[all-commits] [llvm/llvm-project] 5f48c1: [AArch64][GlobalISel] Use ZExtValue for zext(xor) ...

[Guo-Peilin via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 5f48c144c58f6d23e850a1978a6fe05887103b17
      https://github.com/llvm/llvm-project/commit/5f48c144c58f6d23e850a1978a6fe05887103b17
  Author: guopeilin <guopeilin1 at huawei.com>
  Date:   2021-09-06 (Mon, 06 Sep 2021)

  Changed paths:
    M llvm/lib/Target/AArch64/GISel/AArch64InstructionSelector.cpp
    M llvm/test/CodeGen/AArch64/GlobalISel/opt-fold-xor-tbz-tbnz.mir

  Log Message:
  -----------
  [AArch64][GlobalISel] Use ZExtValue for zext(xor) when invert tb(n)z

Currently, we use SExtValue to decide whether to invert tbz or tbnz.
However, for the case zext (xor x, c), we should use ZExt rather
than SExt otherwise we will generate totally opposite branches.

Reviewed By: paquette

Differential Revision: https://reviews.llvm.org/D108755