cl::init(100));
namespace {
+ const int ScalarEvolution::ID = 0;
RegisterPass<ScalarEvolution>
R("scalar-evolution", "Scalar Evolution Analysis");
}
const Type *Ty = getType();
assert(Ty->isInteger() && "Can't get range for a non-integer SCEV!");
// Default to a full range if no better information is available.
- return ConstantRange(getType());
+ return ConstantRange(getBitWidth());
+}
+
+uint32_t SCEV::getBitWidth() const {
+ if (const IntegerType* ITy = dyn_cast<IntegerType>(getType()))
+ return ITy->getBitWidth();
+ return 0;
}
}
ConstantRange SCEVConstant::getValueRange() const {
- return ConstantRange(V);
+ return ConstantRange(V->getValue());
}
const Type *SCEVConstant::getType() const { return V->getType(); }
}
ConstantRange SCEVTruncateExpr::getValueRange() const {
- return getOperand()->getValueRange().truncate(getType());
+ return getOperand()->getValueRange().truncate(getBitWidth());
}
void SCEVTruncateExpr::print(std::ostream &OS) const {
}
ConstantRange SCEVZeroExtendExpr::getValueRange() const {
- return getOperand()->getValueRange().zeroExtend(getType());
+ return getOperand()->getValueRange().zeroExtend(getBitWidth());
}
void SCEVZeroExtendExpr::print(std::ostream &OS) const {
return SCEVUnknown::get(C);
}
+SCEVHandle SCEVUnknown::getIntegerSCEV(const APInt& Val) {
+ return SCEVUnknown::get(ConstantInt::get(Val));
+}
+
/// getTruncateOrZeroExtend - Return a SCEV corresponding to a conversion of the
/// input value to the specified type. If the type must be extended, it is zero
/// extended.
// Handle this case efficiently, it is common to have constant iteration
// counts while computing loop exit values.
if (SCEVConstant *SC = dyn_cast<SCEVConstant>(V)) {
- uint64_t Val = SC->getValue()->getZExtValue();
- uint64_t Result = 1;
+ const APInt& Val = SC->getValue()->getValue();
+ APInt Result(Val.getBitWidth(), 1);
for (; NumSteps; --NumSteps)
Result *= Val-(NumSteps-1);
- Constant *Res = ConstantInt::get(Type::Int64Ty, Result);
- return SCEVUnknown::get(ConstantExpr::getTruncOrBitCast(Res, V->getType()));
+ return SCEVUnknown::get(ConstantInt::get(Result));
}
const Type *Ty = V->getType();
assert(Idx < Ops.size());
while (SCEVConstant *RHSC = dyn_cast<SCEVConstant>(Ops[Idx])) {
// We found two constants, fold them together!
- Constant *Fold = ConstantExpr::getAdd(LHSC->getValue(), RHSC->getValue());
+ Constant *Fold = ConstantInt::get(LHSC->getValue()->getValue() +
+ RHSC->getValue()->getValue());
if (ConstantInt *CI = dyn_cast<ConstantInt>(Fold)) {
Ops[0] = SCEVConstant::get(CI);
Ops.erase(Ops.begin()+1); // Erase the folded element
}
// If we are left with a constant zero being added, strip it off.
- if (cast<SCEVConstant>(Ops[0])->getValue()->isNullValue()) {
+ if (cast<SCEVConstant>(Ops[0])->getValue()->isZero()) {
Ops.erase(Ops.begin());
--Idx;
}
++Idx;
while (SCEVConstant *RHSC = dyn_cast<SCEVConstant>(Ops[Idx])) {
// We found two constants, fold them together!
- Constant *Fold = ConstantExpr::getMul(LHSC->getValue(), RHSC->getValue());
+ Constant *Fold = ConstantInt::get(LHSC->getValue()->getValue() *
+ RHSC->getValue()->getValue());
if (ConstantInt *CI = dyn_cast<ConstantInt>(Fold)) {
Ops[0] = SCEVConstant::get(CI);
Ops.erase(Ops.begin()+1); // Erase the folded element
if (cast<SCEVConstant>(Ops[0])->getValue()->equalsInt(1)) {
Ops.erase(Ops.begin());
--Idx;
- } else if (cast<SCEVConstant>(Ops[0])->getValue()->isNullValue()) {
+ } else if (cast<SCEVConstant>(Ops[0])->getValue()->isZero()) {
// If we have a multiply of zero, it will always be zero.
return Ops[0];
}
if (Operands.size() == 1) return Operands[0];
if (SCEVConstant *StepC = dyn_cast<SCEVConstant>(Operands.back()))
- if (StepC->getValue()->isNullValue()) {
+ if (StepC->getValue()->isZero()) {
Operands.pop_back();
return get(Operands, L); // { X,+,0 } --> X
}
SCEVHandle ComputeIterationCount(const Loop *L);
/// ComputeLoadConstantCompareIterationCount - Given an exit condition of
- /// 'setcc load X, cst', try to se if we can compute the trip count.
+ /// 'setcc load X, cst', try to see if we can compute the trip count.
SCEVHandle ComputeLoadConstantCompareIterationCount(LoadInst *LI,
Constant *RHS,
const Loop *L,
/// in the header of its containing loop, we know the loop executes a
/// constant number of times, and the PHI node is just a recurrence
/// involving constants, fold it.
- Constant *getConstantEvolutionLoopExitValue(PHINode *PN, uint64_t Its,
+ Constant *getConstantEvolutionLoopExitValue(PHINode *PN, const APInt& Its,
const Loop *L);
};
}
/// GetConstantFactor - Determine the largest constant factor that S has. For
/// example, turn {4,+,8} -> 4. (S umod result) should always equal zero.
-static uint64_t GetConstantFactor(SCEVHandle S) {
+static APInt GetConstantFactor(SCEVHandle S) {
if (SCEVConstant *C = dyn_cast<SCEVConstant>(S)) {
- if (uint64_t V = C->getValue()->getZExtValue())
+ const APInt& V = C->getValue()->getValue();
+ if (!V.isMinValue())
return V;
else // Zero is a multiple of everything.
- return 1ULL << (S->getType()->getPrimitiveSizeInBits()-1);
+ return APInt(C->getBitWidth(), 1).shl(C->getBitWidth()-1);
}
- if (SCEVTruncateExpr *T = dyn_cast<SCEVTruncateExpr>(S))
- return GetConstantFactor(T->getOperand()) &
- T->getType()->getIntegerTypeMask();
+ if (SCEVTruncateExpr *T = dyn_cast<SCEVTruncateExpr>(S)) {
+ return GetConstantFactor(T->getOperand()).trunc(
+ cast<IntegerType>(T->getType())->getBitWidth());
+ }
if (SCEVZeroExtendExpr *E = dyn_cast<SCEVZeroExtendExpr>(S))
- return GetConstantFactor(E->getOperand());
+ return GetConstantFactor(E->getOperand()).zext(
+ cast<IntegerType>(E->getType())->getBitWidth());
if (SCEVAddExpr *A = dyn_cast<SCEVAddExpr>(S)) {
// The result is the min of all operands.
- uint64_t Res = GetConstantFactor(A->getOperand(0));
- for (unsigned i = 1, e = A->getNumOperands(); i != e && Res > 1; ++i)
- Res = std::min(Res, GetConstantFactor(A->getOperand(i)));
+ APInt Res(GetConstantFactor(A->getOperand(0)));
+ for (unsigned i = 1, e = A->getNumOperands();
+ i != e && Res.ugt(APInt(Res.getBitWidth(),1)); ++i) {
+ APInt Tmp(GetConstantFactor(A->getOperand(i)));
+ Res = APIntOps::umin(Res, Tmp);
+ }
return Res;
}
if (SCEVMulExpr *M = dyn_cast<SCEVMulExpr>(S)) {
// The result is the product of all the operands.
- uint64_t Res = GetConstantFactor(M->getOperand(0));
- for (unsigned i = 1, e = M->getNumOperands(); i != e; ++i)
- Res *= GetConstantFactor(M->getOperand(i));
+ APInt Res(GetConstantFactor(M->getOperand(0)));
+ for (unsigned i = 1, e = M->getNumOperands(); i != e; ++i) {
+ APInt Tmp(GetConstantFactor(M->getOperand(i)));
+ Res *= Tmp;
+ }
return Res;
}
// For now, we just handle linear expressions.
if (A->getNumOperands() == 2) {
// We want the GCD between the start and the stride value.
- uint64_t Start = GetConstantFactor(A->getOperand(0));
- if (Start == 1) return 1;
- uint64_t Stride = GetConstantFactor(A->getOperand(1));
- return GreatestCommonDivisor64(Start, Stride);
+ APInt Start(GetConstantFactor(A->getOperand(0)));
+ if (Start == 1)
+ return Start;
+ APInt Stride(GetConstantFactor(A->getOperand(1)));
+ return APIntOps::GreatestCommonDivisor(Start, Stride);
}
}
// SCEVSDivExpr, SCEVUnknown.
- return 1;
+ return APInt(S->getBitWidth(), 1);
}
/// createSCEV - We know that there is no SCEV for the specified value.
// optimizations will transparently handle this case.
if (ConstantInt *CI = dyn_cast<ConstantInt>(I->getOperand(1))) {
SCEVHandle LHS = getSCEV(I->getOperand(0));
- uint64_t CommonFact = GetConstantFactor(LHS);
- assert(CommonFact && "Common factor should at least be 1!");
- if (CommonFact > CI->getZExtValue()) {
+ APInt CommonFact(GetConstantFactor(LHS));
+ assert(!CommonFact.isMinValue() &&
+ "Common factor should at least be 1!");
+ if (CommonFact.ugt(CI->getValue())) {
// If the LHS is a multiple that is larger than the RHS, use +.
return SCEVAddExpr::get(LHS,
getSCEV(I->getOperand(1)));
}
}
break;
-
+ case Instruction::Xor:
+ // If the RHS of the xor is a signbit, then this is just an add.
+ // Instcombine turns add of signbit into xor as a strength reduction step.
+ if (ConstantInt *CI = dyn_cast<ConstantInt>(I->getOperand(1))) {
+ if (CI->getValue().isSignBit())
+ return SCEVAddExpr::get(getSCEV(I->getOperand(0)),
+ getSCEV(I->getOperand(1)));
+ }
+ break;
+
case Instruction::Shl:
// Turn shift left of a constant amount into a multiply.
if (ConstantInt *SA = dyn_cast<ConstantInt>(I->getOperand(1))) {
- Constant *X = ConstantInt::get(V->getType(), 1);
- X = ConstantExpr::getShl(X, SA);
+ uint32_t BitWidth = cast<IntegerType>(V->getType())->getBitWidth();
+ Constant *X = ConstantInt::get(
+ APInt(BitWidth, 1).shl(SA->getLimitedValue(BitWidth)));
return SCEVMulExpr::get(getSCEV(I->getOperand(0)), getSCEV(X));
}
break;
ConstantExpr::getBitCast(CompVal, RealTy));
if (CompVal) {
// Form the constant range.
- ConstantRange CompRange(Cond, CompVal);
+ ConstantRange CompRange(
+ ICmpInst::makeConstantRange(Cond, CompVal->getValue()));
SCEVHandle Ret = AddRec->getNumIterationsInRange(CompRange,
false /*Always treat as unsigned range*/);
// Evaluate the condition for this iteration.
Result = ConstantExpr::getICmp(predicate, Result, RHS);
if (!isa<ConstantInt>(Result)) break; // Couldn't decide for sure
- if (cast<ConstantInt>(Result)->getZExtValue() == false) {
+ if (cast<ConstantInt>(Result)->getValue().isMinValue()) {
#if 0
cerr << "\n***\n*** Computed loop count " << *ItCst
<< "\n*** From global " << *GV << "*** BB: " << *L->getHeader()
/// CanConstantFold - Return true if we can constant fold an instruction of the
/// specified type, assuming that all operands were constants.
static bool CanConstantFold(const Instruction *I) {
- if (isa<BinaryOperator>(I) || isa<ShiftInst>(I) || isa<CmpInst>(I) ||
+ if (isa<BinaryOperator>(I) || isa<CmpInst>(I) ||
isa<SelectInst>(I) || isa<CastInst>(I) || isa<GetElementPtrInst>(I))
return true;
return false;
}
-/// ConstantFold - Constant fold an instruction of the specified type with the
-/// specified constant operands. This function may modify the operands vector.
-static Constant *ConstantFold(const Instruction *I,
- std::vector<Constant*> &Operands) {
- if (isa<BinaryOperator>(I) || isa<ShiftInst>(I))
- return ConstantExpr::get(I->getOpcode(), Operands[0], Operands[1]);
-
- if (isa<CastInst>(I))
- return ConstantExpr::getCast(I->getOpcode(), Operands[0], I->getType());
-
- switch (I->getOpcode()) {
- case Instruction::Select:
- return ConstantExpr::getSelect(Operands[0], Operands[1], Operands[2]);
- case Instruction::Call:
- if (Function *GV = dyn_cast<Function>(Operands[0])) {
- Operands.erase(Operands.begin());
- return ConstantFoldCall(cast<Function>(GV), Operands);
- }
- return 0;
- case Instruction::GetElementPtr: {
- Constant *Base = Operands[0];
- Operands.erase(Operands.begin());
- return ConstantExpr::getGetElementPtr(Base, Operands);
- }
- case Instruction::ICmp:
- return ConstantExpr::getICmp(
- cast<ICmpInst>(I)->getPredicate(), Operands[0], Operands[1]);
- case Instruction::FCmp:
- return ConstantExpr::getFCmp(
- cast<FCmpInst>(I)->getPredicate(), Operands[0], Operands[1]);
- }
- return 0;
-}
-
-
/// getConstantEvolvingPHI - Given an LLVM value and a loop, return a PHI node
/// in the loop that V is derived from. We allow arbitrary operations along the
/// way, but the operands of an operation must either be constants or a value
if (Operands[i] == 0) return 0;
}
- return ConstantFold(I, Operands);
+ return ConstantFoldInstOperands(I, &Operands[0], Operands.size());
}
/// getConstantEvolutionLoopExitValue - If we know that the specified Phi is
/// constant number of times, and the PHI node is just a recurrence
/// involving constants, fold it.
Constant *ScalarEvolutionsImpl::
-getConstantEvolutionLoopExitValue(PHINode *PN, uint64_t Its, const Loop *L) {
+getConstantEvolutionLoopExitValue(PHINode *PN, const APInt& Its, const Loop *L){
std::map<PHINode*, Constant*>::iterator I =
ConstantEvolutionLoopExitValue.find(PN);
if (I != ConstantEvolutionLoopExitValue.end())
return I->second;
- if (Its > MaxBruteForceIterations)
+ if (Its.ugt(APInt(Its.getBitWidth(),MaxBruteForceIterations)))
return ConstantEvolutionLoopExitValue[PN] = 0; // Not going to evaluate it.
Constant *&RetVal = ConstantEvolutionLoopExitValue[PN];
return RetVal = 0; // Not derived from same PHI.
// Execute the loop symbolically to determine the exit value.
- unsigned IterationNum = 0;
- unsigned NumIterations = Its;
- if (NumIterations != Its)
- return RetVal = 0; // More than 2^32 iterations??
+ if (Its.getActiveBits() >= 32)
+ return RetVal = 0; // More than 2^32-1 iterations?? Not doing it!
+ unsigned NumIterations = Its.getZExtValue(); // must be in range
+ unsigned IterationNum = 0;
for (Constant *PHIVal = StartCST; ; ++IterationNum) {
if (IterationNum == NumIterations)
return RetVal = PHIVal; // Got exit value!
// Couldn't symbolically evaluate.
if (!CondVal) return UnknownValue;
- if (CondVal->getZExtValue() == uint64_t(ExitWhen)) {
+ if (CondVal->getValue() == uint64_t(ExitWhen)) {
ConstantEvolutionLoopExitValue[PN] = PHIVal;
++NumBruteForceTripCountsComputed;
return SCEVConstant::get(ConstantInt::get(Type::Int32Ty, IterationNum));
// this is a constant evolving PHI node, get the final value at
// the specified iteration number.
Constant *RV = getConstantEvolutionLoopExitValue(PN,
- ICC->getValue()->getZExtValue(),
+ ICC->getValue()->getValue(),
LI);
if (RV) return SCEVUnknown::get(RV);
}
}
}
}
- return SCEVUnknown::get(ConstantFold(I, Operands));
+ Constant *C =ConstantFoldInstOperands(I, &Operands[0], Operands.size());
+ return SCEVUnknown::get(C);
}
}
static std::pair<SCEVHandle,SCEVHandle>
SolveQuadraticEquation(const SCEVAddRecExpr *AddRec) {
assert(AddRec->getNumOperands() == 3 && "This is not a quadratic chrec!");
- SCEVConstant *L = dyn_cast<SCEVConstant>(AddRec->getOperand(0));
- SCEVConstant *M = dyn_cast<SCEVConstant>(AddRec->getOperand(1));
- SCEVConstant *N = dyn_cast<SCEVConstant>(AddRec->getOperand(2));
+ SCEVConstant *LC = dyn_cast<SCEVConstant>(AddRec->getOperand(0));
+ SCEVConstant *MC = dyn_cast<SCEVConstant>(AddRec->getOperand(1));
+ SCEVConstant *NC = dyn_cast<SCEVConstant>(AddRec->getOperand(2));
// We currently can only solve this if the coefficients are constants.
- if (!L || !M || !N) {
- SCEV *CNC = new SCEVCouldNotCompute();
- return std::make_pair(CNC, CNC);
- }
-
- Constant *C = L->getValue();
- Constant *Two = ConstantInt::get(C->getType(), 2);
-
- // Convert from chrec coefficients to polynomial coefficients AX^2+BX+C
- // The B coefficient is M-N/2
- Constant *B = ConstantExpr::getSub(M->getValue(),
- ConstantExpr::getSDiv(N->getValue(),
- Two));
- // The A coefficient is N/2
- Constant *A = ConstantExpr::getSDiv(N->getValue(), Two);
-
- // Compute the B^2-4ac term.
- Constant *SqrtTerm =
- ConstantExpr::getMul(ConstantInt::get(C->getType(), 4),
- ConstantExpr::getMul(A, C));
- SqrtTerm = ConstantExpr::getSub(ConstantExpr::getMul(B, B), SqrtTerm);
-
- // Compute floor(sqrt(B^2-4ac))
- uint64_t SqrtValV = cast<ConstantInt>(SqrtTerm)->getZExtValue();
- uint64_t SqrtValV2 = (uint64_t)sqrt((double)SqrtValV);
- // The square root might not be precise for arbitrary 64-bit integer
- // values. Do some sanity checks to ensure it's correct.
- if (SqrtValV2*SqrtValV2 > SqrtValV ||
- (SqrtValV2+1)*(SqrtValV2+1) <= SqrtValV) {
+ if (!LC || !MC || !NC) {
SCEV *CNC = new SCEVCouldNotCompute();
return std::make_pair(CNC, CNC);
}
- ConstantInt *SqrtVal = ConstantInt::get(Type::Int64Ty, SqrtValV2);
- SqrtTerm = ConstantExpr::getTruncOrBitCast(SqrtVal, SqrtTerm->getType());
-
- Constant *NegB = ConstantExpr::getNeg(B);
- Constant *TwoA = ConstantExpr::getMul(A, Two);
-
- // The divisions must be performed as signed divisions.
- Constant *Solution1 =
- ConstantExpr::getSDiv(ConstantExpr::getAdd(NegB, SqrtTerm), TwoA);
- Constant *Solution2 =
- ConstantExpr::getSDiv(ConstantExpr::getSub(NegB, SqrtTerm), TwoA);
- return std::make_pair(SCEVUnknown::get(Solution1),
- SCEVUnknown::get(Solution2));
+ uint32_t BitWidth = LC->getValue()->getValue().getBitWidth();
+ const APInt &L = LC->getValue()->getValue();
+ const APInt &M = MC->getValue()->getValue();
+ const APInt &N = NC->getValue()->getValue();
+ APInt Two(BitWidth, 2);
+ APInt Four(BitWidth, 4);
+
+ {
+ using namespace APIntOps;
+ const APInt& C = L;
+ // Convert from chrec coefficients to polynomial coefficients AX^2+BX+C
+ // The B coefficient is M-N/2
+ APInt B(M);
+ B -= sdiv(N,Two);
+
+ // The A coefficient is N/2
+ APInt A(N.sdiv(Two));
+
+ // Compute the B^2-4ac term.
+ APInt SqrtTerm(B);
+ SqrtTerm *= B;
+ SqrtTerm -= Four * (A * C);
+
+ // Compute sqrt(B^2-4ac). This is guaranteed to be the nearest
+ // integer value or else APInt::sqrt() will assert.
+ APInt SqrtVal(SqrtTerm.sqrt());
+
+ // Compute the two solutions for the quadratic formula.
+ // The divisions must be performed as signed divisions.
+ APInt NegB(-B);
+ APInt TwoA( A << 1 );
+ ConstantInt *Solution1 = ConstantInt::get((NegB + SqrtVal).sdiv(TwoA));
+ ConstantInt *Solution2 = ConstantInt::get((NegB - SqrtVal).sdiv(TwoA));
+
+ return std::make_pair(SCEVUnknown::get(Solution1),
+ SCEVUnknown::get(Solution2));
+ } // end APIntOps namespace
}
/// HowFarToZero - Return the number of times a backedge comparing the specified
// If the value is a constant
if (SCEVConstant *C = dyn_cast<SCEVConstant>(V)) {
// If the value is already zero, the branch will execute zero times.
- if (C->getValue()->isNullValue()) return C;
+ if (C->getValue()->isZero()) return C;
return UnknownValue; // Otherwise it will loop infinitely.
}
// should not accept a root of 2.
SCEVHandle Val = AddRec->evaluateAtIteration(R1);
if (SCEVConstant *EvalVal = dyn_cast<SCEVConstant>(Val))
- if (EvalVal->getValue()->isNullValue())
+ if (EvalVal->getValue()->isZero())
return R1; // We found a quadratic root!
}
}
// If the start is a non-zero constant, shift the range to simplify things.
if (SCEVConstant *SC = dyn_cast<SCEVConstant>(getStart()))
- if (!SC->getValue()->isNullValue()) {
+ if (!SC->getValue()->isZero()) {
std::vector<SCEVHandle> Operands(op_begin(), op_end());
Operands[0] = SCEVUnknown::getIntegerSCEV(0, SC->getType());
SCEVHandle Shifted = SCEVAddRecExpr::get(Operands, getLoop());
if (SCEVAddRecExpr *ShiftedAddRec = dyn_cast<SCEVAddRecExpr>(Shifted))
return ShiftedAddRec->getNumIterationsInRange(
- Range.subtract(SC->getValue()),isSigned);
+ Range.subtract(SC->getValue()->getValue()),isSigned);
// This is strange and shouldn't happen.
return new SCEVCouldNotCompute();
}
// First check to see if the range contains zero. If not, the first
// iteration exits.
- ConstantInt *Zero = ConstantInt::get(getType(), 0);
- if (!Range.contains(Zero, isSigned)) return SCEVConstant::get(Zero);
+ if (!Range.contains(APInt(getBitWidth(),0)))
+ return SCEVConstant::get(ConstantInt::get(getType(),0));
if (isAffine()) {
// If this is an affine expression then we have this situation:
// Since we know that zero is in the range, we know that the upper value of
// the range must be the first possible exit value. Also note that we
// already checked for a full range.
- ConstantInt *Upper = cast<ConstantInt>(Range.getUpper());
- ConstantInt *A = cast<SCEVConstant>(getOperand(1))->getValue();
- ConstantInt *One = ConstantInt::get(getType(), 1);
+ const APInt &Upper = Range.getUpper();
+ APInt A = cast<SCEVConstant>(getOperand(1))->getValue()->getValue();
+ APInt One(getBitWidth(),1);
// The exit value should be (Upper+A-1)/A.
- Constant *ExitValue = Upper;
- if (A != One) {
- ExitValue = ConstantExpr::getSub(ConstantExpr::getAdd(Upper, A), One);
- ExitValue = ConstantExpr::getSDiv(ExitValue, A);
- }
- assert(isa<ConstantInt>(ExitValue) &&
- "Constant folding of integers not implemented?");
+ APInt ExitVal(Upper);
+ if (A != One)
+ ExitVal = (Upper + A - One).sdiv(A);
+ ConstantInt *ExitValue = ConstantInt::get(ExitVal);
// Evaluate at the exit value. If we really did fall out of the valid
// range, then we computed our trip count, otherwise wrap around or other
// things must have happened.
ConstantInt *Val = EvaluateConstantChrecAtConstant(this, ExitValue);
- if (Range.contains(Val, isSigned))
+ if (Range.contains(Val->getValue()))
return new SCEVCouldNotCompute(); // Something strange happened
// Ensure that the previous value is in the range. This is a sanity check.
- assert(Range.contains(EvaluateConstantChrecAtConstant(this,
- ConstantExpr::getSub(ExitValue, One)), isSigned) &&
+ assert(Range.contains(
+ EvaluateConstantChrecAtConstant(this,
+ ConstantInt::get(ExitVal - One))->getValue()) &&
"Linear scev computation is off in a bad way!");
return SCEVConstant::get(cast<ConstantInt>(ExitValue));
} else if (isQuadratic()) {
// terms of figuring out when zero is crossed, instead of when
// Range.getUpper() is crossed.
std::vector<SCEVHandle> NewOps(op_begin(), op_end());
- NewOps[0] = SCEV::getNegativeSCEV(SCEVUnknown::get(Range.getUpper()));
+ NewOps[0] = SCEV::getNegativeSCEV(SCEVUnknown::get(
+ ConstantInt::get(Range.getUpper())));
SCEVHandle NewAddRec = SCEVAddRecExpr::get(NewOps, getLoop());
// Next, solve the constructed addrec
// for "X*X < 5", for example, we should not return a root of 2.
ConstantInt *R1Val = EvaluateConstantChrecAtConstant(this,
R1->getValue());
- if (Range.contains(R1Val, isSigned)) {
+ if (Range.contains(R1Val->getValue())) {
// The next iteration must be out of the range...
- Constant *NextVal =
- ConstantExpr::getAdd(R1->getValue(),
- ConstantInt::get(R1->getType(), 1));
+ Constant *NextVal = ConstantInt::get(R1->getValue()->getValue()+1);
R1Val = EvaluateConstantChrecAtConstant(this, NextVal);
- if (!Range.contains(R1Val, isSigned))
+ if (!Range.contains(R1Val->getValue()))
return SCEVUnknown::get(NextVal);
return new SCEVCouldNotCompute(); // Something strange happened
}
// If R1 was not in the range, then it is a good return value. Make
// sure that R1-1 WAS in the range though, just in case.
- Constant *NextVal =
- ConstantExpr::getSub(R1->getValue(),
- ConstantInt::get(R1->getType(), 1));
+ Constant *NextVal = ConstantInt::get(R1->getValue()->getValue()-1);
R1Val = EvaluateConstantChrecAtConstant(this, NextVal);
- if (Range.contains(R1Val, isSigned))
+ if (Range.contains(R1Val->getValue()))
return R1;
return new SCEVCouldNotCompute(); // Something strange happened
}
// incredibly important, we will be able to simplify the exit test a lot, and
// we are almost guaranteed to get a trip count in this case.
ConstantInt *TestVal = ConstantInt::get(getType(), 0);
- ConstantInt *One = ConstantInt::get(getType(), 1);
ConstantInt *EndVal = TestVal; // Stop when we wrap around.
do {
++NumBruteForceEvaluations;
return new SCEVCouldNotCompute();
// Check to see if we found the value!
- if (!Range.contains(cast<SCEVConstant>(Val)->getValue(), isSigned))
+ if (!Range.contains(cast<SCEVConstant>(Val)->getValue()->getValue()))
return SCEVConstant::get(TestVal);
// Increment to test the next index.
- TestVal = cast<ConstantInt>(ConstantExpr::getAdd(TestVal, One));
+ TestVal = ConstantInt::get(TestVal->getValue()+1);
} while (TestVal != EndVal);
return new SCEVCouldNotCompute();
projects / oota-llvm.git / blobdiff