[PATCH] D59616: [ARM] Optimize expressions like "return x != 0; " for Thumb1.

[Eli Friedman via Phabricator via llvm-commits]

efriedma created this revision.
efriedma added reviewers: rogfer01, samparker.
Herald added subscribers: jdoerfert, kristof.beyls, javed.absar.
Herald added a project: LLVM.

There's an existing optimization for x != C, but somehow it was missing a special case for 0.

While I'm here, also cleaned up the code/comments a bit: the second value produced by the MERGE_VALUES was actually dead, since a CMOV only produces one result.


Repository:
  rL LLVM

https://reviews.llvm.org/D59616

Files:
  lib/Target/ARM/ARMISelLowering.cpp
  test/CodeGen/ARM/select-imm.ll
  test/CodeGen/Thumb/umulo-128-legalisation-lowering.ll
  test/CodeGen/Thumb/umulo-32-legalisation-lowering.ll

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