[PATCH] D25485: [x86] use 'neg' for negation of bool

[Sanjay Patel via llvm-commits]

spatel updated this revision to Diff 74517.
spatel added a comment.

Patch updated:
This is still an x86-only solution, but now we correctly mask the operand before negation. As Eli noted, the mask is optimized away when we know the operand's top bits are already zero (via zeroext on the input parameter in the test cases).


https://reviews.llvm.org/D25485

Files:
  lib/Target/X86/X86ISelLowering.cpp
  test/CodeGen/X86/negate-i1.ll

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