GCC

How should i compile my programs?
i have this in my .bashrc

alias gcc='gcc -W -Wall -std=c99'

Why do Gentoo-fags always pick CFLAGS that are inappropriate for the processor architecture?  Unrolling loops (and a lot of other optimisations) will blow your cache, and on an x86 or PowerPC, everything else is insignificant compared to the cost of a main memory fetch.  Just use -pipe -Os (and maybe -m64).