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Implement Assembler/2003-08-21-ConstantExprCast-Fold.llx

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@8015 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-08-21 19:45:55 +00:00
parent 9d26c790f7
commit 0425a87a62
1 changed files with 12 additions and 2 deletions
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14
lib/VMCore/ConstantFold.cpp
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@ -95,6 +95,17 @@ Constant *ConstantFoldCastInstruction(const Constant *V, const Type *DestTy) {
if (S1 <= S2 && S2 >= S3 && S1 <= S3)
return ConstantExpr::getCast(Op, DestTy);
}
} else if (CE->getOpcode() == Instruction::GetElementPtr) {
// If all of the indexes in the GEP are null values, there is no pointer
// adjustment going on. We might as well cast the source pointer.
bool isAllNull = true;
for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
if (!CE->getOperand(i)->isNullValue()) {
isAllNull = false;
break;
}
if (isAllNull)
return ConstantExpr::getCast(CE->getOperand(0), DestTy);
}
return ConstRules::get(*V, *V)->castTo(V, DestTy);
@ -137,9 +148,8 @@ Constant *ConstantFoldGetElementPtr(const Constant *C,
(IdxList.size() == 1 && IdxList[0]->isNullValue()))
return const_cast<Constant*>(C);
// If C is null and all idx's are null, return null of the right type.
// TODO If C is null and all idx's are null, return null of the right type.
// FIXME: Implement folding of GEP constant exprs the same as instcombine does
if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
// Combine Indices - If the source pointer to this getelementptr instruction