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bug 122:

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- Replace ConstantPointerRef usage with GlobalValue usage
- Correct isa<Constant> for GlobalValue subclass


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14947 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2004-07-18 00:31:05 +00:00
parent 48dc46a512
commit 21cb67e16a
1 changed files with 11 additions and 16 deletions
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27
lib/Transforms/Scalar/SCCP.cpp
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@ -175,13 +175,13 @@ private:
hash_map<Value*, InstVal>::iterator I = ValueState.find(V);
if (I != ValueState.end()) return I->second; // Common case, in the map
if (Constant *CPV = dyn_cast<Constant>(V)) { // Constants are constant
if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
// The address of a global is a constant...
ValueState[V].markConstant(GV);
} else if (Constant *CPV = dyn_cast<Constant>(V)) { // Constants are constant
ValueState[CPV].markConstant(CPV);
} else if (isa<Argument>(V)) { // Arguments are overdefined
ValueState[V].markOverdefined();
} else if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
// The address of a global is a constant...
ValueState[V].markConstant(ConstantPointerRef::get(GV));
}
// All others are underdefined by default...
return ValueState[V];
@ -784,9 +784,6 @@ void SCCP::visitLoadInst(LoadInst &I) {
return;
}
if (ConstantPointerRef *CPR = dyn_cast<ConstantPointerRef>(Ptr))
Ptr = CPR->getValue();
// Transform load (constant global) into the value loaded.
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Ptr))
if (GV->isConstant() && !GV->isExternal()) {
@ -797,15 +794,13 @@ void SCCP::visitLoadInst(LoadInst &I) {
// Transform load (constantexpr_GEP global, 0, ...) into the value loaded.
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ptr))
if (CE->getOpcode() == Instruction::GetElementPtr)
if (ConstantPointerRef *G
= dyn_cast<ConstantPointerRef>(CE->getOperand(0)))
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(G->getValue()))
if (GV->isConstant() && !GV->isExternal())
if (Constant *V =
GetGEPGlobalInitializer(GV->getInitializer(), CE)) {
markConstant(IV, &I, V);
return;
}
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(CE->getOperand(0)))
if (GV->isConstant() && !GV->isExternal())
if (Constant *V =
GetGEPGlobalInitializer(GV->getInitializer(), CE)) {
markConstant(IV, &I, V);
return;
}
}
// Otherwise we cannot say for certain what value this load will produce.