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Cleanups suggested by Chris.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112553 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2010-08-30 23:34:17 +00:00
parent 327ca7bec2
commit a081d15b84
1 changed files with 18 additions and 20 deletions
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38
lib/Transforms/Scalar/ValuePropagation.cpp
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@ -53,67 +53,65 @@ Pass *llvm::createValuePropagationPass() {
}
bool ValuePropagation::processSelect(SelectInst *S) {
if (S->getType()->isVectorTy()) return false;
Constant *C = LVI->getConstant(S->getOperand(0), S->getParent());
if (!C) return false;
ConstantInt *CI = dyn_cast<ConstantInt>(C);
if (!CI) return false;
if (CI->isZero()) {
S->replaceAllUsesWith(S->getOperand(2));
S->eraseFromParent();
} else if (CI->isOne()) {
S->replaceAllUsesWith(S->getOperand(1));
S->eraseFromParent();
} else {
assert(0 && "Select on constant is neither 0 nor 1?");
}
S->replaceAllUsesWith(S->getOperand(CI->isOne() ? 1 : 2));
S->eraseFromParent();
++NumSelects;
return true;
}
bool ValuePropagation::processPHI(PHINode *P) {
bool changed = false;
bool Changed = false;
BasicBlock *BB = P->getParent();
for (unsigned i = 0; i < P->getNumIncomingValues(); ++i) {
for (unsigned i = 0, e = P->getNumIncomingValues(); i < e; ++i) {
Value *Incoming = P->getIncomingValue(i);
if (isa<Constant>(Incoming)) continue;
Constant *C = LVI->getConstantOnEdge(P->getIncomingValue(i),
P->getIncomingBlock(i),
BB);
if (!C || C == P->getIncomingValue(i)) continue;
if (!C) continue;
P->setIncomingValue(i, C);
changed = true;
Changed = true;
}
if (Value *ConstVal = P->hasConstantValue()) {
P->replaceAllUsesWith(ConstVal);
P->eraseFromParent();
changed = true;
Changed = true;
}
++NumPhis;
return changed;
return Changed;
}
bool ValuePropagation::runOnFunction(Function &F) {
LVI = &getAnalysis<LazyValueInfo>();
bool changed = false;
bool Changed = false;
for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE; ++FI)
for (BasicBlock::iterator BI = FI->begin(), BE = FI->end(); BI != BE; ) {
Instruction *II = BI++;
if (SelectInst *SI = dyn_cast<SelectInst>(II))
changed |= processSelect(SI);
Changed |= processSelect(SI);
else if (PHINode *P = dyn_cast<PHINode>(II))
changed |= processPHI(P);
Changed |= processPHI(P);
}
if (changed)
if (Changed)
for (Function::iterator FI = F.begin(), FE = F.end(); FI != FE; ++FI)
SimplifyInstructionsInBlock(FI);