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Fold MethodHandleImpl.isCompileConstant #23540

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Merged
mpirvu merged 1 commit into from
Jun 22, 2026
+18 −0
Merged

Fold MethodHandleImpl.isCompileConstant #23540

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1 change: 1 addition & 0 deletions runtime/compiler/optimizer/InlinerTempForJ9.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5731,6 +5731,7 @@ TR_InlinerFailureReason TR_J9InlinerPolicy::checkIfTargetInlineable(TR_CallTarge
case TR::java_lang_invoke_MethodHandle_asType:
case TR::java_lang_invoke_Invokers_checkVarHandleGenericType:
case TR::java_lang_invoke_Invokers_checkGenericType:
case TR::java_lang_invoke_MethodHandleImpl_isCompileConstant:
return DontInline_Callee;
default:
break;
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17 changes: 17 additions & 0 deletions runtime/compiler/optimizer/J9ValuePropagation.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2234,7 +2234,24 @@ void J9::ValuePropagation::constrainRecognizedMethod(TR::Node *node)
}
break;
}
case TR::java_lang_invoke_MethodHandleImpl_isCompileConstant: {
TR::Node *mhNode = node->getFirstChild();
bool isGlobal;
logprintf(trace(), log, "Trying to fold MethodHandleImpl.isCompileConstant\n");
TR::VPConstraint *mhConstraint = getConstraint(mhNode, isGlobal);
if (mhConstraint && mhConstraint->getKnownObject() && mhConstraint->isNonNullObject()) {
transformCallToIconstInPlaceOrInDelayedTransformations(_curTree, 1, isGlobal, true, false);
logprintf(trace(), log, "MethodHandleImpl.isCompileConstant folded to true\n");
return;
}

if (!lastTimeThrough())
return;

transformCallToIconstInPlaceOrInDelayedTransformations(_curTree, 0, isGlobal, true, false);
logprintf(trace(), log, "MethodHandleImpl.isCompileConstant folded to false\n");
break;
}
default:
break;
}
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