Re: PATCH: Fix ll/sc for mips

["H . J . Lu" <hjl@lucon.org>]

On Fri, Feb 01, 2002 at 12:35:23PM +0900, Hiroyuki Machida wrote:
> > _test_and_set (int *p, int v) __THROW 
> > {
> >   int r, t;
> > 
> >   __asm__ __volatile__
> >     (".set      push\n\t"
> >      ".set      noreorder\n"
> >      "1:\n\t"
> >      "ll        %0,%3\n\t"
> >      "beq       %0,%4,2f\n\t"
> >      "move      %1,%4\n\t"
> >      "sc        %1,%2\n\t"
> >      "beqz      %1,1b\n\t"
> >      "nop\n" 
> >      "2:\n\t"
> >      ".set      pop"    
> >      : "=&r" (r), "=&r" (t), "=m" (*p)
> >      : "m" (*p), "r" (v) 
> >      : "memory");
> > 
> >   return r;
> > }
> 
> Gas will fill delay slots. Same object codes will be produced, so I
> think you don't have to do that by hand. 

It will make the code more readable. We don't have to guess what
the assembler will do. 


H.J.