mn10200/mn10300/AM33: minor space savings

[J. Johnston]

Alexandre Oliva wrote:
> 
> This patch reduces the jmp_buf size to its minimum on mn10200 and
> mn10300, and uses post-increment addressing modes on AM33, when saving
> and restoring extended registers, which reduces the code size.  Ok to
> install?
> 
>  

Yes.

-- Jeff J.

----------------------------------------------------------------------------------------------------
> Index: newlib/ChangeLog
> by  Alexandre Oliva  <aoliva@cygnus.com>
> 
>         * libc/include/machine/setjmp.h (_JBLEN, mn10200, mn10300):
>         Set to 6.
>         (_JBLEN, AM33): Reset to 10.
>         * libc/machine/mn10300/setjmp.S (setjmp, longjmp): Use
>         post-increment when it is worth it, spacewise.
> 
> Index: newlib/libc/include/machine/setjmp.h
> ===================================================================
> RCS file: /cvs/cvsfiles/devo/newlib/libc/include/machine/setjmp.h,v
> retrieving revision 1.56
> diff -u -r1.56 setjmp.h
> --- newlib/libc/include/machine/setjmp.h        1999/11/18 22:34:25     1.56
> +++ newlib/libc/include/machine/setjmp.h        2000/04/26 05:38:28
> @@ -108,8 +108,11 @@
>  #endif
> 
>  #if defined(__mn10300__) || defined(__mn10200__)
> -/* A guess */
> +#define _JBLEN 6
> +#ifdef __AM33__
> +#undef _JBLEN
>  #define _JBLEN 10
> +#endif
>  #endif
> 
>  #ifdef __v850
> Index: newlib/libc/machine/mn10300/setjmp.S
> ===================================================================
> RCS file: /cvs/cvsfiles/devo/newlib/libc/machine/mn10300/setjmp.S,v
> retrieving revision 1.5
> diff -u -r1.5 setjmp.S
> --- newlib/libc/machine/mn10300/setjmp.S        1999/12/02 00:41:13     1.5
> +++ newlib/libc/machine/mn10300/setjmp.S        2000/04/26 05:38:29
> @@ -17,10 +17,11 @@
>         mov sp,a1
>         mov a1,(20,a0)
>  #ifdef __AM33__
> -       mov r4,(24,a0)
> -       mov r5,(28,a0)
> -       mov r6,(32,a0)
> -       mov r7,(36,a0)
> +       add 24,a0
> +       mov r4,(a0+)
> +       mov r5,(a0+)
> +       mov r6,(a0+)
> +       mov r7,(a0+)
>  #endif
>          sub d0,d0
>         rets
> @@ -37,10 +38,11 @@
>         mov (20,a0),a1
>         mov a1,sp
>  #ifdef __AM33__
> -       mov (24,a0),r4
> -       mov (28,a0),r5
> -       mov (32,a0),r6
> -       mov (36,a0),r7
> +       add 24,a0
> +       mov (a0+),r4
> +       mov (a0+),r5
> +       mov (a0+),r6
> +       mov (a0+),r7
>  #endif
>         cmp 0,d1
>         bne L1
> 
>   ----------------------------------------------------------------------------------------------------
> 
> --
> Alexandre Oliva    Enjoy Guaraná, see http://www.ic.unicamp.br/~oliva/
> Cygnus Solutions, a Red Hat company        aoliva@{redhat, cygnus}.com
> Free Software Developer and Evangelist    CS PhD student at IC-Unicamp
> oliva@{lsd.ic.unicamp.br, gnu.org}   Write to mailing lists, not to me