From: "H.J. Lu" <hjl.tools@gmail.com>
To: Noah Goldstein <goldstein.w.n@gmail.com>
Cc: GNU C Library <libc-alpha@sourceware.org>,
"Carlos O'Donell" <carlos@systemhalted.org>
Subject: Re: [PATCH v1 2/2] x86: Improve memmove-vec-unaligned-erms.S
Date: Sun, 23 May 2021 18:45:04 -0700 [thread overview]
Message-ID: <CAMe9rOoGRef__2ZGxwFEbUm_=ArYLe9Y=Q-Gp4VwEEmwhzfF-g@mail.gmail.com> (raw)
In-Reply-To: <20210524013020.1869687-2-goldstein.w.n@gmail.com>
On Sun, May 23, 2021 at 6:30 PM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
>
> This patch changes the condition for copy 4x VEC so that if length is
> exactly equal to 4 * VEC_SIZE it will use the 4x VEC case instead of
> 8x VEC case.
>
> Results For Skylake memcpy-avx2-erms
> size, al1 , al2 , Cur T , New T , Win , New / Cur
> 128 , 0 , 0 , 9.137 , 6.873 , New , 75.22
> 128 , 7 , 0 , 12.933 , 7.732 , New , 59.79
> 128 , 0 , 7 , 11.852 , 6.76 , New , 57.04
> 128 , 7 , 7 , 12.587 , 6.808 , New , 54.09
>
> Results For Icelake memcpy-evex-erms
> size, al1 , al2 , Cur T , New T , Win , New / Cur
> 128 , 0 , 0 , 9.963 , 5.416 , New , 54.36
> 128 , 7 , 0 , 16.467 , 8.061 , New , 48.95
> 128 , 0 , 7 , 14.388 , 7.644 , New , 53.13
> 128 , 7 , 7 , 14.546 , 7.642 , New , 52.54
>
> Results For Tigerlake memcpy-evex-erms
> size, al1 , al2 , Cur T , New T , Win , New / Cur
> 128 , 0 , 0 , 8.979 , 4.95 , New , 55.13
> 128 , 7 , 0 , 14.245 , 7.122 , New , 50.0
> 128 , 0 , 7 , 12.668 , 6.675 , New , 52.69
> 128 , 7 , 7 , 13.042 , 6.802 , New , 52.15
>
> Results For Skylake memmove-avx2-erms
> size, al1 , al2 , Cur T , New T , Win , New / Cur
> 128 , 0 , 32 , 6.181 , 5.691 , New , 92.07
> 128 , 32 , 0 , 6.165 , 5.752 , New , 93.3
> 128 , 0 , 7 , 13.923 , 9.37 , New , 67.3
> 128 , 7 , 0 , 12.049 , 10.182 , New , 84.5
>
> Results For Icelake memmove-evex-erms
> size, al1 , al2 , Cur T , New T , Win , New / Cur
> 128 , 0 , 32 , 5.479 , 4.889 , New , 89.23
> 128 , 32 , 0 , 5.127 , 4.911 , New , 95.79
> 128 , 0 , 7 , 18.885 , 13.547 , New , 71.73
> 128 , 7 , 0 , 15.565 , 14.436 , New , 92.75
>
> Results For Tigerlake memmove-evex-erms
> size, al1 , al2 , Cur T , New T , Win , New / Cur
> 128 , 0 , 32 , 5.275 , 4.815 , New , 91.28
> 128 , 32 , 0 , 5.376 , 4.565 , New , 84.91
> 128 , 0 , 7 , 19.426 , 14.273 , New , 73.47
> 128 , 7 , 0 , 15.924 , 14.951 , New , 93.89
>
> Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
> ---
> sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
> index 5e4a071f16..d36cd288c7 100644
> --- a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
> +++ b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
> @@ -420,7 +420,7 @@ L(more_2x_vec):
> cmpq $(VEC_SIZE * 8), %rdx
> ja L(more_8x_vec)
> cmpq $(VEC_SIZE * 4), %rdx
> - jb L(last_4x_vec)
> + jbe L(last_4x_vec)
> /* Copy from 4 * VEC to 8 * VEC, inclusively. */
^^^^^^^^^^^^^^^^^^^^ Please also update the comment to
"4 * VEC + 1"
> VMOVU (%rsi), %VEC(0)
> VMOVU VEC_SIZE(%rsi), %VEC(1)
> --
> 2.25.1
>
Thanks.
--
H.J.
next prev parent reply other threads:[~2021-05-24 1:45 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-24 1:30 [PATCH v1 1/2] Bench: Add support for choose direction of memcpy in benchtests Noah Goldstein
2021-05-24 1:30 ` [PATCH v1 2/2] x86: Improve memmove-vec-unaligned-erms.S Noah Goldstein
2021-05-24 1:45 ` H.J. Lu [this message]
2021-05-24 3:15 ` Noah Goldstein
2021-05-24 3:15 ` [PATCH v2 1/2] Bench: Add support for choose direction of memcpy in benchtests Noah Goldstein
2021-05-24 3:15 ` [PATCH v2 2/2] x86: Improve memmove-vec-unaligned-erms.S Noah Goldstein
2021-05-24 3:21 ` H.J. Lu
2022-04-28 0:07 ` Sunil Pandey
2021-05-24 3:22 ` [PATCH v2 1/2] Bench: Add support for choose direction of memcpy in benchtests H.J. Lu
2021-05-24 1:48 ` [PATCH v1 " H.J. Lu
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