On Tue, 2008-04-01 at 09:48 +0530, Mohamed Shafi wrote: > What i did was to have 8 register class with each class having two > registers, an even register and an odd register then in define expand > look for the register indirect with offset addressing mode and emit > gen_store_offset or gen_load_offset pattern if the addressing mode is > found.
This sounds similar to what I suggested, so it may work. However, having a separate pattern for certain kinds of loads/stores may not work. reload doesn't re-recognize an insn while it is fixing it, hence you need to have a single movsi (or whatever) pattern that can handle any kind of operand. If you have a movsi pattern that doesn't accept load/store offset, then probably what will happen is that any fp +offset addresses generated during reload will get reloaded into a register, and you may not get very good code. Of course, with your address register restrictions, there is only one register that can be used with fp+offset, so you might not get good code for that regardless of what you do. Jim
