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increase const goodness and remove pointless getUser() calls

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99395 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Gabor Greif 2010-03-24 10:29:52 +00:00
parent 5eff285d8d
commit bd1f99341e
1 changed files with 9 additions and 7 deletions
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16
lib/Transforms/Scalar/SCCP.cpp
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@ -1705,28 +1705,30 @@ ModulePass *llvm::createIPSCCPPass() {
}
static bool AddressIsTaken(GlobalValue *GV) {
static bool AddressIsTaken(const GlobalValue *GV) {
// Delete any dead constantexpr klingons.
GV->removeDeadConstantUsers();
for (Value::use_iterator UI = GV->use_begin(), E = GV->use_end();
UI != E; ++UI)
if (StoreInst *SI = dyn_cast<StoreInst>(*UI)) {
for (Value::use_const_iterator UI = GV->use_begin(), E = GV->use_end();
UI != E; ++UI) {
const User *U = *UI;
if (const StoreInst *SI = dyn_cast<StoreInst>(U)) {
if (SI->getOperand(0) == GV || SI->isVolatile())
return true; // Storing addr of GV.
} else if (isa<InvokeInst>(*UI) || isa<CallInst>(*UI)) {
} else if (isa<InvokeInst>(U) || isa<CallInst>(U)) {
// Make sure we are calling the function, not passing the address.
if (UI.getOperandNo() != 0)
return true;
} else if (LoadInst *LI = dyn_cast<LoadInst>(*UI)) {
} else if (const LoadInst *LI = dyn_cast<LoadInst>(U)) {
if (LI->isVolatile())
return true;
} else if (isa<BlockAddress>(*UI)) {
} else if (isa<BlockAddress>(U)) {
// blockaddress doesn't take the address of the function, it takes addr
// of label.
} else {
return true;
}
}
return false;
}