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submission 5109

KernelBot user 160 · 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.

bt_tt_wt_vec_smem_mfma.py
curl "https://kernelindex.com/api/v1/implementations/kernelbot-amd-fp8-mm-5109?include=source"
interfacepython
Compatibility
measured onAMD Instinct MI300X
declared hardwareAMD Instinct MI300X
architecturesgfx942
dtypesfp32, fp8_e4m3fnuz

Benchmark evidence

18 measurements across 1 GPU, fastest first.

Operation / workload
Hardware
Latency
Rank
Observed
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 256]
AMD Instinct MI300X
67.0µs
#79 of 98
2025-04-19
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 512]
AMD Instinct MI300X
79.9µs
#84 of 98
2025-04-19
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 1536]
AMD Instinct MI300X
168.6µs
#86 of 98
2025-04-19
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 256]
AMD Instinct MI300X
251.9µs
#86 of 98
2025-04-19
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 512]
AMD Instinct MI300X
288.8µs
#85 of 98
2025-04-19
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 2048]
AMD Instinct MI300X
354.4µs
#84 of 98
2025-04-19
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 2304]
AMD Instinct MI300X
398.4µs
#86 of 98
2025-04-19
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 1536]
AMD Instinct MI300X
598.6µs
#86 of 98
2025-04-19
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=512 · seed=6563
AMD Instinct MI300X
649.9µs
#96 of 98
2025-04-19
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=1536 · seed=8135
AMD Instinct MI300X
656.6µs
#91 of 98
2025-04-19
Run →
Show all 18 measurements ›
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=576 · seed=12346
AMD Instinct MI300X
679.2µs
#96 of 98
2025-04-19
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=512 · seed=12341
AMD Instinct MI300X
768.7µs
#84 of 98
2025-04-19
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=576 · seed=9863
AMD Instinct MI300X
788.5µs
#84 of 98
2025-04-19
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=4608 · seed=7531
AMD Instinct MI300X
911.4µs
#85 of 98
2025-04-19
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=1536 · seed=6543
AMD Instinct MI300X
1.61ms
#84 of 98
2025-04-19
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 2048]
AMD Instinct MI300X
1.77ms
#85 of 98
2025-04-19
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 2304]
AMD Instinct MI300X
2.01ms
#86 of 98
2025-04-19
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=4608 · seed=65436
AMD Instinct MI300X
4.25ms
#86 of 98
2025-04-19
Run →

Reported · How evidence levels are derived →

Source and license

sourceavailable
revision digestsha256:e204ada0f19868d0f1c6e040f45a183442a96d1097b4aa708ff5c953859dbcbe
license declaredunknown
license concludedunknown
imported2026-08-15

Kernel source

bt_tt_wt_vec_smem_mfma.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++"

cuda_src = r"""
#include <iostream>
#include <hip/hip_runtime.h>
#include <hip/amd_detail/amd_hip_bf16.h>
#include <hip/amd_detail/amd_hip_fp8.h>

__host__ __device__ __forceinline__ size_t cdiv(size_t a, size_t b) {
  return (a + b - 1) / b;
}

#define BLOCK_DIM 128

template <const size_t BN, const size_t BK, const size_t BM>
__global__ void fp8_mm_kernel(const __hip_fp8_e4m3_fnuz *A,
                              const __hip_fp8_e4m3_fnuz *B,
                              const float *A_scale, const float *B_scale,
                              __hip_bfloat16 *C, size_t N, size_t K, size_t M) {
  using floatx16 = __attribute__((__vector_size__(16 * sizeof(float)))) float;

  static constexpr size_t VECTOR_SIZE = 4;
  static constexpr size_t WARPSIZE = 64;
  static constexpr size_t numThreads = (BN * BM) / 16;
  static constexpr size_t strideA = (numThreads / (BN / VECTOR_SIZE));
  static constexpr size_t strideB = (numThreads / (BM / VECTOR_SIZE));

  size_t rowOffsetC = blockIdx.y * BN;
  size_t colOffsetC = blockIdx.x * BM;
  size_t colOffsetA = rowOffsetC;
  size_t colOffsetB = colOffsetC;

  static_assert(numThreads % BN == 0, "BN should be a multiple of numThreads");
  static_assert(numThreads % BN == 0, "BM should be a multiple of numThreads");
  static_assert(BN <= 128 && BK <= 128 && BM <= 128,
                "Range above 128 is not supported");

  size_t innerColA = threadIdx.x % (BN / VECTOR_SIZE);
  size_t innerRowA = threadIdx.x / (BN / VECTOR_SIZE);
  size_t innerColB = threadIdx.x % (BM / VECTOR_SIZE);
  size_t innerRowB = threadIdx.x / (BM / VECTOR_SIZE);

  size_t laneIdx = threadIdx.x % WARPSIZE;
  size_t warpIdx = threadIdx.x / WARPSIZE;
  size_t warpColOffset = (warpIdx % (BM / 32)) * 32;
  size_t warpRowOffset = (warpIdx / (BM / 32)) * 32;
  size_t warpX = laneIdx % 32;
  size_t warpY = laneIdx / 32;

  __shared__ __hip_fp8_e4m3_fnuz As[BK][BN], Bs[BK][BM];
  __shared__ float Ws[BN + 1];

  __hip_fp8_e4m3_fnuz a[8], b[8];
  floatx16 d = {0};

  for (size_t tileOffset = 0; tileOffset < K; tileOffset += BK) {
    // load from global to shared memory in coalesced manner
    for (size_t innerRowOffsetA = 0; innerRowOffsetA < BK;
         innerRowOffsetA += strideA) {
      if ((tileOffset + innerRowOffsetA + innerRowA) < K &&
          (colOffsetA + innerColA * VECTOR_SIZE) < N &&
          (innerRowOffsetA + innerRowA) < BK &&
          (innerColA * VECTOR_SIZE) < BN) {
        __hip_fp8x4_e4m3_fnuz tmp =
            *(__hip_fp8x4_e4m3_fnuz
                  *)&A[(tileOffset + innerRowOffsetA + innerRowA) * N +
                       (colOffsetA + innerColA * VECTOR_SIZE)];
        *(__hip_fp8x4_e4m3_fnuz *)&As[innerRowOffsetA + innerRowA]
                                     [innerColA * VECTOR_SIZE] = tmp;
        if (threadIdx.x < (BN / VECTOR_SIZE)) {
          float4 tmp =
              *(float4 *)&A_scale[((tileOffset + innerRowOffsetA + innerRowA) /
                                   BLOCK_DIM) *
                                      N +
                                  (colOffsetA + innerColA * VECTOR_SIZE)];
          *(float4 *)&Ws[threadIdx.x * VECTOR_SIZE] = tmp;
        }
      } else if ((innerRowOffsetA + innerRowA) < BK &&
                 (innerColA * VECTOR_SIZE) < BN) {
        *(__hip_fp8x4_e4m3_fnuz *)&As[innerRowOffsetA + innerRowA]
                                     [innerColA * VECTOR_SIZE] =
            float4{0.0f, 0.0f, 0.0f, 0.0f};
      }
    }
    for (size_t innerRowOffsetB = 0; innerRowOffsetB < BK;
         innerRowOffsetB += strideB) {
      if ((tileOffset + innerRowOffsetB + innerRowB) < K &&
          (colOffsetB + innerColB) < M && (innerRowOffsetB + innerRowB) < BK &&
          (innerColB * VECTOR_SIZE) < BM) {
        __hip_fp8x4_e4m3_fnuz tmp =
            *(__hip_fp8x4_e4m3_fnuz
                  *)&B[(tileOffset + innerRowOffsetB + innerRowB) * M +
                       (colOffsetB + innerColB * VECTOR_SIZE)];
        *(__hip_fp8x4_e4m3_fnuz *)&Bs[innerRowOffsetB + innerRowB]
                                     [innerColB * VECTOR_SIZE] = tmp;
        if (threadIdx.x == BN) {
          Ws[BN] =
              B_scale[((tileOffset + innerRowOffsetB + innerRowB) / BLOCK_DIM) *
                          cdiv(M, BLOCK_DIM) +
                      ((colOffsetB + innerColB) / BLOCK_DIM)];
        }
      } else if ((innerRowOffsetB + innerRowB) < BK &&
                 (innerColB * VECTOR_SIZE) < BM) {
        *(__hip_fp8x4_e4m3_fnuz *)&Bs[innerRowOffsetB + innerRowB]
                                     [innerColB * VECTOR_SIZE] =
            float4{0.0f, 0.0f, 0.0f, 0.0f};
      }
    }

    __syncthreads();

    for (size_t BKOffset = 0; BKOffset < BK; BKOffset += 16) {
      for (size_t i = 0; i < 8; ++i) {
        a[i] = As[BKOffset + warpY * 8 + i][warpRowOffset + warpX];
        b[i] = Bs[BKOffset + warpY * 8 + i][warpColOffset + warpX];
      }
      floatx16 c = {0};
      c = __builtin_amdgcn_mfma_f32_32x32x16_fp8_fp8(
          *reinterpret_cast<long *>(a), *reinterpret_cast<long *>(b), c, 0, 0,
          0);
      float b_scale = Ws[BN];
#pragma unroll 2
      for (size_t j = 0; j < 4; ++j) {
        for (size_t i = 0; i < 4; ++i) {
          d[i + j * 4] += c[i + j * 4] *
                          Ws[warpRowOffset + j * 8 + warpY * 4 + i] * b_scale;
        }
      }
    }

    __syncthreads();
  }

#pragma unroll 2
  for (size_t j = 0; j < 4; ++j) {
    for (size_t i = 0; i < 4; ++i) {
      if ((rowOffsetC + warpRowOffset + j * 8 + warpY * 4 + i) < N &&
          (colOffsetC + warpColOffset + warpX) < M)
        C[(rowOffsetC + warpRowOffset + j * 8 + warpY * 4 + i) * M +
          (colOffsetC + warpColOffset + warpX)] = (__hip_bfloat16)d[i + j * 4];
    }
  }
}

at::Tensor fp8_mm(at::Tensor A, at::Tensor B, at::Tensor A_scale,
                  at::Tensor B_scale, at::Tensor C) {
  size_t N = A.size(0), K = A.size(1), M = B.size(0);

  const size_t BK = 16;
  const size_t BN = 64;
  const size_t BM = 64;
  dim3 numThreads((BN * BM) / 16);
  dim3 numBlocks(cdiv(M, BM), cdiv(N, BN));
  fp8_mm_kernel<BN, BK, BM><<<numBlocks, numThreads>>>(
      (__hip_fp8_e4m3_fnuz *)A.data_ptr(), (__hip_fp8_e4m3_fnuz *)B.data_ptr(),
      A_scale.data_ptr<float>(), B_scale.data_ptr<float>(),
      (__hip_bfloat16 *)C.data_ptr(), N, K, M);
  return C;
}
"""

cpp_src = r"""
at::Tensor fp8_mm(at::Tensor A, at::Tensor B, at::Tensor A_scale,
                  at::Tensor B_scale, at::Tensor C);
"""

module = load_inline(
    name="fp8_mm",
    cpp_sources=[cpp_src],
    cuda_sources=[cuda_src],
    functions=["fp8_mm"],
    verbose=True,
    extra_cuda_cflags=["-O3", "--offload-arch=gfx942", "-std=c++20"],
)


def custom_kernel(data: input_t) -> output_t:
    a, b, a_scale, b_scale, c = data
    return module.fp8_mm(a, b, a_scale, b_scale, 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 3803.

- 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
   No newline at end of file
+ #!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++"

cuda_src = r"""
#include <iostream>
#include <hip/hip_runtime.h>
#include <hip/amd_detail/amd_hip_bf16.h>
#include <hip/amd_detail/amd_hip_fp8.h>

__host__ __device__ __forceinline__ size_t cdiv(size_t a, size_t b) {
  return (a + b - 1) / b;
}

#define BLOCK_DIM 128

template <const size_t BN, const size_t BK, const size_t BM>
__global__ void fp8_mm_kernel(const __hip_fp8_e4m3_fnuz *A,
                              const __hip_fp8_e4m3_fnuz *B,
                              const float *A_scale, const float *B_scale,
                              __hip_bfloat16 *C, size_t N, size_t K, size_t M) {
  using floatx16 = __attribute__((__vector_size__(16 * sizeof(float)))) float;

  static constexpr size_t VECTOR_SIZE = 4;
  static constexpr size_t WARPSIZE = 64;
  static constexpr size_t numThreads = (BN * BM) / 16;
  static constexpr size_t strideA = (numThreads / (BN / VECTOR_SIZE));
  static constexpr size_t strideB = (numThreads / (BM / VECTOR_SIZE));

  size_t rowOffsetC = blockIdx.y * BN;
  size_t colOffsetC = blockIdx.x * BM;
  size_t colOffsetA = rowOffsetC;
  size_t colOffsetB = colOffsetC;

  static_assert(numThreads % BN == 0, "BN should be a multiple of numThreads");
  static_assert(numThreads % BN == 0, "BM should be a multiple of numThreads");
  static_assert(BN <= 128 && BK <= 128 && BM <= 128,
                "Range above 128 is not supported");

  size_t innerColA = threadIdx.x % (BN / VECTOR_SIZE);
  size_t innerRowA = threadIdx.x / (BN / VECTOR_SIZE);
  size_t innerColB = threadIdx.x % (BM / VECTOR_SIZE);
  size_t innerRowB = threadIdx.x / (BM / VECTOR_SIZE);

  size_t laneIdx = threadIdx.x % WARPSIZE;
  size_t warpIdx = threadIdx.x / WARPSIZE;
  size_t warpColOffset = (warpIdx % (BM / 32)) * 32;
  size_t warpRowOffset = (warpIdx / (BM / 32)) * 32;
  size_t warpX = laneIdx % 32;
  size_t warpY = laneIdx / 32;

  __shared__ __hip_fp8_e4m3_fnuz As[BK][BN], Bs[BK][BM];
  __shared__ float Ws[BN + 1];

  __hip_fp8_e4m3_fnuz a[8], b[8];
  floatx16 d = {0};

  for (size_t tileOffset = 0; tileOffset < K; tileOffset += BK) {
    // load from global to shared memory in coalesced manner
    for (size_t innerRowOffsetA = 0; innerRowOffsetA < BK;
         innerRowOffsetA += strideA) {
      if ((tileOffset + innerRowOffsetA + innerRowA) < K &&
          (colOffsetA + innerColA * VECTOR_SIZE) < N &&
          (innerRowOffsetA + innerRowA) < BK &&
          (innerColA * VECTOR_SIZE) < BN) {
        __hip_fp8x4_e4m3_fnuz tmp =
            *(__hip_fp8x4_e4m3_fnuz
                  *)&A[(tileOffset + innerRowOffsetA + innerRowA) * N +
                       (colOffsetA + innerColA * VECTOR_SIZE)];
        *(__hip_fp8x4_e4m3_fnuz *)&As[innerRowOffsetA + innerRowA]
                                     [innerColA * VECTOR_SIZE] = tmp;
        if (threadIdx.x < (BN / VECTOR_SIZE)) {
          float4 tmp =
              *(float4 *)&A_scale[((tileOffset + innerRowOffsetA + innerRowA) /
                                   BLOCK_DIM) *
                                      N +
                                  (colOffsetA + innerColA * VECTOR_SIZE)];
          *(float4 *)&Ws[threadIdx.x * VECTOR_SIZE] = tmp;
        }
      } else if ((innerRowOffsetA + innerRowA) < BK &&
                 (innerColA * VECTOR_SIZE) < BN) {
        *(__hip_fp8x4_e4m3_fnuz *)&As[innerRowOffsetA + innerRowA]
                                     [innerColA * VECTOR_SIZE] =
            float4{0.0f, 0.0f, 0.0f, 0.0f};
      }
    }
    for (size_t innerRowOffsetB = 0; innerRowOffsetB < BK;
         innerRowOffsetB += strideB) {
      if ((tileOffset + innerRowOffsetB + innerRowB) < K &&
          (colOffsetB + innerColB) < M && (innerRowOffsetB + innerRowB) < BK &&
          (innerColB * VECTOR_SIZE) < BM) {
        __hip_fp8x4_e4m3_fnuz tmp =
            *(__hip_fp8x4_e4m3_fnuz
                  *)&B[(tileOffset + innerRowOffsetB + innerRowB) * M +
                       (colOffsetB + innerColB * VECTOR_SIZE)];
        *(__hip_fp8x4_e4m3_fnuz *)&Bs[innerRowOffsetB + innerRowB]
                                     [innerColB * VECTOR_SIZE] = tmp;
        if (threadIdx.x == BN) {
          Ws[BN] =
              B_scale[((tileOffset + innerRowOffsetB + innerRowB) / BLOCK_DIM) *
                          cdiv(M, BLOCK_DIM) +
                      ((colOffsetB + innerColB) / BLOCK_DIM)];
        }
      } else if ((innerRowOffsetB + innerRowB) < BK &&
                 (innerColB * VECTOR_SIZE) < BM) {
        *(__hip_fp8x4_e4m3_fnuz *)&Bs[innerRowOffsetB + innerRowB]
                                     [innerColB * VECTOR_SIZE] =
            float4{0.0f, 0.0f, 0.0f, 0.0f};
      }
    }

    __syncthreads();

    for (size_t BKOffset = 0; BKOffset < BK; BKOffset += 16) {
      for (size_t i = 0; i < 8; ++i) {
        a[i] = As[BKOffset + warpY * 8 + i][warpRowOffset + warpX];
        b[i] = Bs[BKOffset + warpY * 8 + i][warpColOffset + warpX];
      }
      floatx16 c = {0};
      c = __builtin_amdgcn_mfma_f32_32x32x16_fp8_fp8(
          *reinterpret_cast<long *>(a), *reinterpret_cast<long *>(b), c, 0, 0,
          0);
      float b_scale = Ws[BN];
#pragma unroll 2
      for (size_t j = 0; j < 4; ++j) {
        for (size_t i = 0; i < 4; ++i) {
          d[i + j * 4] += c[i + j * 4] *
                          Ws[warpRowOffset + j * 8 + warpY * 4 + i] * b_scale;
        }
      }
    }

    __syncthreads();
  }

#pragma unroll 2
  for (size_t j = 0; j < 4; ++j) {
    for (size_t i = 0; i < 4; ++i) {
      if ((rowOffsetC + warpRowOffset + j * 8 + warpY * 4 + i) < N &&
          (colOffsetC + warpColOffset + warpX) < M)
        C[(rowOffsetC + warpRowOffset + j * 8 + warpY * 4 + i) * M +
          (colOffsetC + warpColOffset + warpX)] = (__hip_bfloat16)d[i + j * 4];
    }
  }
}

at::Tensor fp8_mm(at::Tensor A, at::Tensor B, at::Tensor A_scale,
                  at::Tensor B_scale, at::Tensor C) {
  size_t N = A.size(0), K = A.size(1), M = B.size(0);

  const size_t BK = 16;
  const size_t BN = 64;
  const size_t BM = 64;
  dim3 numThreads((BN * BM) / 16);
  dim3 numBlocks(cdiv(M, BM), cdiv(N, BN));
  fp8_mm_kernel<BN, BK, BM><<<numBlocks, numThreads>>>(
      (__hip_fp8_e4m3_fnuz *)A.data_ptr(), (__hip_fp8_e4m3_fnuz *)B.data_ptr(),
      A_scale.data_ptr<float>(), B_scale.data_ptr<float>(),
      (__hip_bfloat16 *)C.data_ptr(), N, K, M);
  return C;
}
"""

cpp_src = r"""
at::Tensor fp8_mm(at::Tensor A, at::Tensor B, at::Tensor A_scale,
                  at::Tensor B_scale, at::Tensor C);
"""

module = load_inline(
    name="fp8_mm",
    cpp_sources=[cpp_src],
    cuda_sources=[cuda_src],
    functions=["fp8_mm"],
    verbose=True,
    extra_cuda_cflags=["-O3", "--offload-arch=gfx942", "-std=c++20"],
)


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

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