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Revert 98755, which may be causing trouble. 

llvm-svn: 98762
This commit is contained in:
Dan Gohman 2010-03-17 19:54:53 +00:00
parent 6221720599
commit d2abecaeea
3 changed files with 58 additions and 61 deletions
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50
llvm/include/llvm/Analysis/ScalarEvolutionExpressions.h
View File

@ -180,27 +180,25 @@ namespace llvm {
///
class SCEVNAryExpr : public SCEV {
protected:
// Since SCEVs are immutable, ScalarEvolution allocates operand
// arrays with its SCEVAllocator, so this class just needs a simple
// pointer rather than a more elaborate vector-like data structure.
// This also avoids the need for a non-trivial destructor.
const SCEV *const *Operands;
size_t NumOperands;
SmallVector<const SCEV *, 8> Operands;
SCEVNAryExpr(const FoldingSetNodeID &ID,
enum SCEVTypes T, const SCEV *const *O, size_t N)
: SCEV(ID, T), Operands(O), NumOperands(N) {}
enum SCEVTypes T, const SmallVectorImpl<const SCEV *> &ops)
: SCEV(ID, T), Operands(ops.begin(), ops.end()) {}
public:
size_t getNumOperands() const { return NumOperands; }
unsigned getNumOperands() const { return (unsigned)Operands.size(); }
const SCEV *getOperand(unsigned i) const {
assert(i < NumOperands && "Operand index out of range!");
assert(i < Operands.size() && "Operand index out of range!");
return Operands[i];
}
typedef const SCEV *const *op_iterator;
op_iterator op_begin() const { return Operands; }
op_iterator op_end() const { return Operands + NumOperands; }
const SmallVectorImpl<const SCEV *> &getOperands() const {
return Operands;
}
typedef SmallVectorImpl<const SCEV *>::const_iterator op_iterator;
op_iterator op_begin() const { return Operands.begin(); }
op_iterator op_end() const { return Operands.end(); }
virtual bool isLoopInvariant(const Loop *L) const {
for (unsigned i = 0, e = getNumOperands(); i != e; ++i)
@ -264,8 +262,8 @@ namespace llvm {
protected:
SCEVCommutativeExpr(const FoldingSetNodeID &ID,
enum SCEVTypes T,
const SCEV *const *O, size_t N)
: SCEVNAryExpr(ID, T, O, N) {}
const SmallVectorImpl<const SCEV *> &ops)
: SCEVNAryExpr(ID, T, ops) {}
public:
virtual const char *getOperationStr() const = 0;
@ -290,8 +288,8 @@ namespace llvm {
friend class ScalarEvolution;
SCEVAddExpr(const FoldingSetNodeID &ID,
const SCEV *const *O, size_t N)
: SCEVCommutativeExpr(ID, scAddExpr, O, N) {
const SmallVectorImpl<const SCEV *> &ops)
: SCEVCommutativeExpr(ID, scAddExpr, ops) {
}
public:
@ -318,8 +316,8 @@ namespace llvm {
friend class ScalarEvolution;
SCEVMulExpr(const FoldingSetNodeID &ID,
const SCEV *const *O, size_t N)
: SCEVCommutativeExpr(ID, scMulExpr, O, N) {
const SmallVectorImpl<const SCEV *> &ops)
: SCEVCommutativeExpr(ID, scMulExpr, ops) {
}
public:
@ -392,9 +390,9 @@ namespace llvm {
const Loop *L;
SCEVAddRecExpr(const FoldingSetNodeID &ID,
const SCEV *const *O, size_t N, const Loop *l)
: SCEVNAryExpr(ID, scAddRecExpr, O, N), L(l) {
for (size_t i = 0, e = NumOperands; i != e; ++i)
const SmallVectorImpl<const SCEV *> &ops, const Loop *l)
: SCEVNAryExpr(ID, scAddRecExpr, ops), L(l) {
for (size_t i = 0, e = Operands.size(); i != e; ++i)
assert(Operands[i]->isLoopInvariant(l) &&
"Operands of AddRec must be loop-invariant!");
}
@ -474,8 +472,8 @@ namespace llvm {
friend class ScalarEvolution;
SCEVSMaxExpr(const FoldingSetNodeID &ID,
const SCEV *const *O, size_t N)
: SCEVCommutativeExpr(ID, scSMaxExpr, O, N) {
const SmallVectorImpl<const SCEV *> &ops)
: SCEVCommutativeExpr(ID, scSMaxExpr, ops) {
// Max never overflows.
setHasNoUnsignedWrap(true);
setHasNoSignedWrap(true);
@ -499,8 +497,8 @@ namespace llvm {
friend class ScalarEvolution;
SCEVUMaxExpr(const FoldingSetNodeID &ID,
const SCEV *const *O, size_t N)
: SCEVCommutativeExpr(ID, scUMaxExpr, O, N) {
const SmallVectorImpl<const SCEV *> &ops)
: SCEVCommutativeExpr(ID, scUMaxExpr, ops) {
// Max never overflows.
setHasNoUnsignedWrap(true);
setHasNoSignedWrap(true);

41
llvm/lib/Analysis/ScalarEvolution.cpp
View File

@ -248,10 +248,10 @@ void SCEVSignExtendExpr::print(raw_ostream &OS) const {
}
void SCEVCommutativeExpr::print(raw_ostream &OS) const {
assert(NumOperands > 1 && "This plus expr shouldn't exist!");
assert(Operands.size() > 1 && "This plus expr shouldn't exist!");
const char *OpStr = getOperationStr();
OS << "(" << *Operands[0];
for (unsigned i = 1, e = NumOperands; i != e; ++i)
for (unsigned i = 1, e = Operands.size(); i != e; ++i)
OS << OpStr << *Operands[i];
OS << ")";
}
@ -329,7 +329,7 @@ SCEVAddRecExpr::properlyDominates(BasicBlock *BB, DominatorTree *DT) const {
void SCEVAddRecExpr::print(raw_ostream &OS) const {
OS << "{" << *Operands[0];
for (unsigned i = 1, e = NumOperands; i != e; ++i)
for (unsigned i = 1, e = Operands.size(); i != e; ++i)
OS << ",+," << *Operands[i];
OS << "}<";
WriteAsOperand(OS, L->getHeader(), /*PrintType=*/false);
@ -1202,23 +1202,23 @@ static bool
CollectAddOperandsWithScales(DenseMap<const SCEV *, APInt> &M,
SmallVector<const SCEV *, 8> &NewOps,
APInt &AccumulatedConstant,
const SCEV *const *Ops, size_t NumOperands,
const SmallVectorImpl<const SCEV *> &Ops,
const APInt &Scale,
ScalarEvolution &SE) {
bool Interesting = false;
// Iterate over the add operands.
for (unsigned i = 0, e = NumOperands; i != e; ++i) {
for (unsigned i = 0, e = Ops.size(); i != e; ++i) {
const SCEVMulExpr *Mul = dyn_cast<SCEVMulExpr>(Ops[i]);
if (Mul && isa<SCEVConstant>(Mul->getOperand(0))) {
APInt NewScale =
Scale * cast<SCEVConstant>(Mul->getOperand(0))->getValue()->getValue();
if (Mul->getNumOperands() == 2 && isa<SCEVAddExpr>(Mul->getOperand(1))) {
// A multiplication of a constant with another add; recurse.
const SCEVAddExpr *Add = cast<SCEVAddExpr>(Mul->getOperand(1));
Interesting |=
CollectAddOperandsWithScales(M, NewOps, AccumulatedConstant,
Add->op_begin(), Add->getNumOperands(),
cast<SCEVAddExpr>(Mul->getOperand(1))
->getOperands(),
NewScale, SE);
} else {
// A multiplication of a constant with some other value. Update
@ -1427,8 +1427,7 @@ const SCEV *ScalarEvolution::getAddExpr(SmallVectorImpl<const SCEV *> &Ops,
SmallVector<const SCEV *, 8> NewOps;
APInt AccumulatedConstant(BitWidth, 0);
if (CollectAddOperandsWithScales(M, NewOps, AccumulatedConstant,
Ops.data(), Ops.size(),
APInt(BitWidth, 1), *this)) {
Ops, APInt(BitWidth, 1), *this)) {
// Some interesting folding opportunity is present, so its worthwhile to
// re-generate the operands list. Group the operands by constant scale,
// to avoid multiplying by the same constant scale multiple times.
@ -1613,9 +1612,7 @@ const SCEV *ScalarEvolution::getAddExpr(SmallVectorImpl<const SCEV *> &Ops,
static_cast<SCEVAddExpr *>(UniqueSCEVs.FindNodeOrInsertPos(ID, IP));
if (!S) {
S = SCEVAllocator.Allocate<SCEVAddExpr>();
const SCEV **O = SCEVAllocator.Allocate<const SCEV *>(Ops.size());
std::uninitialized_copy(Ops.begin(), Ops.end(), O);
new (S) SCEVAddExpr(ID, O, Ops.size());
new (S) SCEVAddExpr(ID, Ops);
UniqueSCEVs.InsertNode(S, IP);
}
if (HasNUW) S->setHasNoUnsignedWrap(true);
@ -1823,9 +1820,7 @@ const SCEV *ScalarEvolution::getMulExpr(SmallVectorImpl<const SCEV *> &Ops,
static_cast<SCEVMulExpr *>(UniqueSCEVs.FindNodeOrInsertPos(ID, IP));
if (!S) {
S = SCEVAllocator.Allocate<SCEVMulExpr>();
const SCEV **O = SCEVAllocator.Allocate<const SCEV *>(Ops.size());
std::uninitialized_copy(Ops.begin(), Ops.end(), O);
new (S) SCEVMulExpr(ID, O, Ops.size());
new (S) SCEVMulExpr(ID, Ops);
UniqueSCEVs.InsertNode(S, IP);
}
if (HasNUW) S->setHasNoUnsignedWrap(true);
@ -1885,7 +1880,9 @@ const SCEV *ScalarEvolution::getUDivExpr(const SCEV *LHS,
const SCEV *Op = M->getOperand(i);
const SCEV *Div = getUDivExpr(Op, RHSC);
if (!isa<SCEVUDivExpr>(Div) && getMulExpr(Div, RHSC) == Op) {
Operands = SmallVector<const SCEV *, 4>(M->op_begin(), M->op_end());
const SmallVectorImpl<const SCEV *> &MOperands = M->getOperands();
Operands = SmallVector<const SCEV *, 4>(MOperands.begin(),
MOperands.end());
Operands[i] = Div;
return getMulExpr(Operands);
}
@ -2034,9 +2031,7 @@ ScalarEvolution::getAddRecExpr(SmallVectorImpl<const SCEV *> &Operands,
static_cast<SCEVAddRecExpr *>(UniqueSCEVs.FindNodeOrInsertPos(ID, IP));
if (!S) {
S = SCEVAllocator.Allocate<SCEVAddRecExpr>();
const SCEV **O = SCEVAllocator.Allocate<const SCEV *>(Operands.size());
std::uninitialized_copy(Operands.begin(), Operands.end(), O);
new (S) SCEVAddRecExpr(ID, O, Operands.size(), L);
new (S) SCEVAddRecExpr(ID, Operands, L);
UniqueSCEVs.InsertNode(S, IP);
}
if (HasNUW) S->setHasNoUnsignedWrap(true);
@ -2136,9 +2131,7 @@ ScalarEvolution::getSMaxExpr(SmallVectorImpl<const SCEV *> &Ops) {
void *IP = 0;
if (const SCEV *S = UniqueSCEVs.FindNodeOrInsertPos(ID, IP)) return S;
SCEV *S = SCEVAllocator.Allocate<SCEVSMaxExpr>();
const SCEV **O = SCEVAllocator.Allocate<const SCEV *>(Ops.size());
std::uninitialized_copy(Ops.begin(), Ops.end(), O);
new (S) SCEVSMaxExpr(ID, O, Ops.size());
new (S) SCEVSMaxExpr(ID, Ops);
UniqueSCEVs.InsertNode(S, IP);
return S;
}
@ -2235,9 +2228,7 @@ ScalarEvolution::getUMaxExpr(SmallVectorImpl<const SCEV *> &Ops) {
void *IP = 0;
if (const SCEV *S = UniqueSCEVs.FindNodeOrInsertPos(ID, IP)) return S;
SCEV *S = SCEVAllocator.Allocate<SCEVUMaxExpr>();
const SCEV **O = SCEVAllocator.Allocate<const SCEV *>(Ops.size());
std::uninitialized_copy(Ops.begin(), Ops.end(), O);
new (S) SCEVUMaxExpr(ID, O, Ops.size());
new (S) SCEVUMaxExpr(ID, Ops);
UniqueSCEVs.InsertNode(S, IP);
return S;
}

28
llvm/lib/Analysis/ScalarEvolutionExpander.cpp
View File

@ -232,7 +232,9 @@ static bool FactorOutConstant(const SCEV *&S,
const SCEVConstant *FC = cast<SCEVConstant>(Factor);
if (const SCEVConstant *C = dyn_cast<SCEVConstant>(M->getOperand(0)))
if (!C->getValue()->getValue().srem(FC->getValue()->getValue())) {
SmallVector<const SCEV *, 4> NewMulOps(M->op_begin(), M->op_end());
const SmallVectorImpl<const SCEV *> &MOperands = M->getOperands();
SmallVector<const SCEV *, 4> NewMulOps(MOperands.begin(),
MOperands.end());
NewMulOps[0] =
SE.getConstant(C->getValue()->getValue().sdiv(
FC->getValue()->getValue()));
@ -247,7 +249,9 @@ static bool FactorOutConstant(const SCEV *&S,
const SCEV *Remainder = SE.getIntegerSCEV(0, SOp->getType());
if (FactorOutConstant(SOp, Remainder, Factor, SE, TD) &&
Remainder->isZero()) {
SmallVector<const SCEV *, 4> NewMulOps(M->op_begin(), M->op_end());
const SmallVectorImpl<const SCEV *> &MOperands = M->getOperands();
SmallVector<const SCEV *, 4> NewMulOps(MOperands.begin(),
MOperands.end());
NewMulOps[i] = SOp;
S = SE.getMulExpr(NewMulOps);
return true;
@ -293,11 +297,13 @@ static void SimplifyAddOperands(SmallVectorImpl<const SCEV *> &Ops,
SE.getAddExpr(NoAddRecs);
// If it returned an add, use the operands. Otherwise it simplified
// the sum into a single value, so just use that.
Ops.clear();
if (const SCEVAddExpr *Add = dyn_cast<SCEVAddExpr>(Sum))
Ops.insert(Ops.end(), Add->op_begin(), Add->op_begin());
else if (!Sum->isZero())
Ops.push_back(Sum);
Ops = Add->getOperands();
else {
Ops.clear();
if (!Sum->isZero())
Ops.push_back(Sum);
}
// Then append the addrecs.
Ops.insert(Ops.end(), AddRecs.begin(), AddRecs.end());
}
@ -1054,9 +1060,10 @@ Value *SCEVExpander::visitAddRecExpr(const SCEVAddRecExpr *S) {
if (CanonicalIV &&
SE.getTypeSizeInBits(CanonicalIV->getType()) >
SE.getTypeSizeInBits(Ty)) {
SmallVector<const SCEV *, 4> NewOps(S->getNumOperands());
for (unsigned i = 0, e = S->getNumOperands(); i != e; ++i)
NewOps[i] = SE.getAnyExtendExpr(S->op_begin()[i], CanonicalIV->getType());
const SmallVectorImpl<const SCEV *> &Ops = S->getOperands();
SmallVector<const SCEV *, 4> NewOps(Ops.size());
for (unsigned i = 0, e = Ops.size(); i != e; ++i)
NewOps[i] = SE.getAnyExtendExpr(Ops[i], CanonicalIV->getType());
Value *V = expand(SE.getAddRecExpr(NewOps, S->getLoop()));
BasicBlock *SaveInsertBB = Builder.GetInsertBlock();
BasicBlock::iterator SaveInsertPt = Builder.GetInsertPoint();
@ -1071,7 +1078,8 @@ Value *SCEVExpander::visitAddRecExpr(const SCEVAddRecExpr *S) {
// {X,+,F} --> X + {0,+,F}
if (!S->getStart()->isZero()) {
SmallVector<const SCEV *, 4> NewOps(S->op_begin(), S->op_end());
const SmallVectorImpl<const SCEV *> &SOperands = S->getOperands();
SmallVector<const SCEV *, 4> NewOps(SOperands.begin(), SOperands.end());
NewOps[0] = SE.getIntegerSCEV(0, Ty);
const SCEV *Rest = SE.getAddRecExpr(NewOps, L);