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[DenseMap] Fix constness issues with lookup_or #139247

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[DenseMap] Fix constness issues with lookup_or #139247

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9 changes: 7 additions & 2 deletions llvm/include/llvm/ADT/DenseMap.h
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Original file line number Diff line number Diff line change
Expand Up @@ -220,8 +220,13 @@ class DenseMapBase : public DebugEpochBase {
// Return the entry with the specified key, or \p Default. This variant is
// useful, because `lookup` cannot be used with non-default-constructible
// values.
ValueT lookup_or(const_arg_type_t<KeyT> Val,
const_arg_type_t<ValueT> Default) const {
ValueT lookup_or(const_arg_type_t<KeyT> Val, const ValueT &Default) const {
if (const BucketT *Bucket = doFind(Val))
return Bucket->getSecond();
return Default;
}

ValueT lookup_or(const_arg_type_t<KeyT> Val, ValueT &&Default) const {
if (const BucketT *Bucket = doFind(Val))
return Bucket->getSecond();
return Default;
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5 changes: 1 addition & 4 deletions llvm/lib/Analysis/ScalarEvolution.cpp
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Expand Up @@ -15860,10 +15860,7 @@ const SCEV *ScalarEvolution::LoopGuards::rewrite(const SCEV *Expr) const {
const SCEV *visitAddRecExpr(const SCEVAddRecExpr *Expr) { return Expr; }

const SCEV *visitUnknown(const SCEVUnknown *Expr) {
auto I = Map.find(Expr);
if (I == Map.end())
return Expr;
return I->second;
return Map.lookup_or(Expr, Expr);
}

const SCEV *visitZeroExtendExpr(const SCEVZeroExtendExpr *Expr) {
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4 changes: 3 additions & 1 deletion llvm/unittests/ADT/DenseMapTest.cpp
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Expand Up @@ -668,7 +668,9 @@ TEST(DenseMapCustomTest, LookupOr) {

EXPECT_EQ(M.lookup_or(0, 4u), 3u);
EXPECT_EQ(M.lookup_or(1, 4u), 0u);
EXPECT_EQ(M.lookup_or(2, 4u), 4u);

NonDefaultConstructible DefaultV = M.lookup_or(2, 4u);
EXPECT_EQ(DefaultV, 4u);
}

// Key traits that allows lookup with either an unsigned or char* key;
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