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op_iterator-ify some loops, low hanging fruit only, there is more

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llvm-svn: 52246
This commit is contained in:
Gabor Greif 2008-06-12 21:37:33 +00:00
parent 66ce588b87
commit 509b3a75f4
1 changed files with 21 additions and 19 deletions
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40
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -122,8 +122,8 @@ namespace {
/// the work lists because they might get more simplified now.
///
void AddUsesToWorkList(Instruction &I) {
for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
if (Instruction *Op = dyn_cast<Instruction>(I.getOperand(i)))
for (User::op_iterator i = I.op_begin(), e = I.op_end(); i != e; ++i)
if (Instruction *Op = dyn_cast<Instruction>(*i))
AddToWorkList(Op);
}
@ -136,11 +136,11 @@ namespace {
Value *AddSoonDeadInstToWorklist(Instruction &I, unsigned op) {
Value *R = I.getOperand(op);
for (unsigned i = 0, e = I.getNumOperands(); i != e; ++i)
if (Instruction *Op = dyn_cast<Instruction>(I.getOperand(i))) {
for (User::op_iterator i = I.op_begin(), e = I.op_end(); i != e; ++i)
if (Instruction *Op = dyn_cast<Instruction>(*i)) {
AddToWorkList(Op);
// Set the operand to undef to drop the use.
I.setOperand(i, UndefValue::get(Op->getType()));
*i = UndefValue::get(Op->getType());
}
return R;
@ -4585,8 +4585,9 @@ static Value *EmitGEPOffset(User *GEP, Instruction &I, InstCombiner &IC) {
unsigned IntPtrWidth = TD.getPointerSizeInBits();
uint64_t PtrSizeMask = ~0ULL >> (64-IntPtrWidth);
for (unsigned i = 1, e = GEP->getNumOperands(); i != e; ++i, ++GTI) {
Value *Op = GEP->getOperand(i);
for (User::op_iterator i = GEP->op_begin() + 1, e = GEP->op_end(); i != e;
++i, ++GTI) {
Value *Op = *i;
uint64_t Size = TD.getABITypeSize(GTI.getIndexedType()) & PtrSizeMask;
if (ConstantInt *OpC = dyn_cast<ConstantInt>(Op)) {
if (OpC->isZero()) continue;
@ -8286,9 +8287,9 @@ static unsigned EnforceKnownAlignment(Value *V,
case Instruction::GetElementPtr: {
// If all indexes are zero, it is just the alignment of the base pointer.
bool AllZeroOperands = true;
for (unsigned i = 1, e = U->getNumOperands(); i != e; ++i)
if (!isa<Constant>(U->getOperand(i)) ||
!cast<Constant>(U->getOperand(i))->isNullValue()) {
for (User::op_iterator i = U->op_begin(), e = U->op_end(); i != e; ++i)
if (!isa<Constant>(*i) ||
!cast<Constant>(*i)->isNullValue()) {
AllZeroOperands = false;
break;
}
@ -9536,9 +9537,10 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
bool MadeChange = false;
gep_type_iterator GTI = gep_type_begin(GEP);
for (unsigned i = 1, e = GEP.getNumOperands(); i != e; ++i, ++GTI) {
for (User::op_iterator i = GEP.op_begin() + 1, e = GEP.op_end();
i != e; ++i, ++GTI) {
if (isa<SequentialType>(*GTI)) {
if (CastInst *CI = dyn_cast<CastInst>(GEP.getOperand(i))) {
if (CastInst *CI = dyn_cast<CastInst>(*i)) {
if (CI->getOpcode() == Instruction::ZExt ||
CI->getOpcode() == Instruction::SExt) {
const Type *SrcTy = CI->getOperand(0)->getType();
@ -9546,7 +9548,7 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
// is a 32-bit pointer target.
if (SrcTy->getPrimitiveSizeInBits() >= TD->getPointerSizeInBits()) {
MadeChange = true;
GEP.setOperand(i, CI->getOperand(0));
*i = CI->getOperand(0);
}
}
}
@ -9554,15 +9556,15 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
// to what we need. If the incoming value needs a cast instruction,
// insert it. This explicit cast can make subsequent optimizations more
// obvious.
Value *Op = GEP.getOperand(i);
Value *Op = *i;
if (TD->getTypeSizeInBits(Op->getType()) > TD->getPointerSizeInBits()) {
if (Constant *C = dyn_cast<Constant>(Op)) {
GEP.setOperand(i, ConstantExpr::getTrunc(C, TD->getIntPtrType()));
*i = ConstantExpr::getTrunc(C, TD->getIntPtrType());
MadeChange = true;
} else {
Op = InsertCastBefore(Instruction::Trunc, Op, TD->getIntPtrType(),
GEP);
GEP.setOperand(i, Op);
*i = Op;
MadeChange = true;
}
}
@ -10717,11 +10719,11 @@ static std::vector<unsigned> getShuffleMask(const ShuffleVectorInst *SVI) {
std::vector<unsigned> Result;
const ConstantVector *CP = cast<ConstantVector>(SVI->getOperand(2));
for (unsigned i = 0, e = CP->getNumOperands(); i != e; ++i)
if (isa<UndefValue>(CP->getOperand(i)))
for (User::const_op_iterator i = CP->op_begin(), e = CP->op_end(); i!=e; ++i)
if (isa<UndefValue>(*i))
Result.push_back(NElts*2); // undef -> 8
else
Result.push_back(cast<ConstantInt>(CP->getOperand(i))->getZExtValue());
Result.push_back(cast<ConstantInt>(*i)->getZExtValue());
return Result;
}