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ConstantFoldLoadThroughGEPConstantExpr wasn't handling pointers to
packed types correctly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25470 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -267,16 +267,29 @@ Constant *llvm::ConstantFoldLoadThroughGEPConstantExpr(Constant *C,
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return 0;
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}
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} else if (ConstantInt *CI = dyn_cast<ConstantInt>(I.getOperand())) {
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const ArrayType *ATy = cast<ArrayType>(*I);
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if ((uint64_t)CI->getRawValue() >= ATy->getNumElements()) return 0;
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if (ConstantArray *CA = dyn_cast<ConstantArray>(C))
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C = CA->getOperand((unsigned)CI->getRawValue());
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else if (isa<ConstantAggregateZero>(C))
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C = Constant::getNullValue(ATy->getElementType());
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else if (isa<UndefValue>(C))
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C = UndefValue::get(ATy->getElementType());
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else
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if (const ArrayType *ATy = dyn_cast<ArrayType>(*I)) {
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if ((uint64_t)CI->getRawValue() >= ATy->getNumElements()) return 0;
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if (ConstantArray *CA = dyn_cast<ConstantArray>(C))
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C = CA->getOperand((unsigned)CI->getRawValue());
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else if (isa<ConstantAggregateZero>(C))
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C = Constant::getNullValue(ATy->getElementType());
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else if (isa<UndefValue>(C))
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C = UndefValue::get(ATy->getElementType());
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else
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return 0;
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} else if (const PackedType *PTy = dyn_cast<PackedType>(*I)) {
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if ((uint64_t)CI->getRawValue() >= PTy->getNumElements()) return 0;
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if (ConstantPacked *CP = dyn_cast<ConstantPacked>(C))
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C = CP->getOperand((unsigned)CI->getRawValue());
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else if (isa<ConstantAggregateZero>(C))
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C = Constant::getNullValue(PTy->getElementType());
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else if (isa<UndefValue>(C))
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C = UndefValue::get(PTy->getElementType());
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else
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return 0;
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} else {
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return 0;
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}
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} else {
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return 0;
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}
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