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From: Uros Bizjak <ubizjak@gmail.com>
Date: Tue, 14 Nov 2017 08:31:00 -0000
Message-ID: <CAFULd4bvy76o-mrzXJU-Dj7m06huayx_8gZAHzfZFSTv_PX3Vg@mail.gmail.com>
Subject: Re: [PATCH, i386] Refactor -mprefer-avx[128|256] options into common -mprefer-vector-width=[none|128|256|512]
To: Joseph Myers <joseph@codesourcery.com>
Cc: "Shalnov, Sergey" <sergey.shalnov@intel.com>, 	"gcc-patches@gcc.gnu.org" <gcc-patches@gcc.gnu.org>, 	"kirill.yukhin@gmail.com" <kirill.yukhin@gmail.com>, "Koval, Julia" <julia.koval@intel.com>, 	"Senkevich, Andrew" <andrew.senkevich@intel.com>, "Peryt, Sebastian" <sebastian.peryt@intel.com>, 	"Ivchenko, Alexander" <alexander.ivchenko@intel.com>
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On Tue, Nov 14, 2017 at 12:14 AM, Joseph Myers <joseph@codesourcery.com> wrote:
> On Mon, 13 Nov 2017, Uros Bizjak wrote:
>
>> [BTW: --mprefer-avx128 should be marked RejectNegative from the
>> beginning; let's just assume nobody uses it in its (somehow weird)
>> negative "-mno-prefer-avx128" form.]
>
> It's used in that form in various testcases that otherwise fail when GCC
> is configured --with-arch= some CPU that defaults to -mprefer-avx128.

In this case, an even better choice would be:

Alias(mprefer-vector-width=, 128, none)

So, -mno-prefer-avx128 would just set the default back to none.

Uros.