[PATCH] D12703: [InstCombine] Optimize icmp slt signum(x), 1 --> icmp sle x, 0.

[Sanjoy Das via llvm-commits]

sanjoy updated this revision to Diff 34295.
sanjoy added a comment.

I changed the patternmatch to use to use `getScalarSizeInBits`, but
that does not work with vectors as-is since
`visitICmpInstWithInstAndIntCst` only looks at `ConstantInt`s and not
`ConstantVector`s.  I'm slightly hesitant to add untested code like
this, but given that this is at least partially tested (via the scalar
tests), I'm fine with checking this in if you are.


http://reviews.llvm.org/D12703

Files:
  include/llvm/IR/PatternMatch.h
  lib/Transforms/InstCombine/InstCombineCompares.cpp
  test/Transforms/InstCombine/compare-signs.ll

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