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Erik de Castro Lopo authored
Previously CFLAGS had a -O3 at the start and a -O2 at the end. According to the GCC docs: https://gcc.gnu.org/onlinedocs/gcc-4.9.1/gcc/Optimize-Options.html "If you use multiple -O options, with or without level numbers, the last such option is the one that is effective" which means that GCC doesn't try to use SIMD to vectorize the code, etc."
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