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Implement testcase: Assembler/2003-08-20-ConstantExprGEP-Fold.llx
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7983 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -142,23 +142,27 @@ Constant *ConstantFoldGetElementPtr(const Constant *C,
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// FIXME: Implement folding of GEP constant exprs the same as instcombine does
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if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
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// Implement folding of:
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// void ()** getelementptr (%struct..TorRec* getelementptr
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// ([N x %struct..TorRec]* %llvm.global_dtors, long 0, long 0),
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// long 0, ubyte 1)
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// Into:
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// %struct..TorRec* getelementptr ([N x %struct..TorRec]*
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// %llvm.global_dtors, long 0, long 0, ubyte 1)
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// Combine Indices - If the source pointer to this getelementptr instruction
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// is a getelementptr instruction, combine the indices of the two
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// getelementptr instructions into a single instruction.
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//
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if (CE->getOpcode() == Instruction::GetElementPtr)
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if (IdxList[0] == Constant::getNullValue(Type::LongTy)) {
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if (CE->getOpcode() == Instruction::GetElementPtr) {
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if (CE->getOperand(CE->getNumOperands()-1)->getType() == Type::LongTy) {
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std::vector<Constant*> NewIndices;
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NewIndices.reserve(IdxList.size() + CE->getNumOperands());
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for (unsigned i = 1, e = CE->getNumOperands(); i != e; ++i)
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for (unsigned i = 1, e = CE->getNumOperands()-1; i != e; ++i)
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NewIndices.push_back(cast<Constant>(CE->getOperand(i)));
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// Add the last index of the source with the first index of the new GEP.
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Constant *Combined =
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ConstantExpr::get(Instruction::Add, IdxList[0],
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CE->getOperand(CE->getNumOperands()-1));
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NewIndices.push_back(Combined);
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NewIndices.insert(NewIndices.end(), IdxList.begin()+1, IdxList.end());
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return ConstantExpr::getGetElementPtr(CE->getOperand(0), NewIndices);
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}
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}
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// Implement folding of:
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// int* getelementptr ([2 x int]* cast ([3 x int]* %X to [2 x int]*),
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