From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Luca Barbieri <ldb@ldb.ods.org>
Cc: Roman Zippel <zippel@linux-m68k.org>,
Linux-Kernel ML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] [2.5] asm-generic/atomic.h and changes to arm, parisc, mips, m68k, sh, cris to use it
Date: 09 Aug 2002 01:11:11 +0100 [thread overview]
Message-ID: <1028851871.28883.126.camel@irongate.swansea.linux.org.uk> (raw)
In-Reply-To: <1028846417.1669.95.camel@ldb>
On Thu, 2002-08-08 at 23:40, Luca Barbieri wrote:
> > The compiler can cache the value in a register
> It shouldn't since it is volatile and the machine has instructions with
> memory operands.
I'm curious what part of C99 guarantees that it must generate
add 1 to memory
not
load memory
add 1
store memory
It certainly guarantees not to cache it for use next statement, but does
it actually persuade the compiler to use direct operations on memory ?
I'm not a C99 language lawyer but genuinely curious
next prev parent reply other threads:[~2002-08-08 22:51 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-08 21:43 Luca Barbieri
2002-08-08 21:58 ` Roman Zippel
2002-08-08 22:11 ` Luca Barbieri
2002-08-08 22:27 ` Roman Zippel
2002-08-08 22:40 ` Luca Barbieri
2002-08-08 23:04 ` Roman Zippel
2002-08-09 0:11 ` Alan Cox [this message]
2002-08-08 23:09 ` Luca Barbieri
2002-08-09 3:52 ` H. Peter Anvin
2002-08-08 23:45 ` Alan Cox
2002-08-12 11:16 ` David Woodhouse
2002-08-12 12:03 ` Luca Barbieri
2002-08-08 23:29 ` Russell King
2002-08-09 0:41 ` [PATCH] [2.5] (v2) " Luca Barbieri
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