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--- ./src/sna/compiler.h.orig
+++ ./src/sna/compiler.h
@@ -65,16 +65,14 @@
#define avx2 __attribute__((target("avx2,sse4.2,sse2,fpmath=sse")))
#endif
-#if HAS_GCC(4, 6) && defined(__OPTIMIZE__)
+#if HAS_GCC(4, 6) && !HAS_GCC(5,0) && defined(__OPTIMIZE__)
#define fast __attribute__((optimize("Ofast")))
#else
#define fast
#endif
-#if HAS_GCC(4, 6) && defined(__OPTIMIZE__)
-#define fast_memcpy __attribute__((optimize("Ofast"))) __attribute__((target("inline-all-stringops")))
-#elif HAS_GCC(4, 5) && defined(__OPTIMIZE__)
-#define fast_memcpy __attribute__((target("inline-all-stringops")))
+#if HAS_GCC(4, 5) && defined(__OPTIMIZE__)
+#define fast_memcpy fast __attribute__((target("inline-all-stringops")))
#else
#define fast_memcpy
#endif
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