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Add fast path for small xSYR with INCX==1

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Martin Kroeker 2021-05-22 20:41:18 +02:00 committed by GitHub
parent 02087a62e7
commit 03297ff9f0
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1 changed files with 21 additions and 0 deletions
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interface/syr.c
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@ -168,7 +168,28 @@ void CNAME(enum CBLAS_ORDER order, enum CBLAS_UPLO Uplo, blasint n, FLOAT alpha,
IDEBUG_START;
FUNCTION_PROFILE_START();
#if 1
if (incx == 1 && n < 100) {
BLASLONG i;
if (uplo == 0) {
for (i = 0; i < n; i++){
if (x[i] != ZERO) {
AXPYU_K(i + 1, 0, 0, alpha * x[i], x, 1, a, 1, NULL, 0);
}
a += lda;
}
} else {
for (i = 0; i < n; i++){
if (x[i] != ZERO) {
AXPYU_K(n - i, 0, 0, alpha * x[i], x + i, 1, a, 1, NULL, 0);
}
a += 1 + lda;
}
}
return;
}
#endif
if (incx < 0 ) x -= (n - 1) * incx;
buffer = (FLOAT *)blas_memory_alloc(1);