m,
        int n,
        int block_off_m,
        int block_off_n
    ) {
        const auto offset = block_off_n * m + block_off_m;
        block_tile_src += offset;
        const auto size = m * n - offset;
        const auto buf = buffer<const load_type>(reinterpret_cast<const load_type*>(block_tile_src), size);

        const int tid = threadIdx.x;

        frg_type result;

        unroll<0, loads_per_thread>([&]<int j> {
            const int i = j * block_size + tid;
            // const int row = i % loads_per_block_tile_m;
            // const int col = i / loads_per_block_tile_m;
            // const int src_off = row * sizeof(load_type) + col * m;

            // swizzle the lanes such that groups of 4 columns are next to eachother.
            const int group_index = i % group_size;
            const int group_bank = i / group_size;
            const int row = group_bank % loads_per_block_tile_m;
            const int col = group_index + group_bank / loads_per_block_tile_m * group_size;
            const int src_off = row * sizeof(load_type) + col * m;

            result[j] = buf.template load<1>(0, src_off)[0];
        });

        return result;
    }

    __device__ __forceinline__
    static void store_to_smem(
        fp8* block_tile_dst,
        frg_type thread_src,
        int m,
        int n,
        int block_off_m,
        int block_off_n
    ) {
        const int tid = threadIdx.x;

        // The buffer load allows us to omit bounds checking with loading,
        // but that then loads invalid elements. To fix that, we check
        // for each element whether its supposed to be in range, and if not
        // zero it out.

        unroll<0, loads_per_thread>([&]<int j> {
            const int i = j * block_size + tid;

            // swizzle the lanes such that groups of 4 columns are next to eachother.
            const int group_index = i % group_size;
            const int group_bank = i / group_size;
            const int row = group_bank % loads_per_block_tile_m;
            const int col = group_index + group_bank / loads_per_block_tile_m * group_size;

            const int src_row = row * sizeof(load_type) + block_off_m;
            const int src_col = col + block_off_n;
            const bool in_bounds = src_row < m && src_col < n;

            auto* dst = reinterpret_cast<uint8_t*>(block_tile_dst);

            // Store transposed
            // const auto src = std::bit_cast<std::array<uint8_t, sizeof(load_type)>>(thread_src[j]);
            // TODO: Check bounds?
            // unroll<0, sizeof(load_type)>([&]<int k> {
            //     const int dst_row = row * sizeof(load_type) + k;
            //     const int dst_col = col;
            //     dst[dst_col + dst_row * (block_tile_n + 4)] = in_bounds ? src[k] : 0;
            // });

            // Store transposed using 4x4 groups.
            const auto src = std::bit_cast<std::array<uint32_t, 4>>(thread_src[j]);
            constexpr int lane_stride = 1; //loads_per_block_tile_m;
            unroll<0, sizeof(load_type), sizeof(uint32_t)>([&]<int k> {
                const int dst_row = row * sizeof(load_type) + k;
                const int dst_col = col;
                auto v = src[k / sizeof(uint32_t)];
                v = in_bounds ? v : 0;
                v = transpose_4x4_f8_v2<lane_stride>(v);
                const auto group_lane_index = __lane_id() / lane_stride % 4;
                *reinterpret_cast<uint32_t*>(&dst[(dst_col - dst_col % 4) + (dst_row + group_lane_index) * (block_tile_n + 4)])
                    = v;
            });
        });
    }
};

template <int warp_tile_m_, int warp_tile_n_, typename T>
struct mfma_fragment {
    using type = T;

    constexpr static const int warp_tile_m = warp_tile_m_;
    constexpr static const int warp_tile_n = warp_tile_n_;

    constexpr static const int total_items = warp_tile_m * warp_tile_n;

    constexpr static const int items_per_thread = divide_exact<total_items, warp_size>();
    constexpr static const int registers_per_thread = divide_exact<items_per_thread * sizeof(T), sizeof(register_type)>();

    register_type regs[registers_per_thread];

    __device__ __forceinline__
    constexpr static mfma_fragment zero() {
        return mfma_fragment{{}};
    }

    __device__ __forceinline__
    std::array<T, items_per_thread>& thread_values() {
        return *reinterpret_cast<std::array<T, items_per_thread>*>(&this->regs);
    }

    __device__ __forceinline__
    const std::array<T, items_per_thread>& thread_values() const {
        return *reinterpret_cast<const std::array<T, items_per_thread>*>(&this->regs);
    }

    __device__ __forceinline__
    void clear() {
        unroll<0, registers_per_thread>([&]<int i> {
            this->regs[i] = 0;
        });
    }

    static constexpr int first_item_of_reg(int reg) {
        return reg * sizeof(register_type);
    }
};

template <int m, int n, int k>
struct mfma_f32_f32_f32;

template <>
struct mfma_f32_f32_f32<16, 16, 4> {
    using frg_a_type = mfma_fragment<16, 4, float>;
    using frg_b_type = mfma_fragment<16, 4, float>;
    using frg_c_type = mfma_fragment<16, 16, float>;

    __device__ __forceinline__
    static void execute(
        frg_c_type& c,
        const frg_a_type& a,
        const frg_b_type& b
    ) {
        c = std::bit_cast<frg_c_type>(
            __builtin_amdgcn_mfma_f32_16x16x4f32(
                std::bit_cast<float>(a),
                std::bit_cast<float>(b),
                std::bit_cast<fp32x4>(c),
                0,
                0,
                0
            )
        );
    }
};

template <>
struct mfma_f32_f32_f32<32, 32, 2> {
    using frg_a_type = mfma_fragment<32, 2, float>;
    using frg_b_type = mfma_fragment<32, 2, float>;
    using frg_c_type = mfma_fragment<32, 32, float>;

    __device__ __forceinline__
    static void execute(
        frg_c_type& c,
        const frg_a_type& a,
        const frg_b_type& b
    ) {
        c = std::bit_cast<frg_c_type>(
            __builtin_amdgcn_mfma_f32_32x32x2f32(
                std::bit_cast<float>(a),
                std::bit_cast<float>(b),
                std::bit_cast<fp32x16>(c),
                0,
                0,
                0
            )
        );
    }
};

template <int m, int n, int k>
struct mfma_f32_f8_f8;

template <>
struct mfma_f32_f8_f8<16, 16, 32> {
    using frg_a_type = mfma_fragment<16, 32, fp8>;
    using frg_b_type = mfma_fragment<16, 32, fp8>;
    using frg_c_type = mfma_fragment<16, 16, float>;

    __device__ __forceinline__
    static void execute(
        frg_c_type& c,
        const frg_a_type& a,
        const frg_b_type& b
    ) {
#ifdef __HIP_DEVICE_COMPILE__
#ifdef __gfx942__
    c = std::bit_cast<frg_c_type>(
        __builtin_amdgcn_mfma_f32_16x16x32_fp8_fp8(
            std::bit_cast<uint64_t>(a),
            std::bit_cast<uint64_t>(b),
            std::bit_cast<fp32x4>(c),
            0,
            0,
            0
        )
    );
#else
    // Fallback copied from CK, this way we can test on MI210.
    using fallback_mfma = mfma_f32_f32_f32<16, 16, 4>;
    const auto& a_values = a.thread_values();
    const auto& b_values = b.thread_values();
    unroll<0, frg_a_type::items_per_thread>([&]<int k> {
        const auto fallback_a = std::bit_cast<fallback_mfma::frg_a_type>(static_cast<float>(a_values[k]));
        const auto fallback_b = std::bit_cast<fallback_mfma::frg_b_type>(static_cast<float>(b_values[k]));
        fallback_mfma::execute(c, fallback_a, fallback_b);
    });
#endif
#endif
    }
};

template<>
struct mfma_f32_f8_f8<32, 32, 16> {
    using frg_a_type = mfma_fragment<32, 16, fp8>;
    using frg_b_type = mfma_fragment<32, 16, fp8>;
    using frg_c_type = mfma_fragment<32, 32, float>;

    __device__ __forceinline__
    static void execute(
        frg_c_type& c,
        const frg_a_type& a,
        const frg_b_type& b
    ) {
#ifdef __HIP_DEVICE_COMPILE__
#ifdef __gfx942__
    c = std::bit_cast<frg_c_type>(
        __builtin_amdgcn_mfma_f32_32x32x16_fp8_fp8(
            std::bit_cast<uint64_t>(a),
            std::bit_cast<uint64_t>(b),
            std::bit_cast<fp32x16>(c),
            0,
            0,
            0
        )
    );
#else
    // Fallback copied from CK, this way we can test on MI210.
    using fallback_mfma = mfma_f32_f32_f32<32, 32, 2>;
    const auto& a_values = a.thread_values();
    const auto& b_values = b.thread_values();
    unroll<0, frg_a_type::items_per_thread>([&]<int k> {
        const auto fallback_a = std::bit_cast<fallback_mfma::frg_a_type>(static_cast<float>(a_values[k]));
        const auto fallback_b = std::bit_cast<fallback_mfma::frg_b_type>(static_cast<float>(b_values[k]));
        fallback_mfma::execute(c, fallback_a, fallback_b);
    });
#endif
#endif
    }
};

// See CDNA3 manual, 7.1.4.1. Input layout
// The calculations here are obtained via the
// AMD matrix instruction calculator
// https://github.com/ROCm/amd_matrix_instruction_calculator
// There is a cleaner way to compute the mapping, but
// this is what the tool returns and I'm lazy. We only
// really need these two anyway for now.
template <typename mfma>
struct mfma_indexer;

template <>
struct mfma_indexer<mfma_f32_f8_f8<16, 16, 32>> {
    __device__ __forceinline__
    static constexpr std::pair<int, int> item_to_matrix_a(int lane, int item) {
        const int m = lane % 16;
        const int k = 8 * (lane / 16) + item;
        return {m, k};
    }

    __device__ __forceinline__
    static constexpr std::pair<int, int> item_to_matrix_b(int lane, int item) {
        const int n = lane % 16;
        const int k = 8 * (lane / 16) + item;
        return {n, k};
    }

    __device__ __forceinline__
    static constexpr std::pair<int, int> item_to_matrix_c(int lane, int item) {
        const int m = 4 * (lane / 16) + item;
        const int n = lane % 16;
        return {m, n};
    }
};

template <>
struct mfma_indexer<mfma_f32_f8_f8<32, 32, 16>> {
    __device__ __forceinline__
    static constexpr std::pair<int, int> item_to_matrix_a(int lane, int item) {
        const int m = lane % 32;
        const int k = 8 * (lane / 32) + item;
        return {m, k};
    }

    __device__ __forceinline__
    static constexpr std::pair<int, int> item_to_matrix_b(int lane, int item) {
        const int n = lane % 32;
        const int k = 8 * (lane / 32) + item;
        return {n, k};
    }

    __device__ __forceinline__
    static constexpr std::pair<int, int> item_to_matrix_c(int lane, int item) {
        const int n = 8 * (item / 4) % 32 + 4 * (lane / 32) + (item % 4);
        const int m = lane % 32;
        return {n, m};
    }
};

template <
    int block_size,
    cube block_tile,
    cube warp_tile,
    typename load_type,
    bool pipelined_main_loop = false
>
__global__ __launch_bounds__(block_size)
void kernel(
    const fp8* a,
    const fp8* b,
    const fp32* as,
    const fp32* bs,
    bf16* c,
    int m,
    int n,
    int k
) {
    constexpr int warps = block_size / warp_size;

    constexpr int block_tile_m = block_tile.m;
    constexpr int block_tile_n = block_tile.n;
    constexpr int block_tile_k = block_tile.k;

    static_assert(block_tile_m <= 128, "block tile M must be smaller than blockwise block size");
    static_assert(block_tile_n <= 128, "block tile N must be smaller than blockwise block size");
    static_assert(block_tile_k <= 128, "block tile K must be smaller than blockwise block size");

    constexpr int warp_tile_m = warp_tile.m;
    constexpr int warp_tile_n = warp_tile.n;
    constexpr int warp_tile_k = warp_tile.k;

    constexpr int c_total = block_tile_m * block_tile_n;

    static_assert(block_tile_m * block_tile_k % block_size == 0, "size(block_tile_a) has to be divisible by the block size");
    static_assert(block_tile_n * block_tile_k % block_size == 0, "size(block_tile_b) has to be divisible by the block size");
    static_assert(c_total % block_size == 0, "size(block_tile_c) as to be divisible by the block size");

    static_assert(block_tile_m % warp_tile_m == 0, "warp tile M has to divide block tile M");
    static_assert(block_tile_n % warp_tile_n == 0, "warp tile N has to divide block tile N");
    static_assert(block_tile_k % warp_tile_k == 0, "warp tile K has to divide block tile K");

    constexpr int warp_tiles_m = block_tile_m / warp_tile_m;
    constexpr int warp_tiles_n = block_tile_n / warp_tile_n;
    constexpr int warp_tiles_k = block_tile_k / warp_tile_k;

    constexpr int warp_tiles_mn = warp_tiles_m * warp_tiles_n;

    // number of warp tiles has to be divisible by the number of warps
    constexpr int warp_tiles_mn_per_warp = divide_exact<warp_tiles_mn, warps>();

    constexpr int warp_tile_mn_items = warp_tile_m * warp_tile_n;

    using mfma = mfma_f32_f8_f8<warp_tile_m, warp_tile_n, warp_tile_k>;
    using frg_a_type = typename mfma::frg_a_type;
    using frg_b_type = typename mfma::frg_b_type;
    using frg_c_type = typename mfma::frg_c_type;
    using indexer = mfma_indexer<mfma>;

    using block_loader_a = block_loader<block_size, block_tile_m, block_tile_k, load_type>;
    using block_loader_b = block_loader<block_size, block_tile_n, block_tile_k, load_type>;

    constexpr int c_per_thread = c_total / block_size;
    static_assert(c_per_thread == warp_tiles_mn_per_warp * frg_c_type::items_per_thread, "sanity check");

    const int tid = threadIdx.x;

    const int warp = tid / warp_size;
    const int lane = __lane_id();

    // Swap direction to make bounds checking be first
    const int ti_m = gridDim.x - blockIdx.x - 1;
    const int ti_n = gridDim.y - blockIdx.y - 1;

    int sn = ceil_div(n, 128);

    frg_c_type block_c_frg[warp_tiles_mn_per_warp];
    unroll<0, warp_tiles_mn_per_warp>([&]<int i> {
        block_c_frg[i].clear();
    });

    __shared__ fp8 block_tile_a[block_tile_m * (block_tile_k + 4)];
    __shared__ fp8 block_tile_b[block_tile_n * (block_tile_k + 4)];
    __shared__ float block_tile_as[block_size];
    float thread_tile_bs;

    const auto load_input = [&](int i) {
        float frg_as;
        if (tid < 128) {
            frg_as = as[i / 128 * m + ti_m * block_tile_m + tid];
        }
        float frg_bs = bs[i / 128 * sn + ti_n * block_tile_n / 128];
        const auto frg_a = block_loader_a::load_from_global(
            a, m, k, ti_m * block_tile_m, i
        );
        const auto frg_b = block_loader_b::load_from_global(
            b, n, k, ti_n * block_tile_n, i
        );
        return std::make_tuple(frg_a, frg_b, frg_as, frg_bs);
    };

    const auto store_input = [&](int i, const auto& frg_a, const auto& frg_b, const auto& frg_as, const auto& frg_bs) {
        block_loader_a::store_to_smem(block_tile_a, frg_a, m, k, ti_m * block_tile_m, i);
        block_loader_b::store_to_smem(block_tile_b, frg_b, n, k, ti_n * block_tile_n, i);
        block_tile_as[tid] = frg_as;
        thread_tile_bs = frg_bs;
    };

    const auto mma = [&](int i) {
        frg_a_type frg_a[warp_tiles_mn_per_warp * warp_tiles_k];
        unroll1d<warp_tiles_mn_per_warp>([&]<int iwti> {
            const int wti = warp * warp_tiles_mn_per_warp + iwti;
            const int wtm = wti % warp_tiles_m;
            const int wtn = wti / warp_tiles_m;
            unroll<0, block_tile_k, warp_tile_k>([&]<int wtk_base> {
                constexpr int wtk = wtk_base / warp_tile_k;

                unroll<0, frg_a_type::registers_per_thread>([&]<int mk_reg> {
                    const auto [mfma_im, mfma_ik] = indexer::item_to_matrix_a(lane, frg_a_type::first_item_of_reg(mk_reg));
                    const int bim = wtm * warp_tile_m + mfma_im;
                    const int bik = wtk_base + mfma_ik;
                    frg_a[wtk * warp_tiles_mn_per_warp + iwti].regs[mk_reg] =
                        *reinterpret_cast<const uint32_t*>(&block_tile_a[bik + bim * (block_tile_k + 4)]);
                });
            });
        });

        frg_b_type frg_b[warp_tiles_mn_per_warp * warp_tiles_k];
        unroll1d<warp_tiles_mn_per_warp>([&]<int iwti> {
            const int wti = warp * warp_tiles_mn_per_warp + iwti;
            const int wtm = wti % warp_tiles_m;
            const int wtn = wti / warp_tiles_m;
            unroll<0, block_tile_k, warp_tile_k>([&]<int wtk_base> {
                constexpr int wtk = wtk_base / warp_tile_k;

                unroll<0, frg_b_type::registers_per_thread>([&]<int nk_reg> {
                    const auto [mfma_in, mfma_ik] = indexer::item_to_matrix_b(lane, frg_b_type::first_item_of_reg(nk_reg));
                    const int bin = wtn * warp_tile_n + mfma_in;
                    const int bik = wtk_base + mfma_ik;
                    frg_b[wtk * warp_tiles_mn_per_warp + iwti].regs[nk_reg] =
                        *reinterpret_cast<const uint32_t*>(&block_tile_b[bik + bin * (block_tile_k + 4)]);
                });
            });
        });

        frg_c_type warp_frg_c[warp_tiles_mn_per_warp];
        unroll<0, warp_tiles_mn_per_warp>([&]<int i> {
            warp_frg_c[i].clear();
        });

        unroll2d<warp_tiles_mn_per_warp, warp_tiles_k>([&]<int iwti, int wtk> {
            mfma::execute(
                warp_frg_c[iwti],
                frg_a[wtk * warp_tiles_mn_per_warp + iwti],
                frg_b[wtk * warp_tiles_mn_per_warp + iwti]
            );
        });

        unroll2d<warp_tiles_mn_per_warp, frg_c_type::items_per_thread>([&]<int iwti, int mn_item> {
            const int wti = warp * warp_tiles_mn_per_warp + iwti;
            const int wtm = wti % warp_tiles_m;

            const auto [mfma_im, mfma_in] = indexer::item_to_matrix_c(lane, mn_item);
            const int bim = wtm * warp_tile_m + mfma_im;

            block_c_frg[iwti].thread_values()[mn_item] += warp_frg_c[iwti].thread_values()[mn_item]
                * block_tile_as[bim]
                * thread_tile_bs;
        });
    };

    if constexpr (!pipelined_main_loop) {
        // Regular main loop
        for (int i = 0; i < k; i += block_tile_k) {
            const auto [frg_a, frg_b, frg_as, frg_bs] = load_input(i);
            store_input(i, frg_a, frg_b, frg_as, frg_bs);
            __syncthreads();
            mma(i);
            __syncthreads();
        }
    } else {
        // Pipelined main loop
        int i = 0;
        auto [frg_a, frg_b, frg_as, frg_bs] = load_input(i);
        store_input(i, frg_a, frg_b, frg_as, frg_bs);
        __syncthreads();

        for (; i + block_tile_k < k; i += block_tile_k) {
            std::tie(frg_a, frg_b, frg_as, frg_bs) = load_input(i + block_tile_k);
            __builtin_amdgcn_sched_barrier(0);
            mma(i);
            __syncthreads();
            store_input(i + block_tile_k, frg_a, frg_b, frg_as, frg_bs);
            __syncthreads();
        }
        mma(i);
    }

    // Write out C
    // This should access tile C in the same order as in the matmul loop!

    const int im_base = ti_m * block_tile_m;
    const int in_base = ti_n * block_tile_n;

    const bool c_in_bounds =
        (m % block_tile_m == 0 || im_base + block_tile_m <= m) &&
        (n % block_tile_n == 0 || in_base + block_tile_n <= n);

    select(c_in_bounds, [&]<bool c_in_bounds> {
        unroll2d<warp_tiles_mn_per_warp, frg_c_type::items_per_thread>([&]<int iwti, int mn_item> {
            const auto [mfma_im, mfma_in] = indexer::item_to_matrix_c(lane, mn_item);

            const int wti = warp * warp_tiles_mn_per_warp + iwti;
            const int wtm = wti % warp_tiles_m;
            const int wtn = wti / warp_tiles_m;

            const int bim = wtm * warp_tile_m + mfma_im;
            const int bin = wtn * warp_tile_n + mfma_in;

            const int im = im_base + bim;
            const int in = in_base + bin;

            const auto val = bf16_from_fp32(block_c_frg[iwti].thread_values()[mn_item]);

            if (c_in_bounds || im < m && in < n) {
                __builtin_nontemporal_store(std::bit_cast<uint16_t>(val), reinterpret_cast<uint16_t*>(&c[im * n + in]));
            }
        });
    });
}

template<
    int block_size,
    cube block_tile,
    cube warp_tile,
    bool pipelined_main_loop = false,
    typename load_type = __uint128_t
>
void run_kernel(
    const fp8* a,
    const fp8* b,
    const fp32* as,
    const fp32* bs,
    bf16* c,
    int m,
    int n,
    int k,
    bool measure
) {
    const int grid_m = ceil_div(m, block_tile.m);
    const int grid_n = ceil_div(n, block_tile.n);

    hipEvent_t start, stop;
    if (measure) {
        HIP_CHECK(hipEventCreate(&start));
        HIP_CHECK(hipEventCreate(&stop));
        HIP_CHECK(hipEventRecord(start, 0));
    }

    kernel<
        block_size,
        block_tile,
        warp_tile,
        load_type,
        pipelined_main_loop
    ><<<
        dim3(grid_m, grid_n),
        dim3(block_size),
        0
    >>>(
        a,
        b,
        as,
        bs,
        c,
        m,
        n,
        k
    );

    HIP_CHECK(hipGetLastError());

    if (measure) {
        HIP_CHECK(hipEventRecord(stop, 0));
        HIP_CHECK(hipDeviceSynchronize());
        HIP_CHECK(hipEventSynchronize(stop));

        float ms = 0;
        HIP_CHECK(hipEventElapsedTime(&ms, start, stop));
        const double time = ms / 1'000.0;

        const double memory = m * k * sizeof(fp8) + n * k * sizeof(fp8) + m * n * sizeof(bf16);
        const double ops =
            double(m) * n * k * 2 // Multiply + add for each pair
            + (double(m) * n * 2) * ceil_div(k, warp_tile.k); // scaling

        const double memory_tput = memory / time / (1000.0 * 1000 * 1000);
        const double compute_tput = ops / time / (1000.0 * 1000 * 1000 * 1000);

        std::cerr
            << std::fixed
            << std::setprecision(2)
            << "(" << m << " " << n << " " << k << ") "
            << "(" << block_tile.m << " " << block_tile.n << " " << block_tile.k << ") "
            << "(" << warp_tile.m << " " << warp_tile.n << " " << warp_tile.k << ") "
            << pipelined_main_loop << " "
            << block_size << ": "
            << ms << " ms "
            << (time * 1'000'000) << " us "
            << memory_tput << " GB/s "
            << compute_tput << " TFLOPS"
            << std::endl;

        HIP_CHECK(hipEventDestroy(start));
        HIP_CHECK(hipEventDestroy(stop));
    }
}

void run(
    uintptr_t a_ptr,
    uintptr_t b_ptr,
    uintptr_t as_ptr,
    uintptr_t bs_ptr,
    uintptr_t c_ptr,
    int m,
    int n,
    int k,
    bool measure
) {
    // In the kernels we assume 128-bit alignment.
    assert(a_ptr % 16 == 0);
    assert(b_ptr % 16 == 0);
    assert(as_ptr % 16 == 0);
    assert(bs_ptr % 16 == 0);
    assert(c_ptr % 16 == 0);

    const auto* a = reinterpret_cast<const fp8*>(a_ptr);
    const auto* b = reinterpret_cast<const fp8*>(b_ptr);
    const auto* as = reinterpret_cast<const fp32*>(as_ptr);
    const auto* bs = reinterpret_cast<const fp32*>(bs_ptr);
    auto* c = reinterpret_cast<bf16*>(c_ptr);

    // run_kernel<256, cube{64, 64, 128}, cube{32, 32, 16}, false>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{128, 64, 128}, cube{32, 32, 16}, true>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{128, 64, 128}, cube{32, 32, 16}, true>(a, b, as, bs, c, m, n, k, measure);

    // run_kernel<256, cube{128, 128, 64}, cube{16, 16, 32}, false>(a, b, as, bs, c, m, n, k, measure);
}

PYBIND11_MODULE(fp8, m) {
  m.def("fp8", &run, "HIP kernel");
}
"""

hip_module = load_inline(
    name="fp8",
    cpp_sources="",
    cuda_sources=kernel_cpp.replace('@', chr(92)),
    with_cuda=True,
    verbose=False,
    extra_cuda_cflags=(["-save-temps"] if TESTING is not None else []) + ["-std=c++20"],
    build_directory="/workspace/build/" if TESTING == "vscode" else "/gpumode/amd/fp8/build/" if TESTING is not None else None,
    no_implicit_headers=True,
)

first = True

cache_m = 0
cache_n = 0
cache_k = 0
cache_i = 0

def custom_kernel(data: input_t) -> output_t:
    """
    Reference implementation of block-scale fp8 gemm
    Args:
        data: Tuple that expands to:
            a: torch.Tensor[float8_e4m3fnuz] of shape [m, k],
            b: torch.Tensor[float8_e4m3fnuz] of shape [n, k],
            a_scale: torch.Tensor[float32] of shape [m, k // 128],
            b_scale: torch.Tensor[float32] of shape [n // 128, k // 128],
            c: torch.Tensor[bfloat16] of shape [m, n]
    Returns:
        Tensor containing output in bf16
    """

    global first
    if first:
        print("executing on", torch.cuda.get_device_name(), file=sys.stderr)
        first = False

    a, b, a_scale, b_scale, c = data

    m, n = c.shape
    k = a.shape[1]

    global cache_m
    global cache_n
    global cache_k
    global cache_i

    if cache_m != m or cache_n != n or cache_k != k:
        cache_m = m
        cache_n = n
        cache_k = k
        cache_i = 0
    else:
        cache_i += 1

    # Don't check the performance on the first iteration to allow for some warmup
    measure = False
    if cache_i == 1:
        measure = False

    hip_module.fp8(
        a.data_ptr(),
        b.data_ptr(),
        a_scale.data_ptr(),
        b_scale.data_ptr(),
        c.data_ptr(),
        m,
        n,
        k,
        measure
    )

    return c

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