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more cleanups: remove some redundant code, and simplify some

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other places.

llvm-svn: 80478
This commit is contained in:
Chris Lattner 2009-08-30 05:30:55 +00:00
parent aecf0100db
commit 741fcee014
1 changed files with 15 additions and 49 deletions
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64
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -10982,21 +10982,6 @@ Instruction *InstCombiner::visitPHINode(PHINode &PN) {
return 0;
}
static Value *InsertCastToIntPtrTy(Value *V, const Type *DTy,
Instruction *InsertPoint,
InstCombiner *IC) {
unsigned PtrSize = DTy->getScalarSizeInBits();
unsigned VTySize = V->getType()->getScalarSizeInBits();
// We must cast correctly to the pointer type. Ensure that we
// sign extend the integer value if it is smaller as this is
// used for address computation.
Instruction::CastOps opcode =
(VTySize < PtrSize ? Instruction::SExt :
(VTySize == PtrSize ? Instruction::BitCast : Instruction::Trunc));
return IC->InsertCastBefore(opcode, V, DTy, *InsertPoint);
}
Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
Value *PtrOp = GEP.getOperand(0);
// Is it 'getelementptr %P, i32 0' or 'getelementptr %P'
@ -11058,8 +11043,8 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
// Find out whether the last index in the source GEP is a sequential idx.
bool EndsWithSequential = false;
for (gep_type_iterator I = gep_type_begin(*cast<User>(PtrOp)),
E = gep_type_end(*cast<User>(PtrOp)); I != E; ++I)
for (gep_type_iterator I = gep_type_begin(*Src), E = gep_type_end(*Src);
I != E; ++I)
EndsWithSequential = !isa<StructType>(*I);
// Can we combine the two pointer arithmetics offsets?
@ -11075,28 +11060,12 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
} else if (GO1 == Constant::getNullValue(GO1->getType())) {
Sum = SO1;
} else {
// If they aren't the same type, convert both to an integer of the
// target's pointer size.
if (SO1->getType() != GO1->getType()) {
if (Constant *SO1C = dyn_cast<Constant>(SO1)) {
SO1 = ConstantExpr::getIntegerCast(SO1C, GO1->getType(), true);
} else if (Constant *GO1C = dyn_cast<Constant>(GO1)) {
GO1 = ConstantExpr::getIntegerCast(GO1C, SO1->getType(), true);
} else if (TD) {
unsigned PS = TD->getPointerSizeInBits();
if (TD->getTypeSizeInBits(SO1->getType()) == PS) {
// Convert GO1 to SO1's type.
GO1 = InsertCastToIntPtrTy(GO1, SO1->getType(), &GEP, this);
} else if (TD->getTypeSizeInBits(GO1->getType()) == PS) {
// Convert SO1 to GO1's type.
SO1 = InsertCastToIntPtrTy(SO1, GO1->getType(), &GEP, this);
} else {
const Type *PT = TD->getIntPtrType(GEP.getContext());
SO1 = InsertCastToIntPtrTy(SO1, PT, &GEP, this);
GO1 = InsertCastToIntPtrTy(GO1, PT, &GEP, this);
}
}
}
// If they aren't the same type, then the input hasn't been processed
// by the loop above yet (which canonicalizes sequential index types to
// intptr_t). Just avoid transforming this until the input has been
// normalized.
if (SO1->getType() != GO1->getType())
return 0;
if (isa<Constant>(SO1) && isa<Constant>(GO1))
Sum = ConstantExpr::getAdd(cast<Constant>(SO1), cast<Constant>(GO1));
else {
@ -11105,21 +11074,21 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
}
}
// Recycle the GEP we already have if possible.
// Update the GEP in place if possible.
if (Src->getNumOperands() == 2) {
GEP.setOperand(0, Src->getOperand(0));
GEP.setOperand(1, Sum);
return &GEP;
}
Indices.insert(Indices.end(), Src->op_begin()+1, Src->op_end()-1);
Indices.append(Src->op_begin()+1, Src->op_end()-1);
Indices.push_back(Sum);
Indices.insert(Indices.end(), GEP.op_begin()+2, GEP.op_end());
Indices.append(GEP.op_begin()+2, GEP.op_end());
} else if (isa<Constant>(*GEP.idx_begin()) &&
cast<Constant>(*GEP.idx_begin())->isNullValue() &&
Src->getNumOperands() != 1) {
// Otherwise we can do the fold if the first index of the GEP is a zero
Indices.insert(Indices.end(), Src->op_begin()+1, Src->op_end());
Indices.insert(Indices.end(), GEP.idx_begin()+1, GEP.idx_end());
Indices.append(Src->op_begin()+1, Src->op_end());
Indices.append(GEP.idx_begin()+1, GEP.idx_end());
}
if (!Indices.empty()) {
@ -11208,8 +11177,7 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
ConstantInt *Scale = 0;
if (ArrayEltSize == 1) {
NewIdx = GEP.getOperand(1);
Scale =
ConstantInt::get(cast<IntegerType>(NewIdx->getType()), 1);
Scale = ConstantInt::get(cast<IntegerType>(NewIdx->getType()), 1);
} else if (ConstantInt *CI = dyn_cast<ConstantInt>(GEP.getOperand(1))) {
NewIdx = ConstantInt::get(CI->getType(), 1);
Scale = CI;
@ -11237,9 +11205,7 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
Scale = ConstantInt::get(Scale->getType(),
Scale->getZExtValue() / ArrayEltSize);
if (Scale->getZExtValue() != 1) {
Constant *C =
ConstantExpr::getIntegerCast(Scale, NewIdx->getType(),
false /*ZExt*/);
Constant *C = ConstantExpr::getZExt(Scale, NewIdx->getType());
Instruction *Sc = BinaryOperator::CreateMul(NewIdx, C, "idxscale");
NewIdx = InsertNewInstBefore(Sc, GEP);
}