http://llvm.org/bugs/show_bug.cgi?id=22616
Bug ID: 22616
Summary: Performance degradations of several tests from
eembc.2.0 suite and Coremark suite on x86 Avoton-1.7
due to ‘[SimplifyCFG] Be more aggressive’
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected], [email protected],
[email protected], [email protected]
Classification: Unclassified
While our performance testing regressions on tests rgbcmykv2 (more than 20%),
mp4decod, mp2enf32, mp2enfix from eembc.2.0 suite and Coremark test were
detected. Bisect analysis showed LLVM revision 229099 is responsible for these
degradations. This revision enabled ‘[SimplifyCFG] Be more aggressive’ as
described in comments.
commit c76bff0715a253321a33287d8dc319e08f6fee8b
Author: James Molloy <[email protected]>
Date: Fri Feb 13 10:48:30 2015 +0000
[SimplifyCFG] Be more aggressive
Up the phi node folding threshold from a cheap "1" to a meagre "2".
Update tests for extra added selects and slight code churn.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229099
91177308-0d34-0410-b5e6-96231b3b80d8
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