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Re: [Bug rtl-optimization/19078] [4.0 Regression] Poor quality code after loop unrolling.
- From: Zdenek Dvorak <rakdver at atrey dot karlin dot mff dot cuni dot cz>
- To: steven at gcc dot gnu dot org <gcc-bugzilla at gcc dot gnu dot org>
- Cc: gcc at gcc dot gnu dot org
- Date: Thu, 10 Feb 2005 12:12:02 +0100
- Subject: Re: [Bug rtl-optimization/19078] [4.0 Regression] Poor quality code after loop unrolling.
- References: <20041219105831.19078.chris@bubblescope.net> <20050210110254.14455.qmail@sourceware.org>
> In comment #3 Zdenek said "Possibly even better would be to add generation of
> autoincrements to loop optimizer, but this would require fixing cse so that it
> handles them correctly." Zdenek, can you elaborate on why CSE needs fixing?
cse does not handle autoincrements. I have no idea what's the problem
there, it is just what I was told when I asked for the possibility to
move the autoinc creation pass last time. Anyone has more precise
information about the nature of the problem?