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template-hip.py
curl "https://kernelindex.com/api/v1/implementations/kernelbot-amd-fp8-mm-23394?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
61.4µs
#75 of 98
2025-05-17
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 256]
AMD Instinct MI300X
67.6µs
#80 of 98
2025-05-17
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 1536]
AMD Instinct MI300X
76.4µs
#58 of 98
2025-05-17
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=576 · seed=12346
AMD Instinct MI300X
125.1µs
#53 of 98
2025-05-17
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 512]
AMD Instinct MI300X
129.1µs
#55 of 98
2025-05-17
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 256]
AMD Instinct MI300X
129.8µs
#58 of 98
2025-05-17
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=512 · seed=6563
AMD Instinct MI300X
147.6µs
#60 of 98
2025-05-17
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 2304]
AMD Instinct MI300X
150.2µs
#50 of 98
2025-05-17
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 2048]
AMD Instinct MI300X
150.7µs
#61 of 98
2025-05-17
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=1536 · seed=8135
AMD Instinct MI300X
157.1µs
#42 of 98
2025-05-17
Run →
Show all 18 measurements ›
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 1536]
AMD Instinct MI300X
183.7µs
#38 of 98
2025-05-17
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=512 · seed=12341
AMD Instinct MI300X
210.6µs
#47 of 98
2025-05-17
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=576 · seed=9863
AMD Instinct MI300X
215.7µs
#43 of 98
2025-05-17
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=4608 · seed=7531
AMD Instinct MI300X
222.9µs
#42 of 98
2025-05-17
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=1536 · seed=6543
AMD Instinct MI300X
370.5µs
#41 of 98
2025-05-17
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 2048]
AMD Instinct MI300X
453.1µs
#36 of 98
2025-05-17
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 2304]
AMD Instinct MI300X
474.0µs
#31 of 98
2025-05-17
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=4608 · seed=65436
AMD Instinct MI300X
927.3µs
#30 of 98
2025-05-17
Run →
Reported · How evidence levels are derived →
Source and license

sourceavailable
revision digestsha256:f08faaa9c434f5c2d105a78888ca9ae51c3298471126fee4318c125b04fdd3d3
license declaredunknown
license concludedunknown
imported2026-08-15
Kernel source

template-hip.py1 lines
# This script provides a template for using load_inline to run a HIP kernel for
import torch
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, torch::Tensor aT, torch::Tensor bT);
"""

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

using fp8_raw_t = uint8_t;
using fp8x8_t = fp8_raw_t __attribute((ext_vector_type(8)));
using fp32x2_t = float __attribute((ext_vector_type(2)));
using fp32x4_t = float __attribute((ext_vector_type(4)));
using fp32x16_t = float __attribute((ext_vector_type(16)));

constexpr const int BLOCK = 128;

template <typename Y, typename X>
__device__ constexpr Y bit_cast(const X &x)
{
  return __builtin_bit_cast(Y, x);
}
__global__ void permute_kernel(__hip_fp8_e4m3_fnuz *output,
                               const __hip_fp8_e4m3_fnuz *input,
                               const int mn,
                               const int k)
{
  __shared__ __hip_fp8_e4m3_fnuz shbuf[32 * (32 + 1)];
  const int32_t warp_id = threadIdx.y;
  const int32_t lane_id = threadIdx.x;
  const int32_t k_id = blockIdx.y * 32;
  const int32_t mn_id = blockIdx.x * 32;

  const size_t input_idx = (k_id + warp_id) * mn + mn_id + lane_id;

  const int lane_id_x_33 = lane_id * 33;
#pragma unroll
  for (int kLoopIdx = 0; kLoopIdx < 4; kLoopIdx++)
  {
    shbuf[lane_id_x_33 + warp_id + kLoopIdx * 8] = input[input_idx + kLoopIdx * 8 * mn];
  }
  __syncthreads();

  const int32_t kiOut = k_id + lane_id;
  int mnI = warp_id;
#pragma unroll
  for (int mnLoopIdx = 0; mnLoopIdx < 4; ++mnLoopIdx)
  {
    output[kiOut + (mn_id + mnI) * k] = shbuf[(mnI) * 33 + lane_id];
    mnI += 8;
  }
}
__global__ __launch_bounds__(256, 2) void fp8_128x128_kernel(const __hip_fp8_e4m3_fnuz *a, const __hip_fp8_e4m3_fnuz *b, const float *as, const float *bs,
                              __hip_bfloat16 *c, int m, int n, int k)
{
  const int BLOCKM=128;
  const int BLOCKN=128;
  // Your implementation here
  int bx = blockIdx.x;
  int by = blockIdx.y;

  int tid = threadIdx.x;
  int lane_id = threadIdx.x % 64;
  int warp_id = threadIdx.x / 64;
  int lane_mod32 = lane_id % 32;
  int lane_div32 = lane_id / 32;
  int lane_mod16 = lane_id % 16;
  int lane_div16 = lane_id / 16;
  int lane_mod8 = lane_id % 8;
  int lane_div8 = lane_id / 8;
  int warp_mod2 = warp_id % 2;
  int warp_div2 = warp_id / 2;
  // smem
  __shared__ char smem[((BLOCKM + BLOCKN) * BLOCK) * sizeof(__hip_fp8_e4m3_fnuz) + (1 + BLOCKM) * sizeof(float)];
  __hip_fp8_e4m3_fnuz *smemA = reinterpret_cast<__hip_fp8_e4m3_fnuz *>(smem);
  __hip_fp8_e4m3_fnuz *smemB = reinterpret_cast<__hip_fp8_e4m3_fnuz *>(smem + BLOCKM * BLOCK * sizeof(__hip_fp8_e4m3_fnuz));
  float *smem_scales_a = reinterpret_cast<float *>(smem + (BLOCKM + BLOCKN) * BLOCK * sizeof(__hip_fp8_e4m3_fnuz));
  float *smem_scales_b = reinterpret_cast<float *>(smem + ((BLOCKM + BLOCKN) * BLOCK) * sizeof(__hip_fp8_e4m3_fnuz) + BLOCKM * sizeof(float));


  int gemm_rowA = bx * BLOCKM + warp_id * 32 + lane_div8;
  int gemm_col = lane_mod8 * 16;
  int gemm_rowB = by * BLOCKN + warp_id * 32 + lane_div8;
  int A_ldg_idx = gemm_rowA * k + gemm_col;
  int B_ldg_idx = gemm_rowB * k + gemm_col;
  // ldg
  fp32x4_t A_ldg_reg[4];
  fp32x4_t B_ldg_reg[4];
  for (int i = 0; i < 4; i++)
  {
    A_ldg_reg[i] = *(fp32x4_t *)(&a[A_ldg_idx + i * 8 * k]);
    B_ldg_reg[i] = *(fp32x4_t *)(&b[B_ldg_idx + i * 8 * k]);
  }
  A_ldg_idx += BLOCK;
  B_ldg_idx += BLOCK;

  int A_sts_idx = (warp_id * 32 + lane_div8) * 128 + (lane_mod8 ^ lane_div8) * 16;
  int B_sts_idx = (warp_id * 32 + lane_div8) * 128 + (lane_mod8 ^ lane_div8) * 16;
  
  int lds_row = lane_mod32;

  int A_lds_idx[4];
  int B_lds_idx[4];

  for (int i = 0; i < 4; i++){
    int lds_col = ((lane_div32 + 2 * i) % 8) ^ (lds_row % 8);
    A_lds_idx[i] = (warp_div2 * 64 * 128) + lds_row * 128 + lds_col * 16;
    B_lds_idx[i] = (warp_mod2 * 64 * 128) + lds_row * 128 + lds_col * 16;
  }

  int sn = (n + BLOCK - 1) / BLOCK;

  as += BLOCKM * blockIdx.x;
  bs += BLOCKN * blockIdx.y / BLOCK;
  c += BLOCKN * blockIdx.y + BLOCKM * blockIdx.x * n;

  fp32x16_t acc[2][2];
  for (int i = 0; i < 2; i++)
  {
    for (int j = 0; j < 2; j++)
    {
      acc[i][j] = {0.0f};
    }
  }

  __hip_fp8_e4m3_fnuz A_lds_reg[2][2][8];
  __hip_fp8_e4m3_fnuz B_lds_reg[2][2][8];
  float A_scale_lds_reg[2][16];
  float B_scale_lds_reg;

  // sts
  *(fp32x4_t *)(&smemA[A_sts_idx + 0 * 8 * 128]) = A_ldg_reg[0];
  *(fp32x4_t *)(&smemB[B_sts_idx + 0 * 8 * 128]) = B_ldg_reg[0];
  *(fp32x4_t *)(&smemA[A_sts_idx + 1 * 8 * 128]) = A_ldg_reg[1];
  *(fp32x4_t *)(&smemB[B_sts_idx + 1 * 8 * 128]) = B_ldg_reg[1];
  *(fp32x4_t *)(&smemA[A_sts_idx + 2 * 8 * 128]) = A_ldg_reg[2];
  *(fp32x4_t *)(&smemB[B_sts_idx + 2 * 8 * 128]) = B_ldg_reg[2];
  *(fp32x4_t *)(&smemA[A_sts_idx + 3 * 8 * 128]) = A_ldg_reg[3];
  *(fp32x4_t *)(&smemB[B_sts_idx + 3 * 8 * 128]) = B_ldg_reg[3];
  if (tid < BLOCKM)
  {
    smem_scales_a[tid] = as[tid];
  }
  if (tid == 0)
  {
    smem_scales_b[0] = bs[0];
  }
  as += m;
  bs += sn;
  for (int itile = BLOCK; itile < k; itile += BLOCK)
  {

    fp32x16_t block_acc[2][2];
    for (int i = 0; i < 2; i++)
    {
      for (int j = 0; j < 2; j++)
      {
        block_acc[i][j] = {0.0f};
      }
    }
    // ldg
    A_ldg_reg[0] = *(fp32x4_t *)(&a[A_ldg_idx + 0 * 8 * k]);
    B_ldg_reg[0] = *(fp32x4_t *)(&b[B_ldg_idx + 0 * 8 * k]);
    A_ldg_reg[1] = *(fp32x4_t *)(&a[A_ldg_idx + 1 * 8 * k]);
    B_ldg_reg[1] = *(fp32x4_t *)(&b[B_ldg_idx + 1 * 8 * k]);
    A_ldg_reg[2] = *(fp32x4_t *)(&a[A_ldg_idx + 2 * 8 * k]);
    B_ldg_reg[2] = *(fp32x4_t *)(&b[B_ldg_idx + 2 * 8 * k]);
    A_ldg_reg[3] = *(fp32x4_t *)(&a[A_ldg_idx + 3 * 8 * k]);
    B_ldg_reg[3] = *(fp32x4_t *)(&b[B_ldg_idx + 3 * 8 * k]);
    A_ldg_idx += BLOCK;
    B_ldg_idx += BLOCK;

    __syncthreads();

    for (int i = 0; i < 2; i++)
    {
      for (int k = 0; k < 16; k++)
      {
        A_scale_lds_reg[i][k] = smem_scales_a[(k % 4) + lane_div32 * 4 + (k / 4) * 8 + warp_div2 * 64 + 32 * i];
      }
    }
    B_scale_lds_reg = smem_scales_b[0];

    for (int k_step = 0; k_step < 4; k_step++)
    {
      // lds
      *(fp32x4_t *)(&A_lds_reg[0]) = *(fp32x4_t *)(&smemA[A_lds_idx[k_step] + 0 * 32 * 128]);
      *(fp32x4_t *)(&B_lds_reg[0]) = *(fp32x4_t *)(&smemB[B_lds_idx[k_step] + 0 * 32 * 128]);
      *(fp32x4_t *)(&A_lds_reg[1]) = *(fp32x4_t *)(&smemA[A_lds_idx[k_step] + 1 * 32 * 128]);
      *(fp32x4_t *)(&B_lds_reg[1]) = *(fp32x4_t *)(&smemB[B_lds_idx[k_step] + 1 * 32 * 128]);

      for (int i = 0; i < 2; i++)
      {
        for (int j = 0; j < 2; j++)
        {
          block_acc[i][j] = __builtin_amdgcn_mfma_f32_32x32x16_fp8_fp8(
              bit_cast<long>(A_lds_reg[i][0]), bit_cast<long>(B_lds_reg[j][0]), block_acc[i][j], 0, 0, 0);
          block_acc[i][j] = __builtin_amdgcn_mfma_f32_32x32x16_fp8_fp8(
              bit_cast<long>(A_lds_reg[i][1]), bit_cast<long>(B_lds_reg[j][1]), block_acc[i][j], 0, 0, 0);
        }
      }
    }
    for (int i = 0; i < 2; ++i)
    {
      for (int j = 0; j < 2; ++j)
      {
        for (int k = 0; k < 16; ++k)
        {
          acc[i][j][k] += block_acc[i][j][k] * A_scale_lds_reg[i][k] * B_scale_lds_reg;
        }
      }
    }

    __syncthreads();

    // sts
    *(fp32x4_t *)(&smemA[A_sts_idx + 0 * 8 * 128]) = A_ldg_reg[0];
    *(fp32x4_t *)(&smemB[B_sts_idx + 0 * 8 * 128]) = B_ldg_reg[0];
    *(fp32x4_t *)(&smemA[A_sts_idx + 1 * 8 * 128]) = A_ldg_reg[1];
    *(fp32x4_t *)(&smemB[B_sts_idx + 1 * 8 * 128]) = B_ldg_reg[1];
    *(fp32x4_t *)(&smemA[A_sts_idx + 2 * 8 * 128]) = A_ldg_reg[2];
    *(fp32x4_t *)(&smemB[B_sts_idx + 2 * 8 * 128]) = B_ldg_reg[2];
    *(fp32x4_t *)(&smemA[A_sts_idx + 3 * 8 * 128]) = A_ldg_reg[3];
    *(fp32x4_t *)(&smemB[B_sts_idx + 3 * 8 * 128]) = B_ldg_reg[3];
    if (tid < BLOCKM)
    {
      smem_scales_a[tid] = as[tid];
    }
    if (tid == 0)
    {
      smem_scales_b[0] = bs[0];
    }
    as += m;
    bs += sn;
  }

  fp32x16_t block_acc[2][2];
  for (int i = 0; i < 2; i++)
  {
    for (int j = 0; j < 2; j++)
    {
      block_acc[i][j] = {0.0f};
    }
  }
  __syncthreads();
  for (int i = 0; i < 2; i++)
  {
    for (int k = 0; k < 16; k++)
    {
      A_scale_lds_reg[i][k] = smem_scales_a[(k % 4) + lane_div32 * 4 + (k / 4) * 8 + warp_div2 * 64 + 32 * i];
    }
  }
  B_scale_lds_reg = smem_scales_b[0];

  for (int k_step = 0; k_step < 4; k_step++)
  {
    // lds
    *(fp32x4_t *)(&A_lds_reg[0]) = *(fp32x4_t *)(&smemA[A_lds_idx[k_step] + 0 * 32 * 128]);
    *(fp32x4_t *)(&B_lds_reg[0]) = *(fp32x4_t *)(&smemB[B_lds_idx[k_step] + 0 * 32 * 128]);
    *(fp32x4_t *)(&A_lds_reg[1]) = *(fp32x4_t *)(&smemA[A_lds_idx[k_step] + 1 * 32 * 128]);
    *(fp32x4_t *)(&B_lds_reg[1]) = *(fp32x4_t *)(&smemB[B_lds_idx[k_step] + 1 * 32 * 128]);

    for (int i = 0; i < 2; i++)
    {
      for (int j = 0; j < 2; j++)
      {
        block_acc[i][j] = __builtin_amdgcn_mfma_f32_32x32x16_fp8_fp8(
            bit_cast<long>(A_lds_reg[i][0]), bit_cast<long>(B_lds_reg[j][0]), block_acc[i][j], 0, 0, 0);
        block_acc[i][j] = __builtin_amdgcn_mfma_f32_32x32x16_fp8_fp8(
            bit_cast<long>(A_lds_reg[i][1]), bit_cast<long>(B_lds_reg[j][1]), block_acc[i][j], 0, 0, 0);
      }
    }
  }
  for (int i = 0; i < 2; ++i)
  {
    for (int j = 0; j < 2; ++j)
    {
      for (int k = 0; k < 16; ++k)
      {
        acc[i][j][k] += block_acc[i][j][k] * A_scale_lds_reg[i][k] * B_scale_lds_reg;
      }
    }
  }

  // finally, write the result as bf16
  for (int i = 0; i < 2; ++i)
  {
    for (int j = 0; j < 2; ++j)
    {
      for (int k = 0; k < 16; ++k)
      {
        int C_stg_idx = (lane_mod32 + warp_mod2 * 64 + 32 * j) + ((k % 4) + lane_div32 * 4 + (k / 4) * 8 + warp_div2 * 64 + 32 * i) * n;
        c[C_stg_idx] = (__hip_bfloat16)acc[i][j][k];
      }
    }
  }
}

__global__ __launch_bounds__(256, 2) void fp8_128x64_kernel(const __hip_fp8_e4m3_fnuz *a, const __hip_fp8_e4m3_fnuz *b, const float *as, const float *bs,
                              __hip_bfloat16 *c, int m, int n, int k)
{
  const int BLOCKM=128;
  const int BLOCKN=64;
// Your implementation here
  int bx = blockIdx.x;
  int by = blockIdx.y;

  int tid = threadIdx.x;
  int lane_id = threadIdx.x % 64;
  int warp_id = threadIdx.x / 64;
  int lane_mod32 = lane_id % 32;
  int lane_div32 = lane_id / 32;
  int lane_mod16 = lane_id % 16;
  int lane_div16 = lane_id / 16;
  int lane_mod8 = lane_id % 8;
  int lane_div8 = lane_id / 8;
  int warp_mod2 = warp_id % 2;
  int warp_div2 = warp_id / 2;

  int gemm_rowA = bx * BLOCKM + warp_id * 32 + lane_div8;
  int gemm_col = lane_mod8 * 16;

  int gemm_rowB = by * BLOCKN + warp_id * 16 + lane_div8;

  int A_ldg_idx = gemm_rowA * k + gemm_col;
  int B_ldg_idx = gemm_rowB * k + gemm_col;

  int A_sts_idx = (warp_id * 32 + lane_div8) * 128 + (lane_mod8 ^ lane_div8) * 16;
  int B_sts_idx = (warp_id * 16 + lane_div8) * 128 + (lane_mod8 ^ lane_div8) * 16;
  
  int lds_row = lane_mod32;

  int A_lds_idx[4];
  int B_lds_idx[4];

  for (int i = 0; i < 4; i++){
    int lds_col = ((lane_div32 + 2 * i) % 8) ^ (lds_row % 8);
    A_lds_idx[i] = (warp_div2 * 64 * 128) + lds_row * 128 + lds_col * 16;
    B_lds_idx[i] = (warp_mod2 * 32 * 128) + lds_row * 128 + lds_col * 16;
  }

  int sn = (n + BLOCK - 1) / BLOCK;

  as += BLOCKM * blockIdx.x;
  bs += BLOCKN * blockIdx.y / BLOCK;
  c += BLOCKN * blockIdx.y + BLOCKM * blockIdx.x * n;
  // smem
  __shared__ char smem[((BLOCKM + BLOCKN) * BLOCK) * sizeof(__hip_fp8_e4m3_fnuz) + (1 + BLOCKM) * sizeof(float)];
  __hip_fp8_e4m3_fnuz *smemA = reinterpret_cast<__hip_fp8_e4m3_fnuz *>(smem);
  __hip_fp8_e4m3_fnuz *smemB = reinterpret_cast<__hip_fp8_e4m3_fnuz *>(smem + BLOCKM * BLOCK * sizeof(__hip_fp8_e4m3_fnuz));
  float *smem_scales_a = reinterpret_cast<float *>(smem + (BLOCKM + BLOCKN) * BLOCK * sizeof(__hip_fp8_e4m3_fnuz));
  float *smem_scales_b = reinterpret_cast<float *>(smem + ((BLOCKM + BLOCKN) * BLOCK) * sizeof(__hip_fp8_e4m3_fnuz) + BLOCKM * sizeof(float));

  fp32x16_t acc[2][1];
  for (int i = 0; i < 2; i++)
  {
    for (int j = 0; j < 1; j++)
    {
      acc[i][j] = {0.0f};
    }
  }

  fp32x4_t A_ldg_reg[4];
  fp32x4_t B_ldg_reg[2];

  __hip_fp8_e4m3_fnuz A_lds_reg[2][2][8];
  __hip_fp8_e4m3_fnuz B_lds_reg[1][2][8];
  float A_scale_lds_reg[2][16];
  float B_scale_lds_reg;

  for (int itile = 0; itile < k; itile += BLOCK)
  {

    fp32x16_t block_acc[2][1];
    for (int i = 0; i < 2; i++)
    {
      for (int j = 0; j < 1; j++)
      {
        block_acc[i][j] = {0.0f};
      }
    }
    // ldg
    for (int i = 0; i < 4; i++)
    {
      A_ldg_reg[i] = *(fp32x4_t *)(&a[A_ldg_idx + i * 8 * k]);
    }
    for (int i = 0; i < 2; i++)
    {
      B_ldg_reg[i] = *(fp32x4_t *)(&b[B_ldg_idx + i * 8 * k]);
    }
    A_ldg_idx += BLOCK;
    B_ldg_idx += BLOCK;
    // sts
    for (int i = 0; i < 4; i++)
    {
      *(fp32x4_t *)(&smemA[A_sts_idx + i * 8 * 128]) = A_ldg_reg[i];
    }
    for (int i = 0; i < 2; i++)
    {
      *(fp32x4_t *)(&smemB[B_sts_idx + i * 8 * 128]) = B_ldg_reg[i];
    }
    if (tid < BLOCKM)
    {
      smem_scales_a[tid] = as[tid];
    }
    if (tid == 0)
    {
      smem_scales_b[0] = bs[0];
    }
    __syncthreads();

    for (int i = 0; i < 2; i++)
    {
      for (int k = 0; k < 16; k++)
      {
        A_scale_lds_reg[i][k] = smem_scales_a[(k % 4) + lane_div32 * 4 + (k / 4) * 8 + warp_div2 * 64 + 32 * i];
      }
    }
    B_scale_lds_reg = smem_scales_b[0];

    for (int k_step = 0; k_step < 4; k_step++)
    {
      // lds
      for (int i = 0; i < 2; i++)
      {
        *(fp32x4_t *)(&A_lds_reg[i]) = *(fp32x4_t *)(&smemA[A_lds_idx[k_step] + i * 32 * 128]);
      }
      for (int j = 0; j < 1; j++)
      {
        *(fp32x4_t *)(&B_lds_reg[j]) = *(fp32x4_t *)(&smemB[B_lds_idx[k_step] + j * 32 * 128]);
      }

      for (int i = 0; i < 2; i++)
      {
        for (int j = 0; j < 1; j++)
        {
          block_acc[i][j] = __builtin_amdgcn_mfma_f32_32x32x16_fp8_fp8(
              bit_cast<long>(A_lds_reg[i][0]), bit_cast<long>(B_lds_reg[j][0]), block_acc[i][j], 0, 0, 0);
          block_acc[i][j] = __builtin_amdgcn_mfma_f32_32x32x16_fp8_fp8(
              bit_cast<long>(A_lds_reg[i][1]), bit_cast<long>(B_lds_reg[j][1]), block_acc[i][j], 0, 0, 0);
        }
      }
    }

    for (int i = 0; i < 2; ++i)
    {
      for (int j = 0; j < 1; ++j)
      {
        for (int k = 0; k < 16; ++k)
        {
          acc[i][j][k] += block_acc[i][j][k] * A_scale_lds_reg[i][k] * B_scale_lds_reg;
        }
      }
    }
    as += m;
    bs += sn;
    __syncthreads();
  }

  // finally, write the result as bf16
  for (int i = 0; i < 2; ++i)
  {
    for (int j = 0; j < 1; ++j)
    {
      for (int k = 0; k < 16; ++k)
      {
        int C_stg_idx = (lane_mod32 + warp_mod2 * 32 + 32 * j) + ((k % 4) + lane_div32 * 4 + (k / 4) * 8 + warp_div2 * 64 + 32 * i) * n;
        c[C_stg_idx] = (__hip_bfloat16)acc[i][j][k];
      }
    }
  }
}

__global__ void fp8_64x64_kernel(const __hip_fp8_e4m3_fnuz *a, const __hip_fp8_e4m3_fnuz *b, const float *as, const float *bs,
                              __hip_bfloat16 *c, int m, int n, int k)
{
  const int BLOCKM=64;
  const int BLOCKN=64;
// Your implementation here
  int bx = blockIdx.x;
  int by = blockIdx.y;

  int tid = threadIdx.x;
  int lane_id = threadIdx.x % 64;
  int warp_id = threadIdx.x / 64;
  int lane_mod8 = lane_id % 8;
  int lane_div8 = lane_id / 8;
  int lane_mod16 = lane_id % 16;
  int lane_div16 = lane_id / 16;
  int warp_mod2 = warp_id % 2;
  int warp_div2 = warp_id / 2;

  int gemm_rowA = bx * BLOCKM + warp_id * 16 + lane_div8;
  int gemm_col = lane_mod8 * 16;

  int gemm_rowB = by * BLOCKN + warp_id * 16 + lane_div8;

  int A_ldg_idx = gemm_rowA * k + gemm_col;
  int B_ldg_idx = gemm_rowB * k + gemm_col;

  int A_sts_idx = (warp_id * 16 + lane_div8) * 128 + (lane_mod8 ^ lane_div8) * 16;
  int B_sts_idx = (warp_id * 16 + lane_div8) * 128 + (lane_mod8 ^ lane_div8) * 16;

  int lds_row = (lane_mod16);
  int lds_col0 = ((lane_div16) % 8) ^ (lds_row % 8);
  int lds_col1 = (((lane_div16) + 4) % 8) ^ (lds_row % 8);
  int A_lds_idx0 = (warp_div2 * 32 * 128) + lds_row * 128 + lds_col0 * 16;
  int B_lds_idx0 = (warp_mod2 * 32 * 128) + lds_row * 128 + lds_col0 * 16;
  int A_lds_idx1 = (warp_div2 * 32 * 128) + lds_row * 128 + lds_col1 * 16;
  int B_lds_idx1 = (warp_mod2 * 32 * 128) + lds_row * 128 + lds_col1 * 16;

  int sn = (n + BLOCK - 1) / BLOCK;

  as += BLOCKM * blockIdx.x;
  bs += BLOCKN * blockIdx.y / BLOCK;
  c += BLOCKN * blockIdx.y + BLOCKM * blockIdx.x * n;
  // smem
  __shared__ char smem[((BLOCKM + BLOCKN) * BLOCK) * sizeof(__hip_fp8_e4m3_fnuz) + (1 + BLOCKM) * sizeof(float)];
  __hip_fp8_e4m3_fnuz *smemA = reinterpret_cast<__hip_fp8_e4m3_fnuz *>(smem);
  __hip_fp8_e4m3_fnuz *smemB = reinterpret_cast<__hip_fp8_e4m3_fnuz *>(smem + BLOCKM * BLOCK * sizeof(__hip_fp8_e4m3_fnuz));
  float *smem_scales_a = reinterpret_cast<float *>(smem + (BLOCKM + BLOCKN) * BLOCK * sizeof(__hip_fp8_e4m3_fnuz));
  float *smem_scales_b = reinterpret_cast<float *>(smem + ((BLOCKM + BLOCKN) * BLOCK) * sizeof(__hip_fp8_e4m3_fnuz) + BLOCKM * sizeof(float));

  fp32x4_t acc[2][2];
  for (int i = 0; i < 2; i++)
  {
    for (int j = 0; j < 2; j++)
    {
      acc[i][j] = {0.0f};
    }
  }

  fp32x4_t A_ldg_reg[2];
  fp32x4_t B_ldg_reg[2];

  __hip_fp8_e4m3_fnuz A_lds_reg[2][2][8];
  __hip_fp8_e4m3_fnuz B_lds_reg[2][2][8];
  float A_scale_lds_reg[2][4];
  float B_scale_lds_reg;

  for (int itile = 0; itile < k; itile += BLOCK)
  {

    fp32x4_t block_acc[2][2];
    for (int i = 0; i < 2; i++)
    {
      for (int j = 0; j < 2; j++)
      {
        block_acc[i][j] = {0.0f};
      }
    }
    // ldg
    for (int i = 0; i < 2; i++)
    {
      A_ldg_reg[i] = *(fp32x4_t *)(&a[A_ldg_idx + i * 8 * k]);
      B_ldg_reg[i] = *(fp32x4_t *)(&b[B_ldg_idx + i * 8 * k]);
    }
    A_ldg_idx += BLOCK;
    B_ldg_idx += BLOCK;
    // sts
    for (int i = 0; i < 2; i++)
    {
      *(fp32x4_t *)(&smemA[A_sts_idx + i * 8 * 128]) = A_ldg_reg[i];
      *(fp32x4_t *)(&smemB[B_sts_idx + i * 8 * 128]) = B_ldg_reg[i];
    }
    if (warp_id < 1)
    {
      smem_scales_a[tid] = as[tid];
    }
    if (tid == 0)
    {
      smem_scales_b[0] = bs[0];
    }
    __syncthreads();

    for (int i = 0; i < 2; i++)
    {
      for (int k = 0; k < 4; k++)
      {
        A_scale_lds_reg[i][k] = smem_scales_a[k + lane_div16 * 4 + warp_div2 * 32 + 16 * i];
      }
    }
    B_scale_lds_reg = smem_scales_b[0];

    for (int i = 0; i < 2; i++)
    {
      *(fp32x4_t *)(&A_lds_reg[i]) = *(fp32x4_t *)(&smemA[A_lds_idx0 + i * 16 * 128]);
    }
    for (int j = 0; j < 2; j++)
    {
      *(fp32x4_t *)(&B_lds_reg[j]) = *(fp32x4_t *)(&smemB[B_lds_idx0 + j * 16 * 128]);
    }

    for (int i = 0; i < 2; i++)
    {
      for (int j = 0; j < 2; j++)
      {
        block_acc[i][j] = __builtin_amdgcn_mfma_f32_16x16x32_fp8_fp8(
            bit_cast<long>(A_lds_reg[i][0]), bit_cast<long>(B_lds_reg[j][0]), block_acc[i][j], 0, 0, 0);
      }
    }
    for (int i = 0; i < 2; i++)
    {
      for (int j = 0; j < 2; j++)
      {
        block_acc[i][j] = __builtin_amdgcn_mfma_f32_16x16x32_fp8_fp8(
            bit_cast<long>(A_lds_reg[i][1]), bit_cast<long>(B_lds_reg[j][1]), block_acc[i][j], 0, 0, 0);
      }
    }

    for (int i = 0; i < 2; i++)
    {
      *(fp32x4_t *)(&A_lds_reg[i]) = *(fp32x4_t *)(&smemA[A_lds_idx1 + i * 16 * 128]);
    }
    for (int j = 0; j < 2; j++)
    {
      *(fp32x4_t *)(&B_lds_reg[j]) = *(fp32x4_t *)(&smemB[B_lds_idx1 + j * 16 * 128]);
    }

    for (int i = 0; i < 2; i++)
    {
      for (int j = 0; j < 2; j++)
      {
        block_acc[i][j] = __builtin_amdgcn_mfma_f32_16x16x32_fp8_fp8(
            bit_cast<long>(A_lds_reg[i][0]), bit_cast<long>(B_lds_reg[j][0]), block_acc[i][j], 0, 0, 0);
      }
    }
    for (int i = 0; i < 2; i++)
    {
      for (int j = 0; j < 2; j++)
      {
        block_acc[i][j] = __builtin_amdgcn_mfma_f32_16x16x32_fp8_fp8(
            bit_cast<long>(A_lds_reg[i][1]), bit_cast<long>(B_lds_reg[j][1]), block_acc[i][j], 0, 0, 0);
      }
    }

    for (int i = 0; i < 2; ++i)
    {
      for (int j = 0; j < 2; ++j)
      {
        for (int k = 0; k < 4; ++k)
        {
          acc[i][j][k] += block_acc[i][j][k] * A_scale_lds_reg[i][k] * B_scale_lds_reg;
        }
      }
    }
    as += m;
    bs += sn;
    __syncthreads();
  }

  // finally, write the result as bf16
  for (int i = 0; i < 2; ++i)
  {
    for (int j = 0; j < 2; ++j)
    {
      for (int k = 0; k < 4; ++k)
      {
        int C_stg_idx = (lane_mod16 + warp_mod2 * 32 + 16 * j) + (k + lane_div16 * 4 + warp_div2 * 32 + 16 * i) * n;
        c[C_stg_idx] = (__hip_bfloat16)acc[i][j][k];
      }
    }
  }
}


void fp8_mm(torch::Tensor a, torch::Tensor b, torch::Tensor as, torch::Tensor bs, torch::Tensor c, torch::Tensor aT, torch::Tensor bT)
{
  int m = a.size(0);
  int n = b.size(0);
  int k = a.size(1);

  permute_kernel<<<dim3((m + 32 - 1) / 32, (k + 32 - 1) / 32), dim3(32, 8), 0, 0>>>((__hip_fp8_e4m3_fnuz *)aT.data_ptr(), (__hip_fp8_e4m3_fnuz *)a.data_ptr(), m, k);
  permute_kernel<<<dim3((n + 32 - 1) / 32, (k + 32 - 1) / 32), dim3(32, 8), 0, 0>>>((__hip_fp8_e4m3_fnuz *)bT.data_ptr(), (__hip_fp8_e4m3_fnuz *)b.data_ptr(), n, k);

  if(m % 128 == 0 && n % 128 == 0){
    fp8_128x128_kernel<<<dim3((m + 128 - 1) / 128, (n + 128 - 1) / 128), dim3(256), 0, 0>>>((__hip_fp8_e4m3_fnuz *)aT.data_ptr(), (__hip_fp8_e4m3_fnuz *)bT.data_ptr(),
                                                                                                 as.data_ptr<float>(), bs.data_ptr<float>(), (__hip_bfloat16 *)c.data_ptr(), m, n, k);
  }else{
    fp8_64x64_kernel<<<dim3((m + 64 - 1) / 64, (n + 64 - 1) / 64), dim3(256), 0, 0>>>((__hip_fp8_e4m3_fnuz *)aT.data_ptr(), (__hip_fp8_e4m3_fnuz *)bT.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
    m = a.shape[0]
    n = b.shape[0]
    k = a.shape[1]
    aT = (torch.empty((k, m), dtype=torch.bfloat16, device="cuda")).to(torch.float8_e4m3fnuz)
    bT = (torch.empty((k, n), dtype=torch.bfloat16, device="cuda")).to(torch.float8_e4m3fnuz)

    module.fp8_mm(a, b, a_scale, b_scale, c, aT, bT)

    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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