[PATCH] D48877: [X86][BtVer2][MCA] Recognize CMPEQ zero-idioms too

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon added a comment.

I think you're confusing zero-idioms with dependency breaking instructions.

Zero idioms break dependencies, don't use any resources (the frontend just sets the PRF value to zero) and then retires.

PCMPEQ 'ones' patterns can break dependencies but still use resources to set the bits to all ones before retiring.


Repository:
  rL LLVM

https://reviews.llvm.org/D48877