int offset = local0Offset - ((bitnum -1 -1) <<LOG_BYTES_IN_ADDRESS);
int offset = startLocal0Offset - ((bitnum -1) <<LOG_BYTES_IN_ADDRESS);
  private int convertBitNumToOffset(int bitnum)   {    // local0Offset is the distance from the frame pointer to the first local word    //   it includes the Linkage area ( 12 bytes)    //               the Local area and    //               the Java operand stack area    //               and possibly a parameter spill area    // convert from top of local words    int offset = local0Offset - ((bitnum -1 -1) <<LOG_BYTES_IN_ADDRESS); // minus 1 for being 1 based, minus 1 for jsrbit    if (VM.TraceStkMaps) {      VM.sysWriteln("convertBitnumToOffset- bitnum = ", bitnum, "  offset = ", offset);    }    return offset;  }