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>,
"Илья Энкович" <enkovich.gnu@gmail.com>
Subject: Re: [PATCH] Missing Skylake -march=/-mtune= option
Date: Thu, 20 Aug 2015 15:52:00 -0000 [thread overview]
Message-ID: <20150820154923.GA399@x4> (raw)
In-Reply-To: <CAEoMCqSAJ1P8XwVAe0w4=+HsnPyShD-kSpbsxHxgBMjFS7UtDw@mail.gmail.com>
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
next prev parent reply other threads:[~2015-08-20 15:49 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-13 9:36 Yuri Rumyantsev
2015-08-13 20:05 ` Uros Bizjak
2015-08-19 10:47 ` Richard Biener
2015-08-19 11:11 ` Uros Bizjak
2015-08-19 11:39 ` Richard Biener
2015-08-20 15:52 ` Markus Trippelsdorf [this message]
2015-08-23 14:46 ` Markus Trippelsdorf
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