X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=folly%2FChecksum.cpp;h=d8daf66fcd11bd55efebb48403a2b7cba047d9ab;hb=2cf78a6af8777724e6f4329894fcc6e7a0249a60;hp=881fc7d20ff1ff3aa483319c4d290e5fd585e153;hpb=7ec1fc0e0e27ed56c1d18d33af9711a17e9ec750;p=folly.git

diff --git a/folly/Checksum.cpp b/folly/Checksum.cpp
index 881fc7d2..d8daf66f 100644
--- a/folly/Checksum.cpp
+++ b/folly/Checksum.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright 2014 Facebook, Inc.
+ * Copyright 2015 Facebook, Inc.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,13 +25,15 @@ namespace folly {
 namespace detail {
 
 #ifndef __has_builtin
+  /* nolint */
   #define __has_builtin(x) 0
 #endif
 
-#if (__has_builtin(__builtin_ia32_crc32qi) && \
+#if __SSE4_2__ && \
+    ((__has_builtin(__builtin_ia32_crc32qi) && \
      __has_builtin(__builtin_ia32_crc32di)) || \
     (FOLLY_X64 && defined(__GNUC__) && defined(__GNUC_MINOR__) && \
-     (((__GNUC__ * 100) + __GNUC_MINOR__) >= 407))
+     (((__GNUC__ * 100) + __GNUC_MINOR__) >= 407)))
 
 // Fast SIMD implementation of CRC-32C for x86 with SSE 4.2
 uint32_t crc32c_hw(const uint8_t *data, size_t nbytes,