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Implement %test7 in InstCombine/getelementptr.ll

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5704 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2003-03-05 22:33:14 +00:00
parent 4872eaf189
commit decd0812ec
1 changed files with 21 additions and 7 deletions
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28
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -807,14 +807,28 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
std::vector<Value *> Indices;
// Can we combine the two pointer arithmetics offsets?
if (Src->getNumOperands() == 2 && isa<Constant>(Src->getOperand(1)) &&
isa<Constant>(GEP.getOperand(1))) {
// Replace the index list on this GEP with the index on the getelementptr
Indices.insert(Indices.end(), GEP.idx_begin(), GEP.idx_end());
Indices[0] = *cast<Constant>(Src->getOperand(1)) +
if (Src->getNumOperands() == 2 && isa<Constant>(Src->getOperand(1)) &&
isa<Constant>(GEP.getOperand(1))) {
// Replace: gep (gep %P, long C1), long C2, ...
// With: gep %P, long (C1+C2), ...
Value *Sum = *cast<Constant>(Src->getOperand(1)) +
*cast<Constant>(GEP.getOperand(1));
assert(Indices[0] != 0 && "Constant folding of uint's failed!?");
assert(Sum && "Constant folding of longs failed!?");
GEP.setOperand(0, Src->getOperand(0));
GEP.setOperand(1, Sum);
AddUsesToWorkList(*Src); // Reduce use count of Src
return &GEP;
} else if (Src->getNumOperands() == 2 && Src->use_size() == 1) {
// Replace: gep (gep %P, long B), long A, ...
// With: T = long A+B; gep %P, T, ...
//
Value *Sum = BinaryOperator::create(Instruction::Add, Src->getOperand(1),
GEP.getOperand(1),
Src->getName()+".sum", &GEP);
GEP.setOperand(0, Src->getOperand(0));
GEP.setOperand(1, Sum);
WorkList.push_back(cast<Instruction>(Sum));
return &GEP;
} else if (*GEP.idx_begin() == Constant::getNullValue(Type::LongTy) &&
Src->getNumOperands() != 1) {
// Otherwise we can do the fold if the first index of the GEP is a zero