src/cpu/aarch64/vm/aarch64.ad

rev 10278 : 8150394: aarch64: add support for 8.1 LSE CAS instructions
Reviewed-by: duke
Contributed-by: ananth.jasty@caviumnetworks.com, edward.nevill@gmail.com

*** 4677,4687 ****
      // Initialize the box. (Must happen before we update the object mark!)
      __ str(disp_hdr, Address(box, BasicLock::displaced_header_offset_in_bytes()));
  
      // Compare object markOop with mark and if equal exchange scratch1
      // with object markOop.
!     {
        Label retry_load;
        __ bind(retry_load);
        __ ldaxr(tmp, oop);
        __ cmp(tmp, disp_hdr);
        __ br(Assembler::NE, cas_failed);
--- 4677,4692 ----
      // Initialize the box. (Must happen before we update the object mark!)
      __ str(disp_hdr, Address(box, BasicLock::displaced_header_offset_in_bytes()));
  
      // Compare object markOop with mark and if equal exchange scratch1
      // with object markOop.
!     if (UseLSE) {
!       __ mov(tmp, disp_hdr);
!       __ casal(disp_hdr, box, oop);
!       __ cmp(tmp, disp_hdr);
!       __ br(Assembler::EQ, cont);
!     } else {
        Label retry_load;
        __ bind(retry_load);
        __ ldaxr(tmp, oop);
        __ cmp(tmp, disp_hdr);
        __ br(Assembler::NE, cas_failed);
*** 4727,4737 ****
        //
        // Try to CAS m->owner from NULL to current thread.
        __ add(tmp, disp_hdr, (ObjectMonitor::owner_offset_in_bytes()-markOopDesc::monitor_value));
        __ mov(disp_hdr, zr);
  
!       {
          Label retry_load, fail;
          __ bind(retry_load);
          __ ldaxr(rscratch1, tmp);
          __ cmp(disp_hdr, rscratch1);
          __ br(Assembler::NE, fail);
--- 4732,4746 ----
        //
        // Try to CAS m->owner from NULL to current thread.
        __ add(tmp, disp_hdr, (ObjectMonitor::owner_offset_in_bytes()-markOopDesc::monitor_value));
        __ mov(disp_hdr, zr);
  
!       if (UseLSE) {
!         __ mov(rscratch1, disp_hdr);
!         __ casal(disp_hdr, rthread, tmp);
!         __ cmp(rscratch1, disp_hdr);
!       } else {
          Label retry_load, fail;
          __ bind(retry_load);
          __ ldaxr(rscratch1, tmp);
          __ cmp(disp_hdr, rscratch1);
          __ br(Assembler::NE, fail);
*** 4816,4826 ****
  
      // Check if it is still a light weight lock, this is is true if we
      // see the stack address of the basicLock in the markOop of the
      // object.
  
!       {
          Label retry_load;
          __ bind(retry_load);
          __ ldxr(tmp, oop);
          __ cmp(box, tmp);
          __ br(Assembler::NE, cas_failed);
--- 4825,4839 ----
  
      // Check if it is still a light weight lock, this is is true if we
      // see the stack address of the basicLock in the markOop of the
      // object.
  
!       if (UseLSE) {
!         __ mov(tmp, box);
!         __ casl(box, disp_hdr, oop);
!         __ cmp(tmp, box);
!       } else {
          Label retry_load;
          __ bind(retry_load);
          __ ldxr(tmp, oop);
          __ cmp(box, tmp);
          __ br(Assembler::NE, cas_failed);