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Things are really unstable and Im using -O9 -ffast-math -fomit-frame-pointer optimizations. What gives?

April 26, 2017gives optimizations unstable

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Things are really unstable and Im using -O9 -ffast-math -fomit-frame-pointer optimizations. What gives?

1 Answer

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Don’t bother using anything higher than -O3 since it isn’t supported by current versions of gcc. Very aggressive optimizations sometimes cause the compiler to streamline the assembly code to the point where it doesn’t quite do the same thing anymore. Please try to compile with CFLAGS -O2 -march= before reporting a bug.