src/cpu/x86/vm/sharedRuntime_x86_64.cpp

rev 5968 : 8031320: Use Intel RTM instructions for locks
Summary: Use RTM for inflated locks and stack locks.
Reviewed-by: iveresov, twisti, roland, dcubed

*** 2008,2017 ****
--- 2008,2024 ----
    __ subptr(rsp, stack_size - 2*wordSize);
  
    // Frame is now completed as far as size and linkage.
    int frame_complete = ((intptr_t)__ pc()) - start;
  
+     if (UseRTMLocking) {
+       // Abort RTM transaction before calling JNI
+       // because critical section will be large and will be
+       // aborted anyway. Also nmethod could be deoptimized.
+       __ xabort(0);
+     }
+ 
  #ifdef ASSERT
      {
        Label L;
        __ mov(rax, rsp);
        __ andptr(rax, -16); // must be 16 byte boundary (see amd64 ABI)
*** 3608,3617 ****
--- 3615,3629 ----
  
    assert(SimpleRuntimeFrame::framesize % 4 == 0, "sp not 16-byte aligned");
  
    address start = __ pc();
  
+   if (UseRTMLocking) {
+     // Abort RTM transaction before possible nmethod deoptimization.
+     __ xabort(0);
+   }
+ 
    // Push self-frame.  We get here with a return address on the
    // stack, so rsp is 8-byte aligned until we allocate our frame.
    __ subptr(rsp, SimpleRuntimeFrame::return_off << LogBytesPerInt); // Epilog!
  
    // No callee saved registers. rbp is assumed implicitly saved
*** 3788,3797 ****
--- 3800,3816 ----
    address call_pc = NULL;
    int frame_size_in_words;
    bool cause_return = (poll_type == POLL_AT_RETURN);
    bool save_vectors = (poll_type == POLL_AT_VECTOR_LOOP);
  
+   if (UseRTMLocking) {
+     // Abort RTM transaction before calling runtime
+     // because critical section will be large and will be
+     // aborted anyway. Also nmethod could be deoptimized.
+     __ xabort(0);
+   }
+ 
    // Make room for return address (or push it again)
    if (!cause_return) {
      __ push(rbx);
    }