2546     is_64bit = true;
2547   } else if (op->code() == lir_cas_int || op->code() == lir_cas_obj) {
2548     cmp_value = op->cmp_value()->as_register();
2549     new_value = op->new_value()->as_register();
2550     if (op->code() == lir_cas_obj) {
2551       if (UseCompressedOops) {
2552         Register t1 = op->tmp1()->as_register();
2553         Register t2 = op->tmp2()->as_register();
2554         cmp_value = __ encode_heap_oop(t1, cmp_value);
2555         new_value = __ encode_heap_oop(t2, new_value);
2556       } else {
2557         is_64bit = true;
2558       }
2559     }
2560   } else {
2561     Unimplemented();
2562   }
2563 
2564   if (is_64bit) {
2565     __ cmpxchgd(BOOL_RESULT, /*current_value=*/R0, cmp_value, new_value, addr,
2566                 MacroAssembler::MemBarFenceAfter,
2567                 MacroAssembler::cmpxchgx_hint_atomic_update(),
2568                 noreg, NULL, /*check without ldarx first*/true);
2569   } else {
2570     __ cmpxchgw(BOOL_RESULT, /*current_value=*/R0, cmp_value, new_value, addr,
2571                 MacroAssembler::MemBarFenceAfter,
2572                 MacroAssembler::cmpxchgx_hint_atomic_update(),
2573                 noreg, /*check without ldarx first*/true);






2574   }
2575 }
2576 
2577 
2578 void LIR_Assembler::set_24bit_FPU() {
2579   Unimplemented();
2580 }
2581 
2582 void LIR_Assembler::reset_FPU() {
2583   Unimplemented();
2584 }
2585 
2586 
2587 void LIR_Assembler::breakpoint() {
2588   __ illtrap();
2589 }
2590 
2591 
2592 void LIR_Assembler::push(LIR_Opr opr) {
2593   Unimplemented();

2546     is_64bit = true;
2547   } else if (op->code() == lir_cas_int || op->code() == lir_cas_obj) {
2548     cmp_value = op->cmp_value()->as_register();
2549     new_value = op->new_value()->as_register();
2550     if (op->code() == lir_cas_obj) {
2551       if (UseCompressedOops) {
2552         Register t1 = op->tmp1()->as_register();
2553         Register t2 = op->tmp2()->as_register();
2554         cmp_value = __ encode_heap_oop(t1, cmp_value);
2555         new_value = __ encode_heap_oop(t2, new_value);
2556       } else {
2557         is_64bit = true;
2558       }
2559     }
2560   } else {
2561     Unimplemented();
2562   }
2563 
2564   if (is_64bit) {
2565     __ cmpxchgd(BOOL_RESULT, /*current_value=*/R0, cmp_value, new_value, addr,
2566                 MacroAssembler::MemBarNone,
2567                 MacroAssembler::cmpxchgx_hint_atomic_update(),
2568                 noreg, NULL, /*check without ldarx first*/true);
2569   } else {
2570     __ cmpxchgw(BOOL_RESULT, /*current_value=*/R0, cmp_value, new_value, addr,
2571                 MacroAssembler::MemBarNone,
2572                 MacroAssembler::cmpxchgx_hint_atomic_update(),
2573                 noreg, /*check without ldarx first*/true);
2574   }
2575 
2576   if (support_IRIW_for_not_multiple_copy_atomic_cpu) {
2577     __ isync();
2578   } else {
2579     __ sync();
2580   }
2581 }
2582 
2583 
2584 void LIR_Assembler::set_24bit_FPU() {
2585   Unimplemented();
2586 }
2587 
2588 void LIR_Assembler::reset_FPU() {
2589   Unimplemented();
2590 }
2591 
2592 
2593 void LIR_Assembler::breakpoint() {
2594   __ illtrap();
2595 }
2596 
2597 
2598 void LIR_Assembler::push(LIR_Opr opr) {
2599   Unimplemented();