================
@@ -1085,11 +1080,17 @@ class LoanPropagationAnalysis
/// Merges two lattices by taking the union of loans for each origin.
// TODO(opt): Keep the state small by removing origins which become dead.
Lattice join(Lattice A, Lattice B) {
- OriginLoanMap JoinedOrigins =
- utils::join(A.Origins, B.Origins, OriginLoanMapFactory,
- [&](LoanSet S1, LoanSet S2) {
- return utils::join(S1, S2, LoanSetFactory);
- });
+ OriginLoanMap JoinedOrigins = utils::join(
+ A.Origins, B.Origins, OriginLoanMapFactory,
+ [&](const LoanSet *S1, const LoanSet *S2) {
+ assert((S1 || S2) && "unexpectedly merging 2 empty sets");
+ if (!S1)
+ return *S2;
+ if (!S2)
+ return *S1;
+ return utils::join(*S1, *S2, LoanSetFactory);
+ },
+ /*JoinAllKeys=*/false);
----------------
Xazax-hun wrote:
Could you elaborate on why do we not want to join all the keys?
https://github.com/llvm/llvm-project/pull/159991
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