[PATCH] D17630: [x86, SSE] fold 'isPositive' vector integer operations (PR26701)

[Sanjay Patel via llvm-commits]

spatel created this revision.
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This is one of the cases shown in:
https://llvm.org/bugs/show_bug.cgi?id=26701

Shift and negate is what InstCombine appears to prefer, so I've started with that pattern. Note that the 'pcmpeq' instructions are always generating the negative one for the actual 'pcmpgt' comparison in each case.

http://reviews.llvm.org/D17630

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/vector-pcmp.ll

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