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eliminate the temporary SrcGEPOperands smallvector.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80477 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2009-08-30 05:08:50 +00:00
parent 6e24d83167
commit f9b91bb5ef
1 changed files with 15 additions and 18 deletions
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33
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -11045,18 +11045,14 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
// getelementptr instructions into a single instruction.
//
if (GEPOperator *Src = dyn_cast<GEPOperator>(PtrOp)) {
SmallVector<Value*, 8> SrcGEPOperands;
SrcGEPOperands.append(Src->op_begin(), Src->op_end());
// Note that if our source is a gep chain itself that we wait for that
// chain to be resolved before we perform this transformation. This
// avoids us creating a TON of code in some cases.
//
if (SrcGEPOperands.empty() ||
(isa<GetElementPtrInst>(SrcGEPOperands[0]) &&
cast<Instruction>(SrcGEPOperands[0])->getNumOperands() == 2))
return 0; // Wait until our source is folded to completion.
if (GetElementPtrInst *SrcGEP =
dyn_cast<GetElementPtrInst>(Src->getOperand(0)))
if (SrcGEP->getNumOperands() == 2)
return 0; // Wait until our source is folded to completion.
SmallVector<Value*, 8> Indices;
@ -11071,7 +11067,9 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
// Replace: gep (gep %P, long B), long A, ...
// With: T = long A+B; gep %P, T, ...
//
Value *Sum, *SO1 = SrcGEPOperands.back(), *GO1 = GEP.getOperand(1);
Value *Sum;
Value *SO1 = Src->getOperand(Src->getNumOperands()-1);
Value *GO1 = GEP.getOperand(1);
if (SO1 == Constant::getNullValue(SO1->getType())) {
Sum = GO1;
} else if (GO1 == Constant::getNullValue(GO1->getType())) {
@ -11108,27 +11106,25 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
}
// Recycle the GEP we already have if possible.
if (SrcGEPOperands.size() == 2) {
GEP.setOperand(0, SrcGEPOperands[0]);
if (Src->getNumOperands() == 2) {
GEP.setOperand(0, Src->getOperand(0));
GEP.setOperand(1, Sum);
return &GEP;
}
Indices.insert(Indices.end(), SrcGEPOperands.begin()+1,
SrcGEPOperands.end()-1);
Indices.insert(Indices.end(), Src->op_begin()+1, Src->op_end()-1);
Indices.push_back(Sum);
Indices.insert(Indices.end(), GEP.op_begin()+2, GEP.op_end());
} else if (isa<Constant>(*GEP.idx_begin()) &&
cast<Constant>(*GEP.idx_begin())->isNullValue() &&
SrcGEPOperands.size() != 1) {
Src->getNumOperands() != 1) {
// Otherwise we can do the fold if the first index of the GEP is a zero
Indices.insert(Indices.end(), SrcGEPOperands.begin()+1,
SrcGEPOperands.end());
Indices.insert(Indices.end(), Src->op_begin()+1, Src->op_end());
Indices.insert(Indices.end(), GEP.idx_begin()+1, GEP.idx_end());
}
if (!Indices.empty()) {
GetElementPtrInst *NewGEP =
GetElementPtrInst::Create(SrcGEPOperands[0], Indices.begin(),
GetElementPtrInst::Create(Src->getOperand(0), Indices.begin(),
Indices.end(), GEP.getName());
if (cast<GEPOperator>(&GEP)->isInBounds() && Src->isInBounds())
cast<GEPOperator>(NewGEP)->setIsInBounds(true);
@ -11136,7 +11132,8 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
}
}
if (Value *X = getBitCastOperand(PtrOp)) { // Is the operand a cast?
// Handle gep(bitcast x) and gep(gep x, 0, 0, 0).
if (Value *X = getBitCastOperand(PtrOp)) {
assert(isa<PointerType>(X->getType()) && "Must be cast from pointer");
if (HasZeroPointerIndex) {