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From: Cong Wang <xiyou.wangcong@gmail.com>
To: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
	linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 1/4] compiler.h: introduce unused_expression() macro
Date: Wed, 25 Apr 2012 19:51:44 +0800	[thread overview]
Message-ID: <4F97E550.4060208@gmail.com> (raw)
In-Reply-To: <20120425112623.26927.43229.stgit@zurg>

On 04/25/2012 07:26 PM, Konstantin Khlebnikov wrote:
> Sometimes we want to check some expressions correctness in compile-time without
> generating extra code. "(void)(e)" does not work if expression has side-effects.
> This patch introduces macro unused_expression() which helps in this situation.
>

Interesting, I am wondering why gcc doesn't eliminate the code as we 
pass either -O2 or -Os to it.

  parent reply	other threads:[~2012-04-25 11:51 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-04-25 11:26 [PATCH 1/4] compiler.h: introduce unused_expression() macro Konstantin Khlebnikov
2012-04-25 11:26 ` [PATCH 2/4] bug: completely remove code of disabled VM_BUG_ON() Konstantin Khlebnikov
2012-04-25 14:40   ` Geert Uytterhoeven
2012-04-26 22:32     ` Andrew Morton
2012-04-27  5:17       ` Geert Uytterhoeven
2012-04-27  7:07         ` Andrew Morton
2012-04-25 11:26 ` [PATCH 3/4] bug: completely remove code of disabled BUG_ON() Konstantin Khlebnikov
2012-04-25 11:26 ` [PATCH 4/4] bug: mark disabled BUG() as unreachable() code Konstantin Khlebnikov
2012-04-28  5:10   ` Konstantin Khlebnikov
2012-04-28  5:21     ` Linus Torvalds
2012-04-28  6:14     ` Andrew Morton
2012-04-25 11:51 ` Cong Wang [this message]
2012-04-25 11:54   ` [PATCH 1/4] compiler.h: introduce unused_expression() macro Konstantin Khlebnikov
2012-04-26 22:29 ` Andrew Morton
2012-04-27  9:55   ` Konstantin Khlebnikov
2012-04-27 21:53     ` Andrew Morton
2012-04-26 22:34 ` Andrew Morton
2012-04-27  7:54   ` Konstantin Khlebnikov
2012-04-27  8:16 ` H. Peter Anvin
2012-04-28  3:50   ` Konstantin Khlebnikov
2012-04-28  7:06 ` [PATCH v2 1/2] bug: introduce BUILD_BUG_ON_INVALID() macro Konstantin Khlebnikov
2012-04-28  7:06   ` Konstantin Khlebnikov
2012-04-28  7:06 ` [PATCH v2 2/2] bug: completely remove code of disabled VM_BUG_ON() Konstantin Khlebnikov
2012-04-28  7:06   ` Konstantin Khlebnikov

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