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Re: [PATCH v4 0/2] Add AVX512F optimization option and buffer_zero_avx51


From: Paolo Bonzini
Subject: Re: [PATCH v4 0/2] Add AVX512F optimization option and buffer_zero_avx512()
Date: Fri, 6 Mar 2020 09:36:54 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1

On 29/02/20 13:34, Robert Hoo wrote:
> 1) Introduce {enable,disable}-avx512f configure option
> 
> 2) Implement new buffer_zero_avx512() with AVX512F instructions
> 
> Changes in v4:
> In init_cpuid_cache(), stringently test AVX512F OS level enablement.
> 
> Changes in v3:
> In init_accel(), init length_to_accel value in every accel case, because
> in unit test, it will be invoked several times with different accel cases.
> (Thanks Richard's careful review)
> 
> Changes in v2:
> 1. Fixes wrong definition of CACHE_SSE2 in v1.
> 2. Fixes not handle <256 length case in buffer_zero_avx512() implementaion.
> (Follow Richard's suggestion: handle the case in select_accel_fn(), and have a
> global variable alongside buffer_accel)
> 3. Changes avx512f configuration option's default status to disabled.
> 4. Ran 'make check-unit' on this patch, on both a Ivybridge machine and a
> CascadeLake machine.
> 
> 
> Robert Hoo (2):
>   configure: add configure option avx512f_opt
>   util: add util function buffer_zero_avx512()
> 
>  configure            | 41 +++++++++++++++++++++++++++++
>  include/qemu/cpuid.h |  3 +++
>  util/bufferiszero.c  | 74 
> +++++++++++++++++++++++++++++++++++++++++++++-------
>  3 files changed, 108 insertions(+), 10 deletions(-)
> 

Queued, thanks.

Paolo




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