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Re: Does GCC need a special switch for ADCX/ADOX?

From: Jeffrey Walton <noloader at gmail dot com>
To: Xi Ruoyao <ryxi at stu dot xidian dot edu dot cn>
Cc: "gcc-help at gcc dot gnu dot org" <gcc-help at gcc dot gnu dot org>
Date: Mon, 21 Aug 2017 06:29:49 -0400
Subject: Re: Does GCC need a special switch for ADCX/ADOX?
Authentication-results: sourceware.org; auth=none
References: <CAH8yC8kkG2x_oSSPW1QrZ30Ryc314WGT9tCzcQg0i57N3vFS6Q@mail.gmail.com> <1503310472.9607.6.camel@stu.xidian.edu.cn>
Reply-to: noloader at gmail dot com

On Mon, Aug 21, 2017 at 6:14 AM, Xi Ruoyao <ryxi@stu.xidian.edu.cn> wrote:
> On 2017-08-21 04:25 -0400, Jeffrey Walton wrote:
>
>> Does GCC need a special switch for ADCX/ADOX?
>
> On my Core i3 (ivybridge) -march=native is enough to generate ADCQ with
> _addcarryx_u64.  And according to GCC testsuite, _addcarryx_u64 always
> translates to ADCQ on x86-64 since all x86-64 CPU have it:
>
> <http://gcc.gnu.org/viewcvs/gcc/trunk/gcc/testsuite/gcc.target/i386/
> adx-addcarryx64-3.c?revision=214860&view=markup>

Ack, thanks. Let me spin up another thread with the details and the
[failed] result.

Jeff

Follow-Ups:
- Re: Does GCC need a special switch for ADCX/ADOX?
  - From: Xi Ruoyao

References:
- Does GCC need a special switch for ADCX/ADOX?
  - From: Jeffrey Walton
- Re: Does GCC need a special switch for ADCX/ADOX?
  - From: Xi Ruoyao

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