Re: CPU specific/optimized Debian builds ?
Chris Cheney <ccheney@cheney.cx> writes:
> It is pretty well known optimizing for the original pentium causes slow
> downs on newer chips, like p2/p4/athlon, however the bug is in the
> design of the original pentium itself not anything in the software
> optimization. Also using O3 over O2 will usually causes slower running
> programs due to code bloat wrt cpu cache.
Sure, and in any case like this, a given option will be better for
some chips and worse for others. If you turn on the option, life is
better for chip A, and worse for chip B. If you don't turn on the
option, life is worse for chip A, and better for chip B.
None of that is some kind of bug or defect in GCC, but a fact that the
chips have different performance characteristics.
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