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CSE: cse builtin "once" calls

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`builtin "once"` calls are a result of inlining global accessors
This commit is contained in:
Erik Eckstein
2023-05-08 13:24:39 +02:00
parent 47a7acd4a7
commit 56c09c3aed
2 changed files with 47 additions and 4 deletions
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14
lib/SILOptimizer/Transforms/CSE.cpp
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@@ -1187,11 +1187,17 @@ bool CSE::canHandle(SILInstruction *Inst) {
return false;
}
if (auto *BI = dyn_cast<BuiltinInst>(Inst)) {
// Although the onFastPath builtin has no side-effects we don't want to
// (re-)move it.
if (BI->getBuiltinInfo().ID == BuiltinValueKind::OnFastPath)
switch (BI->getBuiltinInfo().ID) {
case BuiltinValueKind::OnFastPath:
// Although the onFastPath builtin has no side-effects we don't want to
// (re-)move it.
return false;
return !BI->mayReadOrWriteMemory();
case BuiltinValueKind::Once:
case BuiltinValueKind::OnceWithContext:
return true;
default:
return !BI->mayReadOrWriteMemory();
}
}
if (auto *EMI = dyn_cast<ExistentialMetatypeInst>(Inst)) {
return !EMI->getOperand()->getType().isAddress();