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From: Eljay Love-Jensen <eljay@adobe.com>
To: Vincent Mayeski <mayeski@gmail.com>
Cc: GCC-help <gcc-help@gcc.gnu.org>
Subject: Re: how to pass params to inline functions by reference or value?
Date: Thu, 10 Apr 2008 15:11:00 -0000	[thread overview]
Message-ID: <C4238234.3873%eljay@adobe.com> (raw)
In-Reply-To: <1207832200.12695.22.camel@vm-laptop>

Hi Vincent,

> However, IF the function is inlined, no copying should actually take
> place because the arg is not modified within the function. My guess is
> that [#1] these will produce identical code.

Is the context C++ or C?

For C++, that [#1] is incorrect for non-regular types, and likely incorrect
for regular types.  (But for C++ you probably should use a const& for the
inline function's parm, which would do what you want.)

For C, I'm not sure, but I suspect that [#1] is incorrect.

What happens when you test compile the two variants with --save-temps and
-O2, and look at the resulting .s files?

HTH,
--Eljay

  parent reply	other threads:[~2008-04-10 13:37 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-04-10  5:55 VM
2008-04-10 13:32 ` Ted Byers
2008-04-10 13:37   ` Vincent Mayeski
2008-04-10 14:45     ` Ted Byers
2008-04-10 15:11     ` Eljay Love-Jensen [this message]
2008-04-10 15:37       ` Vincent Mayeski
2008-04-10 21:39         ` Tony Wetmore
2008-04-10 15:33 ` John Fine
2008-04-11 11:57   ` Brian Dessent

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