From 0449e0c6d50aa3802e755b326e5220a7bde20fb9 Mon Sep 17 00:00:00 2001
From: Justin Smith <justsmth@amazon.com>
Date: Wed, 25 Sep 2024 12:40:14 -0400
Subject: [PATCH] Disable AVX512 IFMA usage on Windows

---
 crypto/fipsmodule/cpucap/internal.h | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/crypto/fipsmodule/cpucap/internal.h b/crypto/fipsmodule/cpucap/internal.h
index 12e93ebcf8..bb7bce4d3f 100644
--- a/crypto/fipsmodule/cpucap/internal.h
+++ b/crypto/fipsmodule/cpucap/internal.h
@@ -140,8 +140,12 @@ OPENSSL_INLINE int CRYPTO_is_VPCLMULQDQ_capable(void) {
 // 1100_0000_0010_0011_0000_0000_0000_0000
 #define CPU_CAP_AVX512IFMA_BITFLAGS 0xC0230000
 OPENSSL_INLINE int CRYPTO_is_AVX512IFMA_capable(void) {
+#if defined(OPENSSL_WINDOWS)
+  return 0;
+#else
   return (OPENSSL_ia32cap_get()[2] & CPU_CAP_AVX512IFMA_BITFLAGS) ==
          CPU_CAP_AVX512IFMA_BITFLAGS;
+#endif
 }
 
 OPENSSL_INLINE int CRYPTO_is_VBMI2_capable(void) {