submission 5798
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fp8_gemm.py
curl "https://kernelindex.com/api/v1/implementations/kernelbot-amd-fp8-mm-5798?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, 7168] · n=512 · seed=6563
AMD Instinct MI300X
360.3µs
#89 of 98
2025-04-20
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=576 · seed=12346
AMD Instinct MI300X
361.1µs
#86 of 98
2025-04-20
Show all 18 measurements ›Showing all 18 measurements ⌄
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=1536 · seed=8135
AMD Instinct MI300X
364.9µs
#81 of 98
2025-04-20
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=512 · seed=12341
AMD Instinct MI300X
368.5µs
#72 of 98
2025-04-20
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=576 · seed=9863
AMD Instinct MI300X
380.3µs
#67 of 98
2025-04-20
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=4608 · seed=7531
AMD Instinct MI300X
410.3µs
#75 of 98
2025-04-20
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=1536 · seed=6543
AMD Instinct MI300X
511.3µs
#59 of 98
2025-04-20
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=4608 · seed=65436
AMD Instinct MI300X
1.46ms
#68 of 98
2025-04-20
Reported · How evidence levels are derived →
Source and license
sourceavailable
revision digestsha256:3459610e687f1e6be29b4ae522b94f4dc15aeceff2bdb19df6af37b0760d8ab7
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 = "GPUMODE_TESTING" in os.environ

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;

template <typename T, typename U>
__host__ __device__
constexpr auto ceil_div(T a, U b) {
    return (a + b - 1) / 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 block_size,
    int block_tile_m,
    int block_tile_n,
    typename load_type,
    bool m_aligned = false,
    bool n_aligned = false
>
__device__
__forceinline__
void block_tile_load_fast_linear(
    // Shared memory destination
    fp8* block_tile_dst,
    // 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;

    if (completely_in_bounds) {
        unroll<0, loads_per_thread>([&]<int j> {
            const int i = j * block_size + tid;
            // Make sure that the row to access is the inner dimension to
            // get good caching.
            const int row = i % loads_per_block_tile_m;
            const int col = i / loads_per_block_tile_m;
            const int dst_off = row * sizeof(load_type) + col * block_tile_m;
            const int src_off = row * sizeof(load_type) + col * m;

            // TODO: We might want to make a version which transposes the matrix
            // while loading it. That's for later, though.
            *reinterpret_cast<load_type*>(block_tile_dst + dst_off) =
                *reinterpret_cast<const load_type*>(block_tile_src + src_off);
        });
    } else {
        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 dst_off = row * sizeof(load_type) + col * 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.
            if ((m_aligned || src_row < m) && (n_aligned || src_col < n)) {
                *reinterpret_cast<load_type*>(block_tile_dst + dst_off) =
                    *reinterpret_cast<const load_type*>(block_tile_src + src_off);
            } else {
                *reinterpret_cast<load_type*>(block_tile_dst + dst_off) = 0;
            }
        });
    }
}

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

template <>
struct mfma_f32_f32_f32<16, 16, 4> {
    __device__
    static void execute(
        float (&c)[4],
        float a,
        float b
    ) {
        const auto result = __builtin_amdgcn_mfma_f32_16x16x4f32(
            a,
            b,
            std::bit_cast<fp32x4>(c),
            0,
            0,
            0
        );
        unroll<0, 4>([&]<int i> {
            c[i] = result[i];
        });
    }
};

template <>
struct mfma_f32_f32_f32<32, 32, 2> {
    __device__
    static void execute(
        float (&c)[16],
        float a,
        float b
    ) {
        const auto result = __builtin_amdgcn_mfma_f32_32x32x2f32(
            a,
            b,
            std::bit_cast<fp32x16>(c),
            0,
            0,
            0
        );
        unroll<0, 16>([&]<int i> {
            c[i] = result[i];
        });
    }
};

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

template <>
struct mfma_f32_f8_f8<16, 16, 32> {
    __device__
    static void execute(
        float (&c)[4],
        const fp8 (&a)[8],
        const fp8 (&b)[8]
    ) {
#ifdef __HIP_DEVICE_COMPILE__
#ifdef __gfx942__
    const auto result = __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
    );
    unroll<0, 4>([&]<int i> {
        c[i] = result[i];
    });
#else
    // Fallback so we can test on MI210.
    // Apparently the layouts are such that we can just do this.
    unroll<0, 8>([&]<int k> {
        const auto a_f32 = static_cast<float>(a[k]);
        const auto b_f32 = static_cast<float>(b[k]);
        mfma_f32_f32_f32<16, 16, 4>::execute(c, a_f32, b_f32);
    });
#endif
#endif
    }
};

template<>
struct mfma_f32_f8_f8<32, 32, 16> {
    __device__
    static void execute(
        float (&c)[16],
        const fp8 (&a)[8],
        const fp8 (&b)[8]
    ) {
#ifdef __HIP_DEVICE_COMPILE__
#ifdef __gfx942__
    const auto result = __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
    );
    unroll<0, 16>([&]<int i> {
        c[i] = result[i];
    });
#else
    // Fallback copied from CK, this way we can test on MI210.
    unroll<0, 8>([&]<int k> {
        const auto a_f32 = static_cast<float>(a[k]);
        const auto b_f32 = static_cast<float>(b[k]);
        mfma_f32_f32_f32<32, 32, 2>::execute(c, a_f32, b_f32);
    });
#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> reg_to_matrix_a(int lane, int reg) {
        // Note: reg is the index of the element in
        // the thread's registers. The matrix instruction
        // calculator considers the register the VGRP, so
        // 4 elements. All of the elements should be packed
        const int m = lane % 16;
        const int k = 8 * (lane / 16) + reg;
        return {m, k};
    }

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

    __device__
    static constexpr std::pair<int, int> reg_to_matrix_c(int lane, int reg) {
        const int m = 4 * (lane / 16) + reg;
        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> reg_to_matrix_a(int lane, int reg) {
        // Note: reg is the index of the element in
        // the thread's registers. The matrix instruction
        // calculator considers the register the VGRP, so
        // 4 elements. All of the elements should be packed
        const int m = lane % 32;
        const int k = 8 * (lane / 32) + reg;
        return {m, k};
    }

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

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

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

template <
    int block_size,
    cube block_tile,
    cube warp_tile,
    typename load_type,
    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;

    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 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;

    // size(warp_tile_mn) has to be divisible by the warp size
    constexpr int warp_tile_mn_ipt = divide_exact<warp_tile_mn_items, warp_size>();
    constexpr int warp_tile_mk_ipt = divide_exact<warp_tile_m * warp_tile_k, warp_size>();
    constexpr int warp_tile_nk_ipt = divide_exact<warp_tile_n * warp_tile_k, warp_size>();

    constexpr int c_per_thread = c_total / block_size;
    static_assert(c_per_thread == warp_tiles_mn_per_warp * warp_tile_mn_ipt, "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);

    float c_regs[warp_tiles_mn_per_warp * warp_tile_mn_ipt];
    clear(c_regs);

    __shared__ fp8 block_tile_a[block_tile_m * block_tile_k];
    __shared__ fp8 block_tile_b[block_tile_n * block_tile_k];

    for (int i = 0; i < k; i += block_tile_k) {
        // Load tiles into shared memory
        block_tile_load_fast_linear<
            block_size,
            block_tile_m,
            block_tile_k,
            load_type,
            m_aligned,
            k_aligned
        >(
            block_tile_a, a, m, k, ti_m * block_tile_m, i
        );
        block_tile_load_fast_linear<
            block_size,
            block_tile_n,
            block_tile_k,
            load_type,
            n_aligned,
            k_aligned
        >(
            block_tile_b, b, n, k, ti_n * block_tile_n, i
        );
        __syncthreads();

        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;
            const int flat_wt_base = iwti * warp_tile_mn_ipt;

            float warp_frg_c[warp_tile_mn_ipt];
            clear(warp_frg_c);

            unroll<0, block_tile_k, warp_tile_k>([&]<int wtk_base> {
                // Load fragment A
                fp8 frg_a[warp_tile_mk_ipt];
                unroll<0, warp_tile_mk_ipt>([&]<int mk_reg> {
                    const auto [mfma_im, mfma_ik] = indexer::reg_to_matrix_a(lane, mk_reg);
                    const int bim = wtm * warp_tile_m + mfma_im;
                    const int bik = wtk_base + mfma_ik;
                    frg_a[mk_reg] = block_tile_a[bik * block_tile_m + bim];
                });

                // Load fragment B
                fp8 frg_b[warp_tile_nk_ipt];
                unroll<0, warp_tile_nk_ipt>([&]<int nk_reg> {
                    const auto [mfma_in, mfma_ik] = indexer::reg_to_matrix_b(lane, nk_reg);
                    const int bin = wtn * warp_tile_n + mfma_in;
                    const int bik = wtk_base + mfma_ik;
                    frg_b[nk_reg] = block_tile_b[bik * block_tile_n + bin];
                });

                // Now perform the MFMA based on the warp tile size.
                mfma::execute(
                    warp_frg_c,
                    frg_a,
                    frg_b
                );
            });

            unroll<0, warp_tile_mn_ipt>([&]<int mn_reg> {
                const auto [mfma_im, mfma_in] = indexer::reg_to_matrix_c(lane, mn_reg);
                const int bim = wtm * warp_tile_m + mfma_im;
                const int bin = wtn * warp_tile_n + mfma_in;
                const int im = ti_m * block_tile_m + bim;
                const int in = ti_n * block_tile_n + bin;

                c_regs[flat_wt_base + mn_reg] += warp_frg_c[mn_reg] * as[i / 128 * m + im] * bs[i / 128 * sn + in / 128];
            });
        });

        __syncthreads();
    }

    // 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, warp_tile_mn_ipt>([&]<int iwti, int mn_reg> {
            const auto [mfma_im, mfma_in] = indexer::reg_to_matrix_c(lane, mn_reg);

            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 flat_wt_base = iwti * warp_tile_mn_ipt;

            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(c_regs[flat_wt_base + mn_reg]);

            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,
    typename load_type = uint32_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,
                    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 << ") "
            << 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{32, 32, 128}, cube{2, 2, 8}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{32, 32, 128}, cube{2, 2, 4}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{32, 32, 128}, cube{2, 2, 2}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{32, 32, 64}, cube{2, 2, 4}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{32, 32, 64}, cube{2, 2, 2}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{32, 32, 32}, cube{2, 2, 2}>(a, b, as, bs, c, m, n, k, measure);

    // run_kernel<128, cube{32, 32, 128}, cube{2, 2, 8}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<128, cube{32, 32, 128}, cube{4, 2, 8}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<128, cube{32, 32, 128}, cube{2, 4, 8}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<128, cube{32, 32, 128}, cube{2, 2, 16}>(a, b, as, bs, c, m, n, k, measure);

    // run_kernel<256, cube{64, 64, 64}, cube{4, 4, 4}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{64, 64, 64}, cube{32, 32, 16}, __uint128_t>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{64, 64, 64}, cube{16, 16, 32}, __uint128_t>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{128, 128, 128}, cube{4, 4, 4}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{128, 128, 128}, cube{4, 4, 4}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{128, 128, 128}, cube{8, 8, 8}>(a, b, as, bs, c, m, n, k, measure);

    // run_kernel<256, cube{64, 64, 64}, cube{16, 16, 32}, __uint128_t>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{64, 64, 64}, cube{32, 32, 16}, __uint128_t>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{128, 128, 128}, cube{16, 16, 32}, __uint128_t>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{128, 128, 128}, cube{32, 32, 16}, __uint128_t>(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 else []) + ["-std=c++20"],
    build_directory="/gpumode/amd/fp8/build/" if TESTING 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
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 5153.
- #!POPCORN leaderboard amd-fp8-mm
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 = "GPUMODE_TESTING" in os.environ

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;

template <typename T, typename U>
__host__ __device__
constexpr auto ceil_div(T a, U b) {
    return (a + b - 1) / 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<
    int block_size,
    int block_tile_m,
    int block_tile_n,
    typename load_type
>
__device__
__forceinline__
void block_tile_load_fast_linear(
    // Shared memory destination
    fp8* block_tile_dst,
    // 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 =
        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;

    if (completely_in_bounds) {
        unroll<0, loads_per_thread>([&]<int j> {
            const int i = j * block_size + tid;
            // Make sure that the row to access is the inner dimension to
            // get good caching.
            const int row = i % loads_per_block_tile_m;
            const int col = i / loads_per_block_tile_m;
            const int dst_off = row * sizeof(load_type) + col * block_tile_m;
            const int src_off = row * sizeof(load_type) + col * m;

            // TODO: We might want to make a version which transposes the matrix
            // while loading it. That's for later, though.
            *reinterpret_cast<load_type*>(block_tile_dst + dst_off) =
                *reinterpret_cast<const load_type*>(block_tile_src + src_off);
        });
    } else {
        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 dst_off = row * sizeof(load_type) + col * 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.
            if (src_row < m && src_col < n) {
                *reinterpret_cast<load_type*>(block_tile_dst + dst_off) =
                    *reinterpret_cast<const load_type*>(block_tile_src + src_off);
            } else {
                *reinterpret_cast<load_type*>(block_tile_dst + dst_off) = 0;
            }
        });
    }
}

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

template <>
struct mfma_f32_f32_f32<16, 16, 4> {
    __device__
    static void execute(
        float (&c)[4],
        float a,
        float b
    ) {
        const auto result = __builtin_amdgcn_mfma_f32_16x16x4f32(
            a,
            b,
            std::bit_cast<fp32x4>(c),
            0,
            0,
            0
        );
        unroll<0, 4>([&]<int i> {
            c[i] = result[i];
        });
    }
};

template <>
struct mfma_f32_f32_f32<32, 32, 2> {
    __device__
    static void execute(
        float (&c)[16],
        float a,
        float b
    ) {
        const auto result = __builtin_amdgcn_mfma_f32_32x32x2f32(
            a,
            b,
            std::bit_cast<fp32x16>(c),
            0,
            0,
            0
        );
        unroll<0, 16>([&]<int i> {
            c[i] = result[i];
        });
    }
};

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

template <>
struct mfma_f32_f8_f8<16, 16, 32> {
    __device__
    static void execute(
        float (&c)[4],
        const fp8 (&a)[8],
        const fp8 (&b)[8]
    ) {
#ifdef __HIP_DEVICE_COMPILE__
#ifdef __gfx942__
    const auto result = __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
    );
    unroll<0, 4>([&]<int i> {
        c[i] = result[i];
    });
#else
    // Fallback so we can test on MI210.
    // Apparently the layouts are such that we can just do this.
    unroll<0, 8>([&]<int k> {
        const auto a_f32 = static_cast<float>(a[k]);
        const auto b_f32 = static_cast<float>(b[k]);
        mfma_f32_f32_f32<16, 16, 4>::execute(c, a_f32, b_f32);
    });
#endif
#endif
    }
};

template<>
struct mfma_f32_f8_f8<32, 32, 16> {
    __device__
    static void execute(
        float (&c)[16],
        const fp8 (&a)[8],
        const fp8 (&b)[8]
    ) {
#ifdef __HIP_DEVICE_COMPILE__
#ifdef __gfx942__
    const auto result = __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
    );
    unroll<0, 16>([&]<int i> {
        c[i] = result[i];
    });
#else
    // Fallback copied from CK, this way we can test on MI210.
    unroll<0, 8>([&]<int k> {
        const auto a_f32 = static_cast<float>(a[k]);
        const auto b_f32 = static_cast<float>(b[k]);
        mfma_f32_f32_f32<32, 32, 2>::execute(c, a_f32, b_f32);
    });
#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> reg_to_matrix_a(int lane, int reg) {
        // Note: reg is the index of the element in
        // the thread's registers. The matrix instruction
        // calculator considers the register the VGRP, so
        // 4 elements. All of the elements should be packed
        const int m = lane % 16;
        const int k = 8 * (lane / 16) + reg;
        return {m, k};
    }

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

    __device__
    static constexpr std::pair<int, int> reg_to_matrix_c(int lane, int reg) {
        const int m = 4 * (lane / 16) + reg;
        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> reg_to_matrix_a(int lane, int reg) {
        // Note: reg is the index of the element in
        // the thread's registers. The matrix instruction
        // calculator considers the register the VGRP, so
        // 4 elements. All of the elements should be packed
        const int m = lane % 32;
        const int k = 8 * (lane / 32) + reg;
        return {m, k};
    }

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

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

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

template <
    int block_size,
    cube block_tile,
    cube warp_tile,
    typename load_type
>
__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;

    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 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;

    // size(warp_tile_mn) has to be divisible by the warp size
    constexpr int warp_tile_mn_ipt = divide_exact<warp_tile_mn_items, warp_size>();
    constexpr int warp_tile_mk_ipt = divide_exact<warp_tile_m * warp_tile_k, warp_size>();
    constexpr int warp_tile_nk_ipt = divide_exact<warp_tile_n * warp_tile_k, warp_size>();

    constexpr int c_per_thread = c_total / block_size;
    static_assert(c_per_thread == warp_tiles_mn_per_warp * warp_tile_mn_ipt, "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);

    float c_regs[warp_tiles_mn_per_warp * warp_tile_mn_ipt];
    clear(c_regs);

    __shared__ fp8 block_tile_a[block_tile_m * block_tile_k];
    __shared__ fp8 block_tile_b[block_tile_n * block_tile_k];

    for (int i = 0; i < k; i += block_tile_k) {
        // Load tiles into shared memory
        block_tile_load_fast_linear<block_size, block_tile_m, block_tile_k, load_type>(block_tile_a, a, m, k, ti_m * block_tile_m, i);
        block_tile_load_fast_linear<block_size, block_tile_n, block_tile_k, load_type>(block_tile_b, b, n, k, ti_n * block_tile_n, i);
        __syncthreads();

        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;
            const int flat_wt_base = iwti * warp_tile_mn_ipt;

            float warp_frg_c[warp_tile_mn_ipt];
            clear(warp_frg_c);

            unroll<0, block_tile_k, warp_tile_k>([&]<int wtk_base> {
                // Load fragment A
                fp8 frg_a[warp_tile_mk_ipt];
                unroll<0, warp_tile_mk_ipt>([&]<int mk_reg> {
                    const auto [mfma_im, mfma_ik] = indexer::reg_to_matrix_a(lane, mk_reg);
                    const int bim = wtm * warp_tile_m + mfma_im;
                    const int bik = wtk_base + mfma_ik;
                    frg_a[mk_reg] = block_tile_a[bik * block_tile_m + bim];
                });

                // Load fragment B
                fp8 frg_b[warp_tile_nk_ipt];
                unroll<0, warp_tile_nk_ipt>([&]<int nk_reg> {
                    const auto [mfma_in, mfma_ik] = indexer::reg_to_matrix_b(lane, nk_reg);
                    const int bin = wtn * warp_tile_n + mfma_in;
                    const int bik = wtk_base + mfma_ik;
                    frg_b[nk_reg] = block_tile_b[bik * block_tile_n + bin];
                });

                // Now perform the MFMA based on the warp tile size.
                mfma::execute(
                    warp_frg_c,
                    frg_a,
                    frg_b
                );
            });

            unroll<0, warp_tile_mn_ipt>([&]<int mn_reg> {
                const auto [mfma_im, mfma_in] = indexer::reg_to_matrix_c(lane, mn_reg);
                const int bim = wtm * warp_tile_m + mfma_im;
                const int bin = wtn * warp_tile_n + mfma_in;
                const int im = ti_m * block_tile_m + bim;
                const int in = ti_n * block_tile_n + bin;

                c_regs[flat_wt_base + mn_reg] += warp_frg_c[mn_reg] * as[i / 128 * m + im] * bs[i / 128 * sn + in / 128];
            });
        });

        __syncthreads();
    }

    // Write out C
    // This should access tile C in the same order as in the matmul loop!
    unroll2d<warp_tiles_mn_per_warp, warp_tile_mn_ipt>([&]<int iwti, int mn_reg> {
        const auto [mfma_im, mfma_in] = indexer::reg_to_matrix_c(lane, mn_reg);

        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 flat_wt_base = iwti * warp_tile_mn_ipt;

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

        const int im = ti_m * block_tile_m + bim;
        const int in = ti_n * block_tile_n + bin;

        if (im < m && in < n) {
            c[im * n + in] = bf16_from_fp32(c_regs[flat_wt_base + mn_reg]);
        }
    });
}

template<
    int block_size,
    cube block_tile,
    cube warp_tile,
    typename load_type = uint32_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));
    }

    int batch = 1;
    for (int i = 0; i < batch; ++i) {
        kernel<
            block_size,
            block_tile,
            warp_tile,
            load_type
        ><<<
            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));
        ms /= batch;
        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 << ") "
            << 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{32, 32, 128}, cube{2, 2, 8}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{32, 32, 128}, cube{2, 2, 4}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{32, 32, 128}, cube{2, 2, 2}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{32, 32, 64}, cube{2, 2, 4}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{32, 32, 64}, cube{2, 2, 2}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{32, 32, 32}, cube{2, 2, 2}>(a, b, as, bs, c, m, n, k, measure);

    // run_kernel<128, cube{32, 32, 128}, cube{2, 2, 8}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<128, cube{32, 32, 128}, cube{4, 2, 8}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<128, cube{32, 32, 128}, cube{2, 4, 8}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<128, cube{32, 32, 128}, cube{2, 2, 16}>(a, b, as, bs, c, m, n, k, measure);

    // run_kernel<256, cube{64, 64, 64}, cube{4, 4, 4}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{64, 64, 64}, cube{32, 32, 16}, __uint128_t>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{64, 64, 64}, cube{16, 16, 32}, __uint128_t>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{128, 128, 128}, cube{4, 4, 4}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{128, 128, 128}, cube{4, 4, 4}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{128, 128, 128}, cube{8, 8, 8}>(a, b, as, bs, c, m, n, k, measure);

    // run_kernel<256, cube{64, 64, 64}, cube{16, 16, 32}, __uint128_t>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{64, 64, 64}, cube{32, 32, 16}, __uint128_t>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{128, 128, 128}, cube{16, 16, 32}, __uint128_t>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{128, 128, 128}, cube{32, 32, 16}, __uint128_t>(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 else []) + ["-std=c++20"],
    build_directory="/gpumode/amd/fp8/build/" if TESTING 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 = "GPUMODE_TESTING" in os.environ

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;

template <typename T, typename U>
__host__ __device__
constexpr auto ceil_div(T a, U b) {
    return (a + b - 1) / 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 block_size,
    int block_tile_m,
    int block_tile_n,
    typename load_type,
    bool m_aligned = false,
    bool n_aligned = false
>
__device__
__forceinline__
void block_tile_load_fast_linear(
    // Shared memory destination
    fp8* block_tile_dst,
    // 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;

    if (completely_in_bounds) {
        unroll<0, loads_per_thread>([&]<int j> {
            const int i = j * block_size + tid;
            // Make sure that the row to access is the inner dimension to
            // get good caching.
            const int row = i % loads_per_block_tile_m;
            const int col = i / loads_per_block_tile_m;
            const int dst_off = row * sizeof(load_type) + col * block_tile_m;
            const int src_off = row * sizeof(load_type) + col * m;

            // TODO: We might want to make a version which transposes the matrix
            // while loading it. That's for later, though.
            *reinterpret_cast<load_type*>(block_tile_dst + dst_off) =
                *reinterpret_cast<const load_type*>(block_tile_src + src_off);
        });
    } else {
        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 dst_off = row * sizeof(load_type) + col * 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.
            if ((m_aligned || src_row < m) && (n_aligned || src_col < n)) {
                *reinterpret_cast<load_type*>(block_tile_dst + dst_off) =
                    *reinterpret_cast<const load_type*>(block_tile_src + src_off);
            } else {
                *reinterpret_cast<load_type*>(block_tile_dst + dst_off) = 0;
            }
        });
    }
}

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

template <>
struct mfma_f32_f32_f32<16, 16, 4> {
    __device__
    static void execute(
        float (&c)[4],
        float a,
        float b
    ) {
        const auto result = __builtin_amdgcn_mfma_f32_16x16x4f32(
            a,
            b,
            std::bit_cast<fp32x4>(c),
            0,
            0,
            0
        );
        unroll<0, 4>([&]<int i> {
            c[i] = result[i];
        });
    }
};

template <>
struct mfma_f32_f32_f32<32, 32, 2> {
    __device__
    static void execute(
        float (&c)[16],
        float a,
        float b
    ) {
        const auto result = __builtin_amdgcn_mfma_f32_32x32x2f32(
            a,
            b,
            std::bit_cast<fp32x16>(c),
            0,
            0,
            0
        );
        unroll<0, 16>([&]<int i> {
            c[i] = result[i];
        });
    }
};

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

template <>
struct mfma_f32_f8_f8<16, 16, 32> {
    __device__
    static void execute(
        float (&c)[4],
        const fp8 (&a)[8],
        const fp8 (&b)[8]
    ) {
#ifdef __HIP_DEVICE_COMPILE__
#ifdef __gfx942__
    const auto result = __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
    );
    unroll<0, 4>([&]<int i> {
        c[i] = result[i];
    });
#else
    // Fallback so we can test on MI210.
    // Apparently the layouts are such that we can just do this.
    unroll<0, 8>([&]<int k> {
        const auto a_f32 = static_cast<float>(a[k]);
        const auto b_f32 = static_cast<float>(b[k]);
        mfma_f32_f32_f32<16, 16, 4>::execute(c, a_f32, b_f32);
    });
#endif
#endif
    }
};

template<>
struct mfma_f32_f8_f8<32, 32, 16> {
    __device__
    static void execute(
        float (&c)[16],
        const fp8 (&a)[8],
        const fp8 (&b)[8]
    ) {
#ifdef __HIP_DEVICE_COMPILE__
#ifdef __gfx942__
    const auto result = __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
    );
    unroll<0, 16>([&]<int i> {
        c[i] = result[i];
    });
#else
    // Fallback copied from CK, this way we can test on MI210.
    unroll<0, 8>([&]<int k> {
        const auto a_f32 = static_cast<float>(a[k]);
        const auto b_f32 = static_cast<float>(b[k]);
        mfma_f32_f32_f32<32, 32, 2>::execute(c, a_f32, b_f32);
    });
#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> reg_to_matrix_a(int lane, int reg) {
        // Note: reg is the index of the element in
        // the thread's registers. The matrix instruction
        // calculator considers the register the VGRP, so
        // 4 elements. All of the elements should be packed
        const int m = lane % 16;
        const int k = 8 * (lane / 16) + reg;
        return {m, k};
    }

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

    __device__
    static constexpr std::pair<int, int> reg_to_matrix_c(int lane, int reg) {
        const int m = 4 * (lane / 16) + reg;
        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> reg_to_matrix_a(int lane, int reg) {
        // Note: reg is the index of the element in
        // the thread's registers. The matrix instruction
        // calculator considers the register the VGRP, so
        // 4 elements. All of the elements should be packed
        const int m = lane % 32;
        const int k = 8 * (lane / 32) + reg;
        return {m, k};
    }

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

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

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

template <
    int block_size,
    cube block_tile,
    cube warp_tile,
    typename load_type,
    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;

    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 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;

    // size(warp_tile_mn) has to be divisible by the warp size
    constexpr int warp_tile_mn_ipt = divide_exact<warp_tile_mn_items, warp_size>();
    constexpr int warp_tile_mk_ipt = divide_exact<warp_tile_m * warp_tile_k, warp_size>();
    constexpr int warp_tile_nk_ipt = divide_exact<warp_tile_n * warp_tile_k, warp_size>();

    constexpr int c_per_thread = c_total / block_size;
    static_assert(c_per_thread == warp_tiles_mn_per_warp * warp_tile_mn_ipt, "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);

    float c_regs[warp_tiles_mn_per_warp * warp_tile_mn_ipt];
    clear(c_regs);

    __shared__ fp8 block_tile_a[block_tile_m * block_tile_k];
    __shared__ fp8 block_tile_b[block_tile_n * block_tile_k];

    for (int i = 0; i < k; i += block_tile_k) {
        // Load tiles into shared memory
        block_tile_load_fast_linear<
            block_size,
            block_tile_m,
            block_tile_k,
            load_type,
            m_aligned,
            k_aligned
        >(
            block_tile_a, a, m, k, ti_m * block_tile_m, i
        );
        block_tile_load_fast_linear<
            block_size,
            block_tile_n,
            block_tile_k,
            load_type,
            n_aligned,
            k_aligned
        >(
            block_tile_b, b, n, k, ti_n * block_tile_n, i
        );
        __syncthreads();

        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;
            const int flat_wt_base = iwti * warp_tile_mn_ipt;

            float warp_frg_c[warp_tile_mn_ipt];
            clear(warp_frg_c);

            unroll<0, block_tile_k, warp_tile_k>([&]<int wtk_base> {
                // Load fragment A
                fp8 frg_a[warp_tile_mk_ipt];
                unroll<0, warp_tile_mk_ipt>([&]<int mk_reg> {
                    const auto [mfma_im, mfma_ik] = indexer::reg_to_matrix_a(lane, mk_reg);
                    const int bim = wtm * warp_tile_m + mfma_im;
                    const int bik = wtk_base + mfma_ik;
                    frg_a[mk_reg] = block_tile_a[bik * block_tile_m + bim];
                });

                // Load fragment B
                fp8 frg_b[warp_tile_nk_ipt];
                unroll<0, warp_tile_nk_ipt>([&]<int nk_reg> {
                    const auto [mfma_in, mfma_ik] = indexer::reg_to_matrix_b(lane, nk_reg);
                    const int bin = wtn * warp_tile_n + mfma_in;
                    const int bik = wtk_base + mfma_ik;
                    frg_b[nk_reg] = block_tile_b[bik * block_tile_n + bin];
                });

                // Now perform the MFMA based on the warp tile size.
                mfma::execute(
                    warp_frg_c,
                    frg_a,
                    frg_b
                );
            });

            unroll<0, warp_tile_mn_ipt>([&]<int mn_reg> {
                const auto [mfma_im, mfma_in] = indexer::reg_to_matrix_c(lane, mn_reg);
                const int bim = wtm * warp_tile_m + mfma_im;
                const int bin = wtn * warp_tile_n + mfma_in;
                const int im = ti_m * block_tile_m + bim;
                const int in = ti_n * block_tile_n + bin;

                c_regs[flat_wt_base + mn_reg] += warp_frg_c[mn_reg] * as[i / 128 * m + im] * bs[i / 128 * sn + in / 128];
            });
        });

        __syncthreads();
    }

    // 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, warp_tile_mn_ipt>([&]<int iwti, int mn_reg> {
            const auto [mfma_im, mfma_in] = indexer::reg_to_matrix_c(lane, mn_reg);

            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 flat_wt_base = iwti * warp_tile_mn_ipt;

            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(c_regs[flat_wt_base + mn_reg]);

            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,
    typename load_type = uint32_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,
                    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 << ") "
            << 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{32, 32, 128}, cube{2, 2, 8}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{32, 32, 128}, cube{2, 2, 4}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{32, 32, 128}, cube{2, 2, 2}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{32, 32, 64}, cube{2, 2, 4}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{32, 32, 64}, cube{2, 2, 2}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{32, 32, 32}, cube{2, 2, 2}>(a, b, as, bs, c, m, n, k, measure);

    // run_kernel<128, cube{32, 32, 128}, cube{2, 2, 8}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<128, cube{32, 32, 128}, cube{4, 2, 8}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<128, cube{32, 32, 128}, cube{2, 4, 8}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<128, cube{32, 32, 128}, cube{2, 2, 16}>(a, b, as, bs, c, m, n, k, measure);

    // run_kernel<256, cube{64, 64, 64}, cube{4, 4, 4}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{64, 64, 64}, cube{32, 32, 16}, __uint128_t>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{64, 64, 64}, cube{16, 16, 32}, __uint128_t>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{128, 128, 128}, cube{4, 4, 4}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{128, 128, 128}, cube{4, 4, 4}>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{128, 128, 128}, cube{8, 8, 8}>(a, b, as, bs, c, m, n, k, measure);

    // run_kernel<256, cube{64, 64, 64}, cube{16, 16, 32}, __uint128_t>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{64, 64, 64}, cube{32, 32, 16}, __uint128_t>(a, b, as, bs, c, m, n, k, measure);
    // run_kernel<256, cube{128, 128, 128}, cube{16, 16, 32}, __uint128_t>(a, b, as, bs, c, m, n, k, measure);
    run_kernel<256, cube{128, 128, 128}, cube{32, 32, 16}, __uint128_t>(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 else []) + ["-std=c++20"],
    build_directory="/gpumode/amd/fp8/build/" if TESTING 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
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