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: [PATCH] Speed up __sync_lock_test_and_set on PowerPC

From: Richard Henderson <rth at redhat dot com>
To: David Edelsohn <dje dot gcc at gmail dot com>
Cc: Anton Blanchard <anton at samba dot org>, gcc at gcc dot gnu dot org
Date: Wed, 03 Sep 2008 12:40:04 -0700
Subject: Re: [PATCH] Speed up __sync_lock_test_and_set on PowerPC
References: <20080903070614.GA14724@kryten> <303e1d290809031234m54a3e19ax1f1c86ed2978b589@mail.gmail.com>

David Edelsohn wrote:

On Wed, Sep 3, 2008 at 3:06 AM, Anton Blanchard <anton@samba.org> wrote:
Why does the GCC alpha port emit a memory barrier at the beginning of the
test_and_set sync builtin sequence, which seems to be more than
the required `acquire' semantics?


Um, that's a good question.  It doesn't have one at the end either,
which would seem to be broken...  I should move it down to the end.

r~

References:
- [PATCH] Speed up __sync_lock_test_and_set on PowerPC
  - From: Anton Blanchard
- Re: [PATCH] Speed up __sync_lock_test_and_set on PowerPC
  - From: David Edelsohn

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