From aab9e38894b1864a0ed541c6b4d5ae30a0589f36 Mon Sep 17 00:00:00 2001
From: Mounir IDRASSI <mounir.idrassi@amcrypto.jp>
Date: Wed, 3 Jun 2026 15:10:13 +0900
Subject: [PATCH] Fix x64 CPU feature macro guard

CRYPTOPP_BOOL_X64 is defined as 0 on non-x64 builds, so #ifdef made HasSSE2() and HasISSE() always true. Use #if so non-x64 builds follow runtime feature detection and DisableCPUExtendedFeatures().
---
 src/Crypto/cpu.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Crypto/cpu.h b/src/Crypto/cpu.h
index 507ef184..b8e02b3e 100644
--- a/src/Crypto/cpu.h
+++ b/src/Crypto/cpu.h
@@ -266,7 +266,7 @@ int CpuId(uint32 input, uint32 output[4]);
 // been enabled by DetectX86Features.
 void DisableCPUExtendedFeatures (); 
 
-#ifdef CRYPTOPP_BOOL_X64
+#if CRYPTOPP_BOOL_X64
 #define HasSSE2()	1
 #define HasISSE()	1
 #else