Normalize SSE support detection

[folly.git] / folly / Portability.h

diff --git a/folly/Portability.h b/folly/Portability.h
index a9c3679313f38c892380ac1a923a18776d1672e5..7f7a8a1fe6e4defe03fce87bff918f146840c2c9 100644 (file)
--- a/folly/Portability.h
+++ b/folly/Portability.h
@@ -261,6 +261,32 @@ typedef SSIZE_T ssize_t;
 // compiler specific to compiler specific
 // nolint
 # define __PRETTY_FUNCTION__ __FUNCSIG__
+
+// Hide a GCC specific thing that breaks MSVC if left alone.
+# define __extension__
+
+#ifdef _M_IX86_FP
+# define FOLLY_SSE _M_IX86_FP
+#endif
+
+#endif
+
+#ifndef FOLLY_SSE
+# if defined(__SSE4_2__)
+#  define FOLLY_SSE 4.2
+# elif defined(__SSE4_1__)
+#  define FOLLY_SSE 4.1
+# elif defined(__SSE4__)
+#  define FOLLY_SSE 4
+# elif defined(__SSE3__)
+#  define FOLLY_SSE 3
+# elif defined(__SSE2__)
+#  define FOLLY_SSE 2
+# elif defined(__SSE__)
+#  define FOLLY_SSE 1
+# else
+#  define FOLLY_SSE 0
+# endif
 #endif
 
 #if FOLLY_UNUSUAL_GFLAGS_NAMESPACE