Function mi_detect_cpu_features

3rd/mimalloc-2.0.9/src/init.c:567–572

mi_decl_cache_align bool _mi_cpu_has_fsrm = false;

static void mi_detect_cpu_features(void) {
  // FSRM for fast rep movsb support (AMD Zen3+ (~2020) or Intel Ice Lake+ (~2017))
  int32_t cpu_info[4];
  __cpuid(cpu_info, 7);
  _mi_cpu_has_fsrm = ((cpu_info[3] & (1 << 4)) != 0); // bit 4 of EDX : see <https ://en.wikipedia.org/wiki/CPUID#EAX=7,_ECX=0:_Extended_Features>
}
#else
static void mi_detect_cpu_features(void) {
  // nothing