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Eliminate GetGEPGlobalInitializer in favor of the more powerful

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ConstantFoldLoadThroughGEPConstantExpr function in the utils lib.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23446 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-09-26 05:28:52 +00:00
parent 363f2a26d5
commit ebe61201d1
1 changed files with 1 additions and 27 deletions
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28
lib/Transforms/Scalar/SCCP.cpp
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@ -756,32 +756,6 @@ void SCCPSolver::visitGetElementPtrInst(GetElementPtrInst &I) {
markConstant(IV, &I, ConstantExpr::getGetElementPtr(Ptr, Operands));
}
/// GetGEPGlobalInitializer - Given a constant and a getelementptr constantexpr,
/// return the constant value being addressed by the constant expression, or
/// null if something is funny.
///
static Constant *GetGEPGlobalInitializer(Constant *C, ConstantExpr *CE) {
if (CE->getOperand(1) != Constant::getNullValue(CE->getOperand(1)->getType()))
return 0; // Do not allow stepping over the value!
// Loop over all of the operands, tracking down which value we are
// addressing...
for (unsigned i = 2, e = CE->getNumOperands(); i != e; ++i)
if (ConstantUInt *CU = dyn_cast<ConstantUInt>(CE->getOperand(i))) {
ConstantStruct *CS = dyn_cast<ConstantStruct>(C);
if (CS == 0) return 0;
if (CU->getValue() >= CS->getNumOperands()) return 0;
C = CS->getOperand((unsigned)CU->getValue());
} else if (ConstantSInt *CS = dyn_cast<ConstantSInt>(CE->getOperand(i))) {
ConstantArray *CA = dyn_cast<ConstantArray>(C);
if (CA == 0) return 0;
if ((uint64_t)CS->getValue() >= CA->getNumOperands()) return 0;
C = CA->getOperand((unsigned)CS->getValue());
} else
return 0;
return C;
}
void SCCPSolver::visitStoreInst(Instruction &SI) {
if (TrackedGlobals.empty() || !isa<GlobalVariable>(SI.getOperand(1)))
return;
@ -838,7 +812,7 @@ void SCCPSolver::visitLoadInst(LoadInst &I) {
if (GlobalVariable *GV = dyn_cast<GlobalVariable>(CE->getOperand(0)))
if (GV->isConstant() && !GV->isExternal())
if (Constant *V =
GetGEPGlobalInitializer(GV->getInitializer(), CE)) {
ConstantFoldLoadThroughGEPConstantExpr(GV->getInitializer(), CE)) {
markConstant(IV, &I, V);
return;
}