On Wed, Mar 14, 2001 at 02:58:40AM -0800, David O'Brien wrote:
> I won't even to there...
Well, the only reason I mentioned it.. was that the pgcc folks don't seem
to be too delusioned about the dangers. -ON (N > 2) is regarded as at
least possibly in danger of generating incorrect code.
> Not untested -- but you should go grab a graduate text on compiler
> optimizations and familiarize yourself with the complexity of the problem.
Care to recommend any starting places. You've piqued my interest.
> If hello_world.c showed a problem with an optimization, I guarantee it
> would be fixed.
Of course depending on the problem.
> The current test case of holding up the entire FreeBSD
> kernel as showing an optimization problem doesn't cut it. If you care to
> trim it down to a single module showing the problem....
Well I've just made buildworld with CFLAGS = "-O2 -march=pentiumpro
-malign-double" from a world built with the same flags. Not so sure of
any performance impact however.
- alex
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