From: Arnd Bergmann <arnd@arndb.de>
To: "H. Peter Anvin" <hpa@zytor.com>, Linus Torvalds <torvalds@osdl.org>
Cc: Jamie Lokier <jamie@shareable.org>,
Nikita Danilov <Nikita@Namesys.COM>,
linux-kernel@vger.kernel.org
Subject: Re: const versus __attribute__((const))
Date: Tue, 9 Dec 2003 12:56:47 +0100 [thread overview]
Message-ID: <200312091256.47414.arnd@arndb.de> (raw)
In-Reply-To: <3FD57C77.4000403@zytor.com>
On Tuesday 09 December 2003 08:40, H. Peter Anvin wrote:
> Well, I get no warning from the following code, with gcc 3.2.2 and -W
> -Wall:
>
> int foo(int x)
> {
> int y, z, w;
>
> asm("movl %1,%0" : "=r" (y) : "r" (x));
> asm("movl %1,%0" : "=r" (z) : "m" (y+1));
> asm("movl %1,%0" : "=r" (w) : "m" (33));
>
> return z+w;
> }
For reference, both gcc-3.3 and gcc-3.4 (snapshot) give produce the same assembly
as gcc-3.2 for your code, but give this warning:
test.c:6: warning: use of memory input without lvalue in asm operand 1 is deprecated
test.c:7: warning: use of memory input without lvalue in asm operand 1 is deprecated
Arnd <><
next prev parent reply other threads:[~2003-12-09 11:59 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-08 15:46 const versus __attribute__((const)) Arnd Bergmann
2003-12-08 17:50 ` H. Peter Anvin
2003-12-08 18:27 ` Nikita Danilov
2003-12-08 18:31 ` H. Peter Anvin
2003-12-09 2:59 ` Jamie Lokier
2003-12-09 3:21 ` H. Peter Anvin
2003-12-09 3:49 ` Jamie Lokier
2003-12-09 5:37 ` H. Peter Anvin
2003-12-09 7:26 ` Linus Torvalds
2003-12-09 7:40 ` H. Peter Anvin
2003-12-09 11:56 ` Arnd Bergmann [this message]
2003-12-09 15:42 ` H. Peter Anvin
2003-12-09 16:44 ` Linus Torvalds
2003-12-09 16:51 ` H. Peter Anvin
2003-12-09 19:15 ` Jamie Lokier
2003-12-09 7:19 ` Linus Torvalds
-- strict thread matches above, loose matches on Subject: below --
2003-12-08 1:19 H. Peter Anvin
2003-12-08 12:32 ` Nikita Danilov
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