From: jmk@plan9.bell-labs.com
To: russcox@gmail.com, 9fans@cse.psu.edu
Subject: Re: [9fans] return vlong
Date: Fri, 20 May 2005 11:07:44 -0400 [thread overview]
Message-ID: <3658b755213322c8dfc67a2ccb692cca@plan9.bell-labs.com> (raw)
In-Reply-To: <ee9e417a050520080026bea02b@mail.gmail.com>
that's on the 386. other architectures may return the value
in one or two registers.
On Fri May 20 11:01:27 EDT 2005, russcox@gmail.com wrote:
> a call to a function that returns a vlong or structure
> passes an invisible (to the c programmer) first argument
> that is a pointer to somewhere to write the return value.
> so the following two functions have equivalent assembly
> (but different c types):
>
> vlong
> return0(void)
> {
> return 0;
> }
>
> void
> return0(vlong *v)
> {
> *v = 0;
> }
>
> russ
next prev parent reply other threads:[~2005-05-20 15:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-05-20 14:53 Sergey Reva
2005-05-20 15:00 ` Russ Cox
2005-05-20 15:07 ` jmk [this message]
2005-05-20 15:15 ` C H Forsyth
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