[PATCH] D110867: X86InstrInfo: Support immediates that are +1/-1 different in optimizeCompareInstr

Thu Dec 9 07:59:00 PST 2021

bgraur added a comment.

We have root caused to this revision a mis-compile affecting `AMD Rome` machines.
I have attached a reproducer program that shows the problem when compiled with `-O2` or `-O3`.

Please revert this change until you have a chance to look at the problem.

NOTE: the repro uses the abseil library that can be found at https://github.com/abseil/abseil-cpp.
The reproducer might probably be reduced more (if needed) but it would be great if you could{F20964863 <https://reviews.llvm.org/F20964863>} revert early.

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D110867/new/

https://reviews.llvm.org/D110867