How can I create a const rtx other than 0, 1, 2

[Liu Haibin]

Hi,

There's const0_rtx, const1_rtx and const2_rtx. How can I create a
const rtx other than 0, 1, 2? I want to use it in md file, like

operand[1] = 111.

I know I must use const rtx here. How can I do it? A simple question,
but just no idea where to find the answer.


Regards,
Timothy