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submission 23139

KernelBot user 423 · python · License unknown
Kernel source · 1 lines ↓

Use it

Vendorable · source mirrored · license unknownView source →

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

fp8.py
curl "https://kernelindex.com/api/v1/implementations/kernelbot-amd-fp8-mm-23139?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, 512]
AMD Instinct MI300X
43.9µs
#38 of 98
2025-05-16
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 256]
AMD Instinct MI300X
45.9µs
#44 of 98
2025-05-16
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 1536]
AMD Instinct MI300X
66.8µs
#47 of 98
2025-05-16
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 256]
AMD Instinct MI300X
114.4µs
#46 of 98
2025-05-16
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 512]
AMD Instinct MI300X
119.5µs
#41 of 98
2025-05-16
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 2048]
AMD Instinct MI300X
129.4µs
#46 of 98
2025-05-16
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 2304]
AMD Instinct MI300X
139.8µs
#45 of 98
2025-05-16
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=576 · seed=12346
AMD Instinct MI300X
180.5µs
#69 of 98
2025-05-16
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=512 · seed=6563
AMD Instinct MI300X
180.6µs
#69 of 98
2025-05-16
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=1536 · seed=8135
AMD Instinct MI300X
187.3µs
#62 of 98
2025-05-16
Run →
Show all 18 measurements ›
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 1536]
AMD Instinct MI300X
213.5µs
#62 of 98
2025-05-16
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=512 · seed=12341
AMD Instinct MI300X
231.5µs
#54 of 98
2025-05-16
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=576 · seed=9863
AMD Instinct MI300X
233.6µs
#48 of 98
2025-05-16
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=4608 · seed=7531
AMD Instinct MI300X
257.4µs
#52 of 98
2025-05-16
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=1536 · seed=6543
AMD Instinct MI300X
457.2µs
#57 of 98
2025-05-16
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 2048]
AMD Instinct MI300X
561.4µs
#62 of 98
2025-05-16
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 2304]
AMD Instinct MI300X
628.6µs
#60 of 98
2025-05-16
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=4608 · seed=65436
AMD Instinct MI300X
1.31ms
#63 of 98
2025-05-16
Run →

Reported · How evidence levels are derived →

Source and license

sourceavailable
revision digestsha256:450509d20247651e70f7bb6befdaa43045ff426e0291a7e85073d651e8002dcf
license declaredunknown
license concludedunknown
imported2026-08-15

Kernel source

fp8.py1 lines
#!POPCORN leaderboard amd-fp8-mm
#!POPCORN gpus MI300

import os
from task import input_t, output_t
from torch.utils.cpp_extension import load_inline

os.environ["CXX"] = "clang++"

src = r"""
#include <hip/amd_detail/amd_hip_bf16.h>
#include <hip/amd_detail/amd_hip_fp8.h>
#include <hip/hip_runtime.h>

__host__ __device__ __forceinline__ uint32_t cdiv(uint32_t a, uint32_t b) {
    return (a + b - 1) / b;
}

static constexpr int FP8_PER_LOAD = 16;
static constexpr int SCALE_SIZE = 128;
static constexpr int WAVEFRONT_SIZE = 64;

template <const uint32_t BLOCK, const uint32_t NUMBER_OF_THREADS>
__global__ void fp8_kernel(
    const __hip_fp8_e4m3_fnuz *A,
    const __hip_fp8_e4m3_fnuz *B,
    const float *A_scale,
    const float *B_scale,
    __hip_bfloat16 *C,
    uint32_t M, uint32_t K, uint32_t N) {
    using floatx16 = __attribute__((__vector_size__(16 * sizeof(float)))) float;

    static constexpr uint32_t CHUNK = BLOCK / FP8_PER_LOAD;

    uint32_t rowOffset = blockIdx.x * BLOCK;
    uint32_t colOffset = blockIdx.y * BLOCK;

    uint32_t innerCol = (threadIdx.x % CHUNK) * FP8_PER_LOAD;
    uint32_t innerRow = threadIdx.x / CHUNK;

    uint32_t warpColOffset = ((threadIdx.x / WAVEFRONT_SIZE) % (BLOCK / 32)) * 32;
    uint32_t warpRowOffset = ((threadIdx.x / WAVEFRONT_SIZE) / (BLOCK / 32)) * 32;
    uint32_t warpX = threadIdx.x % 32;
    uint32_t warpY = (threadIdx.x % WAVEFRONT_SIZE) / 32;

    __shared__ __hip_fp8_e4m3_fnuz As[BLOCK * BLOCK];
    __shared__ __hip_fp8_e4m3_fnuz Bs[BLOCK * BLOCK];
    __shared__ float Ws[BLOCK];
    float b_scale = 0;

    __hip_fp8_e4m3_fnuz a[8];
    __hip_fp8_e4m3_fnuz b[8];
    floatx16 d = {0};
    floatx16 c = {0};

    for (uint32_t tileOffset = 0; tileOffset < K; tileOffset += BLOCK) {
        b_scale = B_scale[(tileOffset / SCALE_SIZE) * cdiv(N, SCALE_SIZE) + (colOffset / SCALE_SIZE)];

        if (threadIdx.x < BLOCK) {
            Ws[threadIdx.x] = A_scale[(tileOffset / SCALE_SIZE) * M + (rowOffset + threadIdx.x)];
        }

        uint32_t innerRowOffset = tileOffset + innerRow;
        uint32_t innerColOffsetA = rowOffset + innerCol;
        uint32_t innerColOffsetB = colOffset + innerCol;
        if ((innerColOffsetA) < M) {
            *reinterpret_cast<float4 *>(&As[innerRow * BLOCK + innerCol]) =
                *reinterpret_cast<const float4 *>(&A[(innerRowOffset)*M + (innerColOffsetA)]);
        }

        if ((innerColOffsetB) < N) {
            *reinterpret_cast<float4 *>(&Bs[innerRow * BLOCK + innerCol]) =
                *reinterpret_cast<const float4 *>(&B[(innerRowOffset)*N + (innerColOffsetB)]);
        }

        __syncthreads();
        c = {0};
        for (uint32_t BlockOffset = 0; BlockOffset < BLOCK; BlockOffset += 16) {
#pragma unroll
            for (uint32_t i = 0; i < 8; ++i) {
                a[i] = As[(BlockOffset + warpY * 8 + i) * BLOCK + warpRowOffset + warpX];
                b[i] = Bs[(BlockOffset + warpY * 8 + i) * BLOCK + warpColOffset + warpX];
            }

            c = __builtin_amdgcn_mfma_f32_32x32x16_fp8_fp8(
                *reinterpret_cast<long *>(a), *reinterpret_cast<long *>(b), c, 0, 0, 0);
        }

        for (uint32_t j = 0; j < 4; ++j) {
            for (uint32_t i = 0; i < 4; ++i) {
                d[i + j * 4] += c[i + j * 4] * Ws[warpRowOffset + j * 8 + warpY * 4 + i] * b_scale;
            }
        }

        __syncthreads();
    }

    for (uint32_t j = 0; j < 4; ++j) {
        for (uint32_t i = 0; i < 4; ++i) {
            const uint32_t row = rowOffset + warpRowOffset + j * 8 + warpY * 4 + i;
            const uint32_t col = colOffset + warpColOffset + warpX;
            if (row < M && col < N) {
                C[row * N + col] = (__hip_bfloat16)d[i + j * 4];
            }
        }
    }
}

template <const uint32_t BLOCK, const uint32_t NUMBER_OF_THREADS, const uint32_t SHARED_MEMORY_SIZE>
__global__ void fp8_kernel_large(
    const __hip_fp8_e4m3_fnuz *A,
    const __hip_fp8_e4m3_fnuz *B,
    const float *A_scale,
    const float *B_scale,
    __hip_bfloat16 *C,
    uint32_t M, uint32_t K, uint32_t N) {
    using floatx16 = __attribute__((__vector_size__(16 * sizeof(float)))) float;

    static constexpr uint32_t CHUNK = BLOCK / FP8_PER_LOAD; // A block is split into CHUNK chunks based on the quantity of FP8s that can be loaded in one go

    uint32_t tileOffsetRow = blockIdx.x * BLOCK;     // How many blocks of m have been processed
    uint32_t tileOffsetCol = blockIdx.y * BLOCK * 2; // How many blocks of n have been processed, 2 blocks of n are processed in one kernel launch

    uint32_t sharedMemoryRow = threadIdx.x / CHUNK;
    uint32_t sharedMemoryCol = (threadIdx.x % CHUNK) * FP8_PER_LOAD;

    uint32_t warpRowOffset = ((threadIdx.x / WAVEFRONT_SIZE) / (BLOCK / 32)) * 32;
    uint32_t warpColOffset = ((threadIdx.x / WAVEFRONT_SIZE) % (BLOCK / 32)) * 32;
    uint32_t warpX = threadIdx.x % 32;
    uint32_t warpY = (threadIdx.x % WAVEFRONT_SIZE) / 32;

    __shared__ __hip_fp8_e4m3_fnuz As[SHARED_MEMORY_SIZE];
    __shared__ __hip_fp8_e4m3_fnuz Bs[SHARED_MEMORY_SIZE * 2];
    __shared__ float Ws[BLOCK];
    float b_scale = 0;

    __hip_fp8_e4m3_fnuz a[8];
    __hip_fp8_e4m3_fnuz b[8];
    floatx16 c1 = {0};
    floatx16 d1 = {0};

    floatx16 c2 = {0};
    floatx16 d2 = {0};

    for (uint32_t kTileOffset = 0; kTileOffset < K; kTileOffset += BLOCK) {
        b_scale = B_scale[(kTileOffset / SCALE_SIZE) * cdiv(N, SCALE_SIZE) + (tileOffsetCol / SCALE_SIZE)];

        if (threadIdx.x < BLOCK) {
            Ws[threadIdx.x] = A_scale[(kTileOffset / SCALE_SIZE) * M + (tileOffsetRow + threadIdx.x)];
        }

        uint32_t mainMemoryCol = kTileOffset + sharedMemoryRow; // This can seem confusing, but we are loading in columns from main memory and turning them into rows in shared memory
        uint32_t mainMemoryRowA = tileOffsetRow + sharedMemoryCol;
        uint32_t mainMemoryRowB = tileOffsetCol + sharedMemoryCol;
        if ((mainMemoryRowA) < M) {
            *reinterpret_cast<float4 *>(&As[sharedMemoryRow * BLOCK + sharedMemoryCol]) =
                *reinterpret_cast<const float4 *>(&A[(mainMemoryCol)*M + (mainMemoryRowA)]);
        }

        if ((mainMemoryRowB) < N) {
            *reinterpret_cast<float4 *>(&Bs[sharedMemoryRow * BLOCK + sharedMemoryCol]) =
                *reinterpret_cast<const float4 *>(&B[(mainMemoryCol)*N + (mainMemoryRowB)]);
        }

        if ((mainMemoryRowB + BLOCK) < N) {
            *reinterpret_cast<float4 *>(&Bs[sharedMemoryRow * BLOCK + sharedMemoryCol + SHARED_MEMORY_SIZE]) =
                *reinterpret_cast<const float4 *>(&B[(mainMemoryCol)*N + (mainMemoryRowB + BLOCK)]);
        }

        __syncthreads();
        c1 = {0};
        c2 = {0};
        for (uint32_t BlockOffset = 0; BlockOffset < BLOCK; BlockOffset += 16) {
#pragma unroll
            for (uint32_t i = 0; i < 8; ++i) {
                a[i] = As[(BlockOffset + warpY * 8 + i) * BLOCK + warpRowOffset + warpX];
                b[i] = Bs[(BlockOffset + warpY * 8 + i) * BLOCK + warpColOffset + warpX];
            }

            c1 = __builtin_amdgcn_mfma_f32_32x32x16_fp8_fp8(
                *reinterpret_cast<long *>(a), *reinterpret_cast<long *>(b), c1, 0, 0, 0);

            for (uint32_t i = 0; i < 8; ++i) {
                b[i] = Bs[(BlockOffset + warpY * 8 + i) * BLOCK + warpColOffset + warpX + SHARED_MEMORY_SIZE];
            }

            c2 = __builtin_amdgcn_mfma_f32_32x32x16_fp8_fp8(
                *reinterpret_cast<long *>(a), *reinterpret_cast<long *>(b), c2, 0, 0, 0);
        }

        for (uint32_t j = 0; j < 4; ++j) {
            for (uint32_t i = 0; i < 4; ++i) {
                d1[i + j * 4] += c1[i + j * 4] * Ws[warpRowOffset + j * 8 + warpY * 4 + i] * b_scale;
                d2[i + j * 4] += c2[i + j * 4] * Ws[warpRowOffset + j * 8 + warpY * 4 + i] * b_scale;
            }
        }

        __syncthreads();
    }

    for (uint32_t j = 0; j < 4; ++j) {
        for (uint32_t i = 0; i < 4; ++i) {
            const uint32_t row = tileOffsetRow + warpRowOffset + j * 8 + warpY * 4 + i;
            const uint32_t col = tileOffsetCol + warpColOffset + warpX;
            if (row < M && col < N) {
                C[row * N + col] = (__hip_bfloat16)d1[i + j * 4];
                if (col + BLOCK < N) {
                    C[row * N + col + BLOCK] = (__hip_bfloat16)d2[i + j * 4];
                }
            }
        }
    }
}

void run(
    const uintptr_t a_ptr,
    const uintptr_t b_ptr,
    const uintptr_t a_scale_ptr,
    const uintptr_t b_scale_ptr,
    const uintptr_t c_ptr,
    const uint32_t M,
    const uint32_t N,
    const uint32_t K) {
    const auto *A = reinterpret_cast<const __hip_fp8_e4m3_fnuz *>(a_ptr);
    const auto *B = reinterpret_cast<const __hip_fp8_e4m3_fnuz *>(b_ptr);
    const auto *A_scale = reinterpret_cast<const float *>(a_scale_ptr);
    const auto *B_scale = reinterpret_cast<const float *>(b_scale_ptr);
    auto *C = reinterpret_cast<__hip_bfloat16 *>(c_ptr);

    if (M * N < 3000000) {
        const uint32_t BLOCK = 64;

        const uint32_t NUMBER_OF_THREADS = (BLOCK * BLOCK) / FP8_PER_LOAD;

        dim3 threadsPerBlock(NUMBER_OF_THREADS);
        dim3 numBlocks(cdiv(M, BLOCK), cdiv(N, BLOCK));

        fp8_kernel<BLOCK, NUMBER_OF_THREADS><<<numBlocks, threadsPerBlock>>>(
            A,
            B,
            A_scale,
            B_scale,
            C,
            M, K, N);
    } else if (M * N < 7000000) {
        const uint32_t BLOCK = 128;

        const uint32_t NUMBER_OF_THREADS = (BLOCK * BLOCK) / FP8_PER_LOAD;

        dim3 threadsPerBlock(NUMBER_OF_THREADS);
        dim3 numBlocks(cdiv(M, BLOCK), cdiv(N, BLOCK));

        fp8_kernel<BLOCK, NUMBER_OF_THREADS><<<numBlocks, threadsPerBlock>>>(
            A,
            B,
            A_scale,
            B_scale,
            C,
            M, K, N);
    } else {
        const uint32_t BLOCK = 64;
        const uint32_t SHARED_MEMORY_SIZE = BLOCK * BLOCK;

        const uint32_t NUMBER_OF_THREADS = (BLOCK * BLOCK) / FP8_PER_LOAD;

        dim3 threadsPerBlock(NUMBER_OF_THREADS);
        dim3 numBlocks(cdiv(M, BLOCK), cdiv(N, BLOCK * 2));

        fp8_kernel_large<BLOCK, NUMBER_OF_THREADS, SHARED_MEMORY_SIZE><<<numBlocks, threadsPerBlock>>>(
            A,
            B,
            A_scale,
            B_scale,
            C,
            M, K, N);
    }
}
"""

postfix = """
#include <pybind11/pybind11.h>

PYBIND11_MODULE(fp8, m) {
  m.def("fp8", &run, "HIP kernel");
}
"""

full = src + postfix

hip_module = load_inline(
    name="fp8",
    cpp_sources="",
    cuda_sources=full.replace('@', chr(92)),
    with_cuda=True,
    verbose=True,
    extra_cuda_cflags=["-Ofast", "--offload-arch=gfx942", "-std=c++20", "-ffp-contract=fast"],
    no_implicit_headers=True,
)

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
    """

    a, b, a_scale, b_scale, c = data

    m = a.shape[0]
    n = b.shape[0]
    k = a.shape[1]

    hip_module.fp8(
        a.data_ptr(),
        b.data_ptr(),
        a_scale.data_ptr(),
        b_scale.data_ptr(),
        c.data_ptr(),
        m,
        n,
        k,
    )

    return c


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

Best evidence level for this revision: reported

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