From: Russ Cox <russcox@gmail.com>
To: Sergey Reva <rs_rlab@mail.ru>,
Fans of the OS Plan 9 from Bell Labs <9fans@cse.psu.edu>
Subject: Re: [9fans] return vlong
Date: Fri, 20 May 2005 11:00:31 -0400 [thread overview]
Message-ID: <ee9e417a050520080026bea02b@mail.gmail.com> (raw)
In-Reply-To: <5114550406.20050520175310@mail.ru>
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 15:00 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 [this message]
2005-05-20 15:07 ` jmk
2005-05-20 15:15 ` C H Forsyth
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