There are some mistake in your reasons of performance increase. (I'm work in computational optimitation and i'm a newbie boys of gcc@...)
tree-ssa will be avaible only from gcc 4.0 (next major)
the flag -msse or -msse2 can or cannot increase your performance, but they don't activate vectoritation, they only ask to the compiler to use simd instruction (see gcc's info)
you can yous -mfpmath=sse,387 (as from gcc's info).
30% it's a good result, but how do you obtain this number? (old perl version, old flags, old compilers flag etc.)
Recompiling can however increase your performance (Slack + Gentoo rules ;))
P.S.
The intel C compiler works fine in vectoritation but:
1) No source code
2) No good code for Non-Intel
3) No AMD64 support
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