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JIT: Compact newly recognized loops #97149

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Jan 19, 2024
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JIT: Compact newly recognized loops #97149

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JIT: Compact newly recognized loops
jakobbotsch Jan 18, 2024
c78459f
Skip singular CALLFINALLYRET outside loop if the CALLFINALLYRET is in…
jakobbotsch Jan 18, 2024
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15 changes: 10 additions & 5 deletions src/coreclr/jit/optimizer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -4466,11 +4466,6 @@ bool Compiler::optCompactLoops()
bool changed = false;
for (FlowGraphNaturalLoop* loop : m_loops->InReversePostOrder())
{
if (!loop->GetHeader()->HasFlag(BBF_OLD_LOOP_HEADER_QUIRK))
{
continue;
}

changed |= optCompactLoop(loop);
}

Expand Down Expand Up @@ -4504,6 +4499,16 @@ bool Compiler::optCompactLoop(FlowGraphNaturalLoop* loop)
continue;
}

// If this is a CALLFINALLYRET that is not in the loop, but the
// CALLFINALLY was, then we have to leave it in place. For compaction
// purposes this doesn't really make any difference, since no codegen
// is associated with the CALLFINALLYRET anyway.
if (cur->isBBCallFinallyPairTail())
{
cur = cur->Next();
continue;
}
Comment on lines +4502 to +4510
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This is an interesting case that can occur since we do not return any EH succeessors for CALLFINALLYRET; if the CALLFINALLY/CALLFINALLYRET is inside a try whose handler loops back around, then the CALLFINALLY may be part of the loop while the CALLFINALLYRET isn't. Here's an example case; red edges are EH successor edges. The CALLFINALLY is BB19 and the CALLFINALLYRET is BB20.


BasicBlock* lastNonLoopBlock = cur;
while (true)
{
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