[DenseMap] Fix constness issues with lookup_or #139247
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@llvm/pr-subscribers-llvm-analysis Author: Ramkumar Ramachandra (artagnon) ChangesAlso demonstrate its use in ScalarEvolution. Full diff: https://github.com/llvm/llvm-project/pull/139247.diff 3 Files Affected:
diff --git a/llvm/include/llvm/ADT/DenseMap.h b/llvm/include/llvm/ADT/DenseMap.h
index 4df50e03de94b..acc81f069a5aa 100644
--- a/llvm/include/llvm/ADT/DenseMap.h
+++ b/llvm/include/llvm/ADT/DenseMap.h
@@ -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;
diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
index 3f9614254ae7a..0b0748b7ffe78 100644
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
@@ -9571,15 +9571,14 @@ getConstantEvolvingPHIOperands(Instruction *UseInst, const Loop *L,
if (!OpInst || !canConstantEvolve(OpInst, L)) return nullptr;
PHINode *P = dyn_cast<PHINode>(OpInst);
- if (!P)
+ if (!P) {
// If this operand is already visited, reuse the prior result.
// We may have P != PHI if this is the deepest point at which the
// inconsistent paths meet.
- P = PHIMap.lookup(OpInst);
- if (!P) {
// Recurse and memoize the results, whether a phi is found or not.
// This recursive call invalidates pointers into PHIMap.
- P = getConstantEvolvingPHIOperands(OpInst, L, PHIMap, Depth + 1);
+ P = PHIMap.lookup_or(
+ OpInst, getConstantEvolvingPHIOperands(OpInst, L, PHIMap, Depth + 1));
PHIMap[OpInst] = P;
}
if (!P)
@@ -15860,10 +15859,7 @@ 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) {
@@ -15891,25 +15887,19 @@ const SCEV *ScalarEvolution::LoopGuards::rewrite(const SCEV *Expr) const {
}
const SCEV *visitSignExtendExpr(const SCEVSignExtendExpr *Expr) {
- auto I = Map.find(Expr);
- if (I == Map.end())
- return SCEVRewriteVisitor<SCEVLoopGuardRewriter>::visitSignExtendExpr(
- Expr);
- return I->second;
+ return Map.lookup_or(
+ Expr,
+ SCEVRewriteVisitor<SCEVLoopGuardRewriter>::visitSignExtendExpr(Expr));
}
const SCEV *visitUMinExpr(const SCEVUMinExpr *Expr) {
- auto I = Map.find(Expr);
- if (I == Map.end())
- return SCEVRewriteVisitor<SCEVLoopGuardRewriter>::visitUMinExpr(Expr);
- return I->second;
+ return Map.lookup_or(
+ Expr, SCEVRewriteVisitor<SCEVLoopGuardRewriter>::visitUMinExpr(Expr));
}
const SCEV *visitSMinExpr(const SCEVSMinExpr *Expr) {
- auto I = Map.find(Expr);
- if (I == Map.end())
- return SCEVRewriteVisitor<SCEVLoopGuardRewriter>::visitSMinExpr(Expr);
- return I->second;
+ return Map.lookup_or(
+ Expr, SCEVRewriteVisitor<SCEVLoopGuardRewriter>::visitSMinExpr(Expr));
}
const SCEV *visitAddExpr(const SCEVAddExpr *Expr) {
diff --git a/llvm/unittests/ADT/DenseMapTest.cpp b/llvm/unittests/ADT/DenseMapTest.cpp
index d002a3c15cf52..cf90b10495a14 100644
--- a/llvm/unittests/ADT/DenseMapTest.cpp
+++ b/llvm/unittests/ADT/DenseMapTest.cpp
@@ -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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@llvm/pr-subscribers-llvm-adt Author: Ramkumar Ramachandra (artagnon) ChangesAlso demonstrate its use in ScalarEvolution. Full diff: https://github.com/llvm/llvm-project/pull/139247.diff 3 Files Affected:
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nikic
requested changes
May 9, 2025
nikic
reviewed
May 9, 2025
Also demonstrate its use in ScalarEvolution.
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Also demonstrate its use in ScalarEvolution.