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[SCEV] Use Operator::getOpcode instead of manual dispatch; NFC 

llvm-svn: 264746
This commit is contained in:
Sanjoy Das 2016-03-29 16:40:39 +00:00
parent 4c1ef97adb
commit 260ad4dd63
1 changed files with 3 additions and 8 deletions
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11
llvm/lib/Analysis/ScalarEvolution.cpp
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@ -4730,29 +4730,24 @@ const SCEV *ScalarEvolution::createSCEV(Value *V) {
if (!isSCEVable(V->getType()))
return getUnknown(V);
unsigned Opcode = Instruction::UserOp1;
if (Instruction *I = dyn_cast<Instruction>(V)) {
Opcode = I->getOpcode();
// Don't attempt to analyze instructions in blocks that aren't
// reachable. Such instructions don't matter, and they aren't required
// to obey basic rules for definitions dominating uses which this
// analysis depends on.
if (!DT.isReachableFromEntry(I->getParent()))
return getUnknown(V);
} else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
Opcode = CE->getOpcode();
else if (ConstantInt *CI = dyn_cast<ConstantInt>(V))
} else if (ConstantInt *CI = dyn_cast<ConstantInt>(V))
return getConstant(CI);
else if (isa<ConstantPointerNull>(V))
return getZero(V->getType());
else if (GlobalAlias *GA = dyn_cast<GlobalAlias>(V))
return GA->mayBeOverridden() ? getUnknown(V) : getSCEV(GA->getAliasee());
else
else if (!isa<ConstantExpr>(V))
return getUnknown(V);
Operator *U = cast<Operator>(V);
switch (Opcode) {
switch (U->getOpcode()) {
case Instruction::Add: {
// The simple thing to do would be to just call getSCEV on both operands
// and call getAddExpr with the result. However if we're looking at a