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[Bug tree-optimization/84737] [8 Regression] 20% degradation in CPU2000 172.mgrid starting with r256888
- From: "pthaugen at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Thu, 08 Mar 2018 17:26:32 +0000
- Subject: [Bug tree-optimization/84737] [8 Regression] 20% degradation in CPU2000 172.mgrid starting with r256888
- Auto-submitted: auto-generated
- References: <bug-84737-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84737
--- Comment #5 from Pat Haugen <pthaugen at gcc dot gnu.org> ---
Created attachment 43601
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43601&action=edit
ipa-cp dump (r256887)
(In reply to Martin Liška from comment #4)
> Thank you, may I please ask you for the IPA CP dump file for not affected
> revision (r256887). Do I understand the numbers right that version with
> .resid_.constprop.1 is slower?
Dump attached. And yes, the version with resid_.constprop.1 is slower.
Also, I tried the patch from
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84149#c5 and didn't see any
difference in execution time.