src/cpu/x86/vm/x86_64.ad

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*** 6334,6343 **** --- 6334,6362 ---- format %{ "MEMBAR-release (a FastUnlock follows so empty encoding)" %} ins_encode(); ins_pipe(empty); %} + instruct onspinwait() + %{ + match(OnSpinWait); + ins_cost(200); + + format %{ + $$template + if (os::is_MP()) { + $$emit$$"pause\t! membar_onspinwait" + } else { + $$emit$$"MEMBAR-onspinwait ! (empty encoding)" + } + %} + ins_encode %{ + __ pause(); + %} + ins_pipe(pipe_slow); + %} + instruct membar_volatile(rFlagsReg cr) %{ match(MemBarVolatile); effect(KILL cr); ins_cost(400);