src/hotspot/cpu/aarch64/templateInterpreterGenerator_aarch64.cpp

*** 1059,1070 ****
      return entry;
    }
    return NULL;
  }
  
! // Not supported
  address TemplateInterpreterGenerator::generate_CRC32C_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
    return NULL;
  }
  
  void TemplateInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
    // Bang each page in the shadow zone. We can't assume it's been done for
--- 1059,1106 ----
      return entry;
    }
    return NULL;
  }
  
! /**
!  * Method entry for intrinsic-candidate (non-native) methods:
!  *   int java.util.zip.CRC32C.updateBytes(int crc, byte[] b, int off, int end)
!  *   int java.util.zip.CRC32C.updateDirectByteBuffer(int crc, long buf, int off, int end)
!  * Unlike CRC32, CRC32C does not have any methods marked as native
!  * CRC32C also uses an "end" variable instead of the length variable CRC32 uses
!  */
  address TemplateInterpreterGenerator::generate_CRC32C_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
+   if (UseCRC32Intrinsics) {
+     address entry = __ pc();
+ 
+     // Prepare jump to stub using parameters from the stack
+     const Register crc = c_rarg0; // initial crc
+     const Register buf = c_rarg1; // source java byte array address
+     const Register len = c_rarg2; // len argument to the kernel
+ 
+     const Register end = len; // index of last element to process
+     const Register off = crc; // offset
+ 
+     __ ldrw(end, Address(esp)); // int end
+     __ ldrw(off, Address(esp, wordSize)); // int offset
+     __ sub(len, end, off);
+     __ ldr(buf, Address(esp, 2*wordSize)); // byte[] buf | long buf
+     __ add(buf, buf, off); // + offset
+     if (kind == Interpreter::java_util_zip_CRC32C_updateDirectByteBuffer) {
+       __ ldrw(crc, Address(esp, 4*wordSize)); // long crc
+     } else {
+       __ add(buf, buf, arrayOopDesc::base_offset_in_bytes(T_BYTE)); // + header size
+       __ ldrw(crc, Address(esp, 3*wordSize)); // long crc
+     }
+ 
+     __ andr(sp, r13, -16); // Restore the caller's SP
+ 
+     // Jump to the stub.
+     __ b(CAST_FROM_FN_PTR(address, StubRoutines::updateBytesCRC32C()));
+ 
+     return entry;
+   }
    return NULL;
  }
  
  void TemplateInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
    // Bang each page in the shadow zone. We can't assume it's been done for