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_mi_memcpy/_mi_memzero: tighten criteria for intrinsics for windows.

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FSRM is better used for buffer <= 128 bytes and ERMS, if supported for larger
chunks.
This commit is contained in:
David Carlier 2024-11-16 09:38:26 +00:00
parent 54940a6a65
commit 9f0a7ac0be
WARNING! Although there is a key with this ID in the database it does not verify this commit! This commit is SUSPICIOUS.
GPG key ID: 8486F847B4B94EF1
2 changed files with 7 additions and 3 deletions
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5
include/mimalloc/internal.h
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@ -911,8 +911,9 @@ static inline size_t mi_bsr(uintptr_t x) {
#if !MI_TRACK_ENABLED && defined(_WIN32) && (defined(_M_IX86) || defined(_M_X64))
#include <intrin.h>
extern bool _mi_cpu_has_fsrm;
extern bool _mi_cpu_has_erms;
static inline void _mi_memcpy(void* dst, const void* src, size_t n) {
if (_mi_cpu_has_fsrm) {
if ((_mi_cpu_has_fsrm && n <= 128) || (_mi_cpu_has_erms && n > 128)) {
__movsb((unsigned char*)dst, (const unsigned char*)src, n);
}
else {
@ -920,7 +921,7 @@ static inline void _mi_memcpy(void* dst, const void* src, size_t n) {
}
}
static inline void _mi_memzero(void* dst, size_t n) {
if (_mi_cpu_has_fsrm) {
if ((_mi_cpu_has_fsrm && n <= 128) || (_mi_cpu_has_erms && n > 128)) {
__stosb((unsigned char*)dst, 0, n);
}
else {