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: unassignedb...@nondot.org
Reporter: car...@google.com
CC: llvm-bugs@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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