https://llvm.org/bugs/show_bug.cgi?id=29051
Bug ID: 29051
Summary: Himeno performance regression since r243460
Product: libraries
Version: 3.8
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P
Component: Scalar Optimizations
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Classification: Unclassified
Himeno Benchmark v 3.0 performance decreases by ~13% after r243460.
Steps to reproduce:
$ export CC=clang
$ export CFLAGS="-O3 -march=native"
$ phoronix-test-suite run pts/himeno
Or you should be able to use the llvm test suite version:
https://llvm.org/svn/llvm-project/test-suite/trunk/SingleSource/Benchmarks/Misc/himenobmtxpa.c
On my system,
gcc 5.4 : 1122.2
clang 243459: 946.7
clang 243460: 840.6
I bisected the regression down to this commit:
http://llvm.org/viewvc/llvm-project?view=revision&revision=243460
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