GCC recommendations and options for fastest code

Question

I\'m distributing a C++ program with a makefile for the Unix version, and I\'m wondering what compiler options I should use to get the fastest possible code (it falls into t

Answer 1

-oFast

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Please try -oFast instead of -o3

Also here is a list of flags you might want to selectively enable.

-ffloat-store

-fexcess-precision=style

-ffast-math

-fno-rounding-math

-fno-signaling-nans

-fcx-limited-range

-fno-math-errno

-funsafe-math-optimizations

-fassociative-math

-freciprocal-math

-ffinite-math-only

-fno-signed-zeros

-fno-trapping-math

-frounding-math

-fsingle-precision-constant

-fcx-fortran-rules

A complete list of the flags and their detailed description is available here