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[Bug tree-optimization/52868] New: [4.6/4.7/4.8 Regression] 4.6 is faster on Atom
- From: "izamyatin at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Wed, 04 Apr 2012 15:36:38 +0000
- Subject: [Bug tree-optimization/52868] New: [4.6/4.7/4.8 Regression] 4.6 is faster on Atom
- Auto-submitted: auto-generated
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52868
Bug #: 52868
Summary: [4.6/4.7/4.8 Regression] 4.6 is faster on Atom
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: izamyatin@gmail.com
Target: i386
Created attachment 27090
--> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27090
Testcase
For attached case 4.6 is ~10% faster than 4.7 and trunk.
IVopts works differently and it leads to performance degradation
THis is possibly related to http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52272
Command line to reproduce:
-O2 -march=atom -m32 -mtune=atom -msse2 -static