From owner-freebsd-sparc  Sun Dec 27 11:15:32 1998
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	Sun, 27 Dec 1998 01:47:49 -0300 (ART)
From: "Fernando P. Schapachnik" <fpscha@localhost.schapachnik.com.ar>
Message-Id: <199812270447.BAA00291@localhost.schapachnik.com.ar>
Subject: Re: Cross compiled code
In-Reply-To: <Pine.BSF.4.05.9812220941370.6331-100000@bright.fx.genx.net> from Alfred Perlstein at "Dec 22, 98 09:45:37 am"
To: bright@hotjobs.com (Alfred Perlstein)
Date: Sun, 27 Dec 1998 01:47:49 -0300 (ART)
Cc: paipai@tin.it, freebsd-sparc@FreeBSD.ORG
Reply-To: fpscha@schapachnik.com.ar
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En un mensaje anterior Alfred Perlstein escribió:
> > ----- the original program prova.c (c code) -------
> > 
> > 
> > main(){
> >  int a,b;
> > 
> >  a = 10;
> >  b = 20 + a;
> > }
> > 
> > --------------------------------------------
> > 
> > compiled with xgcc -S 
> > 
> > --------------------------------------------
> >  .file	"prova.c"
> > .section	".text"
> >  .align 4
> >  .global main
> >  .type	 main,#function
> >  .proc	04
> > main:
> >  !#PROLOGUE# 0
> >  save %sp,-208,%sp	! adjust stack fram
> >  !#PROLOGUE# 1
> >  mov 10,%o0		! a = 10
> >  st %o0,[%fp+2027]	! this looks fishy 2027 looks a bit high(*)
> >  ld [%fp+2027],%o0	! fishy (*)
> >  add %o0,20,%o1	! a + 20 -> 
> >  st %o1,[%fp+2023]	! fishy (*)

The compiler is saving a and b in memory because they are atomic 
variables and it's asumming something like "every atomic variable must 
reside in memory, except when explicitly stated register".

You should try compiling with -O.

Regards and happy new year!

> > .LL1:
> >  return %i7+8
> >  nop
> > .LLfe1:
> >  .size	 main,.LLfe1-main
> >  .ident	"GCC: (GNU) egcs-2.91.60 19981201 (egcs-1.1.1 release)"
> > 
> > ---------------------------------------------------------------



Fernando P. Schapachnik
fernando@schapachnik.com.ar

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