daniel tian <daniel.xnt...@gmail.com> writes: > There is a problem I encountered. I port gcc to 32bit RISC. The > LOAD/STORE only has 8bit displacement. If the immediate displacement > larger than 256, the displacement must be force into register. In > addition, if the immediate is larger than 512, it can only move into > one specified register R0. > > Like: > > LW R2 (R1) #252 ;; means R2 = Mem(R1 + 255) > > LW R2 (R1) #508;; it is wrong. immediate 508 should force into > register first. > > > LW R2 (R1) #0x500;; it is wrong, immediate 0x500 should force into > register R0 first. > > Now, for immediate movement, it is achieved to move large immediate. > But I don't know how to make the address mode legitimate. Now I try to > add the code in LEGITIMIZE_RELOAD_ADDRESS like sh.md, or arm.md. But > cc1 still crashed, when the frame size is larger than 255. Do I miss > something?
I would fix this in LEGITIMIZE_RELOAD_ADDRESS or in TARGET_SECONDARY_RELOAD. I don't know why cc1 crashed, you will have to debug that. Ian
