src/cpu/x86/vm/stubGenerator_x86_64.cpp

*** 1,7 ****
  /*
!  * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
--- 1,7 ----
  /*
!  * Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.
*** 3582,3592 ****
--- 3582,3630 ----
      __ jmp(L_exit);
  
      return start;
    }
  
+   /**
+    *  Arguments:
+    *
+    * Inputs:
+    *   c_rarg0   - int crc
+    *   c_rarg1   - byte* buf
+    *   c_rarg2   - int length
+    *
+    * Ouput:
+    *       rax   - int crc result
+    */
+   address generate_updateBytesCRC32() {
+     assert(UseCRC32Intrinsics, "need AVX and CLMUL instructions");
+ 
+     __ align(CodeEntryAlignment);
+     StubCodeMark mark(this, "StubRoutines", "updateBytesCRC32");
  
+     address start = __ pc();
+     // Win64: rcx, rdx, r8, r9 (c_rarg0, c_rarg1, ...)
+     // Unix:  rdi, rsi, rdx, rcx, r8, r9 (c_rarg0, c_rarg1, ...)
+     // rscratch1: r10
+     const Register crc   = c_rarg0;  // crc
+     const Register buf   = c_rarg1;  // source java byte array address
+     const Register len   = c_rarg2;  // length
+     const Register table = c_rarg3;  // crc_table address (reuse register)
+     const Register tmp   = r11;
+     assert_different_registers(crc, buf, len, table, tmp, rax);
+ 
+     BLOCK_COMMENT("Entry:");
+     __ enter(); // required for proper stackwalking of RuntimeStub frame
+ 
+     __ kernel_crc32(crc, buf, len, table, tmp);
+ 
+     __ movl(rax, crc);
+     __ leave(); // required for proper stackwalking of RuntimeStub frame
+     __ ret(0);
+ 
+     return start;
+   }
  
  #undef __
  #define __ masm->
  
    // Continuation point for throwing of implicit exceptions that are
*** 3734,3743 ****
--- 3772,3786 ----
      StubRoutines::_throw_StackOverflowError_entry =
        generate_throw_exception("StackOverflowError throw_exception",
                                 CAST_FROM_FN_PTR(address,
                                                  SharedRuntime::
                                                  throw_StackOverflowError));
+     if (UseCRC32Intrinsics) {
+       // set table address before stub generation which use it
+       StubRoutines::_crc_table_adr = (address)StubRoutines::x86::_crc_table;
+       StubRoutines::_updateBytesCRC32 = generate_updateBytesCRC32();
+     }
    }
  
    void generate_all() {
      // Generates all stubs and initializes the entry points