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submission 30355

KernelBot user 415 · 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.

amd-fp8-mm-submission.py
curl "https://kernelindex.com/api/v1/implementations/kernelbot-amd-fp8-mm-30355?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
41.1µs
#30 of 98
2025-06-01
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 256]
AMD Instinct MI300X
43.7µs
#37 of 98
2025-06-01
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 1536]
AMD Instinct MI300X
55.2µs
#21 of 98
2025-06-01
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=512 · seed=6563
AMD Instinct MI300X
81.8µs
#28 of 98
2025-06-01
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 256]
AMD Instinct MI300X
87.9µs
#19 of 98
2025-06-01
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 512]
AMD Instinct MI300X
88.3µs
#17 of 98
2025-06-01
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=576 · seed=12346
AMD Instinct MI300X
88.5µs
#34 of 98
2025-06-01
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 2048]
AMD Instinct MI300X
120.1µs
#34 of 98
2025-06-01
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 2304]
AMD Instinct MI300X
132.0µs
#37 of 98
2025-06-01
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 1536]
AMD Instinct MI300X
132.8µs
#15 of 98
2025-06-01
Run →
Show all 18 measurements ›
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=1536 · seed=8135
AMD Instinct MI300X
136.5µs
#33 of 98
2025-06-01
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=512 · seed=12341
AMD Instinct MI300X
163.2µs
#24 of 98
2025-06-01
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=576 · seed=9863
AMD Instinct MI300X
168.2µs
#22 of 98
2025-06-01
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=4608 · seed=7531
AMD Instinct MI300X
197.8µs
#28 of 98
2025-06-01
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=1536 · seed=6543
AMD Instinct MI300X
264.0µs
#22 of 98
2025-06-01
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 2048]
AMD Instinct MI300X
331.9µs
#15 of 98
2025-06-01
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 2304]
AMD Instinct MI300X
367.0µs
#15 of 98
2025-06-01
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=4608 · seed=65436
AMD Instinct MI300X
652.9µs
#15 of 98
2025-06-01
Run →

Reported · How evidence levels are derived →

Source and license

sourceavailable
revision digestsha256:78f89793ec42277e6e7f14141d02bd40e1f0ad8bed767b08b80b419754176510
license declaredunknown
license concludedunknown
imported2026-08-15

Kernel source

amd-fp8-mm-submission.py1 lines
# This script provides a template for using load_inline to run a HIP kernel for
import os
os.environ['PYTORCH_ROCM_ARCH'] = 'gfx942'
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/hip_runtime.h>
#include <hip/amd_detail/amd_hip_fp8.h>
#include <hip/amd_detail/amd_hip_bf16.h>

constexpr const int BLOCK = 128;

#define SWZ_32ft2(m, n) (((m) * 8 + ((m) / 16) * 8 + (n)) % 128)
__global__ void fp8_mm_32x32_16x16_ft2(
            const __hip_fp8_e4m3_fnuz* __restrict__ a,
            const __hip_fp8_e4m3_fnuz* __restrict__ b,
            const float* __restrict__ as,
            const float* __restrict__ bs,
            __hip_bfloat16* __restrict__ c, int m, int n, int k) {

    using float4 = float __attribute__((ext_vector_type(4)));

    __shared__ __hip_fp8_e4m3_fnuz lds_a[32][128];
    __shared__ __hip_fp8_e4m3_fnuz lds_b[32][128];

    int thread_block_m = blockIdx.x * 32;
    int thread_block_n = blockIdx.y * 32;

    int wave_m = (threadIdx.y / 2) * 16;
    int wave_n = (threadIdx.y % 2) * 16;

    int thread_c_m = (threadIdx.x / 16) * 4;
    int thread_c_n =  threadIdx.x % 16;

    // LDGSTS A&B Parameters
    int sts_k  = threadIdx.y * 32 + (threadIdx.x / 8) * 4;
    int sts_mn = (threadIdx.x % 8) * 4;
    int ldg_m = thread_block_m + sts_mn;
    int ldg_n = thread_block_n + sts_mn;
    int ldg_k = sts_k;

    // LDS A&B Parameters
    int lds_m = wave_m + threadIdx.x % 16;
    int lds_n = wave_n + threadIdx.x % 16;
    int lds_k = (threadIdx.x / 16) * 8;

    // C&D Parameters
    int c_m = thread_block_m + wave_m + thread_c_m;
    int c_n = thread_block_n + wave_n + thread_c_n;

    int as_m = c_m;
    int bs_n = c_n / BLOCK;

    float4 tile_d[1][1] = {0};

    for (int ib = 0; ib < k/BLOCK; ib++) {
        __hip_fp8_e4m3_fnuz ldg_a  [1][4][4], ldg_b  [1][4][4];
        __hip_fp8_e4m3_fnuz ldg_a_t[1][4][4], ldg_b_t[1][4][4];
        for (int ii = 0; ii < 1; ii++) {
            for (int jj = 0; jj < 4; jj++) {
                *(float *)ldg_a[ii][jj] = *(float *)&a[(ldg_k + ii*32 + jj + ib*BLOCK) * m + ldg_m];
                *(float *)ldg_b[ii][jj] = *(float *)&b[(ldg_k + ii*32 + jj + ib*BLOCK) * n + ldg_n];
            }
        }

        float this_as[1][4];
        for (int ii = 0; ii < 1; ii++) {
            *(float4 *)this_as[ii] = *(float4 *)&as[ib*m + as_m + ii*16];
        }
        float this_bs = bs[ib * ((n+BLOCK-1)/BLOCK) + bs_n];

        for (int ii = 0; ii < 1; ii++) {
            for (int jj = 0; jj < 4; jj++) {
                for (int kk = 0; kk < 4; kk++) {
                    ldg_a_t[ii][jj][kk] = ldg_a[ii][kk][jj];
                    ldg_b_t[ii][jj][kk] = ldg_b[ii][kk][jj];
                }
            }
            for (int jj = 0; jj < 4; jj++) {
                *(float *)&lds_a[sts_mn + jj][SWZ_32ft2(sts_mn + jj, sts_k + ii*64)] = *(float *)&ldg_a_t[ii][jj];
                *(float *)&lds_b[sts_mn + jj][SWZ_32ft2(sts_mn + jj, sts_k + ii*64)] = *(float *)&ldg_b_t[ii][jj];
            }
        }

        __syncthreads();

        float4 block_tile_d[1][1] = {0};
        long tile_a[1][4], tile_b[1][4];
        for (int ii = 0; ii < 1; ii++) {
            for (int kk = 0; kk < 4; kk++) {
                tile_a[ii][kk] = *(long *)&lds_a[lds_m + ii*16][SWZ_32ft2(lds_m + ii*16, lds_k + kk*32)];
            }
        }
        for (int jj = 0; jj < 1; jj++) {
            for (int kk = 0; kk < 4; kk++) {
                tile_b[jj][kk] = *(long *)&lds_b[lds_n + jj*16][SWZ_32ft2(lds_n + jj*16, lds_k + kk*32)];
            }
        }
        for (int ii = 0; ii < 1; ii++) {
            for (int jj = 0; jj < 1; jj++) {
                for (int kk = 0; kk < 4; kk++) {
                    block_tile_d[ii][jj] = __builtin_amdgcn_mfma_f32_16x16x32_fp8_fp8(tile_a[ii][kk], tile_b[jj][kk], block_tile_d[ii][jj], 0, 0, 0);
                }
                for (int kk = 0; kk < 4; kk++) {
                    tile_d[ii][jj][kk] += block_tile_d[ii][jj][kk] * this_as[ii][kk] * this_bs;
                }
            }
        }

        __syncthreads();
    }

    // finally, write the result as bf16
    for (int ii = 0; ii < 1; ii++) {
        for (int jj = 0; jj < 1; jj++) {
            for (int kk = 0; kk < 4; kk++) {
                c[(c_m + ii*16 + kk) * n + c_n + jj*16] = (__hip_bfloat16)(tile_d[ii][jj][kk]);
            }
        }
    }
}


#define SWZ_64ft2(m, n) (((m) * 8 + ((m) / 16) * 8 + (n)) % 128)
__launch_bounds__(256, 4)
__global__ void fp8_mm_64x64_32x32_ft2(
        const __hip_fp8_e4m3_fnuz* __restrict__ a,
        const __hip_fp8_e4m3_fnuz* __restrict__ b,
        const float* __restrict__ as,
        const float* __restrict__ bs,
        __hip_bfloat16* __restrict__ c, int m, int n, int k) {

    using float4 = float __attribute__((ext_vector_type(4)));

    __shared__ __hip_fp8_e4m3_fnuz lds_a[64][128];
    __shared__ __hip_fp8_e4m3_fnuz lds_b[64][128];

    int thread_block_m = blockIdx.x * 64;
    int thread_block_n = blockIdx.y * 64;

    int wave_m = (threadIdx.y / 2) * 32;
    int wave_n = (threadIdx.y % 2) * 32;

    int thread_c_m = (threadIdx.x / 16) * 4;
    int thread_c_n =  threadIdx.x % 16;

    // LDGSTS A&B Parameters
    int sts_k  = threadIdx.y * 16 + (threadIdx.x / 16) * 4;
    int sts_mn = (threadIdx.x % 16) * 4;
    int ldg_m = thread_block_m + sts_mn;
    int ldg_n = thread_block_n + sts_mn;
    int ldg_k = sts_k;

    // LDS A&B Parameters
    int lds_m = wave_m + threadIdx.x % 16;
    int lds_n = wave_n + threadIdx.x % 16;
    int lds_k = (threadIdx.x / 16) * 8;

    // C&D Parameters
    int c_m = thread_block_m + wave_m + thread_c_m;
    int c_n = thread_block_n + wave_n + thread_c_n;

    int as_m = c_m;
    int bs_n = c_n / BLOCK;

    float4 tile_d[2][2] = {0};

    for (int ib = 0; ib < k/BLOCK; ib++) {
        __hip_fp8_e4m3_fnuz ldg_a  [2][4][4], ldg_b  [2][4][4];
        __hip_fp8_e4m3_fnuz ldg_a_t[2][4][4], ldg_b_t[2][4][4];
        for (int ii = 0; ii < 2; ii++) {
            for (int jj = 0; jj < 4; jj++) {
                *(float *)ldg_a[ii][jj] = ldg_m < m ? *(float *)&a[(ldg_k + ii*64 + jj + ib*BLOCK) * m + ldg_m] : 0;
                *(float *)ldg_b[ii][jj] = ldg_n < n ? *(float *)&b[(ldg_k + ii*64 + jj + ib*BLOCK) * n + ldg_n] : 0;
            }
        }

        float this_as[2][4];
        for (int ii = 0; ii < 2; ii++) {
            *(float4 *)this_as[ii] = as_m + ii*16 < m ? *(float4 *)&as[ib*m + as_m + ii*16] : 0;
        }
        float this_bs = bs[ib * ((n+BLOCK-1)/BLOCK) + bs_n];

        for (int ii = 0; ii < 2; ii++) {
            for (int jj = 0; jj < 4; jj++) {
                for (int kk = 0; kk < 4; kk++) {
                    ldg_a_t[ii][jj][kk] = ldg_a[ii][kk][jj];
                    ldg_b_t[ii][jj][kk] = ldg_b[ii][kk][jj];
                }
            }
            for (int jj = 0; jj < 4; jj++) {
                *(float *)&lds_a[sts_mn + jj][SWZ_64ft2(sts_mn + jj, sts_k + ii*64)] = *(float *)&ldg_a_t[ii][jj];
                *(float *)&lds_b[sts_mn + jj][SWZ_64ft2(sts_mn + jj, sts_k + ii*64)] = *(float *)&ldg_b_t[ii][jj];
            }
        }

        __syncthreads();

        float4 block_tile_d[2][2] = {0};
        long tile_a[2][4], tile_b[2][4];
        for (int ii = 0; ii < 2; ii++) {
            for (int kk = 0; kk < 4; kk++) {
                tile_a[ii][kk] = *(long *)&lds_a[lds_m + ii*16][SWZ_64ft2(lds_m + ii*16, lds_k + kk*32)];
            }
        }
        for (int jj = 0; jj < 2; jj++) {
            for (int kk = 0; kk < 4; kk++) {
                tile_b[jj][kk] = *(long *)&lds_b[lds_n + jj*16][SWZ_64ft2(lds_n + jj*16, lds_k + kk*32)];
            }
        }
        for (int ii = 0; ii < 2; ii++) {
            for (int jj = 0; jj < 2; jj++) {
                for (int kk = 0; kk < 4; kk++) {
                    block_tile_d[ii][jj] = __builtin_amdgcn_mfma_f32_16x16x32_fp8_fp8(tile_a[ii][kk], tile_b[jj][kk], block_tile_d[ii][jj], 0, 0, 0);
                }
                for (int kk = 0; kk < 4; kk++) {
                    tile_d[ii][jj][kk] += block_tile_d[ii][jj][kk] * this_as[ii][kk] * this_bs;
                }
            }
        }

        __syncthreads();
    }

    // finally, write the result as bf16
    for (int ii = 0; ii < 2; ii++) {
        for (int jj = 0; jj < 2; jj++) {
            for (int kk = 0; kk < 4; kk++) {
                if (c_m + ii*16 < m && c_n + jj*16 < n) {
                    c[(c_m + ii*16 + kk) * n + c_n + jj*16] = (__hip_bfloat16)(tile_d[ii][jj][kk]);
                }
            }
        }
    }
}

__global__ void insitu_transpose_128x128(const __hip_fp8_e4m3_fnuz* __restrict__ a, int m, int n) {
    // transpose in every 128x128 block

    using float4 = float __attribute__((ext_vector_type(4)));

    int thread_block_m = blockIdx.x * 128;
    int thread_block_n = blockIdx.y * 128;

    int thread_m = threadIdx.x / 8;
    int thread_n = (threadIdx.x % 8) * 16;

    __shared__ __hip_fp8_e4m3_fnuz smem[128][129];

    __hip_fp8_e4m3_fnuz data[16];

    *(float4 *)&data[0] = *(float4 *)&a[(thread_block_m + thread_m) * n + thread_block_n + thread_n];

    for (int i = 0; i < 16; i++) {
        smem[thread_n + i][thread_m] = data[i];
        // smem[thread_n + i][((thread_n / 16) * 16 + thread_m) % 128] = data[i]; // swizzle
    }

    __syncthreads();

    *(float4 *)&a[(thread_block_m + thread_m) * n + thread_block_n + thread_n] = *(float4 *)&smem[thread_m][thread_n];
    // *(float4 *)&a[(thread_block_m + thread_m) * n + thread_block_n + thread_n] = *(float4 *)&smem[thread_m][((thread_m / 16) * 16 + thread_n) % 128]; // swizzle
}

#define SWZ_128pt(m, n) (((m) * 8 + (n)) % 128)
__launch_bounds__(512, 2)
__global__ void fp8_mm_128x128_pt(
        const __hip_fp8_e4m3_fnuz* __restrict__ a,
        const __hip_fp8_e4m3_fnuz* __restrict__ b,
        const float* __restrict__ as,
        const float* __restrict__ bs,
        __hip_bfloat16* __restrict__ c, int m, int n, int k) {

    using float4 = float __attribute__((ext_vector_type(4)));

    __shared__ __hip_fp8_e4m3_fnuz lds_a[128][128];
    __shared__ __hip_fp8_e4m3_fnuz lds_b[128][128];

    int thread_block_m = blockIdx.x * 128;
    int thread_block_n = blockIdx.y * 128;

    int wave_m = (threadIdx.y / 2) * 32;
    int wave_n = (threadIdx.y % 2) * 64;

    int thread_c_m = (threadIdx.x / 16) * 4;
    int thread_c_n =  threadIdx.x % 16;

    // LDGSTS A&B Parameters
    int sts_mn = threadIdx.y * 8 + threadIdx.x / 8;
    int sts_k  = (threadIdx.x % 8) * 16;
    int ldg_m = thread_block_m + sts_k;
    int ldg_n = thread_block_n + sts_k;
    int ldg_k = sts_mn;

    // LDS A&B Parameters
    int lds_m = wave_m + threadIdx.x % 16;
    int lds_n = wave_n + threadIdx.x % 16;
    int lds_k = (threadIdx.x / 16) * 8;

    // C&D Parameters
    int c_m = thread_block_m + wave_m + thread_c_m;
    int c_n = thread_block_n + wave_n + thread_c_n;

    int as_m = c_m;
    int bs_n = c_n / BLOCK;

    float4 tile_d[2][4] = {0};

    for (int ib = 0; ib < k/BLOCK; ib++) {
        __hip_fp8_e4m3_fnuz ldg_a[2][16], ldg_b[2][16];
        for (int ii = 0; ii < 2; ii++) {
            *(float4 *)ldg_a[ii] = *(float4 *)&a[(ldg_k + ib*BLOCK + ii*64) * m + ldg_m];
            *(float4 *)ldg_b[ii] = *(float4 *)&b[(ldg_k + ib*BLOCK + ii*64) * n + ldg_n];
        }

        float this_as[2][4];
        for (int ii = 0; ii < 2; ii++) {
            *(float4 *)this_as[ii] = *(float4 *)&as[ib*m + as_m + ii*16];
        }
        float this_bs = bs[ib * ((n+BLOCK-1)/BLOCK) + bs_n];

        for (int ii = 0; ii < 2; ii++) {
            *(long *)&lds_a[sts_mn + ii*64][SWZ_128pt(sts_mn, sts_k    )] = *(long *)&ldg_a[ii][0];
            *(long *)&lds_a[sts_mn + ii*64][SWZ_128pt(sts_mn, sts_k + 8)] = *(long *)&ldg_a[ii][8];
            *(long *)&lds_b[sts_mn + ii*64][SWZ_128pt(sts_mn, sts_k    )] = *(long *)&ldg_b[ii][0];
            *(long *)&lds_b[sts_mn + ii*64][SWZ_128pt(sts_mn, sts_k + 8)] = *(long *)&ldg_b[ii][8];
        }

        __syncthreads();

        float4 block_tile_d[2][4] = {0};
        long tile_a[2][4], tile_b[4][4];
        for (int ii = 0; ii < 2; ii++) {
            for (int kk = 0; kk < 4; kk++) {
                tile_a[ii][kk] = *(long *)&lds_a[lds_m + ii*16][SWZ_128pt(lds_m, lds_k + kk*32)];
            }
        }
        for (int jj = 0; jj < 4; jj++) {
            for (int kk = 0; kk < 4; kk++) {
                tile_b[jj][kk] = *(long *)&lds_b[lds_n + jj*16][SWZ_128pt(lds_n, lds_k + kk*32)];
            }
        }
        for (int ii = 0; ii < 2; ii++) {
            for (int jj = 0; jj < 4; jj++) {
                for (int kk = 0; kk < 4; kk++) {
                    block_tile_d[ii][jj] = __builtin_amdgcn_mfma_f32_16x16x32_fp8_fp8(tile_a[ii][kk], tile_b[jj][kk], block_tile_d[ii][jj], 0, 0, 0);
                }
                for (int kk = 0; kk < 4; kk++) {
                    tile_d[ii][jj][kk] += block_tile_d[ii][jj][kk] * this_as[ii][kk] * this_bs;
                }
            }
        }

        __syncthreads();
    }

    // finally, write the result as bf16
    for (int ii = 0; ii < 2; ii++) {
        for (int jj = 0; jj < 4; jj++) {
            for (int kk = 0; kk < 4; kk++) {
                c[(c_m + ii*16 + kk) * n + c_n + jj*16] = (__hip_bfloat16)(tile_d[ii][jj][kk]);
            }
        }
    }
}

#define SWZ_128ft2(m, n) (((m) * 8 + ((m) / 16) * 8 + (n)) % 128)
__launch_bounds__(512, 2)
__global__ void fp8_mm_128x128_ft2(
        const __hip_fp8_e4m3_fnuz* __restrict__ a,
        const __hip_fp8_e4m3_fnuz* __restrict__ b,
        const float* __restrict__ as,
        const float* __restrict__ bs,
        __hip_bfloat16* __restrict__ c, int m, int n, int k) {

    using float4 = float __attribute__((ext_vector_type(4)));

    __shared__ __hip_fp8_e4m3_fnuz lds_a[128][128];
    __shared__ __hip_fp8_e4m3_fnuz lds_b[128][128];

    int thread_block_m = blockIdx.x * 128;
    int thread_block_n = blockIdx.y * 128;

    int wave_m = (threadIdx.y / 2) * 32;
    int wave_n = (threadIdx.y % 2) * 64;

    int thread_c_m = (threadIdx.x / 16) * 4;
    int thread_c_n =  threadIdx.x % 16;

    // LDGSTS A&B Parameters
    int sts_k  = threadIdx.y * 8 + (threadIdx.x / 32) * 4;
    int sts_mn = (threadIdx.x % 32) * 4;
    int ldg_m = thread_block_m + sts_mn;
    int ldg_n = thread_block_n + sts_mn;
    int ldg_k = sts_k;

    // LDS A&B Parameters
    int lds_m = wave_m + threadIdx.x % 16;
    int lds_n = wave_n + threadIdx.x % 16;
    int lds_k = (threadIdx.x / 16) * 8;

    // C&D Parameters
    int c_m = thread_block_m + wave_m + thread_c_m;
    int c_n = thread_block_n + wave_n + thread_c_n;

    int as_m = c_m;
    int bs_n = c_n / BLOCK;

    float4 tile_d[2][4] = {0};

    for (int ib = 0; ib < k/BLOCK; ib++) {
        __hip_fp8_e4m3_fnuz ldg_a  [2][4][4], ldg_b  [2][4][4];
        __hip_fp8_e4m3_fnuz ldg_a_t[2][4][4], ldg_b_t[2][4][4];
        for (int ii = 0; ii < 2; ii++) {
            for (int jj = 0; jj < 4; jj++) {
                *(float *)ldg_a[ii][jj] = ldg_m < m ? *(float *)&a[(ldg_k + ii*64 + jj + ib*BLOCK) * m + ldg_m] : 0;
                *(float *)ldg_b[ii][jj] = ldg_n < n ? *(float *)&b[(ldg_k + ii*64 + jj + ib*BLOCK) * n + ldg_n] : 0;
            }
        }

        float this_as[2][4];
        for (int ii = 0; ii < 2; ii++) {
            *(float4 *)this_as[ii] = as_m + ii*16 < m ? *(float4 *)&as[ib*m + as_m + ii*16] : 0;
        }
        float this_bs = bs[ib * ((n+BLOCK-1)/BLOCK) + bs_n];

        for (int ii = 0; ii < 2; ii++) {
            for (int jj = 0; jj < 4; jj++) {
                for (int kk = 0; kk < 4; kk++) {
                    ldg_a_t[ii][jj][kk] = ldg_a[ii][kk][jj];
                    ldg_b_t[ii][jj][kk] = ldg_b[ii][kk][jj];
                }
            }
            for (int jj = 0; jj < 4; jj++) {
                *(float *)&lds_a[sts_mn + jj][SWZ_128ft2(sts_mn + jj, sts_k + ii*64)] = *(float *)&ldg_a_t[ii][jj];
                *(float *)&lds_b[sts_mn + jj][SWZ_128ft2(sts_mn + jj, sts_k + ii*64)] = *(float *)&ldg_b_t[ii][jj];
            }
        }

        __syncthreads();

        float4 block_tile_d[2][4] = {0};
        long tile_a[2][4], tile_b[4][4];
        for (int ii = 0; ii < 2; ii++) {
            for (int kk = 0; kk < 4; kk++) {
                tile_a[ii][kk] = *(long *)&lds_a[lds_m + ii*16][SWZ_128ft2(lds_m + ii*16, lds_k + kk*32)];
            }
        }
        for (int jj = 0; jj < 4; jj++) {
            for (int kk = 0; kk < 4; kk++) {
                tile_b[jj][kk] = *(long *)&lds_b[lds_n + jj*16][SWZ_128ft2(lds_n + jj*16, lds_k + kk*32)];
            }
        }
        for (int ii = 0; ii < 2; ii++) {
            for (int jj = 0; jj < 4; jj++) {
                for (int kk = 0; kk < 4; kk++) {
                    block_tile_d[ii][jj] = __builtin_amdgcn_mfma_f32_16x16x32_fp8_fp8(tile_a[ii][kk], tile_b[jj][kk], block_tile_d[ii][jj], 0, 0, 0);
                }
                for (int kk = 0; kk < 4; kk++) {
                    tile_d[ii][jj][kk] += block_tile_d[ii][jj][kk] * this_as[ii][kk] * this_bs;
                }
            }
        }

        __syncthreads();
    }

    // finally, write the result as bf16
    for (int ii = 0; ii < 2; ii++) {
        for (int jj = 0; jj < 4; jj++) {
            for (int kk = 0; kk < 4; kk++) {
                if (c_m + ii*16 < m && c_n + jj*16 < n) {
                    c[(c_m + ii*16 + kk) * n + c_n + jj*16] = (__hip_bfloat16)(tile_d[ii][jj][kk]);
                }
            }
        }
    }
}

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);
    if (m * n < 64 * 128 * 128) { // group 32x32 wave 16x16 tiling
        fp8_mm_32x32_16x16_ft2<<<dim3((m+31)/32, (n+31)/32), dim3(64, 4), 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);
    }
    else if (m * n < 128 * 128 * 128) { // group 64x64 wave 32x32 tiling
        fp8_mm_64x64_32x32_ft2<<<dim3((m+63)/64, (n+63)/64), dim3(64, 4), 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);
    }
    else { // group 128x128 wave 32x64 tiling
        if (m * n >= 1024 * (m + n) && m % 128 == 0 && n % 128 == 0) {
            insitu_transpose_128x128<<<dim3((k+127)/128, (m+127)/128), dim3(1024), 0, 0>>>((__hip_fp8_e4m3_fnuz*)a.data_ptr(), k, m);
            insitu_transpose_128x128<<<dim3((k+127)/128, (n+127)/128), dim3(1024), 0, 0>>>((__hip_fp8_e4m3_fnuz*)b.data_ptr(), k, n);
            fp8_mm_128x128_pt<<<dim3((m+127)/128, (n+127)/128), dim3(64, 8), 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);
            // insitu_transpose_128x128<<<dim3((k+127)/128, (m+127)/128), dim3(1024), 0, 0>>>((__hip_fp8_e4m3_fnuz*)a.data_ptr(), k, m);
            // insitu_transpose_128x128<<<dim3((k+127)/128, (n+127)/128), dim3(1024), 0, 0>>>((__hip_fp8_e4m3_fnuz*)b.data_ptr(), k, n);
        }
        else {
            fp8_mm_128x128_ft2<<<dim3((m+127)/128, (n+127)/128), dim3(64, 8), 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", "-O3"],
)

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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