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Re: intrinsic function for the assembly x86 xchg command

From: Martin Liška <mliska at suse dot cz>
To: Yichao Yu <yyc1992 at gmail dot com>, fab10 <0xfab10 at gmail dot com>
Cc: gcc at gcc dot gnu dot org
Date: Wed, 19 Apr 2017 10:51:05 +0200
Subject: Re: intrinsic function for the assembly x86 xchg command
Authentication-results: sourceware.org; auth=none
References: <0ad4a4bb-9c9c-d5be-bd2a-d5c62040d9b2@gmail.com> <CAMvDr+T9-Sqj4MihoFX9TVKqD5q3vKVFKspExCbhhX0-jsfXRw@mail.gmail.com>

On 04/07/2017 08:10 PM, Yichao Yu wrote:

On Fri, Apr 7, 2017 at 2:08 PM, fab10 <0xfab10@gmail.com> wrote:

It would be usefull to develop in gcc an intrinsic function for the assembly
x86 instruction xchg to implement a low level mutex.


I believe that's what atomic_exchange is lowered to on x86?


Yes.

You can take a look here:
https://gcc.gnu.org/onlinedocs/gcc/_005f_005fatomic-Builtins.html

Martin

References:
- intrinsic function for the assembly x86 xchg command
  - From: fab10
- Re: intrinsic function for the assembly x86 xchg command
  - From: Yichao Yu

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