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[Windows] Additionally use cpuid instruction to detect SSE4.2 support.

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This commit is contained in:
Pāvels Nadtočajevs
2025-07-31 19:52:42 +03:00
parent 45509c284c
commit 7c81d43b10
1 changed files with 27 additions and 1 deletions
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28
platform/windows/cpu_feature_validation.c
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@@ -29,6 +29,23 @@
/**************************************************************************/
#include <windows.h>
#ifdef _MSC_VER
#include <intrin.h> // For builtin __cpuid.
#else
void __cpuid(int *r_cpuinfo, int p_info) {
// Note: Some compilers have a buggy `__cpuid` intrinsic, using inline assembly (based on LLVM-20 implementation) instead.
__asm__ __volatile__(
"xchgq %%rbx, %q1;"
"cpuid;"
"xchgq %%rbx, %q1;"
: "=a"(r_cpuinfo[0]), "=r"(r_cpuinfo[1]), "=c"(r_cpuinfo[2]), "=d"(r_cpuinfo[3])
: "0"(p_info));
}
#endif
#ifndef PF_SSE4_2_INSTRUCTIONS_AVAILABLE
#define PF_SSE4_2_INSTRUCTIONS_AVAILABLE 38
#endif
#ifdef WINDOWS_SUBSYSTEM_CONSOLE
extern int WINAPI mainCRTStartup();
@@ -41,7 +58,16 @@ extern int WINAPI ShimMainCRTStartup() __attribute__((used));
#endif
extern int WINAPI ShimMainCRTStartup() {
if (IsProcessorFeaturePresent(PF_SSE4_2_INSTRUCTIONS_AVAILABLE)) {
BOOL win_sse42_supported = FALSE;
BOOL cpuid_sse42_supported = FALSE;
int cpuinfo[4];
__cpuid(cpuinfo, 0x01);
win_sse42_supported = IsProcessorFeaturePresent(PF_SSE4_2_INSTRUCTIONS_AVAILABLE);
cpuid_sse42_supported = cpuinfo[2] & (1 << 20);
if (win_sse42_supported || cpuid_sse42_supported) {
#ifdef WINDOWS_SUBSYSTEM_CONSOLE
return mainCRTStartup();
#else