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[Bug tree-optimization/17679] [4.0 Regression] Aliasing problem with ivopts
- From: "rakdver at atrey dot karlin dot mff dot cuni dot cz" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 26 Sep 2004 17:33:51 -0000
- Subject: [Bug tree-optimization/17679] [4.0 Regression] Aliasing problem with ivopts
- References: <20040926155534.17679.rakdver@gcc.gnu.org>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From rakdver at atrey dot karlin dot mff dot cuni dot cz 2004-09-26 17:33 -------
Subject: Re: [4.0 Regression] Aliasing problem with ivopts
Hello,
> As I said in another bug, this really should not be done with the
> subtraction at all, on PPC at least it is better to have different
> IV's for the arrays.
I do not think the memory reference would get expressed in this way on
PPC (if it does, it is a bug in cost function for ivopts and please
create a bugreport for it). However on i686 this seems to be the best
option, taking the register pressure into account.
Zdenek
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=17679