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Recognize Thread.onSpinWait() on Power #20907

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Merged
zl-wang merged 1 commit into from
Jan 17, 2025
Merged

Recognize Thread.onSpinWait() on Power #20907

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19 changes: 19 additions & 0 deletions runtime/compiler/p/codegen/J9TreeEvaluator.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -11902,8 +11902,27 @@ J9::Power::CodeGenerator::inlineDirectCall(TR::Node *node, TR::Register *&result
{
bool disableCASInlining = !cg->getSupportsInlineUnsafeCompareAndSet();
bool disableCAEInlining = !cg->getSupportsInlineUnsafeCompareAndExchange();
static bool disableOSW = feGetEnv("TR_noPauseOnSpinWait") != NULL;
switch (methodSymbol->getRecognizedMethod())
{
case TR::java_lang_Thread_onSpinWait:
{
if (!disableOSW)
{
if (comp->getOption(TR_TraceCG))
{
traceMsg(comp, "Inlining Thread.onSpinWait call node %p as yield instruction.\n", node);
}

/*
* onSpinWait() method calls VM_AtomicSupport::yieldCPU() which is a yield instruction encoded as "or r27, r27, r27".
* Check omr/include_core/AtomicSupport.hpp for the JNI implementation.
*/
generateInstruction(cg, TR::InstOpCode::yield, node);
return true;
}
break;
}
case TR::java_util_concurrent_ConcurrentLinkedQueue_tmOffer:
{
if (cg->getSupportsInlineConcurrentLinkedQueue())
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