[PATCH] D68019: [ARM][CGP] Allow signext arguments

Wed Sep 25 06:35:11 PDT 2019

samparker created this revision.
samparker added reviewers: SjoerdMeijer, efriedma, dmgreen.
Herald added a subscriber: kristof.beyls.

As we perform a zext on any arguments used in the promoted tree, it doesn't matter if they're marked as signext. The only permitted user(s) in the tree which would interpret the sign bits are signed icmps. For these instructions, their promoted operands are truncated before the icmp uses them.

https://reviews.llvm.org/D68019

Files:
  lib/Target/ARM/ARMCodeGenPrepare.cpp
  test/CodeGen/ARM/CGP/arm-cgp-overflow.ll
  test/CodeGen/ARM/CGP/arm-cgp-phis-ret.ll
  test/CodeGen/ARM/CGP/arm-cgp-signed.ll

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