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Re: splitting addhi, addsi
- From: Pierre Mallard <pierremallard at yahoo dot fr>
- To: diwil at eis dot ru
- Cc: gcc at gcc dot gnu dot org
- Date: Mon, 21 Oct 2002 16:37:46 +0200 (CEST)
- Subject: Re: splitting addhi, addsi
Hi
Ok then looks working good ... until .. :
if ever gcc decide to separate completly the two expr
(add and add_with_carry) and put between it some other
code that change the carry, result will be wrong.
How can I do to make it impossible (i.e. allowed only
expression that do not affect the cc reg between add
and add_with_carry)?
Thanks a lot, Regards
Pierre
--- Dmitry <diwil@eis.ru> a écrit : > HOw about
unspec?
>
> (define_insn "*plus_with_carry"
> [(set (reg:QI XX)
> (unspec:QI [(reg:QI XX) (reg:QI YY)]
> 1234567))]
> "condition"
> "asm_code_for_plus_and_carry %0 %1 %2"
> [attributes])
>
> Then:
> (plus:HI (reg:HI)(reg:HI))
> splits into:
> (plus:QI (reg:QI)(reg:QI))
> (unspec:QI [(reg:QI)(reg:QI)] 1234567)...
>
> ~d
>
>
> On Monday 21 October 2002 11:56, Pierre Mallard
> wrote:
> > Hi,
> > I'm working on the c compiler gcc-3.0.4 to port
> code
> > for my cpu.
> > In order to feel right my delay pipe of 3 slot I
> need
> > to cut every expression in code of one length
> > instruction.
> > So I need to have my addhi and addsi cut with sthg
> > like a define_split or things like this and I need
> to
> > take care of the carry...
> > I'm wondering how I can define a define_insn that
> do
> > not match the pattern of addqi and that realise
> the
> > add_with_carry instruction :
> >
> > (plus:HI (reg:HI)(reg:HI))
> > ->
> > (plus:QI (reg:QI)(reg:QI))
> > (plus_with_carry:QI (reg:QI)(reg:QI))...
> > Thanks,Regards
> > Pierre Mallard
> >
> >
> >
> >
>
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