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