This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.

Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]
Other format: [Raw text]

Re: [cft] subreg validation round 2

> > How did you address the problem with SPARC splitters?
>
> @@ -3674,14 +3676,15 @@ simplify_subreg (enum machine_mode outer
>        && subreg_offset_representable_p (REGNO (op), innermode,
>  					byte, outermode))
>      {
> -      rtx tem = gen_rtx_SUBREG (outermode, op, byte);
> -      int final_regno = subreg_hard_regno (tem, 0);
> +      unsigned int regno = REGNO (op);
> +      unsigned int final_regno
> +	= regno + subreg_regno_offset (regno, innermode, byte, outermode);

Ouch!  Pretty deeply buried in the subreg handling stuff.

Would you see any advantage in manually building the hard regs within the 
splitters?

-- 
Eric Botcazou
Index Nav: [Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav: [Date Prev] [Date Next] [Thread Prev] [Thread Next]