https://bugs.llvm.org/show_bug.cgi?id=41188
Bug ID: 41188
Summary: Unprofitable target specific vectorization
Product: libraries
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: david.bolvan...@gmail.com
CC: craig.top...@gmail.com, llvm-bugs@lists.llvm.org,
llvm-...@redking.me.uk, spatel+l...@rotateright.com
I checked this "benchmark": https://godbolt.org/z/IrAj-o
-O3 on haswell X86-64, 4720HQ - cca 1.9s
-O3 -mtune=native -march=native - cca 2.1s
Seems like we have a regression there too. Just looking at the godbolt results,
the slower code contains a vectorized code, standard -O3 avoids vectorization.
Maybe cost model issue for Haswell ?
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