This is the mail archive of the gcc-patches@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, i386]: Implement atomic_fetch_sub

From: Uros Bizjak <ubizjak at gmail dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: Richard Henderson <rth at redhat dot com>
Date: Fri, 3 Aug 2012 09:24:00 +0200
Subject: Re: [PATCH, i386]: Implement atomic_fetch_sub
References: <CAFULd4ZG8hH20HR0Dix5i7C0hVz7Bm4jvmMPH9UjZYn_5gzSxw@mail.gmail.com>

On Fri, Aug 3, 2012 at 8:40 AM, Uros Bizjak <ubizjak@gmail.com> wrote:

> We can implement atomic_fetch_sub with atomic_fetch_add and inverted
> operand 2. However, we have to prevent overflows with negation, so
> only const_int operand 2 is allowed in the expander.
>
> 2012-08-02  Uros Bizjak  <ubizjak@gmail.com>
>
>         PR target/54087
>         * config/i386/sync.md (atomic_fetch_sub<mode>): New expander.
>
> Tested on x86_64-pc-linux-gnu {,-m32}.
>
> I will wait for a day for possible comments.

Patch attached again, this time with a testcase.

2012-08-02  Uros Bizjak  <ubizjak@gmail.com>

	PR target/54087
	* gcc.target/i386/pr54087.c: New test.

Uros.

Attachment: p.diff.txt
Description: Text document

Follow-Ups:
- Re: [PATCH, i386]: Implement atomic_fetch_sub
  - From: Richard Guenther

References:
- [PATCH, i386]: Implement atomic_fetch_sub
  - From: Uros Bizjak

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