[PATCH] D48765: [X86] The TEST instruction is eliminated when BSF/TZCNT is used

[Ivan Kulagin via Phabricator via llvm-commits]

ikulagin updated this revision to Diff 154546.
ikulagin added a comment.

> Or you should just check the CC in the first if, then select your Add and your possible constant. And check that it is an Add and a constant.

DONE.

> Probably should make sure the add only has one user. Otherwise you're increasing code size.

DONE.

> We need tests cases that use tzcnt too.

Tests added.


Repository:
  rL LLVM

https://reviews.llvm.org/D48765

Files:
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86InstrInfo.cpp
  test/CodeGen/X86/dagcombine-select.ll

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