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Date: Thu, 20 Aug 2015 15:52:00 -0000
From: Markus Trippelsdorf <markus@trippelsdorf.de>
To: Yuri Rumyantsev <ysrumyan@gmail.com>
Cc: gcc-patches <gcc-patches@gcc.gnu.org>, Uros Bizjak <ubizjak@gmail.com>,	Igor Zamyatin <izamyatin@gmail.com>,	=?utf-8?B?0JjQu9GM0Y8g0K3QvdC60L7QstC40Yc=?= <enkovich.gnu@gmail.com>
Subject: Re: [PATCH] Missing Skylake -march=/-mtune= option
Message-ID: <20150820154923.GA399@x4>
References: <CAEoMCqSAJ1P8XwVAe0w4=+HsnPyShD-kSpbsxHxgBMjFS7UtDw@mail.gmail.com>
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X-SW-Source: 2015-08/txt/msg01218.txt.bz2

On 2015.08.13 at 12:31 +0300, Yuri Rumyantsev wrote:
> Hi All,
> 
> Here is patch for adding march/mtune options for Skylake.

http://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/desktop-6th-gen-core-family-spec-update.pdf 

states that BMI1 and BMI2 are not supported. Is this true for all
Skylake CPUs?

Quote from the pdf:

SKD002 CPUID Incorrectly Reports Bit Manipulation Instructions Support

Executing CPUID with EAX = 7 and ECX = 0 may return EBX with bits [3]
and [8] set, incorrectly indicating the presence of BMI1 and BMI2
instruction set extensions.
Attempting to use instructions from the BMI1 or BMI2 instruction set
extensions will result in a #UD exception.

-- 
Markus