youmuliu/stgsharp
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Gemm/Fma kernel on avx512 use new solution, with less permute and shuff instruction

Browse Source
This commit is contained in:
Youmu Liu
2026-06-04 16:43:17 +08:00
parent 6c38bcfade
commit 2690cf9341
3 changed files with 44 additions and 46 deletions
Download Patch File Download Diff File Expand all files Collapse all files
StgSharp.Native/sn-src/mk.fma.x86.c
+24 -28
View File
@@ -142,39 +142,35 @@ SN_MK_PROC_DECL_STD(float, 512, , fma)
{
__mk_param_std(TILE, LEFT_RIGHT_ANS, float);
SN_MAT_KERNEL_LOCAL *restrict ans_cur = ans + GET_INDEX(common_y, x, y);
register __m512 c_0 = _mm512_load_ps((float *)ans_cur);
register __m512 c_1 = c_0;
register __m512 c_2 = c_0;
register __m512 c_3 = c_0;
register __m512 c0 = _mm512_setzero_ps();
register __m512 c1 = _mm512_setzero_ps();
register __m512 c2 = _mm512_setzero_ps();
register __m512 c3 = _mm512_setzero_ps();
for (size_t z = 0; z < common_z; z+=4) {
SN_MAT_KERNEL_LOCAL const *right_ = right + z;
SN_MAT_KERNEL_LOCAL const *left_0 = left + z + 0;
SN_MAT_KERNEL_LOCAL const *left_1 = left + z + 1;
SN_MAT_KERNEL_LOCAL const *left_2 = left + z + 2;
SN_MAT_KERNEL_LOCAL const *left_3 = left + z + 3;
const SN_MAT_KERNEL_LOCAL *a_base = left + z;
const SN_MAT_KERNEL_LOCAL *b_base = right + z;
// full right load：[kb_col0 | kb_col1 | kb_col2 | kb_col3]
register __m512 b_0 = _mm512_load_ps((float *)(right+0));
register __m512 b_1 = _mm512_load_ps((float *)(right+1));
register __m512 b_2 = _mm512_load_ps((float *)(right+2));
register __m512 b_3 = _mm512_load_ps((float *)(right+3));
register __m512 b0 = _mm512_load_ps((float *)&b_base[0].z[0]);
register __m512 b1 = _mm512_load_ps((float *)&b_base[1].z[0]);
register __m512 b2 = _mm512_load_ps((float *)&b_base[2].z[0]);
register __m512 b3 = _mm512_load_ps((float *)&b_base[3].z[0]);
register __m512 a0 = _mm512_load_ps((float *)&a_base[0].z[0]);
register __m512 a1 = _mm512_load_ps((float *)&a_base[1].z[0]);
register __m512 a2 = _mm512_load_ps((float *)&a_base[2].z[0]);
register __m512 a3 = _mm512_load_ps((float *)&a_base[3].z[0]);
SN_MK_FMA_F32_512_CYCLE(0);
SN_MK_FMA_F32_512_CYCLE(1);
SN_MK_FMA_F32_512_CYCLE(2);
SN_MK_FMA_F32_512_CYCLE(3);
// k=0: broadcast ka_col0 到4个lane，permute_ps 取 kb(0,j)
register __m512 ak;
register __m512 ak_1;
register __m512 ak_2;
register __m512 ak_3;
SN_MK_FMA_F32_512_PHASE(0);
SN_MK_FMA_F32_512_PHASE(1);
SN_MK_FMA_F32_512_PHASE(2);
SN_MK_FMA_F32_512_PHASE(3);
}
c_0 = _mm512_add_ps(c_0, c_1);
c_2= _mm512_add_ps(c_2, c_3);
c_0 = _mm512_add_ps(c_0, c_2);
_mm512_store_ps((float *)ans_cur, c_0);
SN_FMA_PACK_COLUMN(c0, (float*)&(ans_cur->x[0]));
SN_FMA_PACK_COLUMN(c1, (float*)&(ans_cur->x[1]));
SN_FMA_PACK_COLUMN(c2, (float*)&(ans_cur->x[2]));
SN_FMA_PACK_COLUMN(c3, (float*)&(ans_cur->x[3]));
}