2590 cmp(temp_reg, markWord::biased_lock_pattern);
2591 brx(Assembler::equal, allow_delay_slot_filling, Assembler::pt, done);
2592 delayed();
2593 if (!allow_delay_slot_filling) {
2594 nop();
2595 }
2596 }
2597
2598
2599 // compiler_lock_object() and compiler_unlock_object() are direct transliterations
2600 // of i486.ad fast_lock() and fast_unlock(). See those methods for detailed comments.
2601 // The code could be tightened up considerably.
2602 //
2603 // box->dhw disposition - post-conditions at DONE_LABEL.
2604 // - Successful inflated lock: box->dhw != 0.
2605 // Any non-zero value suffices.
2606 // Consider G2_thread, rsp, boxReg, or markWord::unused_mark()
2607 // - Successful Stack-lock: box->dhw == mark.
2608 // box->dhw must contain the displaced mark word value
2609 // - Failure -- icc.ZFlag == 0 and box->dhw is undefined.
2610 // The slow-path fast_enter() and slow_enter() operators
2611 // are responsible for setting box->dhw = NonZero (typically markWord::unused_mark()).
2612 // - Biased: box->dhw is undefined
2613 //
2614 // SPARC refworkload performance - specifically jetstream and scimark - are
2615 // extremely sensitive to the size of the code emitted by compiler_lock_object
2616 // and compiler_unlock_object. Critically, the key factor is code size, not path
2617 // length. (Simply experiments to pad CLO with unexecuted NOPs demonstrte the
2618 // effect).
2619
2620
2621 void MacroAssembler::compiler_lock_object(Register Roop, Register Rmark,
2622 Register Rbox, Register Rscratch,
2623 BiasedLockingCounters* counters,
2624 bool try_bias) {
2625 Address mark_addr(Roop, oopDesc::mark_offset_in_bytes());
2626
2627 verify_oop(Roop);
2628 Label done ;
2629
2630 if (counters != NULL) {
2631 inc_counter((address) counters->total_entry_count_addr(), Rmark, Rscratch);
|
2590 cmp(temp_reg, markWord::biased_lock_pattern);
2591 brx(Assembler::equal, allow_delay_slot_filling, Assembler::pt, done);
2592 delayed();
2593 if (!allow_delay_slot_filling) {
2594 nop();
2595 }
2596 }
2597
2598
2599 // compiler_lock_object() and compiler_unlock_object() are direct transliterations
2600 // of i486.ad fast_lock() and fast_unlock(). See those methods for detailed comments.
2601 // The code could be tightened up considerably.
2602 //
2603 // box->dhw disposition - post-conditions at DONE_LABEL.
2604 // - Successful inflated lock: box->dhw != 0.
2605 // Any non-zero value suffices.
2606 // Consider G2_thread, rsp, boxReg, or markWord::unused_mark()
2607 // - Successful Stack-lock: box->dhw == mark.
2608 // box->dhw must contain the displaced mark word value
2609 // - Failure -- icc.ZFlag == 0 and box->dhw is undefined.
2610 // The slow-path enter() is responsible for setting
2611 // box->dhw = NonZero (typically markWord::unused_mark()).
2612 // - Biased: box->dhw is undefined
2613 //
2614 // SPARC refworkload performance - specifically jetstream and scimark - are
2615 // extremely sensitive to the size of the code emitted by compiler_lock_object
2616 // and compiler_unlock_object. Critically, the key factor is code size, not path
2617 // length. (Simply experiments to pad CLO with unexecuted NOPs demonstrte the
2618 // effect).
2619
2620
2621 void MacroAssembler::compiler_lock_object(Register Roop, Register Rmark,
2622 Register Rbox, Register Rscratch,
2623 BiasedLockingCounters* counters,
2624 bool try_bias) {
2625 Address mark_addr(Roop, oopDesc::mark_offset_in_bytes());
2626
2627 verify_oop(Roop);
2628 Label done ;
2629
2630 if (counters != NULL) {
2631 inc_counter((address) counters->total_entry_count_addr(), Rmark, Rscratch);
|