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Re: [PATCH x86_64][BZ #20139] Don't allow configure with not supporting AVX512 assembler w/o --disable-avx512.
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: Florian Weimer <fweimer at redhat dot com>
- Cc: Andrew Senkevich <andrew dot n dot senkevich at gmail dot com>, Joseph Myers <joseph at codesourcery dot com>, libc-alpha <libc-alpha at sourceware dot org>
- Date: Mon, 27 Jun 2016 12:07:47 -0700
- Subject: Re: [PATCH x86_64][BZ #20139] Don't allow configure with not supporting AVX512 assembler w/o --disable-avx512.
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- References: <CAMXFM3tJkhW78PPe4=FUhbm=8HoOY4iouSqXxLObA0GEMTxoZA at mail dot gmail dot com> <alpine dot DEB dot 2 dot 20 dot 1606271751470 dot 7438 at digraph dot polyomino dot org dot uk> <CAMXFM3t_92RMmU=u-70nCHqwXL0BsZ6=82Jn=neiDx82HxjjRg at mail dot gmail dot com> <96d24e9d-bf84-a43b-2860-c49d4fe341a4 at redhat dot com>
On Mon, Jun 27, 2016 at 12:04 PM, Florian Weimer <fweimer@redhat.com> wrote:
> On 06/27/2016 08:36 PM, Andrew Senkevich wrote:
>>
>> 2016-06-27 20:53 GMT+03:00 Joseph Myers <joseph@codesourcery.com>:
>>>
>>> On Mon, 27 Jun 2016, Andrew Senkevich wrote:
>>>
>>>> Hi,
>>>>
>>>> this patch adds new configure option --enable-avx512 and defaults it for
>>>> x86_64.
>>>>
>>>> To fix BZ #20139 we need don't let to configure with not supporting
>>>> AVX512 assembler w/o --disable-avx512.
>>>
>>>
>>> What assembler version is required to support AVX512, and when was that
>>> version released? It might be better to increase the minimum binutils
>>> version for building glibc (generally, or for x86_64).
>>
>>
>> May be it will be the best way. Needed version is 2.25 and it was
>> released at Mon, 5 Jan 2015.
>
>
> It's a fairly recent version.
>
Binutils 2.24 released in Dec., 2013 supports AVX512.
--
H.J.