[PATCH] D53067: [AArch64] Swap comparison operands if that enables some folding.

[Arnaud A. de Grandmaison via Phabricator via llvm-commits]

aadg created this revision.
aadg added reviewers: efriedma, t.p.northover.
Herald added subscribers: kristof.beyls, mcrosier.
Herald added a reviewer: javed.absar.

AArch64 can fold some shift+extend operations on the RHS operand of
comparisons, so swap the operands if that makes sense.

This provides a fix for https://bugs.llvm.org/show_bug.cgi?id=38751


Repository:
  rL LLVM

https://reviews.llvm.org/D53067

Files:
  lib/Target/AArch64/AArch64ISelLowering.cpp
  test/CodeGen/AArch64/and-mask-removal.ll
  test/CodeGen/AArch64/lack-of-signed-truncation-check.ll
  test/CodeGen/AArch64/sat-add.ll
  test/CodeGen/AArch64/signed-truncation-check.ll
  test/CodeGen/AArch64/swap-compare-operands.ll

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