[Bug tree-optimization/33604] [4.3 Regression] Revision 119502 causes significantly slower results with 4.3 compared to 4.2

[dnovillo at google dot com]

------- Comment #14 from dnovillo at google dot com  2007-11-07 12:14 -------
Subject: Re:  [4.3 Regression] Revision 119502 causes significantly slower
results with 4.3 compared to 4.2

On 7 Nov 2007 06:03:09 -0000, paolo dot bonzini at lu dot unisi dot ch
<gcc-bugzilla@gcc.gnu.org> wrote:

> > I don't think we want to start playing with the heuristics ;)  That patch
> > certainly will cause compile-time and memory usage regressions.
>
> Not for -O2, since the default AVG_ALIASED_VOPS is 1.  For -O3 it is 3,
> not huge either.

You'd be surprised.  AVG_ALIASED_VOPS is fairly sensitive wrt
compile-time effects.  You need to test the effects of this change
carefully.


Diego.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33604