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submission 9802

KernelBot user 292 · 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.

test_K64.py
curl "https://kernelindex.com/api/v1/implementations/kernelbot-amd-fp8-mm-9802?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
49.7µs
#58 of 98
2025-04-26
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 512]
AMD Instinct MI300X
54.5µs
#65 of 98
2025-04-26
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 1536]
AMD Instinct MI300X
89.2µs
#66 of 98
2025-04-26
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 256]
AMD Instinct MI300X
186.6µs
#80 of 98
2025-04-26
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 512]
AMD Instinct MI300X
186.7µs
#79 of 98
2025-04-26
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 2048]
AMD Instinct MI300X
207.1µs
#76 of 98
2025-04-26
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 2304]
AMD Instinct MI300X
226.3µs
#75 of 98
2025-04-26
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=576 · seed=12346
AMD Instinct MI300X
259.8µs
#80 of 98
2025-04-26
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=512 · seed=6563
AMD Instinct MI300X
260.1µs
#80 of 98
2025-04-26
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=1536 · seed=8135
AMD Instinct MI300X
264.8µs
#73 of 98
2025-04-26
Run →
Show all 18 measurements ›
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=512 · seed=12341
AMD Instinct MI300X
351.2µs
#70 of 98
2025-04-26
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 1536]
AMD Instinct MI300X
354.3µs
#79 of 98
2025-04-26
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=576 · seed=9863
AMD Instinct MI300X
440.7µs
#70 of 98
2025-04-26
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [1024, 7168] · n=4608 · seed=7531
AMD Instinct MI300X
452.8µs
#79 of 98
2025-04-26
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=1536 · seed=6543
AMD Instinct MI300X
854.9µs
#77 of 98
2025-04-26
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 2048]
AMD Instinct MI300X
1.03ms
#79 of 98
2025-04-26
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 2304]
AMD Instinct MI300X
1.15ms
#79 of 98
2025-04-26
Run →
AMD FP8 blockwise GEMMfp32/fp8_e4m3fnuz · [6144, 7168] · n=4608 · seed=65436
AMD Instinct MI300X
2.43ms
#79 of 98
2025-04-26
Run →

Reported · How evidence levels are derived →

Source and license

sourceavailable
revision digestsha256:3cb9870fc22ab2a9bc814ab2e57afa82df1589ea8c8d61bc7477e5f4498b5a30
license declaredunknown
license concludedunknown
imported2026-08-15

Kernel source

test_K64.py1 lines
# 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>
#include <rocwmma/rocwmma.hpp>
#include <cooperative_groups.h>
namespace cg = cooperative_groups;

using floatx16 = __attribute__((__vector_size__(16 * sizeof(float)))) float;

#define K_JUMP 128
#define WMMA_M 32
#define WMMA_N 32
#define WMMA_K 16
#define WARP_SIZE 64
#define WMMA_PLACEHOLDER 4

__global__ void custom_kernel(const __hip_fp8_e4m3_fnuz* A_ptr, const __hip_fp8_e4m3_fnuz* B_ptr, const float* As_ptr, const float* Bs_ptr, rocwmma::bfloat16_t* C_ptr, int M, int N, int K) {
    /*
    a block covers 32x32x4 elem
    num_warp_x = 4
    num_warp_y = 1
    block size = ((64 * num_warp_x), num_warp_y) = 256 threads
    grid size = (N / (num_warp_x * WMMA_N), M / (num_warp_y * WMMA_M))

    A: M x K col-maj  --- As (1x128 scaling): M x K/128 col-maj
    B: K x N row-maj  --- Bs (128x128 scaling): K/128 x N/128 row-maj
    C: M x N row-maj
    M, N is divisible by 64
    K is divisible by 128
    */      
    int warp_idx_x = threadIdx.x / WARP_SIZE;
    //int warp_idx_y = threadIdx.y;
    
    int lda = M;
    int ldb = N;
    int ldc = N;
    
    int sn = (N + 128 - 1) / 128;

    //int row_base_C = (blockIdx.y * blockDim.y + threadIdx.y) * WMMA_M; // add this line causes the code to be 2x slower
    
    int row_base_C = blockIdx.y * WMMA_M;
    int col_base_C = (blockIdx.x * blockDim.x / WARP_SIZE + warp_idx_x) * WMMA_N;

    //int col_base_C = (blockIdx.x * 2 + warp_idx_x) * WMMA_N; // num_warp_x = 2
    //int col_base_C = (blockIdx.x * 4 + warp_idx_x) * WMMA_N; // num_warp_x = 4

    //int col_base_C = (blockIdx.x + warp_idx_x) * WMMA_N; // num_warp_x = 2
    

    //int warp_idx_x = threadIdx.x / WARP_SIZE; // This cause time out
    //int warp_idx_y = threadIdx.y;
    //int row_base_C = (blockIdx.y * blockDim.y + threadIdx.y) * WMMA_M;
    //int col_base_C = (blockIdx.x * blockDim.x + threadIdx.x)/ WARP_SIZE * WMMA_N ;

    // if (row_base_C >= M) return;
    if (col_base_C >= N) return;  
    
    auto frag_acc_master = rocwmma::fragment<rocwmma::accumulator, WMMA_M, WMMA_N, WMMA_K, float>();
    rocwmma::fill_fragment(frag_acc_master, 0.f);

    for (int kbase = 0; kbase < K; kbase += K_JUMP) {
        auto frag_acc_block = rocwmma::fragment<rocwmma::accumulator, WMMA_M, WMMA_N, WMMA_K, float>() ;
        rocwmma::fill_fragment(frag_acc_block, 0.f);

        auto frag_a = rocwmma::fragment<rocwmma::matrix_a, WMMA_M, WMMA_N, WMMA_K, __hip_fp8_e4m3_fnuz, rocwmma::col_major>();
        auto frag_b = rocwmma::fragment<rocwmma::matrix_b, WMMA_M, WMMA_N, WMMA_K, __hip_fp8_e4m3_fnuz, rocwmma::row_major>();  

        for (int kmini = 0; kmini < K_JUMP; kmini += WMMA_K) {
            int k_offset = kbase + kmini;            
            rocwmma::load_matrix_sync(frag_a, A_ptr + row_base_C + k_offset * lda, lda);            
            rocwmma::load_matrix_sync(frag_b, B_ptr + k_offset * ldb + col_base_C, ldb);        
            rocwmma::mma_sync(frag_acc_block, frag_a, frag_b, frag_acc_block);
        } // end for kmini

        // Load scaler

        __shared__ float tileScaleA[WMMA_M][WMMA_N + 1]; // col-major tileScaleA[col][row]
        float scaleB = Bs_ptr[(kbase / 128) * sn + (blockIdx.x * ((blockDim.x / WARP_SIZE) * WMMA_N) / 128)]; 

        if (threadIdx.x < WMMA_M) {           
            float val = As_ptr[row_base_C + threadIdx.x + M * (kbase / 128)] * scaleB;
            // Replicate this value across all columns
            for (int j = 0; j < WMMA_N; ++j) {
                tileScaleA[j][threadIdx.x] = val;
            }
        }

        // cg::thread_block this_tb = cg::this_thread_block();
        // auto tile16 = cg::tiled_partition<16>(this_tb); // 128 threads -> 16 x 8
        // int t16x = tile16.thread_rank();
        // int t16y = tile16.meta_group_rank();

        // float val = As_ptr[row_base_C + t16x + M * (kbase / 128)] * scaleB;
        // tileScaleA[t16y][t16x] = val;
        // tileScaleA[t16y + 8][t16x] = val;

        
        // if (t16y == 0){
        //     float val = As_ptr[row_base_C + t16x + M * (kbase / 128)] * scaleB;
        //     for (int j = 0; j < WMMA_N; ++j) {
        //         tileScaleA[j][t16x] = val;
        //     }            
        // }

        __syncthreads();
        
        auto frag_scaleA = rocwmma::fragment<rocwmma::accumulator, WMMA_M, WMMA_N, WMMA_K, float>();
        rocwmma::load_matrix_sync(frag_scaleA, &tileScaleA[0][0], WMMA_N + 1, rocwmma::mem_col_major);

        // TODO: Try to use frag_acc_master as bfloat16, see if it's within error.
        // Apply scaler
        for (int i = 0; i < frag_acc_master.num_elements; ++i) {
            frag_acc_master.x[i] += frag_scaleA.x[i] * frag_acc_block.x[i];
        }
        
    } // end for kbase
   
    // Convert fp32 to bf16 and store
    auto frag_result = rocwmma::fragment<rocwmma::accumulator, WMMA_M, WMMA_N, WMMA_PLACEHOLDER, rocwmma::bfloat16_t>(); //Placeholder frag
    
    for (int i = 0; i < frag_acc_master.num_elements; ++i) {
        frag_result.x[i] = (rocwmma::bfloat16_t)frag_acc_master.x[i];
    }
   
    rocwmma::store_matrix_sync(C_ptr + row_base_C * ldc + col_base_C, frag_result, ldc, rocwmma::mem_row_major);
}

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);

    int num_warp_x = 4;
    int num_warp_y = 1;
    dim3 block_size((WARP_SIZE * num_warp_x), num_warp_y);
    dim3 grid_size((N + num_warp_x * WMMA_N - 1) / (num_warp_x * WMMA_N), 
                   (M + num_warp_y * WMMA_M - 1) / (num_warp_y * WMMA_M));

    custom_kernel<<<grid_size, block_size, 0, 0>>> ((__hip_fp8_e4m3_fnuz*)a.data_ptr(), (__hip_fp8_e4m3_fnuz*)b.data_ptr(), 
    as.data_ptr<float>(), bs.data_ptr<float>(), (rocwmma::bfloat16_t*)c.data_ptr(), M, N, K);
    //C10_CUDA_CHECK(cudaGetLastError());
}
"""

import os
os.environ["CXX"] = "clang++"
import torch
block_shape = 128

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", "-O2"],
)
# O1 is slow, -O2 is equal to nothing,  -O3 is slightly slower than O2 (maybe same)

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

Changes from previous submission

Against this author's previous submission submission 8915.

- # 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>
#include <rocwmma/rocwmma.hpp>
#include <cooperative_groups.h>
namespace cg = cooperative_groups;

using floatx16 = __attribute__((__vector_size__(16 * sizeof(float)))) float;

#define K_JUMP 128
#define WMMA_M 32
#define WMMA_N 32
#define WMMA_K 16
#define WARP_SIZE 64
#define WMMA_PLACEHOLDER 4

__global__ void custom_kernel(const __hip_fp8_e4m3_fnuz* A_ptr, const __hip_fp8_e4m3_fnuz* B_ptr, const float* As_ptr, const float* Bs_ptr, rocwmma::bfloat16_t* C_ptr, int M, int N, int K) {
    /*
    a block covers 32x32x4 elem
    num_warp_x = 4
    num_warp_y = 1
    block size = ((64 * num_warp_x), num_warp_y) = 256 threads
    grid size = (N / (num_warp_x * WMMA_N), M / (num_warp_y * WMMA_M))

    A: M x K col-maj  --- As (1x128 scaling): M x K/128 col-maj
    B: K x N row-maj  --- Bs (128x128 scaling): K/128 x N/128 row-maj
    C: M x N row-maj
    M, N is divisible by 64
    K is divisible by 128
    */      
    int warp_idx = threadIdx.x / WARP_SIZE;
    // int thread_idx = threadIdx.x % WARP_SIZE;
    
    int lda = M;
    int ldb = N;
    int ldc = N;
    
    int sn = (N + 128 - 1) / 128;

    int row_base_C = blockIdx.y * WMMA_M; // row base of warps in a block in C. Divisible by WMM_M
    // int warp_col = (blockIdx.x * blockDim.x / WARP_SIZE + warp_idx) * WMMA_N;
    int col_base_C = blockIdx.x * ((blockDim.x / WARP_SIZE) * WMMA_N) + warp_idx * WMMA_N; // Col base of warps in a block in C. Divisible by WMMA_N

    if (col_base_C > N) return;
    
    auto frag_acc_master = rocwmma::fragment<rocwmma::accumulator, WMMA_M, WMMA_N, WMMA_K, float>();
    rocwmma::fill_fragment(frag_acc_master, 0.f);

    for (int kbase = 0; kbase < K; kbase += K_JUMP) {
        auto frag_acc_block = rocwmma::fragment<rocwmma::accumulator, WMMA_M, WMMA_N, WMMA_K, float>() ;
        rocwmma::fill_fragment(frag_acc_block, 0.f);

        auto frag_a = rocwmma::fragment<rocwmma::matrix_a, WMMA_M, WMMA_N, WMMA_K, __hip_fp8_e4m3_fnuz, rocwmma::col_major>();
        auto frag_b = rocwmma::fragment<rocwmma::matrix_b, WMMA_M, WMMA_N, WMMA_K, __hip_fp8_e4m3_fnuz, rocwmma::row_major>();  

        for (int kmini = 0; kmini < K_JUMP; kmini += WMMA_K) {
            int k_offset = kbase + kmini;            
            rocwmma::load_matrix_sync(frag_a, A_ptr + row_base_C + k_offset * lda, lda);            
            rocwmma::load_matrix_sync(frag_b, B_ptr + k_offset * ldb + col_base_C, ldb);        
            rocwmma::mma_sync(frag_acc_block, frag_a, frag_b, frag_acc_block);
        } // end for kmini

        // Load scaler

        __shared__ float tileScaleA[WMMA_M][WMMA_N + 1]; // col-major tileScaleA[col][row]
        float scaleB = Bs_ptr[(kbase / 128) * sn + (blockIdx.x * ((blockDim.x / WARP_SIZE) * WMMA_N) / 128)]; 

        if (threadIdx.x < WMMA_M) {           
            float val = As_ptr[row_base_C + threadIdx.x + M * (kbase / 128)] * scaleB;
            // Replicate this value across all columns
            for (int j = 0; j < WMMA_N; ++j) {
                tileScaleA[j][threadIdx.x] = val;
            }
        }

        // cg::thread_block this_tb = cg::this_thread_block();
        // auto tile16 = cg::tiled_partition<16>(this_tb); // 128 threads -> 16 x 8
        // int t16x = tile16.thread_rank();
        // int t16y = tile16.meta_group_rank();

        // float val = As_ptr[row_base_C + t16x + M * (kbase / 128)] * scaleB;
        // tileScaleA[t16y][t16x] = val;
        // tileScaleA[t16y + 8][t16x] = val;

        
        // if (t16y == 0){
        //     float val = As_ptr[row_base_C + t16x + M * (kbase / 128)] * scaleB;
        //     for (int j = 0; j < WMMA_N; ++j) {
        //         tileScaleA[j][t16x] = val;
        //     }            
        // }

        __syncthreads();
        
        auto frag_scaleA = rocwmma::fragment<rocwmma::accumulator, WMMA_M, WMMA_N, WMMA_K, float>();
        rocwmma::load_matrix_sync(frag_scaleA, &tileScaleA[0][0], WMMA_N + 1, rocwmma::mem_col_major);

        // TODO: Try to use frag_acc_master as bfloat16, see if it's within error.
        // Apply scaler
        for (int i = 0; i < frag_acc_master.num_elements; ++i) {
            frag_acc_master.x[i] += frag_scaleA.x[i] * frag_acc_block.x[i];
        }
        
    } // end for kbase
   
    // Convert fp32 to bf16 and store
    auto frag_result = rocwmma::fragment<rocwmma::accumulator, WMMA_M, WMMA_N, WMMA_PLACEHOLDER, rocwmma::bfloat16_t>(); //Placeholder frag
    
    for (int i = 0; i < frag_acc_master.num_elements; ++i) {
        frag_result.x[i] = (rocwmma::bfloat16_t)frag_acc_master.x[i];
    }
   
    rocwmma::store_matrix_sync(C_ptr + row_base_C * ldc + col_base_C, frag_result, ldc, rocwmma::mem_row_major);
}

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);

    int num_warp_x = 2;
    int num_warp_y = 1;
    dim3 block_size((WARP_SIZE * num_warp_x), num_warp_y);
    dim3 grid_size((N + num_warp_x * WMMA_N - 1) / (num_warp_x * WMMA_N), 
                   (M + num_warp_y * WMMA_M - 1) / (num_warp_y * WMMA_M));

    custom_kernel<<<grid_size, block_size, 0, 0>>> ((__hip_fp8_e4m3_fnuz*)a.data_ptr(), (__hip_fp8_e4m3_fnuz*)b.data_ptr(), 
    as.data_ptr<float>(), bs.data_ptr<float>(), (rocwmma::bfloat16_t*)c.data_ptr(), M, N, K);
    //C10_CUDA_CHECK(cudaGetLastError());
}
"""

import os
os.environ["CXX"] = "clang++"
import torch
block_shape = 128

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", "-O2"],
)
# O1 is slow, -O2 is equal to nothing,  -O3 is slightly slower than O2 (maybe same)

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

   No newline at end of file
+ # 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>
#include <rocwmma/rocwmma.hpp>
#include <cooperative_groups.h>
namespace cg = cooperative_groups;

using floatx16 = __attribute__((__vector_size__(16 * sizeof(float)))) float;

#define K_JUMP 128
#define WMMA_M 32
#define WMMA_N 32
#define WMMA_K 16
#define WARP_SIZE 64
#define WMMA_PLACEHOLDER 4

__global__ void custom_kernel(const __hip_fp8_e4m3_fnuz* A_ptr, const __hip_fp8_e4m3_fnuz* B_ptr, const float* As_ptr, const float* Bs_ptr, rocwmma::bfloat16_t* C_ptr, int M, int N, int K) {
    /*
    a block covers 32x32x4 elem
    num_warp_x = 4
    num_warp_y = 1
    block size = ((64 * num_warp_x), num_warp_y) = 256 threads
    grid size = (N / (num_warp_x * WMMA_N), M / (num_warp_y * WMMA_M))

    A: M x K col-maj  --- As (1x128 scaling): M x K/128 col-maj
    B: K x N row-maj  --- Bs (128x128 scaling): K/128 x N/128 row-maj
    C: M x N row-maj
    M, N is divisible by 64
    K is divisible by 128
    */      
    int warp_idx_x = threadIdx.x / WARP_SIZE;
    //int warp_idx_y = threadIdx.y;
    
    int lda = M;
    int ldb = N;
    int ldc = N;
    
    int sn = (N + 128 - 1) / 128;

    //int row_base_C = (blockIdx.y * blockDim.y + threadIdx.y) * WMMA_M; // add this line causes the code to be 2x slower
    
    int row_base_C = blockIdx.y * WMMA_M;
    int col_base_C = (blockIdx.x * blockDim.x / WARP_SIZE + warp_idx_x) * WMMA_N;

    //int col_base_C = (blockIdx.x * 2 + warp_idx_x) * WMMA_N; // num_warp_x = 2
    //int col_base_C = (blockIdx.x * 4 + warp_idx_x) * WMMA_N; // num_warp_x = 4

    //int col_base_C = (blockIdx.x + warp_idx_x) * WMMA_N; // num_warp_x = 2
    

    //int warp_idx_x = threadIdx.x / WARP_SIZE; // This cause time out
    //int warp_idx_y = threadIdx.y;
    //int row_base_C = (blockIdx.y * blockDim.y + threadIdx.y) * WMMA_M;
    //int col_base_C = (blockIdx.x * blockDim.x + threadIdx.x)/ WARP_SIZE * WMMA_N ;

    // if (row_base_C >= M) return;
    if (col_base_C >= N) return;  
    
    auto frag_acc_master = rocwmma::fragment<rocwmma::accumulator, WMMA_M, WMMA_N, WMMA_K, float>();
    rocwmma::fill_fragment(frag_acc_master, 0.f);

    for (int kbase = 0; kbase < K; kbase += K_JUMP) {
        auto frag_acc_block = rocwmma::fragment<rocwmma::accumulator, WMMA_M, WMMA_N, WMMA_K, float>() ;
        rocwmma::fill_fragment(frag_acc_block, 0.f);

        auto frag_a = rocwmma::fragment<rocwmma::matrix_a, WMMA_M, WMMA_N, WMMA_K, __hip_fp8_e4m3_fnuz, rocwmma::col_major>();
        auto frag_b = rocwmma::fragment<rocwmma::matrix_b, WMMA_M, WMMA_N, WMMA_K, __hip_fp8_e4m3_fnuz, rocwmma::row_major>();  

        for (int kmini = 0; kmini < K_JUMP; kmini += WMMA_K) {
            int k_offset = kbase + kmini;            
            rocwmma::load_matrix_sync(frag_a, A_ptr + row_base_C + k_offset * lda, lda);            
            rocwmma::load_matrix_sync(frag_b, B_ptr + k_offset * ldb + col_base_C, ldb);        
            rocwmma::mma_sync(frag_acc_block, frag_a, frag_b, frag_acc_block);
        } // end for kmini

        // Load scaler

        __shared__ float tileScaleA[WMMA_M][WMMA_N + 1]; // col-major tileScaleA[col][row]
        float scaleB = Bs_ptr[(kbase / 128) * sn + (blockIdx.x * ((blockDim.x / WARP_SIZE) * WMMA_N) / 128)]; 

        if (threadIdx.x < WMMA_M) {           
            float val = As_ptr[row_base_C + threadIdx.x + M * (kbase / 128)] * scaleB;
            // Replicate this value across all columns
            for (int j = 0; j < WMMA_N; ++j) {
                tileScaleA[j][threadIdx.x] = val;
            }
        }

        // cg::thread_block this_tb = cg::this_thread_block();
        // auto tile16 = cg::tiled_partition<16>(this_tb); // 128 threads -> 16 x 8
        // int t16x = tile16.thread_rank();
        // int t16y = tile16.meta_group_rank();

        // float val = As_ptr[row_base_C + t16x + M * (kbase / 128)] * scaleB;
        // tileScaleA[t16y][t16x] = val;
        // tileScaleA[t16y + 8][t16x] = val;

        
        // if (t16y == 0){
        //     float val = As_ptr[row_base_C + t16x + M * (kbase / 128)] * scaleB;
        //     for (int j = 0; j < WMMA_N; ++j) {
        //         tileScaleA[j][t16x] = val;
        //     }            
        // }

        __syncthreads();
        
        auto frag_scaleA = rocwmma::fragment<rocwmma::accumulator, WMMA_M, WMMA_N, WMMA_K, float>();
        rocwmma::load_matrix_sync(frag_scaleA, &tileScaleA[0][0], WMMA_N + 1, rocwmma::mem_col_major);

        // TODO: Try to use frag_acc_master as bfloat16, see if it's within error.
        // Apply scaler
        for (int i = 0; i < frag_acc_master.num_elements; ++i) {
            frag_acc_master.x[i] += frag_scaleA.x[i] * frag_acc_block.x[i];
        }
        
    } // end for kbase
   
    // Convert fp32 to bf16 and store
    auto frag_result = rocwmma::fragment<rocwmma::accumulator, WMMA_M, WMMA_N, WMMA_PLACEHOLDER, rocwmma::bfloat16_t>(); //Placeholder frag
    
    for (int i = 0; i < frag_acc_master.num_elements; ++i) {
        frag_result.x[i] = (rocwmma::bfloat16_t)frag_acc_master.x[i];
    }
   
    rocwmma::store_matrix_sync(C_ptr + row_base_C * ldc + col_base_C, frag_result, ldc, rocwmma::mem_row_major);
}

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);

    int num_warp_x = 4;
    int num_warp_y = 1;
    dim3 block_size((WARP_SIZE * num_warp_x), num_warp_y);
    dim3 grid_size((N + num_warp_x * WMMA_N - 1) / (num_warp_x * WMMA_N), 
                   (M + num_warp_y * WMMA_M - 1) / (num_warp_y * WMMA_M));

    custom_kernel<<<grid_size, block_size, 0, 0>>> ((__hip_fp8_e4m3_fnuz*)a.data_ptr(), (__hip_fp8_e4m3_fnuz*)b.data_ptr(), 
    as.data_ptr<float>(), bs.data_ptr<float>(), (rocwmma::bfloat16_t*)c.data_ptr(), M, N, K);
    //C10_CUDA_CHECK(cudaGetLastError());
}
"""

import os
os.environ["CXX"] = "clang++"
import torch
block_shape = 128

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", "-O2"],
)
# O1 is slow, -O2 is equal to nothing,  -O3 is slightly slower than O2 (maybe same)

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

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