From 7c81d43b10f3e594f512c9d6272da3e73f4cbead Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pa=CC=84vels=20Nadtoc=CC=8Cajevs?=
 <7645683+bruvzg@users.noreply.github.com>
Date: Thu, 31 Jul 2025 19:52:42 +0300
Subject: [PATCH] [Windows] Additionally use `cpuid` instruction to detect
 SSE4.2 support.

---
 platform/windows/cpu_feature_validation.c | 28 ++++++++++++++++++++++-
 1 file changed, 27 insertions(+), 1 deletion(-)

diff --git a/platform/windows/cpu_feature_validation.c b/platform/windows/cpu_feature_validation.c
index 221b1a371a6..99f7f3f32b5 100644
--- a/platform/windows/cpu_feature_validation.c
+++ b/platform/windows/cpu_feature_validation.c
@@ -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