This is the mail archive of the gcc@gcc.gnu.org mailing list for the GCC project.

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]
Other format:	[Raw text]

Re: -fno-tree-cselim not working?

From: Andreas Schwab <schwab at suse dot de>
To: Ian Lance Taylor <iant at google dot com>
Cc: David Miller <davem at davemloft dot net>, sam at rfc1149 dot net, gcc at gcc dot gnu dot org
Date: Fri, 26 Oct 2007 13:18:22 +0200
Subject: Re: -fno-tree-cselim not working?
References: <87myu7zf9a.fsf@willow.rfc1149.net> <m3y7dqjy2r.fsf@localhost.localdomain> <20071025.214032.174793535.davem@davemloft.net> <m3sl3yjx87.fsf@localhost.localdomain>

Ian Lance Taylor <iant@google.com> writes:

> The above code happens to use pthread_mutex_trylock, but there is no
> need for that.

pthread_mutex_trylock is special, because POSIX says it is a memory
synchronisation point (see section 4.10 Memory Synchronization).

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Follow-Ups:
- Re: -fno-tree-cselim not working?
  - From: Ian Lance Taylor

References:
- -fno-tree-cselim not working?
  - From: Samuel Tardieu
- Re: -fno-tree-cselim not working?
  - From: Ian Lance Taylor
- Re: -fno-tree-cselim not working?
  - From: David Miller
- Re: -fno-tree-cselim not working?
  - From: Ian Lance Taylor

Index Nav:	[Date Index] [Subject Index] [Author Index] [Thread Index]
Message Nav:	[Date Prev] [Date Next]	[Thread Prev] [Thread Next]