submission 7548
KernelBot user 376 · python · License unknown
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Vendorable · source mirrored · license unknownView source →
No package. Vendor the mirrored source: 1 lines, June 9 Researcher Reciprocity License v1.0.
baguette.py
curl "https://kernelindex.com/api/v1/implementations/kernelbot-amd-fp8-mm-7548?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=576 · seed=12346
AMD Instinct MI300X
160.1µs
#65 of 98
2025-04-23
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=512 · seed=6563
AMD Instinct MI300X
163.5µs
#66 of 98
2025-04-23
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=1536 · seed=8135
AMD Instinct MI300X
165.0µs
#50 of 98
2025-04-23
Show all 18 measurements ›Showing all 18 measurements ⌄
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=512 · seed=12341
AMD Instinct MI300X
171.0µs
#33 of 98
2025-04-23
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=576 · seed=9863
AMD Instinct MI300X
180.6µs
#32 of 98
2025-04-23
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=4608 · seed=7531
AMD Instinct MI300X
198.0µs
#29 of 98
2025-04-23
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=1536 · seed=6543
AMD Instinct MI300X
389.3µs
#46 of 98
2025-04-23
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=4608 · seed=65436
AMD Instinct MI300X
1.20ms
#53 of 98
2025-04-23
Reported · How evidence levels are derived →
Source and license
sourceavailable
revision digestsha256:b41c15e4c345d76bdeadb5f6b829c90145d2189b4b7337cf4877f575feef15cd
license declaredunknown
license concludedunknown
imported2026-08-15
Kernel source
baguette.py1 lines
#!POPCORN leaderboard amd-fp8-mm

# This is a submission template for popcorn leaderboard 'amd-fp8-mm'.
# Your task is as follows:
# > 
# > You will implement a custom fp8-blockwise matmul kernel optimized for MI300.
# > You will be given single-precision scaling factors for your matrices.
# > The shapes of all outer and inner dimensions of tensors are from DeepSeek-R1.
# > To be explicit, you will be given a tuple of tensors:
# > ```
# > (a, b, a_scale, b_scale, c)
# > ```
# > where `a` and `b` are the input matrices, `a_scale` and `b_scale` are the scaling factors for `a` and `b` respectively,
# > and `c` is the output matrix:
# > * `a` is M x K in column-major order in e4m3fnuz
# > * `b` is N x K in column-major order in e4m3fnuz
# > * `a_scale` is M x K in column-major order in fp32
# > * `b_scale` is N x K in column-major order in fp32
# > * `c` is M x N in ROW-major order in bf16
# > 
# > Matrix sizes `m` and `n` are divisible by 64, `k` is divisible by 128.
# > 
# > The ranking criteria is the geometric mean of the benchmark results.
# > 
# > For the grand price, your kernel will be evaluated against the speed of light analysis
# > and the solution closest to the speed of light will be awarded the grand price.
# > ```
# > The speed of light analysis is:
# >  M       N       K     time[us]
# > 1024    1536    7168      8.63
# > 1024    4608    7168     25.89
# > 6144    1536    7168     51.78
# > 6144    4608    7168    155.30
# > 1024    7168     256      3.17
# > 6144    7168     256     17.27
# > ```
# The deadline for this leaderboard is 2025-05-27 00:00:00+00:00

# You can automatically route this file to specific GPUs by adding a line
# `#!POPCORN gpus <GPUs>` to the header of this file.
# Happy hacking!

# This script provides a template for using load_inline to run a HIP kernel for
from torch.utils.cpp_extension import load_inline
from task import input_t, output_t
CPP_WRAPPER = """
void fp8_mm(torch::Tensor a, torch::Tensor b, torch::Tensor as, torch::Tensor bs, torch::Tensor c);
"""

CUDA_SRC = """
#include <hip/amd_detail/amd_hip_fp8.h>
#include <hip/amd_detail/amd_hip_bf16.h>

typedef __hip_fp8_e4m3_fnuz fp8;

#define WARP_SIZE 64
using vec4f = __attribute__((__vector_size__(4 * sizeof(float)))) float;
#define N_WARP_X_DEF 4
#define N_WARP_Y_DEF 2
#define TILE_SIZE_DEF 128

__device__ void matmul16x16(const __hip_fp8_e4m3_fnuz *a,
                            const __hip_fp8_e4m3_fnuz *b,
                            vec4f &c,
                            int m, int n)
{
    int tid = threadIdx.x % WARP_SIZE;
    auto packedA = reinterpret_cast<const uint64_t*>(a+(tid % 16)*(TILE_SIZE_DEF+8) + (tid / 16) * 8 )[0];
    auto packedB = reinterpret_cast<const uint64_t*>(b+(tid % 16)*(TILE_SIZE_DEF+8) + (tid / 16) * 8 )[0];
    c = __builtin_amdgcn_mfma_f32_16x16x32_fp8_fp8(packedA, packedB, c, 0, 0, 0);

}
__global__ void __launch_bounds__(N_WARP_X_DEF *N_WARP_Y_DEF * WARP_SIZE) custom_kernel(const fp8 *a,
                                                                                 const fp8 *b,
                                                                                 const float *as, const float *bs,
                                                                                 __hip_bfloat16 *c, int M, int N, int K)
{
    int tid = threadIdx.x;
    int laneId = tid % WARP_SIZE;
    float result = 0;
        
    constexpr int TILE_SIZE = TILE_SIZE_DEF;
    constexpr int NBWARPS_X = N_WARP_X_DEF;
    constexpr int NBWARPS_Y = N_WARP_Y_DEF;
    constexpr int BLOCK_DIM = NBWARPS_X * NBWARPS_Y * WARP_SIZE;
    constexpr int nbReads = TILE_SIZE * TILE_SIZE / BLOCK_DIM;

    int SN = (N + 128 - 1) / 128;

    int warpId = threadIdx.x / WARP_SIZE;
    // 256 threads organized in 2x2 warps
    int warpIdx = warpId / NBWARPS_Y;
    int warpIdy = warpId % NBWARPS_Y;

    __shared__ fp8 s_a[TILE_SIZE][TILE_SIZE+8];
    __shared__ fp8 s_b[TILE_SIZE][TILE_SIZE+8];

    // Every Warp hold compute 4x4 16x16 tile -> WARP Tile size is 64x64
    //  TODO: See if 2x2 is better...
    constexpr int WARP_TILE_SIZE_X = TILE_SIZE / NBWARPS_X / 16;
    constexpr int WARP_TILE_SIZE_Y = TILE_SIZE / NBWARPS_Y / 16;
    vec4f c_s[WARP_TILE_SIZE_X][WARP_TILE_SIZE_Y] = {0};

    for (int kId = 0; kId < K; kId += TILE_SIZE)
    {
        // nb rows read per block
        int nbRows = BLOCK_DIM / TILE_SIZE;
        // B
        for (int r = 0; r < TILE_SIZE; r += nbRows)
        {
            uint32_t row_offset = kId;
            uint32_t col_offset = TILE_SIZE * blockIdx.y;
            // Reads by columns for coalesced loads
            uint32_t row = row_offset + r + (tid / TILE_SIZE);
            uint32_t col = col_offset + (tid % TILE_SIZE);
            uint32_t bIndex = row * N + col;
            if (col<N){
                s_b[col % TILE_SIZE][row % TILE_SIZE] = b[bIndex]; // transposed
            }
            
        }
        // A
        for (int r = 0; r < TILE_SIZE; r += nbRows)
        {
            uint32_t row_offset = TILE_SIZE * blockIdx.x;
            uint32_t col_offset = kId;
            // Reads by rows for coalesced loads
            uint32_t row = row_offset + (tid % TILE_SIZE);
            uint32_t col = col_offset + r + (tid / TILE_SIZE);
            uint32_t aIndex = col * M + row;
            auto aT = row<M ? a[aIndex] : (fp8)0;
            if (row<M){
                s_a[row % TILE_SIZE][col % TILE_SIZE] = a[aIndex]; // transposed
            }
        }
        __syncthreads();
    
                    for (int t_wIdx = 0; t_wIdx < WARP_TILE_SIZE_X; t_wIdx++)
                    {
                        for (int t_wIdy = 0; t_wIdy < WARP_TILE_SIZE_Y; t_wIdy++)
                        {
                            constexpr int stepX = TILE_SIZE / WARP_TILE_SIZE_X; // 16
                            constexpr int stepY = TILE_SIZE / WARP_TILE_SIZE_Y; // 32
                            // One matmul needs 4 iterations
                constexpr int nbIter = TILE_SIZE / 32; // 32 being K dim of the mfma16x16x32fp8
                            vec4f c_tmp = {0.0f, 0.0f, 0.0f, 0.0f};
                for (int i = 0; i < nbIter; i++)
                {
                            int a_col = 32 * i;
                            int a_row = (t_wIdx * stepX) + warpIdx * 16; // 16 is M of the mfma16x16x32fp8
                            int b_row = 32 * i;
                            int b_col = (t_wIdy * stepY) + warpIdy * 16; // 16 is N of the mfma16x16x32fp8
                    matmul16x16(&s_a[a_row][a_col], &s_b[b_col][b_row], c_tmp, TILE_SIZE, TILE_SIZE);
                }
                            int a_row = (t_wIdx * stepX) + warpIdx * 16; // 16 is M of the mfma16x16x32fp8
                            // Apply scaling
                            int as_col = kId / 128;
                            int as_row = a_row + blockIdx.x * TILE_SIZE;
                            int bs_col = blockIdx.y;
                            int bs_row = kId / 128;
                            float bs_val = bs[bs_row * SN+ bs_col]; // row major same as Bt ?
                            for (int i = 0; i < 4; i++)
                            {
                                int row = as_row + i + (laneId / 16) * 4;
                                float as_val = as[as_col * M + row];
                                c_s[t_wIdx][t_wIdy][i] += c_tmp[i] * as_val * bs_val;
                        }
                    }
                }
        __syncthreads();
    }
    for (int t_wIdx = 0; t_wIdx < WARP_TILE_SIZE_X; t_wIdx++)
    {
        for (int t_wIdy = 0; t_wIdy < WARP_TILE_SIZE_Y; t_wIdy++)
        {
            // offset pointing to the accumulated 16x16 block
            int col_offset = blockIdx.y * TILE_SIZE +                 // TILE offset
                             (warpIdy * 16) +                         // Warp offset
                             t_wIdy * (TILE_SIZE / WARP_TILE_SIZE_Y); // Warp tile offset

            int row_offset = blockIdx.x * TILE_SIZE +                 // TILE offset
                             (warpIdx * 16) +                         // Warp offset
                             t_wIdx * (TILE_SIZE / WARP_TILE_SIZE_X); // Warp tile offset

            auto res = c_s[t_wIdx][t_wIdy];
            // C is stored on 4 VGPRs
            for (int i = 0; i < 4; i++)
            {
                int col = laneId % 16;
                int row = i + (laneId / 16) * 4;
                if ((row_offset + row)<M && (col_offset + col)<N)
                {
                    c[(row_offset + row) * N + (col_offset + col)] = (__hip_bfloat16)(res[i]);
                }
            }
        }
    }
}

void fp8_mm(torch::Tensor a, torch::Tensor b, torch::Tensor as, torch::Tensor bs, torch::Tensor c) {
    int m = a.size(0);
    int n = b.size(0);
    int k = a.size(1);
    custom_kernel<<<dim3((m+127)/128, (n+127)/128), dim3(4*2*64,1), 0, 0>>> ((__hip_fp8_e4m3_fnuz*)a.data_ptr(), (__hip_fp8_e4m3_fnuz*)b.data_ptr(), 
    as.data_ptr<float>(), bs.data_ptr<float>(), (__hip_bfloat16*)c.data_ptr(), m, n, k);
    //C10_CUDA_CHECK(cudaGetLastError());
}
"""

import os
os.environ["CXX"] = "clang++"

module = load_inline(
    name='fp8_mm',
    cpp_sources=[CPP_WRAPPER],
    cuda_sources=[CUDA_SRC],
    functions=['fp8_mm'],
    verbose=True,
    extra_cuda_cflags=["--offload-arch=gfx942", "-std=c++20"],
)


def custom_kernel(data: input_t) -> output_t:
    a, b, a_scale, b_scale, c = data
    module.fp8_mm(a, b, a_scale, b_scale, c)
    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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