[PATCH] D48376: DAG: Fold out selects with an undef operand

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added a reviewer: kparzysz.
Herald added subscribers: nhaehnle, wdng, qcolombet.
Herald added a reviewer: javed.absar.

Instcombine already does this, but this can appear during legalization.

test/CodeGen/Hexagon/expand-vselect-kill.ll completely changes when fixed, and I'm not sure what exactly it was looking for in the first place


https://reviews.llvm.org/D48376

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/AArch64/half.ll
  test/CodeGen/AMDGPU/select-undef.ll
  test/CodeGen/ARM/sub-cmp-peephole.ll
  test/CodeGen/Hexagon/autohvx/isel-extractelt-illegal-type.ll
  test/CodeGen/Hexagon/expand-vselect-kill.ll
  test/CodeGen/Hexagon/swp-const-tc1.ll
  test/CodeGen/X86/2012-08-07-CmpISelBug.ll
  test/CodeGen/X86/hoist-spill.ll
  test/CodeGen/X86/pr31045.ll
  test/CodeGen/X86/pr32610.ll

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