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https://github.com/ml-explore/mlx.git
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Experimenting with a gemm based on the cuda steel utils
This commit is contained in:
@@ -24,6 +24,7 @@ target_sources(
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${CMAKE_CURRENT_SOURCE_DIR}/fence.cpp
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${CMAKE_CURRENT_SOURCE_DIR}/gemms/gemv.cu
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${CMAKE_CURRENT_SOURCE_DIR}/gemms/cublas_gemm.cpp
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${CMAKE_CURRENT_SOURCE_DIR}/gemms/steel_gemm.cu
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${CMAKE_CURRENT_SOURCE_DIR}/jit_module.cpp
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${CMAKE_CURRENT_SOURCE_DIR}/indexing.cpp
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${CMAKE_CURRENT_SOURCE_DIR}/kernel_utils.cu
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301
mlx/backend/cuda/gemms/steel_gemm.cu
Normal file
301
mlx/backend/cuda/gemms/steel_gemm.cu
Normal file
@@ -0,0 +1,301 @@
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#include "mlx/backend/common/matmul.h"
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#include "mlx/backend/cuda/device.h"
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#include "mlx/backend/cuda/device/utils.cuh"
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#include "mlx/backend/cuda/gemms/steel_gemm.h"
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#include "mlx/backend/cuda/kernel_utils.cuh"
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#include "mlx/primitives.h"
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#include <nvtx3/nvtx3.hpp>
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#include <numeric>
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#include <cooperative_groups.h>
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#include "mlx/backend/cuda/steel/gemm.cuh"
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#include "mlx/backend/cuda/steel/mma.cuh"
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#include "mlx/backend/cuda/steel/tiles.cuh"
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namespace mlx::core {
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namespace cu {
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namespace cg = cooperative_groups;
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struct GemmParams {
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int M;
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int N;
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int K;
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int lda;
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int ldb;
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int ldd;
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int NblockM;
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int NblockN;
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int NblockK;
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};
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template <
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typename T,
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int BM,
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int BN,
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int BK,
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int WM,
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int WN,
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bool transpose_a,
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bool transpose_b,
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int SL,
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int Nstages>
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__global__ void kernel_steel_gemm(
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const T* a,
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const T* b,
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T* d,
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__grid_constant__ const GemmParams params) {
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const int bM_idx = (blockIdx.y << SL) + (blockIdx.x & ((1 << SL) - 1));
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const int bN_idx = blockIdx.x >> SL;
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if (params.NblockN <= bN_idx || params.NblockM <= bM_idx) {
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return;
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}
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const int d_row = bM_idx * BM;
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const int d_col = bN_idx * BN;
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const size_t d_row_long = size_t(d_row);
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const size_t d_col_long = size_t(d_col);
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a += transpose_a ? d_row_long : d_row_long * params.K;
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b += transpose_b ? d_col_long * params.K : d_col_long;
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d += d_row_long * params.ldd + d_col_long;
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auto block = cg::this_thread_block();
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auto warp = cg::tiled_partition<32>(block);
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const int lane_idx = warp.thread_rank();
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const int warp_idx = warp.meta_group_rank();
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const int wm = warp_idx / WN;
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const int wn = warp_idx % WN;
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constexpr int SM = BM / WM;
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constexpr int SN = BN / WN;
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constexpr int SK = BK;
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constexpr int TK = SK / 16;
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constexpr int NUM_WARPS = WM * WN;
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// Allocate shared memory
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extern __shared__ char shmem[];
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SharedTile<T, BM, BK>(&as)[Nstages] =
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*(SharedTile<T, BM, BK>(*)[Nstages])(&shmem[0]);
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SharedTile<T, BN, BK>(&bs)[Nstages] = *(SharedTile<T, BN, BK>(*)[Nstages])(
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&shmem[sizeof(T) * Nstages * BM * BK]);
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// Allocate registers for the MMA
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RegisterTile<float, SM, SN> C;
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RegisterTile<T, SM, 16> A[TK];
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RegisterTile<T, SN, 16> B[TK];
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// Zero the accumulators
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C.fill(0);
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// Start gmem -> smem copies
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int k_block_read = 0;
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MLX_UNROLL
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for (int bk = 0; bk < (Nstages - 1); bk++) {
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load_async<NUM_WARPS>(
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as[bk], as[bk].base_addr(), a + k_block_read, params.K);
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load_async<NUM_WARPS>(
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bs[bk], bs[bk].base_addr(), b + k_block_read, params.K);
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k_block_read += BK;
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cp_async_commit();
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}
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int smem_pipe_read = 0;
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int smem_pipe_write = Nstages - 1;
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// Wait till only 1 remains laoding
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cp_async_wait<1>();
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block.sync();
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const int offset_m = wm * SM;
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const int offset_n = wn * SN;
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// Start smem -> register copy
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A[0].load(
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as[smem_pipe_read],
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as[smem_pipe_read].base_addr(),
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offset_m + lane_idx % 16,
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lane_idx / 16 * 8);
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B[0].load(
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bs[smem_pipe_read],
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bs[smem_pipe_read].base_addr(),
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offset_n + lane_idx % 16,
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lane_idx / 16 * 8);
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// Main loop
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for (int kb = 0; kb < params.NblockK; kb++) {
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// Prepare next registers
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{
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A[1].load(
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as[smem_pipe_read],
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as[smem_pipe_read].base_addr(),
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offset_m + lane_idx % 16,
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16 + lane_idx / 16 * 8);
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B[1].load(
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bs[smem_pipe_read],
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bs[smem_pipe_read].base_addr(),
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offset_n + lane_idx % 16,
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16 + lane_idx / 16 * 8);
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}
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// Prepare next smem
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if ((kb + Nstages - 1) < params.NblockK) {
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load_async<NUM_WARPS>(
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as[smem_pipe_write],
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as[smem_pipe_write].base_addr(),
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a + k_block_read,
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params.K);
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load_async<NUM_WARPS>(
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bs[smem_pipe_write],
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bs[smem_pipe_write].base_addr(),
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b + k_block_read,
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params.K);
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}
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k_block_read += BK;
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cp_async_commit();
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smem_pipe_write = smem_pipe_read;
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smem_pipe_read = smem_pipe_read + 1;
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smem_pipe_read = (smem_pipe_read == Nstages) ? 0 : smem_pipe_read;
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// Do current gemm
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mma_t(C, A[0], B[0]);
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// Do wait for next register
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cp_async_wait<1>();
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block.sync();
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// Prepare next register (smem_pipe_read has moved to the next)
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{
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A[0].load(
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as[smem_pipe_read],
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as[smem_pipe_read].base_addr(),
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offset_m + lane_idx % 16,
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lane_idx / 16 * 8);
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B[0].load(
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bs[smem_pipe_read],
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bs[smem_pipe_read].base_addr(),
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offset_n + lane_idx % 16,
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lane_idx / 16 * 8);
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}
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// Do current gemm
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mma_t(C, A[1], B[1]);
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}
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// Wait and clear
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cp_async_wait_all();
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block.sync();
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C.store_global(d, params.ldd, offset_m, offset_n);
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}
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} // namespace cu
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void dispatch_steel_gemm(
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const Stream& s,
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cu::CommandEncoder& encoder,
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const array& a,
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const array& b,
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array& d,
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int M,
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int N,
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int K,
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int lda,
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int ldb,
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int ldd,
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bool a_transposed,
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bool b_transposed) {
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using DataType = cuda_type_t<float16_t>;
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encoder.set_input_array(a);
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encoder.set_input_array(b);
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encoder.set_output_array(d);
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constexpr int BM = 128;
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constexpr int BN = 128;
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constexpr int BK = 32;
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constexpr int WM = 2;
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constexpr int WN = 2;
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constexpr int SL = 0;
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constexpr int Nstages = 3;
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constexpr uint32_t smem_bytes = BK * (BM + BN) * Nstages * sizeof(DataType);
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const int NblockM = (M + BM - 1) / BM;
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const int NblockN = (N + BN - 1) / BN;
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const int NblockK = (K + BK - 1) / BK;
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cu::GemmParams params{
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/* int M = */ M,
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/* int N = */ N,
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/* int K = */ K,
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/* int lda = */ lda,
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/* int ldb = */ ldb,
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/* int ldd = */ ldd,
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/* int NblockM = */ NblockM,
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/* int NblockN = */ NblockN,
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/* int NblockK = */ NblockK,
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};
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// Prepare launch grid params
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int tile = 1 << SL;
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int tm = (NblockM + tile - 1) / tile;
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int tn = NblockN * tile;
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dim3 grid_dim(tn, tm, 1);
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dim3 block_dim(32 * WM * WN, 1, 1);
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dispatch_bool(a_transposed, [&](auto ta_) {
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dispatch_bool(b_transposed, [&](auto tb_) {
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constexpr bool ta = ta_.value;
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constexpr bool tb = tb_.value;
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auto kernel = cu::ab_t_aligned<DataType, BM, BN, BK>;
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cudaFuncSetAttribute(
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kernel, cudaFuncAttributeMaxDynamicSharedMemorySize, smem_bytes);
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encoder.add_kernel_node(
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kernel,
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grid_dim,
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block_dim,
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smem_bytes,
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a.data<DataType>(),
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b.data<DataType>(),
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d.data<DataType>(),
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N,
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K);
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// auto kernel = cu::kernel_steel_gemm<DataType, BM, BN, BK, WM, WN, ta,
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// tb, SL, Nstages>;
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// cudaFuncSetAttribute(kernel,
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// cudaFuncAttributeMaxDynamicSharedMemorySize, smem_bytes);
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// encoder.add_kernel_node(
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// kernel,
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// grid_dim,
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// block_dim,
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// smem_bytes,
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// a.data<DataType>(),
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// b.data<DataType>(),
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// d.data<DataType>(),
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// params);
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});
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});
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}
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} // namespace mlx::core
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27
mlx/backend/cuda/gemms/steel_gemm.h
Normal file
27
mlx/backend/cuda/gemms/steel_gemm.h
Normal file
@@ -0,0 +1,27 @@
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#pragma once
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#include "mlx/backend/common/matmul.h"
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#include "mlx/backend/cuda/device.h"
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#include "mlx/primitives.h"
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#include <nvtx3/nvtx3.hpp>
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#include <numeric>
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namespace mlx::core {
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void dispatch_steel_gemm(
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const Stream& s,
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cu::CommandEncoder& encoder,
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const array& a,
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const array& b,
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array& d,
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int M,
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int N,
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int K,
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int lda,
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int ldb,
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int ldd,
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bool a_transposed,
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bool b_transposed);
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} // namespace mlx::core
|
@@ -7,6 +7,8 @@
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#include "mlx/backend/gpu/copy.h"
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#include "mlx/primitives.h"
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#include "mlx/backend/cuda/gemms/steel_gemm.h"
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#include <nvtx3/nvtx3.hpp>
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#include <numeric>
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@@ -95,6 +97,24 @@ void Matmul::eval_gpu(const std::vector<array>& inputs, array& out) {
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return;
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}
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if (out.dtype() == float16 && batch_count == 1 && !a_transposed &&
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b_transposed) {
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return dispatch_steel_gemm(
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/* const Stream& s = */ s,
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/* cu::CommandEncoder& encoder = */ encoder,
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/* const array& a = */ a,
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/* const array& b = */ b,
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/* array& d = */ out,
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/* int M = */ M,
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/* int N = */ N,
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/* int K = */ K,
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/* int lda = */ lda,
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/* int ldb = */ ldb,
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/* int ldd = */ N,
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/* bool a_transposed = */ a_transposed,
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/* bool b_transposed = */ b_transposed);
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}
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/////////////////////////////////////////////////////////////////////////////
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// Invoke cublasLt
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CublasGemm gemm(
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|
@@ -143,85 +143,87 @@ struct Tile16x16 {
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}
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};
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/**
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* A simple container of multiple Tile16x16.
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*
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* Provides utility functions for loading and manipulating collections of basic
|
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* tiles.
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*/
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template <typename T, int ROWS_, int COLS_>
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struct RegisterTile {
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static constexpr int ROWS = ROWS_;
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static constexpr int COLS = COLS_;
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static constexpr int TILES_X = COLS / 16;
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static constexpr int TILES_Y = ROWS / 16;
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// /**
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// * A simple container of multiple Tile16x16.
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// *
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// * Provides utility functions for loading and manipulating collections of
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// basic
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// * tiles.
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// */
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// template <typename T, int ROWS_, int COLS_>
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// struct RegisterTile {
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// static constexpr int ROWS = ROWS_;
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// static constexpr int COLS = COLS_;
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// static constexpr int TILES_X = COLS / 16;
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// static constexpr int TILES_Y = ROWS / 16;
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Tile16x16<T> data[TILES_X * TILES_Y];
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// Tile16x16<T> data[TILES_X * TILES_Y];
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__device__ inline void fill(T v) {
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MLX_UNROLL
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for (int i = 0; i < TILES_Y; i++) {
|
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MLX_UNROLL
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for (int j = 0; j < TILES_X; j++) {
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data[i * TILES_X + j].fill(v);
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}
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}
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}
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// __device__ inline void fill(T v) {
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// MLX_UNROLL
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// for (int i = 0; i < TILES_Y; i++) {
|
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// MLX_UNROLL
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// for (int j = 0; j < TILES_X; j++) {
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// data[i * TILES_X + j].fill(v);
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// }
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||||
// }
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// }
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template <typename Tile>
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__device__ __forceinline__ void
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load(Tile& tile, uint32_t base_address, int row, int col) {
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MLX_UNROLL
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for (int i = 0; i < TILES_Y; i++) {
|
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MLX_UNROLL
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for (int j = 0; j < TILES_X; j++) {
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data[i * TILES_X + j].load(
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tile.loc(base_address, row + i * 16, col + j * 16));
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}
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}
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||||
}
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// template <typename Tile>
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// __device__ __forceinline__ void
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// load(Tile& tile, uint32_t base_address, int row, int col) {
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// MLX_UNROLL
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||||
// for (int i = 0; i < TILES_Y; i++) {
|
||||
// MLX_UNROLL
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// for (int j = 0; j < TILES_X; j++) {
|
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// data[i * TILES_X + j].load(
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// tile.loc(base_address, row + i * 16, col + j * 16));
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// }
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||||
// }
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||||
// }
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||||
|
||||
template <typename Tile, typename F>
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||||
__device__ __forceinline__ void
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||||
load(Tile& tile, F f, uint32_t base_address, int row, int col) {
|
||||
MLX_UNROLL
|
||||
for (int i = 0; i < TILES_Y; i++) {
|
||||
MLX_UNROLL
|
||||
for (int j = 0; j < TILES_X; j++) {
|
||||
f(data[i * TILES_X + j],
|
||||
tile,
|
||||
base_address,
|
||||
row + i * 16,
|
||||
col + j * 16);
|
||||
}
|
||||
}
|
||||
}
|
||||
// template <typename Tile, typename F>
|
||||
// __device__ __forceinline__ void
|
||||
// load(Tile& tile, F f, uint32_t base_address, int row, int col) {
|
||||
// MLX_UNROLL
|
||||
// for (int i = 0; i < TILES_Y; i++) {
|
||||
// MLX_UNROLL
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||||
// for (int j = 0; j < TILES_X; j++) {
|
||||
// f(data[i * TILES_X + j],
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||||
// tile,
|
||||
// base_address,
|
||||
// row + i * 16,
|
||||
// col + j * 16);
|
||||
// }
|
||||
// }
|
||||
// }
|
||||
|
||||
template <typename U>
|
||||
__device__ inline void store_global(U* x, int N, int row, int col) {
|
||||
MLX_UNROLL
|
||||
for (int i = 0; i < TILES_Y; i++) {
|
||||
MLX_UNROLL
|
||||
for (int j = 0; j < TILES_X; j++) {
|
||||
data[i * TILES_X + j].store_global(
|
||||
x + (row + i * 16) * N + col + j * 16, N);
|
||||
}
|
||||
}
|
||||
}
|
||||
// template <typename U>
|
||||
// __device__ inline void store_global(U* x, int N, int row, int col) {
|
||||
// MLX_UNROLL
|
||||
// for (int i = 0; i < TILES_Y; i++) {
|
||||
// MLX_UNROLL
|
||||
// for (int j = 0; j < TILES_X; j++) {
|
||||
// data[i * TILES_X + j].store_global(
|
||||
// x + (row + i * 16) * N + col + j * 16, N);
|
||||
// }
|
||||
// }
|
||||
// }
|
||||
|
||||
template <typename U>
|
||||
__device__ inline void
|
||||
store_global_safe(U* x, int N, int row, int col, int max_rows) {
|
||||
MLX_UNROLL
|
||||
for (int i = 0; i < TILES_Y; i++) {
|
||||
MLX_UNROLL
|
||||
for (int j = 0; j < TILES_X; j++) {
|
||||
data[i * TILES_X + j].store_global_safe(
|
||||
x + (row + i * 16) * N + col + j * 16, N, max_rows - row - i * 16);
|
||||
}
|
||||
}
|
||||
}
|
||||
};
|
||||
// template <typename U>
|
||||
// __device__ inline void
|
||||
// store_global_safe(U* x, int N, int row, int col, int max_rows) {
|
||||
// MLX_UNROLL
|
||||
// for (int i = 0; i < TILES_Y; i++) {
|
||||
// MLX_UNROLL
|
||||
// for (int j = 0; j < TILES_X; j++) {
|
||||
// data[i * TILES_X + j].store_global_safe(
|
||||
// x + (row + i * 16) * N + col + j * 16, N, max_rows - row - i *
|
||||
// 16);
|
||||
// }
|
||||
// }
|
||||
// }
|
||||
// };
|
||||
|
||||
/**
|
||||
* A simple container of multiple Tile16x16.
|
||||
|
Reference in New Issue
Block a user