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[Bug middle-end/44297] Big spec cpu2006 prefetch regressions on gcc 4.6 on x86
- From: "changpeng dot fang at amd dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 28 May 2010 18:30:14 -0000
- Subject: [Bug middle-end/44297] Big spec cpu2006 prefetch regressions on gcc 4.6 on x86
- References: <bug-44297-18740@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #8 from changpeng dot fang at amd dot com 2010-05-28 18:30 -------
(In reply to comment #4)
> Created an attachment (id=20767)
--> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=20767&action=view) [edit]
> Patch that makes loop invariant prefetches backend specfic
>
> Three observations:
>
> 1. the patch had a bug which let to wrong calculation in some cases
> This commit should be applied to improve some other testcases:
> http://gcc.gnu.org/viewcvs?view=revision&revision=159816
Looks like this is a fix to the regressions. That is, the regressions are
actually caused by the wrong calculation. This bug could be considered fixed,
even though performance tuning may be necessary for non-constant step
prefetching. Thanks.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44297