[llvm-bugs] [Bug 43578] h264 (SPEC) : 8% percent perf regression with -march=haswell compared to plain -O3

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=43578

Sanjay Patel <spatel+llvm at rotateright.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Fixed By Commit(s)|                            |r374183
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #2 from Sanjay Patel <spatel+llvm at rotateright.com> ---
I didn't step through the full SPEC example to see what happens, but changing
SLP to use smaller groups of GEPs seems to have restored the perf by preventing
the vectorization entirely in SetupFastFullPelSearch():
https://reviews.llvm.org/rL374183

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