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Add convenience functions for creating inbounds GEPs.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78695 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2009-08-11 17:57:01 +00:00
parent 7cd0118c36
commit e2574d3215
7 changed files with 164 additions and 6 deletions
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20
lib/VMCore/Constants.cpp
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@@ -1363,6 +1363,7 @@ Constant* ConstantExpr::getSizeOf(const Type* Ty) {
Constant* ConstantExpr::getAlignOf(const Type* Ty) {
// alignof is implemented as: (i64) gep ({i8,Ty}*)null, 0, 1
// Note that a non-inbounds gep is used, as null isn't within any object.
const Type *AligningTy = StructType::get(Ty->getContext(),
Type::Int8Ty, Ty, NULL);
Constant *NullPtr = Constant::getNullValue(AligningTy->getPointerTo());
@@ -1438,11 +1439,30 @@ Constant *ConstantExpr::getGetElementPtr(Constant *C, Value* const *Idxs,
return getGetElementPtrTy(PointerType::get(Ty, As), C, Idxs, NumIdx);
}
Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
Value* const *Idxs,
unsigned NumIdx) {
// Get the result type of the getelementptr!
const Type *Ty =
GetElementPtrInst::getIndexedType(C->getType(), Idxs, Idxs+NumIdx);
assert(Ty && "GEP indices invalid!");
unsigned As = cast<PointerType>(C->getType())->getAddressSpace();
Constant *Result = getGetElementPtrTy(PointerType::get(Ty, As), C,
Idxs, NumIdx);
cast<GEPOperator>(Result)->setIsInBounds(true);
return Result;
}
Constant *ConstantExpr::getGetElementPtr(Constant *C, Constant* const *Idxs,
unsigned NumIdx) {
return getGetElementPtr(C, (Value* const *)Idxs, NumIdx);
}
Constant *ConstantExpr::getInBoundsGetElementPtr(Constant *C,
Constant* const *Idxs,
unsigned NumIdx) {
return getInBoundsGetElementPtr(C, (Value* const *)Idxs, NumIdx);
}
Constant *
ConstantExpr::getICmp(unsigned short pred, Constant* LHS, Constant* RHS) {