[Crash-utility] right shift of the subtraction result

Hi Dave, Does this sound like a bug, it need right shift of the subtraction result, crash-git> pd (678324157984276 >> 32)$10 = 157934crash-git> pd ((681670518181331-678324157984276) >> 32)p: gdb request failed: p ((681670518181331-678324157984276)crash-git>  It might be lacking support of some advanced arithmetic, so what is a proper wayto do some arithmetic like this?