diff -up xf86-video-intel-20150520/src/sna/compiler.h.jx xf86-video-intel-20150520/src/sna/compiler.h
--- xf86-video-intel-20150520/src/sna/compiler.h.jx	2015-05-19 07:44:26.000000000 -0400
+++ xf86-video-intel-20150520/src/sna/compiler.h	2015-05-20 12:53:54.797918726 -0400
@@ -64,7 +64,7 @@
 #endif
 
 #if HAS_GCC(4, 6) && defined(__OPTIMIZE__)
-#define fast __attribute__((optimize("Ofast")))
+#define fast __attribute__((optimize("O3")))
 #else
 #define fast
 #endif