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Patch for a new instcombine xform, patch contributed by Nick Lewycky!

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This implements Transforms/InstCombine/2006-05-10-InvalidIndexUndef.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28450 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2006-05-24 17:34:30 +00:00
parent b464997bba
commit a04c0c417b
1 changed files with 4 additions and 2 deletions
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6
lib/Transforms/Utils/Local.cpp
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@@ -273,7 +273,8 @@ Constant *llvm::ConstantFoldLoadThroughGEPConstantExpr(Constant *C,
} }
} else if (ConstantInt *CI = dyn_cast<ConstantInt>(I.getOperand())) { } else if (ConstantInt *CI = dyn_cast<ConstantInt>(I.getOperand())) {
if (const ArrayType *ATy = dyn_cast<ArrayType>(*I)) { if (const ArrayType *ATy = dyn_cast<ArrayType>(*I)) {
if ((uint64_t)CI->getRawValue() >= ATy->getNumElements()) return 0; if ((uint64_t)CI->getRawValue() >= ATy->getNumElements())
C = UndefValue::get(ATy->getElementType());
if (ConstantArray *CA = dyn_cast<ConstantArray>(C)) if (ConstantArray *CA = dyn_cast<ConstantArray>(C))
C = CA->getOperand((unsigned)CI->getRawValue()); C = CA->getOperand((unsigned)CI->getRawValue());
else if (isa<ConstantAggregateZero>(C)) else if (isa<ConstantAggregateZero>(C))
@@ -283,7 +284,8 @@ Constant *llvm::ConstantFoldLoadThroughGEPConstantExpr(Constant *C,
else else
return 0; return 0;
} else if (const PackedType *PTy = dyn_cast<PackedType>(*I)) { } else if (const PackedType *PTy = dyn_cast<PackedType>(*I)) {
if ((uint64_t)CI->getRawValue() >= PTy->getNumElements()) return 0; if ((uint64_t)CI->getRawValue() >= PTy->getNumElements())
C = UndefValue::get(PTy->getElementType());
if (ConstantPacked *CP = dyn_cast<ConstantPacked>(C)) if (ConstantPacked *CP = dyn_cast<ConstantPacked>(C))
C = CP->getOperand((unsigned)CI->getRawValue()); C = CP->getOperand((unsigned)CI->getRawValue());
else if (isa<ConstantAggregateZero>(C)) else if (isa<ConstantAggregateZero>(C))