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Fold "FrozenObjectHandle(REF) + CNS" to a byref constant #85888

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merged 7 commits into from
May 9, 2023
Merged

Fold "FrozenObjectHandle(REF) + CNS" to a byref constant #85888

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8bdd54b
Fold "FrozenObjectHandle(REF) + CNS" to a byref constant
EgorBo May 7, 2023
3e57605
Address Single's suggestion
EgorBo May 7, 2023
ee2c656
Generalize it
EgorBo May 7, 2023
153cdbb
fix tests
EgorBo May 7, 2023
41cebff
check opts
EgorBo May 7, 2023
e4d0549
Merge branch 'main' of github.com:dotnet/runtime into fold-frozen-obj…
EgorBo May 8, 2023
9e5e43b
clean up
EgorBo May 8, 2023
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16 changes: 16 additions & 0 deletions src/coreclr/jit/lower.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -6247,6 +6247,22 @@ GenTree* Lowering::LowerAdd(GenTreeOp* node)
return next;
}

// Fold "FrozenObjectHandle(REF) + CNS" to a byref constant:
//
// * ADD byref
// +--* CNS_INT(h) ref
// \--* CNS_INT long
//
// We can do this earlier but that will need some efforts (e.g. to restore original object from a
// byref constant for optimizations, be careful with "base constant" CSEs, etc). Also, it can't be
// just enabled for AOT, it needs some way to use reloc + offset then.
if (!comp->opts.IsReadyToRun() && op1->IsIconHandle(GTF_ICON_OBJ_HDL) && op2->IsCnsIntOrI())
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{
BlockRange().Remove(op1);
BlockRange().Remove(op2);
node->BashToConst(op1->AsIntCon()->IconValue() + op2->AsIntCon()->IconValue(), TYP_BYREF);
}

#ifdef TARGET_XARCH
if (BlockRange().TryGetUse(node, &use))
{
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