[PATCH] D29587: [DAGCombiner] mulhi + 1 never overflow.

[Amaury SECHET via Phabricator via llvm-commits]

deadalnix created this revision.

This can be used to optimize large multiplications after legalization.

Depends on https://reviews.llvm.org/D29565


https://reviews.llvm.org/D29587

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

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