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Fix InstCombine/load.ll & PR347. 

This code hadn't been updated after the "structs with more than 256 elements"
related changes to the GEP instruction.  Also it was not handling the
ConstantAggregateZero class.

Now it does!

llvm-svn: 13834
This commit is contained in:
Chris Lattner 2004-05-27 17:30:27 +00:00
parent 9b38743684
commit ed79d8af53
1 changed files with 24 additions and 12 deletions
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36
llvm/lib/Transforms/Scalar/InstructionCombining.cpp
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@ -2852,19 +2852,31 @@ static Constant *GetGEPGlobalInitializer(Constant *C, ConstantExpr *CE) {
// 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->getValues().size()) return 0;
C = cast<Constant>(CS->getValues()[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->getValues().size()) return 0;
C = cast<Constant>(CA->getValues()[CS->getValue()]);
} else
gep_type_iterator I = gep_type_begin(CE), E = gep_type_end(CE);
for (++I; I != E; ++I)
if (const StructType *STy = dyn_cast<StructType>(*I)) {
ConstantUInt *CU = cast<ConstantUInt>(I.getOperand());
assert(CU->getValue() < STy->getNumElements() &&
"Struct index out of range!");
if (ConstantStruct *CS = dyn_cast<ConstantStruct>(C)) {
C = cast<Constant>(CS->getValues()[CU->getValue()]);
} else if (isa<ConstantAggregateZero>(C)) {
C = Constant::getNullValue(STy->getElementType(CU->getValue()));
} else {
return 0;
}
} else if (ConstantInt *CI = dyn_cast<ConstantInt>(I.getOperand())) {
const ArrayType *ATy = cast<ArrayType>(*I);
if ((uint64_t)CI->getRawValue() >= ATy->getNumElements()) return 0;
if (ConstantArray *CA = dyn_cast<ConstantArray>(C))
C = cast<Constant>(CA->getValues()[CI->getRawValue()]);
else if (isa<ConstantAggregateZero>(C))
C = Constant::getNullValue(ATy->getElementType());
else
return 0;
} else {
return 0;
}
return C;
}