[PATCH] SPARC: Clarify -mapp-regs option

[Eric Botcazou]

> gcc/ChangeLog
> 2014-03-08  Sebastian Huber  <sebastian.huber@embedded-brains.de>
> 
> 	* doc/invoke.texi (mapp-regs): Clarify.

OK modulo:

> diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
> index 2ee091a..12b43fa 100644
> --- a/gcc/doc/invoke.texi
> +++ b/gcc/doc/invoke.texi
> @@ -20818,7 +20818,8 @@ These @samp{-m} options are supported on the SPARC:
>  @opindex mapp-regs
>  Specify @option{-mapp-regs} to generate output using the global registers
>  2 through 4, which the SPARC SVR4 ABI reserves for applications.  This
> -is the default.
> +is the default.  Like the global register 1 the global registers 2 through4
> +are used as volatile registers (may be destroyed across a function
> call).

I personally don't like the "volatile" wording much, please reuse the wording 
of the -fcall-used-REG option.

-- 
Eric Botcazou