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[Bug middle-end/32044] [4.3 regression] udivdi3 counterproductive, unwarranted use
- From: "rguenther at suse dot de" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 9 Nov 2007 17:11:48 -0000
- Subject: [Bug middle-end/32044] [4.3 regression] udivdi3 counterproductive, unwarranted use
- References: <bug-32044-11706@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #24 from rguenther at suse dot de 2007-11-09 17:11 -------
Subject: Re: [4.3 regression] udivdi3 counterproductive,
unwarranted use
On Fri, 9 Nov 2007, bunk at stusta dot de wrote:
> ------- Comment #23 from bunk at stusta dot de 2007-11-09 17:09 -------
> We need a way to globally prevent it in the kernel or it will be a repeating
> source of problems there.
>
> Is -fno-tree-scev-cprop a reasonable (and not too expensive) workaround for the
> Linux kernel?
Yes, as is using volatile on this particular loop variable.
Richard.
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32044