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Fix optAssertionProp_Update for IND of handle constant replacement #100422

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Fix optAssertionProp_Update for IND of handle constant replacement #100422

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19 changes: 19 additions & 0 deletions src/coreclr/jit/assertionprop.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5428,6 +5428,25 @@ GenTree* Compiler::optAssertionProp_Update(GenTree* newTree, GenTree* tree, Stat
if (parent != nullptr)
{
parent->ReplaceOperand(useEdge, newTree);

// If the parent is a GT_IND and we replaced the child with a handle constant, we might need
// to mark the GT_IND as invariant. This is the same as what gtNewIndOfIconHandleNode() does.
// Review: should some kind of more general morphing take care of this?
// Should this share code with gtNewIndOfIconHandleNode()?

if (parent->OperIs(GT_IND) && newTree->IsIconHandle())
{
GenTreeFlags iconFlags = newTree->GetIconHandleFlag();
if (GenTree::HandleKindDataIsInvariant(iconFlags))
{
parent->gtFlags |= GTF_IND_INVARIANT;
if (iconFlags == GTF_ICON_STR_HDL)
{
// String literals are never null
parent->gtFlags |= GTF_IND_NONNULL;
}
}
}
}
else
{
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