[llvm-bugs] [Bug 29051] New: Himeno performance regression since r243460

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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: unassignedbugs at nondot.org
          Reporter: lukebenes at hotmail.com
                CC: llvm-bugs at lists.llvm.org
    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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