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perf: use stmatrix in epilogue for sm90+ #380

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merged 2 commits into from
Jul 19, 2024
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perf: use stmatrix in epilogue for sm90+ #380

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yzh119 Jul 19, 2024
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yzh119 Jul 19, 2024
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6 changes: 6 additions & 0 deletions include/flashinfer/attention/prefill.cuh
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Original file line number Diff line number Diff line change
Expand Up @@ -893,6 +893,11 @@ __device__ __forceinline__ void write_o_reg_gmem(
for (uint32_t fy = 0; fy < num_frags_y; ++fy) {
uint32_t o_frag_f16[4];
vec_cast<DTypeOut, float, 8>((DTypeOut*)o_frag_f16, o_frag[fx][fy]);
#ifdef FLASHINFER_STMATRIX_M8N8X4_ENABLED
uint32_t o_smem_offset_w = smem_t::get_permuted_offset<channel_size_128b_out>(
(warp_idx_x * num_frags_x + fx) * 16 + lane_idx % 16, fy * 2 + lane_idx / 16);
o_smem->stmatrix_m8n8x4(o_smem_offset_w, o_frag_f16);
#else
uint32_t o_smem_offset_w = smem_t::get_permuted_offset<channel_size_128b_out>(
(warp_idx_x * num_frags_x + fx) * 16 + lane_idx / 4, fy * 2);
((uint32_t*)(o_smem->base + o_smem_offset_w))[lane_idx % 4] = o_frag_f16[0];
Expand All @@ -901,6 +906,7 @@ __device__ __forceinline__ void write_o_reg_gmem(
((uint32_t*)(o_smem->base + (o_smem_offset_w ^ 0x1)))[lane_idx % 4] = o_frag_f16[2];
((uint32_t*)(o_smem->base + (o_smem_offset_w ^ 0x1) +
8 * channel_size_128b_out))[lane_idx % 4] = o_frag_f16[3];
#endif
}
}

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