[llvm-bugs] [Bug 27359] New: [ppc] LLVM built FDO version of libquantum is slower than base version on power8

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=27359

            Bug ID: 27359
           Summary: [ppc] LLVM built FDO version of libquantum is slower
                    than base version on power8
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: PowerPC
          Assignee: unassignedbugs at nondot.org
          Reporter: carrot at google.com
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

I used the trunk llvm to build libquantum, and found the FDO version is much
slower than base version on power8.

base  407s
fdo   454s

I use following optimization flags

-O2 -fno-strict-aliasing -m64 -mvsx -mcpu=power8

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