Unreviewed patch: Old loop optimizer clobbers frame pointer
Björn Haase
bjoern.m.haase@web.de
Sun Jun 19 10:18:00 GMT 2005
Roger Sayle wrote on Sonntag, 19. Juni 2005 00:50 :
> On Sat, 18 Jun 2005, Ulrich Weigand wrote:
> > http://gcc.gnu.org/ml/gcc-patches/2005-06/msg00157.html
>
> This is OK for mainline. I agree that the risks of moving modifications
> to the frame pointer (especially in the presence of pseudos) outway the
> potential performance benefits. If we ever identify any cases where this
> transformation is worthwhile, we can at that point investigate alternate
> approaches, such as recording the dependency between all pseudos and
> frame_pointer_rtx. However, this fix seems preferable for now.
>
> Roger
> --
Hi,
I'd just like to draw your attention to PR21990 "reload absentmindly clobbers
frame pointer". Is it possible that both problems have the same origin? I
have tried Ulrich's patch, but it did not help for the test case of PR21990.
Yours,
Björn
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