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Move some those Xor simplifications which don't require creating new

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instructions out of InstCombine and into InstructionSimplify.  While
there, introduce an m_AllOnes pattern to simplify matching with integers
and vectors with all bits equal to one.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119536 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan Sands
2010-11-17 18:52:15 +00:00
parent 89e14c7579
commit 2b749870d0
4 changed files with 100 additions and 62 deletions
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5
include/llvm/Analysis/InstructionSimplify.h
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@@ -37,6 +37,11 @@ namespace llvm {
Value *SimplifyOrInst(Value *LHS, Value *RHS, const TargetData *TD = 0,
const DominatorTree *DT = 0);
/// SimplifyXorInst - Given operands for a Xor, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyXorInst(Value *LHS, Value *RHS, const TargetData *TD = 0,
const DominatorTree *DT = 0);
/// SimplifyICmpInst - Given operands for an ICmpInst, see if we can
/// fold the result. If not, this returns null.
Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,