static bool os_supports_avx_vectors() {
bool retVal = false;
if (supports_evex()) {
// Verify that OS save/restore all bits of EVEX registers
// during signal processing.
int nreg = 2 LP64_ONLY(+2);
retVal = true;
for (int i = 0; i < 16 * nreg; i++) { // 64 bytes per zmm register
if (_cpuid_info.zmm_save[i] != ymm_test_value()) {
retVal = false;
break;
}
}
} else if (supports_avx()) {
// Verify that OS save/restore all bits of AVX registers
// during signal processing.
int nreg = 2 LP64_ONLY(+2);
retVal = true;
for (int i = 0; i < 8 * nreg; i++) { // 32 bytes per ymm register
if (_cpuid_info.ymm_save[i] != ymm_test_value()) {
retVal = false;
break;
}
}
}
return retVal;
}
static bool os_supports_avx_vectors() {
if (!supports_avx()) {
return false;
}
// Verify that OS save/restore all bits of AVX registers
// during signal processing.
int nreg = 2 LP64_ONLY(+2);
for (int i = 0; i < 8 * nreg; i++) { // 32 bytes per ymm register
if (_cpuid_info.ymm_save[i] != ymm_test_value()) {
return false;
}
}
return true;
}