[PATCH] D32916: [DAGCombine] (addcarry 0, 0, X) -> (ext/trunc X)

[Amaury SECHET via Phabricator via llvm-commits]

deadalnix created this revision.

While this makes some case better and some case worse - so it's unclear if it is a worthy combine just by itself - this is a useful canonicalisation.

As per discussion in https://reviews.llvm.org/D32756 .


https://reviews.llvm.org/D32916

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/X86/addcarry.ll
  test/CodeGen/X86/mul-i1024.ll
  test/CodeGen/X86/mul-i256.ll
  test/CodeGen/X86/mul-i512.ll
  test/CodeGen/X86/overflow.ll

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