Hi Ian > > > Can i disable filling/spilling for this register class? > > Sure: make the registers fixed. > > Or look at how the MIPS port handles HI and LO, with particular > reference to mips_secondary_reload_class. > > Ian
what i'm trying to do is to code a backend for a "standard" DLX. Most things work (everything operating on SI,HI,QI types) but i have problems specifically with "long division". I.e. there is something wrong with either "libgcc2.c" (most improbable) or my backend. I thought borrowing the HI/LO concept for passing the remainder/quotient when "emulating" the 64-bit divisions by "[u]divsi3" (which calls udivmoddi4). I have resorted to s'thing like this that doesn't need hi-lo registers. I have t8/t9 fixed for this: return "bnez\t%2,4\n\tbreak\t7\n1:\n\tadd\t%0, $zero, $t8\n\tadd\t%3, $zero, $t9"; (as in MIPS' mips_output_division()) I'll have a look to mips_secondary_reload_class, however now i don't get spilling/filling errors. I have a question: libgcc2.c is pretty stable, right? I mean i shouldn't looking for something going wrong with it. thanks in advance Nikolaos Kavvadias
