From 6b8d872e5e2dd68a5229ec55f5261dae34ff9bdb Mon Sep 17 00:00:00 2001
From: Pieter Wuille <pieter.wuille@gmail.com>
Date: Tue, 18 Jul 2017 01:06:11 -0700
Subject: Protect SSE4 code behind a compile-time flag

---
 src/crypto/sha256.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'src/crypto/sha256.cpp')

diff --git a/src/crypto/sha256.cpp b/src/crypto/sha256.cpp
index 25f4eabd4c..15d6db90c2 100644
--- a/src/crypto/sha256.cpp
+++ b/src/crypto/sha256.cpp
@@ -10,12 +10,14 @@
 #include <atomic>
 
 #if defined(__x86_64__) || defined(__amd64__)
+#if defined(EXPERIMENTAL_ASM)
 #include <cpuid.h>
 namespace sha256_sse4
 {
 void Transform(uint32_t* s, const unsigned char* chunk, size_t blocks);
 }
 #endif
+#endif
 
 // Internal implementation code.
 namespace
@@ -176,7 +178,7 @@ TransformType Transform = sha256::Transform;
 
 std::string SHA256AutoDetect()
 {
-#if defined(__x86_64__) || defined(__amd64__)
+#if defined(EXPERIMENTAL_ASM) && (defined(__x86_64__) || defined(__amd64__))
     uint32_t eax, ebx, ecx, edx;
     if (__get_cpuid(1, &eax, &ebx, &ecx, &edx) && (ecx >> 19) & 1) {
         Transform = sha256_sse4::Transform;
-- 
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