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Factor SCEV traversal code so I can use it elsewhere. No functionality.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@160203 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2012-07-13 23:33:03 +00:00
parent 06a6a300c5
commit 8b7036b0f4
2 changed files with 87 additions and 52 deletions
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72
lib/Analysis/ScalarEvolution.cpp
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@@ -6894,59 +6894,27 @@ bool ScalarEvolution::properlyDominates(const SCEV *S, const BasicBlock *BB) {
return getBlockDisposition(S, BB) == ProperlyDominatesBlock;
}
namespace {
// Search for a SCEV expression node within an expression tree.
// Implements SCEVTraversal::Visitor.
struct SCEVSearch {
const SCEV *Node;
bool IsFound;
SCEVSearch(const SCEV *N): Node(N), IsFound(false) {}
bool follow(const SCEV *S) {
IsFound |= (S == Node);
return !IsFound;
}
bool isDone() const { return IsFound; }
};
}
bool ScalarEvolution::hasOperand(const SCEV *S, const SCEV *Op) const {
SmallVector<const SCEV *, 8> Worklist;
Worklist.push_back(S);
do {
S = Worklist.pop_back_val();
switch (S->getSCEVType()) {
case scConstant:
break;
case scTruncate:
case scZeroExtend:
case scSignExtend: {
const SCEVCastExpr *Cast = cast<SCEVCastExpr>(S);
const SCEV *CastOp = Cast->getOperand();
if (Op == CastOp)
return true;
Worklist.push_back(CastOp);
break;
}
case scAddRecExpr:
case scAddExpr:
case scMulExpr:
case scUMaxExpr:
case scSMaxExpr: {
const SCEVNAryExpr *NAry = cast<SCEVNAryExpr>(S);
for (SCEVNAryExpr::op_iterator I = NAry->op_begin(), E = NAry->op_end();
I != E; ++I) {
const SCEV *NAryOp = *I;
if (NAryOp == Op)
return true;
Worklist.push_back(NAryOp);
}
break;
}
case scUDivExpr: {
const SCEVUDivExpr *UDiv = cast<SCEVUDivExpr>(S);
const SCEV *LHS = UDiv->getLHS(), *RHS = UDiv->getRHS();
if (LHS == Op || RHS == Op)
return true;
Worklist.push_back(LHS);
Worklist.push_back(RHS);
break;
}
case scUnknown:
break;
case scCouldNotCompute:
llvm_unreachable("Attempt to use a SCEVCouldNotCompute object!");
default:
llvm_unreachable("Unknown SCEV kind!");
}
} while (!Worklist.empty());
return false;
SCEVSearch Search(Op);
visitAll(S, Search);
return Search.IsFound;
}
void ScalarEvolution::forgetMemoizedResults(const SCEV *S) {