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

[Sanjay Patel via llvm-commits]

spatel created this revision.
spatel added reviewers: hfinkel, zvi, delena, mkuper.
spatel added a subscriber: llvm-commits.
Herald added a subscriber: mcrosier.

Given that this is a common pattern for any ISA that has a 'neg' instruction ( https://llvm.org/bugs/show_bug.cgi?id=30660, https://llvm.org/bugs/show_bug.cgi?id=30661 ), ideally I don't think this should be an x86-specific solution?

But I had problems trying to make this happen as a 'combine' rather than a 'lower' (it interfered with other pattern matching), so this is a minimal solution to hopefully allow progress on adding other transforms for selects of constants.


https://reviews.llvm.org/D25485

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

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