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Implement another getelementptr folding opportunity that arises when

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linking stuff with appending linkage


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6180 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-05-13 21:50:52 +00:00
parent 9bc02a4deb
commit 0ec3590664
1 changed files with 16 additions and 0 deletions
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16
lib/VMCore/ConstantFold.cpp
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@ -150,6 +150,22 @@ Constant *ConstantFoldGetElementPtr(const Constant *C,
// 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
// Implement folding of:
// int* getelementptr ([2 x int]* cast ([3 x int]* %X to [2 x int]*),
// long 0, long 0)
// To: int* getelementptr ([3 x int]* %X, long 0, long 0)
//
if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C))
if (CE->getOpcode() == Instruction::Cast && IdxList.size() > 1)
if (const PointerType *SPT =
dyn_cast<PointerType>(CE->getOperand(0)->getType()))
if (const ArrayType *SAT = dyn_cast<ArrayType>(SPT->getElementType()))
if (const ArrayType *CAT =
dyn_cast<ArrayType>(cast<PointerType>(C->getType())->getElementType()))
if (CAT->getElementType() == SAT->getElementType())
return ConstantExpr::getGetElementPtr(
(Constant*)cast<Constant>(CE->getOperand(0)), IdxList);
return 0;
}