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Re: Use AVX/AVX512 selectively
- From: Florian Weimer <fw at deneb dot enyo dot de>
- To: Victor Rodriguez <vm dot rod25 at gmail dot com>
- Cc: gcc-help <gcc-help at gcc dot gnu dot org>
- Date: Thu, 03 Mar 2016 15:49:53 +0100
- Subject: Re: Use AVX/AVX512 selectively
- Authentication-results: sourceware.org; auth=none
- References: <8760x6meb1 dot fsf at mid dot deneb dot enyo dot de> <CAK5mtexM6uRcw6WsRk+g=04xgKVLkx11PG5ffAWzs=y-=mNCBw at mail dot gmail dot com> <87twknd44v dot fsf at mid dot deneb dot enyo dot de> <CAK5mtezbaXD2759HuS-xx4u_bj_1rWH52bxzoX7p_yCGfc4Qng at mail dot gmail dot com>
* Victor Rodriguez:
> On Thu, Mar 3, 2016 at 8:31 AM, Florian Weimer <fw@deneb.enyo.de> wrote:
>> * Victor Rodriguez:
>>
>>> What HW are you ussing ?
>>
>> Both hardware with amd without avx512f capability. There is run-time
>> detection for it, but for it to be effective, most of the program has
>> to be compiled without -mavx512f, otherwise the program will use
>> avx512f instructions before getting to the detection code.
>
> Have you try Function Multi Versioning ?
According to the GCC documentation, "avx2" and so on are not supported
as targets in target function attributes. Perhaps this is incorrect
and the manual needs fixing?