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Replace TraverseGEPInitializer with ConstantFoldLoadThroughGEPConstantExpr

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llvm-svn: 23447
This commit is contained in:
Chris Lattner 2005-09-26 05:34:07 +00:00
parent 7c43a40871
commit 6488c9bbc1
1 changed files with 5 additions and 17 deletions
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22
lib/Transforms/IPO/GlobalOpt.cpp
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@ -297,21 +297,6 @@ static Constant *getAggregateConstantElement(Constant *Agg, Constant *Idx) {
return 0;
}
static Constant *TraverseGEPInitializer(User *GEP, Constant *Init) {
if (Init == 0) return 0;
if (GEP->getNumOperands() == 1 ||
!isa<Constant>(GEP->getOperand(1)) ||
!cast<Constant>(GEP->getOperand(1))->isNullValue())
return 0;
for (unsigned i = 2, e = GEP->getNumOperands(); i != e; ++i) {
ConstantInt *Idx = dyn_cast<ConstantInt>(GEP->getOperand(i));
if (!Idx) return 0;
Init = getAggregateConstantElement(Init, Idx);
if (Init == 0) return 0;
}
return Init;
}
/// CleanupConstantGlobalUsers - We just marked GV constant. Loop over all
/// users of the global, cleaning up the obvious ones. This is largely just a
@ -335,7 +320,7 @@ static bool CleanupConstantGlobalUsers(Value *V, Constant *Init) {
Changed = true;
} else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(U)) {
if (CE->getOpcode() == Instruction::GetElementPtr) {
Constant *SubInit = TraverseGEPInitializer(CE, Init);
Constant *SubInit = ConstantFoldLoadThroughGEPConstantExpr(Init, CE);
Changed |= CleanupConstantGlobalUsers(CE, SubInit);
} else if (CE->getOpcode() == Instruction::Cast &&
isa<PointerType>(CE->getType())) {
@ -348,7 +333,10 @@ static bool CleanupConstantGlobalUsers(Value *V, Constant *Init) {
Changed = true;
}
} else if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(U)) {
Constant *SubInit = TraverseGEPInitializer(GEP, Init);
Constant *SubInit = 0;
ConstantExpr *CE = dyn_cast<ConstantExpr>(ConstantFoldInstruction(GEP));
if (CE && CE->getOpcode() == Instruction::GetElementPtr)
SubInit = ConstantFoldLoadThroughGEPConstantExpr(Init, CE);
Changed |= CleanupConstantGlobalUsers(GEP, SubInit);
if (GEP->use_empty()) {