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Move "A | ~(A & ?) -> -1" from InstCombine to InstructionSimplify.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126082 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Benjamin Kramer
2011-02-20 15:20:01 +00:00
parent 91e37ef278
commit 38f7f66fcc
2 changed files with 18 additions and 16 deletions
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lib/Transforms/InstCombine/InstCombineAndOrXor.cpp
+8 -16
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@@ -1919,24 +1919,16 @@ Instruction *InstCombiner::visitOr(BinaryOperator &I) {
// A | ~(A | B) -> A | ~B
// A | ~(A ^ B) -> A | ~B
// A | ~(A & B) -> -1
if (match(Op1, m_Not(m_Value(A))))
if (BinaryOperator *B = dyn_cast<BinaryOperator>(A))
if (Op0 == B->getOperand(0) || Op0 == B->getOperand(1))
switch (B->getOpcode()) {
default: break;
case Instruction::Or:
case Instruction::Xor:
if (Op1->hasOneUse()) {
Value *NotOp = Op0 == B->getOperand(0) ? B->getOperand(1) :
B->getOperand(0);
Value *Not = Builder->CreateNot(NotOp, NotOp->getName()+".not");
return BinaryOperator::CreateOr(Not, Op0);
}
break;
case Instruction::And:
return ReplaceInstUsesWith(I, Constant::getAllOnesValue(I.getType()));
}
if ((Op0 == B->getOperand(0) || Op0 == B->getOperand(1)) &&
Op1->hasOneUse() && (B->getOpcode() == Instruction::Or ||
B->getOpcode() == Instruction::Xor)) {
Value *NotOp = Op0 == B->getOperand(0) ? B->getOperand(1) :
B->getOperand(0);
Value *Not = Builder->CreateNot(NotOp, NotOp->getName()+".not");
return BinaryOperator::CreateOr(Not, Op0);
}
if (ICmpInst *RHS = dyn_cast<ICmpInst>(I.getOperand(1)))
if (ICmpInst *LHS = dyn_cast<ICmpInst>(I.getOperand(0)))