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Use expandCodeFor instead of expand when the result will be

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immediately casted. At present, this is just a minor code
simplification. In the future, the expansion code may be able
to make better choices if it knows what the desired result
type will be.

llvm-svn: 73137
This commit is contained in:
Dan Gohman 2009-06-09 17:18:38 +00:00
parent 2121a84223
commit 389d27ecdd
1 changed files with 18 additions and 29 deletions
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47
lib/Analysis/ScalarEvolutionExpander.cpp
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@ -319,8 +319,7 @@ Value *SCEVExpander::expandAddToGEP(const SCEVHandle *op_begin,
if (!AnyNonZeroIndices) {
V = InsertNoopCastOfTo(V,
Type::Int8Ty->getPointerTo(PTy->getAddressSpace()));
Value *Idx = expand(SE.getAddExpr(Ops));
Idx = InsertNoopCastOfTo(Idx, Ty);
Value *Idx = expandCodeFor(SE.getAddExpr(Ops), Ty);
// Fold a GEP with constant operands.
if (Constant *CLHS = dyn_cast<Constant>(V))
@ -374,8 +373,7 @@ Value *SCEVExpander::visitAddExpr(const SCEVAddExpr *S) {
// Emit a bunch of add instructions
for (int i = S->getNumOperands()-2; i >= 0; --i) {
Value *W = expand(S->getOperand(i));
W = InsertNoopCastOfTo(W, Ty);
Value *W = expandCodeFor(S->getOperand(i), Ty);
V = InsertBinop(Instruction::Add, V, W, InsertPt);
}
return V;
@ -389,13 +387,11 @@ Value *SCEVExpander::visitMulExpr(const SCEVMulExpr *S) {
FirstOp = 1;
int i = S->getNumOperands()-2;
Value *V = expand(S->getOperand(i+1));
V = InsertNoopCastOfTo(V, Ty);
Value *V = expandCodeFor(S->getOperand(i+1), Ty);
// Emit a bunch of multiply instructions
for (; i >= FirstOp; --i) {
Value *W = expand(S->getOperand(i));
W = InsertNoopCastOfTo(W, Ty);
Value *W = expandCodeFor(S->getOperand(i), Ty);
V = InsertBinop(Instruction::Mul, V, W, InsertPt);
}
@ -408,8 +404,7 @@ Value *SCEVExpander::visitMulExpr(const SCEVMulExpr *S) {
Value *SCEVExpander::visitUDivExpr(const SCEVUDivExpr *S) {
const Type *Ty = SE.getEffectiveSCEVType(S->getType());
Value *LHS = expand(S->getLHS());
LHS = InsertNoopCastOfTo(LHS, Ty);
Value *LHS = expandCodeFor(S->getLHS(), Ty);
if (const SCEVConstant *SC = dyn_cast<SCEVConstant>(S->getRHS())) {
const APInt &RHS = SC->getValue()->getValue();
if (RHS.isPowerOf2())
@ -418,8 +413,7 @@ Value *SCEVExpander::visitUDivExpr(const SCEVUDivExpr *S) {
InsertPt);
}
Value *RHS = expand(S->getRHS());
RHS = InsertNoopCastOfTo(RHS, Ty);
Value *RHS = expandCodeFor(S->getRHS(), Ty);
return InsertBinop(Instruction::UDiv, LHS, RHS, InsertPt);
}
@ -513,10 +507,9 @@ Value *SCEVExpander::visitAddRecExpr(const SCEVAddRecExpr *S) {
// If this is a simple linear addrec, emit it now as a special case.
if (S->isAffine()) { // {0,+,F} --> i*F
Value *F = expand(S->getOperand(1));
F = InsertNoopCastOfTo(F, Ty);
Value *F = expandCodeFor(S->getOperand(1), Ty);
// IF the step is by one, just return the inserted IV.
// If the step is by one, just return the inserted IV.
if (ConstantInt *CI = dyn_cast<ConstantInt>(F))
if (CI->getValue() == 1)
return I;
@ -563,8 +556,8 @@ Value *SCEVExpander::visitAddRecExpr(const SCEVAddRecExpr *S) {
Value *SCEVExpander::visitTruncateExpr(const SCEVTruncateExpr *S) {
const Type *Ty = SE.getEffectiveSCEVType(S->getType());
Value *V = expand(S->getOperand());
V = InsertNoopCastOfTo(V, SE.getEffectiveSCEVType(V->getType()));
Value *V = expandCodeFor(S->getOperand(),
SE.getEffectiveSCEVType(S->getOperand()->getType()));
Instruction *I = new TruncInst(V, Ty, "tmp.", InsertPt);
InsertedValues.insert(I);
return I;
@ -572,8 +565,8 @@ Value *SCEVExpander::visitTruncateExpr(const SCEVTruncateExpr *S) {
Value *SCEVExpander::visitZeroExtendExpr(const SCEVZeroExtendExpr *S) {
const Type *Ty = SE.getEffectiveSCEVType(S->getType());
Value *V = expand(S->getOperand());
V = InsertNoopCastOfTo(V, SE.getEffectiveSCEVType(V->getType()));
Value *V = expandCodeFor(S->getOperand(),
SE.getEffectiveSCEVType(S->getOperand()->getType()));
Instruction *I = new ZExtInst(V, Ty, "tmp.", InsertPt);
InsertedValues.insert(I);
return I;
@ -581,8 +574,8 @@ Value *SCEVExpander::visitZeroExtendExpr(const SCEVZeroExtendExpr *S) {
Value *SCEVExpander::visitSignExtendExpr(const SCEVSignExtendExpr *S) {
const Type *Ty = SE.getEffectiveSCEVType(S->getType());
Value *V = expand(S->getOperand());
V = InsertNoopCastOfTo(V, SE.getEffectiveSCEVType(V->getType()));
Value *V = expandCodeFor(S->getOperand(),
SE.getEffectiveSCEVType(S->getOperand()->getType()));
Instruction *I = new SExtInst(V, Ty, "tmp.", InsertPt);
InsertedValues.insert(I);
return I;
@ -590,11 +583,9 @@ Value *SCEVExpander::visitSignExtendExpr(const SCEVSignExtendExpr *S) {
Value *SCEVExpander::visitSMaxExpr(const SCEVSMaxExpr *S) {
const Type *Ty = SE.getEffectiveSCEVType(S->getType());
Value *LHS = expand(S->getOperand(0));
LHS = InsertNoopCastOfTo(LHS, Ty);
Value *LHS = expandCodeFor(S->getOperand(0), Ty);
for (unsigned i = 1; i < S->getNumOperands(); ++i) {
Value *RHS = expand(S->getOperand(i));
RHS = InsertNoopCastOfTo(RHS, Ty);
Value *RHS = expandCodeFor(S->getOperand(i), Ty);
Instruction *ICmp =
new ICmpInst(ICmpInst::ICMP_SGT, LHS, RHS, "tmp", InsertPt);
InsertedValues.insert(ICmp);
@ -607,11 +598,9 @@ Value *SCEVExpander::visitSMaxExpr(const SCEVSMaxExpr *S) {
Value *SCEVExpander::visitUMaxExpr(const SCEVUMaxExpr *S) {
const Type *Ty = SE.getEffectiveSCEVType(S->getType());
Value *LHS = expand(S->getOperand(0));
LHS = InsertNoopCastOfTo(LHS, Ty);
Value *LHS = expandCodeFor(S->getOperand(0), Ty);
for (unsigned i = 1; i < S->getNumOperands(); ++i) {
Value *RHS = expand(S->getOperand(i));
RHS = InsertNoopCastOfTo(RHS, Ty);
Value *RHS = expandCodeFor(S->getOperand(i), Ty);
Instruction *ICmp =
new ICmpInst(ICmpInst::ICMP_UGT, LHS, RHS, "tmp", InsertPt);
InsertedValues.insert(ICmp);