[PATCH] D30741: [DAG] recognize div/rem by 0 as undef before trying constant folding

[Sanjay Patel via Phabricator via llvm-commits]

spatel updated this revision to Diff 91029.
spatel edited the summary of this revision.
spatel added a comment.

Patch updated:
Changing the definition of isConstantOrConstantVector() to include undef may have unintended consequences (there's a test in test/CodeGen/ARM/select.ll that will trigger the assert in foldBinOpIntoSelect()), so just assert that an undef result from DAG.getNode() is ok for now.


https://reviews.llvm.org/D30741

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  lib/CodeGen/SelectionDAG/SelectionDAG.cpp
  test/CodeGen/X86/div-rem-simplify.ll

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