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Re: Using local register variable
- From: "Tal Agmon" <Tal dot Agmon at nsc dot com>
- To: gcc-help at gcc dot gnu dot org
- Cc: "Tomer Levi" <Tomer dot Levi at nsc dot com>
- Date: Tue, 30 Dec 2003 20:37:53 +0200
- Subject: Re: Using local register variable
I meant that a5 was used when I defined a pointer foo and it wasn't used
when I defined int y.
"Falk Hueffner"
<falk.hueffner@student.uni-tu To: "Tal Agmon" <Tal.Agmon@nsc.com>
ebingen.de> cc: gcc-help@gcc.gnu.org, "Tomer Levi" <Tomer.Levi@nsc.com>
Subject: Re: Using local register variable
12/30/03 07:13 PM
"Tal Agmon" <Tal.Agmon@nsc.com> writes:
> The manual says:
> You can define a local register variable with a specified register like
> this:
> register int *foo asm ("a5");
>
> My question: is foo must be a pointer or can I define for example:
> register int y asm ("a5");
Both are legal.
> I'm asking this because in gcc-3.3.2 I saw (in a very simple program
> with no reason not the preserve a register) that a5 was not
> preserved for y, and when I defined it as in the first example, a5
> WAS preserved for foo.
I don't understand what you mean by "preserve", so I can't comment on
this...
>
--
Falk