Re: What are the best gcc optimization options for Pentium 200 MMX

[Kris Kennaway]

On Sat, 8 Apr 2000, Alexey N. Dokuchaev wrote:

> AFAIK, Linux Mandrake has it's kernel and userland highly optimized for
> Pentium architecture.  However, they have additional gcc optimization 
> flags turned on by default, including -O3 and -mfast_math.

Can you say "gimmick"? :-) gcc often produces demonstrably broken code for
optimisation levels higher than -O.

Probably the only useful and safe option apart from -O is the
-march=pentium/pentiumpro/pentiumii/etc option for using
processor-specific opcodes and instruction scheduling.

By all means, compile your own system the way you want, but be sure to
recompile with nothing but -O before submitting any bug reports.

Kris

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