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Used DAGNodeWorklist in visitTransitiveEndBorrows. #39775

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Merged
merged 1 commit into from
Oct 16, 2021
Merged

Used DAGNodeWorklist in visitTransitiveEndBorrows. #39775

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4 changes: 2 additions & 2 deletions lib/SIL/Utils/OwnershipUtils.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1438,11 +1438,11 @@ void swift::findTransitiveReborrowBaseValuePairs(
void swift::visitTransitiveEndBorrows(
BorrowedValue beginBorrow,
function_ref<void(EndBorrowInst *)> visitEndBorrow) {
SmallSetVector<SILValue, 4> worklist;
DAGNodeWorklist<SILValue, 4> worklist;
worklist.insert(beginBorrow.value);

while (!worklist.empty()) {
auto val = worklist.pop_back_val();
auto val = worklist.pop();
for (auto *consumingUse : val->getConsumingUses()) {
auto *consumingUser = consumingUse->getUser();
if (auto *branch = dyn_cast<BranchInst>(consumingUser)) {
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27 changes: 27 additions & 0 deletions test/SILOptimizer/dead_code_elimination_nontrivial_ossa.sil
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Expand Up @@ -652,3 +652,30 @@ bb4(%3 : @owned $Klass):
return %res : $()
}

// CHECK-LABEL: sil [ossa] @looping_borrow : $@convention(thin) () -> () {
// CHECK-NOT: destroy_value
// CHECK-LABEL: } // end sil function 'looping_borrow'
sil [ossa] @looping_borrow : $@convention(thin) () -> () {
entry:
%instance_1 = enum $FakeOptional<Klass>, #FakeOptional.none!enumelt
%lifetime_1 = begin_borrow [lexical] %instance_1 : $FakeOptional<Klass>
br loop_entry(%instance_1 : $FakeOptional<Klass>, %lifetime_1 : $FakeOptional<Klass>)

loop_entry(%18 : @owned $FakeOptional<Klass>, %19 : @guaranteed $FakeOptional<Klass>):
br loop_body

loop_body:
cond_br undef, loop_back, loop_exit

loop_back:
br loop_entry(%18 : $FakeOptional<Klass>, %19 : $FakeOptional<Klass>)

loop_exit:
end_borrow %19 : $FakeOptional<Klass>
destroy_value %18 : $FakeOptional<Klass>
br exit

exit:
%retval = tuple ()
return %retval : $()
}