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factor statistic updating better.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92362 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-12-31 17:51:05 +00:00
parent 4760467ff2
commit 9fdaefad58
1 changed files with 9 additions and 19 deletions
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28
lib/Transforms/Scalar/Reassociate.cpp
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@ -563,15 +563,11 @@ static Value *OptimizeAndOrXor(unsigned Opcode, std::vector<ValueEntry> &Ops) {
Value *X = BinaryOperator::getNotArgument(Ops[i].Op);
unsigned FoundX = FindInOperandList(Ops, i, X);
if (FoundX != i) {
if (Opcode == Instruction::And) { // ...&X&~X = 0
++NumAnnihil;
if (Opcode == Instruction::And) // ...&X&~X = 0
return Constant::getNullValue(X->getType());
}
if (Opcode == Instruction::Or) { // ...|X|~X = -1
++NumAnnihil;
if (Opcode == Instruction::Or) // ...|X|~X = -1
return Constant::getAllOnesValue(X->getType());
}
}
}
@ -586,10 +582,9 @@ static Value *OptimizeAndOrXor(unsigned Opcode, std::vector<ValueEntry> &Ops) {
++NumAnnihil;
} else {
assert(Opcode == Instruction::Xor);
if (e == 2) {
++NumAnnihil;
if (e == 2)
return Constant::getNullValue(Ops[0].Op->getType());
}
// ... X^X -> ...
Ops.erase(Ops.begin()+i, Ops.begin()+i+2);
i -= 1; e -= 2;
@ -618,10 +613,8 @@ Value *Reassociate::OptimizeAdd(std::vector<ValueEntry> &Ops) {
continue;
// Remove X and -X from the operand list.
if (Ops.size() == 2) {
++NumAnnihil;
if (Ops.size() == 2)
return Constant::getNullValue(X->getType());
}
Ops.erase(Ops.begin()+i);
if (i < FoundX)
@ -657,11 +650,9 @@ Value *Reassociate::OptimizeExpression(BinaryOperator *I,
switch (Opcode) {
default: break;
case Instruction::And:
if (CstVal->isZero()) { // ... & 0 -> 0
++NumAnnihil;
if (CstVal->isZero()) // ... & 0 -> 0
return CstVal;
}
if (CstVal->isAllOnesValue()) // ... & -1 -> ...
if (CstVal->isAllOnesValue()) // ... & -1 -> ...
Ops.pop_back();
break;
case Instruction::Mul:
@ -674,10 +665,8 @@ Value *Reassociate::OptimizeExpression(BinaryOperator *I,
Ops.pop_back(); // ... * 1 -> ...
break;
case Instruction::Or:
if (CstVal->isAllOnesValue()) { // ... | -1 -> -1
++NumAnnihil;
if (CstVal->isAllOnesValue()) // ... | -1 -> -1
return CstVal;
}
// FALLTHROUGH!
case Instruction::Add:
case Instruction::Xor:
@ -883,6 +872,7 @@ void Reassociate::ReassociateExpression(BinaryOperator *I) {
DEBUG(errs() << "Reassoc to scalar: " << *V << "\n");
I->replaceAllUsesWith(V);
RemoveDeadBinaryOp(I);
++NumAnnihil;
return;
}