[PATCH] D52463: [ARM] Fix for PR39060

[Sam Parker via Phabricator via llvm-commits]

samparker created this revision.
samparker added reviewers: hans, SjoerdMeijer.
Herald added subscribers: chrib, kristof.beyls, srhines.
Herald added a reviewer: javed.absar.

When calculating whether a value can safely overflow for use by an icmp, we weren't checking that the value couldn't wrap around. To do this we need the icmp to be using a constant, as well as the incoming add or sub.

bugzilla report: https://bugs.llvm.org/show_bug.cgi?id=39060


https://reviews.llvm.org/D52463

Files:
  lib/Target/ARM/ARMCodeGenPrepare.cpp
  test/CodeGen/ARM/arm-cgp-overflow.ll
  test/CodeGen/ARM/arm-cgp-signed-icmps.ll
  test/CodeGen/ARM/pr39060.ll

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