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Re: Modifying ARM code generator for elimination of 8bit writes - need help


On Sunday 06 August 2006 02:05, Rask Ingemann Lambertsen wrote:
> Yes, it only cures the symptom, but it could take a lot of time to
> find the cause, and the gain is small, so I think it is OK to leave
> it like this for now.

> This insn was generated from the "reload_outqi" pattern. I don't
> completely understand why it isn't recognized. The (subreg:QI (reg:DI
> 11 fp) 0) part won't be matched by (match_scratch ...), but
> simplify_gen_subreg() should have simplified it to (reg:QI 11 fp)
> since this is one of the main purposes of having
> simplify_(gen_)subreg() in the first place. Try changing
>    operands[3] = simplify_gen_subreg (QImode, operands[2], DImode,
> 0);
> into
>    operands[3] = gen_rtx_REG (QImode, REGNO (operands[2]));
> (in "reload_outqi") and see if that works.

Yes, it works. Kernel and userland are compiling now. I can't find any 
errors in the generated code. Many thanks!


We're back to the times when men were men 
and wrote their own device drivers.

(Linus Torvalds)

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