Disable AVX512 IFMA usage on Windows

aws · Sep 25, 2024 · 0449e0c · 0449e0c
1 parent 454a298
commit 0449e0c
Showing 1 changed file with 4 additions and 0 deletions.
diff --git 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) {