[PATCH] D115969: [Support] improve known bits analysis for leading zeros of multiply

[Sanjay Patel via Phabricator via llvm-commits]

spatel updated this revision to Diff 395326.
spatel added a comment.

Patch updated: use multiply with overflow instead of wide multiply for efficiency (and possibly easier to read). This obsoletes any opportunities for an assert AFAICT.


CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D115969/new/

https://reviews.llvm.org/D115969

Files:
  llvm/lib/Support/KnownBits.cpp
  llvm/test/CodeGen/X86/mul128.ll
  llvm/test/Transforms/InstCombine/icmp-mul.ll
  llvm/test/Transforms/InstCombine/narrow-switch.ll
  llvm/test/Transforms/PhaseOrdering/X86/pixel-splat.ll

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