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Re: [PATCH v4 2/2] util: add util function buffer_zero_avx512()
From: |
Richard Henderson |
Subject: |
Re: [PATCH v4 2/2] util: add util function buffer_zero_avx512() |
Date: |
Sat, 29 Feb 2020 09:29:18 -0800 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 |
On 2/29/20 4:34 AM, Robert Hoo wrote:
> And intialize buffer_is_zero() with it, when Intel AVX512F is
> available on host.
>
> This function utilizes Intel AVX512 fundamental instructions which
> is faster than its implementation with AVX2 (in my unit test, with
> 4K buffer, on CascadeLake SP, ~36% faster, buffer_zero_avx512() V.S.
> buffer_zero_avx2()).
>
> Signed-off-by: Robert Hoo <address@hidden>
> ---
> include/qemu/cpuid.h | 3 +++
> util/bufferiszero.c | 74
> +++++++++++++++++++++++++++++++++++++++++++++-------
> 2 files changed, 67 insertions(+), 10 deletions(-)
Reviewed-by: Richard Henderson <address@hidden>
r~