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Use the skylake sgemm beta code also for haswell 

with a few small changes it's possible to use the skylake sgemm code
also for haswell, this gives a modest gain (10% range) for smallish
matrixes but does wonders for very skinny matrixes
This commit is contained in:
Arjan van de Ven 2018-12-15 13:18:59 +00:00
parent 78d877b54b
commit 00dc09ad19
2 changed files with 12 additions and 4 deletions
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1
kernel/x86_64/KERNEL.HASWELL
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@ -33,6 +33,7 @@ ZAXPYKERNEL = zaxpy.c
STRMMKERNEL = sgemm_kernel_16x4_haswell.S
SGEMMKERNEL = sgemm_kernel_16x4_haswell.S
SGEMM_BETA = sgemm_beta_skylakex.c
SGEMMINCOPY = ../generic/gemm_ncopy_16.c
SGEMMITCOPY = ../generic/gemm_tcopy_16.c
SGEMMONCOPY = ../generic/gemm_ncopy_4.c

15
kernel/x86_64/sgemm_beta_skylakex.c
View File

@ -61,11 +61,11 @@ int CNAME(BLASLONG m, BLASLONG n, BLASLONG dummy1, FLOAT beta,
c_offset = c;
if (beta == ZERO){
__m512 z_zero;
__m256 y_zero;
#ifdef __AVX512CD__
__m512 z_zero = _mm512_setzero_ps();
#endif
__m256 y_zero = _mm256_setzero_ps();
z_zero = _mm512_setzero_ps();
y_zero = _mm256_setzero_ps();
j = n;
do {
c_offset1 = c_offset;
@ -74,8 +74,15 @@ int CNAME(BLASLONG m, BLASLONG n, BLASLONG dummy1, FLOAT beta,
i = m;
while (i >= 32) {
#ifdef __AVX512CD__
_mm512_storeu_ps(c_offset1, z_zero);
_mm512_storeu_ps(c_offset1 + 16, z_zero);
#else
_mm256_storeu_ps(c_offset1, y_zero);
_mm256_storeu_ps(c_offset1 + 8, y_zero);
_mm256_storeu_ps(c_offset1 + 16, y_zero);
_mm256_storeu_ps(c_offset1 + 24, y_zero);
#endif
c_offset1 += 32;
i -= 32;
}