[PATCH] D51756: [AArch64] Commute comparisons when it would allow folding.

[Eli Friedman via Phabricator via llvm-commits]

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

Currently, whether we fold a shift or extension operation into a compare depends on whether the foldable operand happens to land on the RHS. Fix it so we consistently put foldable operations on the RHS.

Fixes https://bugs.llvm.org/show_bug.cgi?id=38751


Repository:
  rL LLVM

https://reviews.llvm.org/D51756

Files:
  lib/Target/AArch64/AArch64ISelLowering.cpp
  test/CodeGen/AArch64/cmp-commute.ll
  test/CodeGen/AArch64/lack-of-signed-truncation-check.ll
  test/CodeGen/AArch64/signed-truncation-check.ll

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