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JIT: Propagate class handle when split tree #128485

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JIT: Propagate class handle when split tree #128485

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d483f82
Preserve class handle when split tree
hez2010 May 22, 2026
29589f0
Nit
hez2010 May 22, 2026
3c2c4b8
format jit
hez2010 May 22, 2026
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25 changes: 21 additions & 4 deletions src/coreclr/jit/gentree.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -18679,10 +18679,27 @@ bool Compiler::gtSplitTree(BasicBlock* block,
m_compiler->lvaGetDesc(lclNum)->lvIsMultiRegRet = true;
}

GenTree* store = m_compiler->gtNewTempStore(lclNum, *use);
stmt = m_compiler->fgNewStmtFromTree(store, m_splitStmt->GetDebugInfo());
*use = m_compiler->gtNewLclvNode(lclNum, genActualType(*use));
MadeChanges = true;
GenTree* value = *use;
GenTree* store = m_compiler->gtNewTempStore(lclNum, value);

LclVarDsc* const lclDsc = m_compiler->lvaGetDesc(lclNum);
lclDsc->lvSingleDef = 1;
JITDUMP("Marked V%02u as a single def temp\n", lclNum);

if (value->TypeIs(TYP_REF))
{
bool isExact = false;
bool isNonNull = false;
CORINFO_CLASS_HANDLE clsHnd = m_compiler->gtGetClassHandle(value, &isExact, &isNonNull);
if (clsHnd != NO_CLASS_HANDLE)
{
m_compiler->lvaSetClass(lclNum, clsHnd, isExact);
}
}

stmt = m_compiler->fgNewStmtFromTree(store, m_splitStmt->GetDebugInfo());
*use = m_compiler->gtNewLclvNode(lclNum, genActualType(value));
MadeChanges = true;
}

if (stmt != nullptr)
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