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More const qualifiers.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@69451 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-04-18 17:57:20 +00:00
parent 890f92b744
commit b40c23672b
1 changed files with 14 additions and 14 deletions
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28
lib/Analysis/LoopVR.cpp
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@ -38,14 +38,14 @@ ConstantRange LoopVR::getRange(SCEVHandle S, Loop *L, ScalarEvolution &SE) {
/// getRange - determine the range for a particular SCEV with a given trip count
ConstantRange LoopVR::getRange(SCEVHandle S, SCEVHandle T, ScalarEvolution &SE){
if (SCEVConstant *C = dyn_cast<SCEVConstant>(S))
if (const SCEVConstant *C = dyn_cast<SCEVConstant>(S))
return ConstantRange(C->getValue()->getValue());
ConstantRange FullSet(cast<IntegerType>(S->getType())->getBitWidth(), true);
// {x,+,y,+,...z}. We detect overflow by checking the size of the set after
// summing the upper and lower.
if (SCEVAddExpr *Add = dyn_cast<SCEVAddExpr>(S)) {
if (const SCEVAddExpr *Add = dyn_cast<SCEVAddExpr>(S)) {
ConstantRange X = getRange(Add->getOperand(0), T, SE);
if (X.isFullSet()) return FullSet;
for (unsigned i = 1, e = Add->getNumOperands(); i != e; ++i) {
@ -67,7 +67,7 @@ ConstantRange LoopVR::getRange(SCEVHandle S, SCEVHandle T, ScalarEvolution &SE){
// {x,*,y,*,...,z}. In order to detect overflow, we use k*bitwidth where
// k is the number of terms being multiplied.
if (SCEVMulExpr *Mul = dyn_cast<SCEVMulExpr>(S)) {
if (const SCEVMulExpr *Mul = dyn_cast<SCEVMulExpr>(S)) {
ConstantRange X = getRange(Mul->getOperand(0), T, SE);
if (X.isFullSet()) return FullSet;
@ -91,7 +91,7 @@ ConstantRange LoopVR::getRange(SCEVHandle S, SCEVHandle T, ScalarEvolution &SE){
// smax(X_smax, Y_smax, ..., Z_smax))
// It doesn't matter if one of the SCEVs has FullSet because we're taking
// a maximum of the minimums across all of them.
if (SCEVSMaxExpr *SMax = dyn_cast<SCEVSMaxExpr>(S)) {
if (const SCEVSMaxExpr *SMax = dyn_cast<SCEVSMaxExpr>(S)) {
ConstantRange X = getRange(SMax->getOperand(0), T, SE);
if (X.isFullSet()) return FullSet;
@ -109,7 +109,7 @@ ConstantRange LoopVR::getRange(SCEVHandle S, SCEVHandle T, ScalarEvolution &SE){
// umax(X_umax, Y_umax, ..., Z_umax))
// It doesn't matter if one of the SCEVs has FullSet because we're taking
// a maximum of the minimums across all of them.
if (SCEVUMaxExpr *UMax = dyn_cast<SCEVUMaxExpr>(S)) {
if (const SCEVUMaxExpr *UMax = dyn_cast<SCEVUMaxExpr>(S)) {
ConstantRange X = getRange(UMax->getOperand(0), T, SE);
if (X.isFullSet()) return FullSet;
@ -124,7 +124,7 @@ ConstantRange LoopVR::getRange(SCEVHandle S, SCEVHandle T, ScalarEvolution &SE){
}
// L udiv R. Luckily, there's only ever 2 sides to a udiv.
if (SCEVUDivExpr *UDiv = dyn_cast<SCEVUDivExpr>(S)) {
if (const SCEVUDivExpr *UDiv = dyn_cast<SCEVUDivExpr>(S)) {
ConstantRange L = getRange(UDiv->getLHS(), T, SE);
ConstantRange R = getRange(UDiv->getRHS(), T, SE);
if (L.isFullSet() && R.isFullSet()) return FullSet;
@ -158,34 +158,34 @@ ConstantRange LoopVR::getRange(SCEVHandle S, SCEVHandle T, ScalarEvolution &SE){
// ConstantRange already implements the cast operators.
if (SCEVZeroExtendExpr *ZExt = dyn_cast<SCEVZeroExtendExpr>(S)) {
if (const SCEVZeroExtendExpr *ZExt = dyn_cast<SCEVZeroExtendExpr>(S)) {
T = SE.getTruncateOrZeroExtend(T, ZExt->getOperand()->getType());
ConstantRange X = getRange(ZExt->getOperand(), T, SE);
return X.zeroExtend(cast<IntegerType>(ZExt->getType())->getBitWidth());
}
if (SCEVSignExtendExpr *SExt = dyn_cast<SCEVSignExtendExpr>(S)) {
if (const SCEVSignExtendExpr *SExt = dyn_cast<SCEVSignExtendExpr>(S)) {
T = SE.getTruncateOrZeroExtend(T, SExt->getOperand()->getType());
ConstantRange X = getRange(SExt->getOperand(), T, SE);
return X.signExtend(cast<IntegerType>(SExt->getType())->getBitWidth());
}
if (SCEVTruncateExpr *Trunc = dyn_cast<SCEVTruncateExpr>(S)) {
if (const SCEVTruncateExpr *Trunc = dyn_cast<SCEVTruncateExpr>(S)) {
T = SE.getTruncateOrZeroExtend(T, Trunc->getOperand()->getType());
ConstantRange X = getRange(Trunc->getOperand(), T, SE);
if (X.isFullSet()) return FullSet;
return X.truncate(cast<IntegerType>(Trunc->getType())->getBitWidth());
}
if (SCEVAddRecExpr *AddRec = dyn_cast<SCEVAddRecExpr>(S)) {
SCEVConstant *Trip = dyn_cast<SCEVConstant>(T);
if (const SCEVAddRecExpr *AddRec = dyn_cast<SCEVAddRecExpr>(S)) {
const SCEVConstant *Trip = dyn_cast<SCEVConstant>(T);
if (!Trip) return FullSet;
if (AddRec->isAffine()) {
SCEVHandle StartHandle = AddRec->getStart();
SCEVHandle StepHandle = AddRec->getOperand(1);
SCEVConstant *Step = dyn_cast<SCEVConstant>(StepHandle);
const SCEVConstant *Step = dyn_cast<SCEVConstant>(StepHandle);
if (!Step) return FullSet;
uint32_t ExWidth = 2 * Trip->getValue()->getBitWidth();
@ -196,8 +196,8 @@ ConstantRange LoopVR::getRange(SCEVHandle S, SCEVHandle T, ScalarEvolution &SE){
SCEVHandle EndHandle = SE.getAddExpr(StartHandle,
SE.getMulExpr(T, StepHandle));
SCEVConstant *Start = dyn_cast<SCEVConstant>(StartHandle);
SCEVConstant *End = dyn_cast<SCEVConstant>(EndHandle);
const SCEVConstant *Start = dyn_cast<SCEVConstant>(StartHandle);
const SCEVConstant *End = dyn_cast<SCEVConstant>(EndHandle);
if (!Start || !End) return FullSet;
const APInt &StartInt = Start->getValue()->getValue();