src/hotspot/cpu/x86/stubGenerator_x86_64.cpp

*** 5263,5272 ****
--- 5263,5325 ----
      __ ret(0);
  
      return start;
    }
  
+   address generate_setBit() {
+     StubCodeMark mark(this, "StubRoutines", "setBit");
+ 
+     return generate_bit(true);
+   }
+ 
+   address generate_clrBit() {
+     StubCodeMark mark(this, "StubRoutines", "clrBit");
+ 
+     return generate_bit(false);
+   }
+ 
+   /**
+    *  Arguments:
+    *
+    * Inputs:
+    *   c_rarg0   - byte[] bits
+    *   c_rarg1   - int index
+    */
+   address generate_bit(bool set) {
+     address start = __ pc();
+ 
+     __ enter(); // required for proper stackwalking of RuntimeStub frame
+ 
+     const Register bits  = c_rarg0;
+     const Register index = c_rarg1;
+ 
+     Label L_return;
+ 
+     __ movl(rbx, index);
+     __ movptr(rdx, bits);
+ 
+     __ movl(rcx, rbx);
+     __ shrl(rbx, 3); // hi
+     __ andl(rcx, 0x7); // lo
+ 
+     __ null_check(rdx, arrayOopDesc::length_offset_in_bytes());
+     __ cmpl(rbx, Address(rdx, arrayOopDesc::length_offset_in_bytes()));
+     __ jccb(Assembler::aboveEqual, L_return); // TODO throw exception?
+ 
+     __ lock();
+     if (set)
+       __ btsl(Address(rdx, rbx, Address::times_1, arrayOopDesc::base_offset_in_bytes(T_BYTE)), rcx);
+     else
+       __ btrl(Address(rdx, rbx, Address::times_1, arrayOopDesc::base_offset_in_bytes(T_BYTE)), rcx);
+ 
+     __ bind(L_return);
+     __ leave(); // required for proper stackwalking of RuntimeStub frame
+     __ ret(0);
+ 
+     return start;
+   }
+ 
    address generate_libmExp() {
      StubCodeMark mark(this, "StubRoutines", "libmExp");
  
      address start = __ pc();
  
*** 5734,5743 ****
--- 5787,5802 ----
          StubRoutines::_dcos = generate_libmCos();
        }
        if (vmIntrinsics::is_intrinsic_available(vmIntrinsics::_dtan)) {
          StubRoutines::_dtan = generate_libmTan();
        }
+       if (vmIntrinsics::is_intrinsic_available(vmIntrinsics::_setBit)) {
+         StubRoutines::_setBit = generate_setBit();
+       }
+       if (vmIntrinsics::is_intrinsic_available(vmIntrinsics::_clrBit)) {
+         StubRoutines::_clrBit = generate_clrBit();
+       }
      }
    }
  
    void generate_all() {
      // Generates all stubs and initializes the entry points