85 lines
3.2 KiB
Diff
85 lines
3.2 KiB
Diff
From 1b992204f68af851e905c16016756fd4421e1934 Mon Sep 17 00:00:00 2001
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From: Noah Goldstein <goldstein.w.n@gmail.com>
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Date: Sun, 23 May 2021 19:43:24 -0400
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Subject: [PATCH] x86: Improve memmove-vec-unaligned-erms.S
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Content-type: text/plain; charset=UTF-8
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This patch changes the condition for copy 4x VEC so that if length is
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exactly equal to 4 * VEC_SIZE it will use the 4x VEC case instead of
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8x VEC case.
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Results For Skylake memcpy-avx2-erms
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size, al1 , al2 , Cur T , New T , Win , New / Cur
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128 , 0 , 0 , 9.137 , 6.873 , New , 75.22
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128 , 7 , 0 , 12.933 , 7.732 , New , 59.79
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128 , 0 , 7 , 11.852 , 6.76 , New , 57.04
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128 , 7 , 7 , 12.587 , 6.808 , New , 54.09
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Results For Icelake memcpy-evex-erms
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size, al1 , al2 , Cur T , New T , Win , New / Cur
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128 , 0 , 0 , 9.963 , 5.416 , New , 54.36
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128 , 7 , 0 , 16.467 , 8.061 , New , 48.95
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128 , 0 , 7 , 14.388 , 7.644 , New , 53.13
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128 , 7 , 7 , 14.546 , 7.642 , New , 52.54
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Results For Tigerlake memcpy-evex-erms
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size, al1 , al2 , Cur T , New T , Win , New / Cur
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128 , 0 , 0 , 8.979 , 4.95 , New , 55.13
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128 , 7 , 0 , 14.245 , 7.122 , New , 50.0
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128 , 0 , 7 , 12.668 , 6.675 , New , 52.69
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128 , 7 , 7 , 13.042 , 6.802 , New , 52.15
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Results For Skylake memmove-avx2-erms
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size, al1 , al2 , Cur T , New T , Win , New / Cur
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128 , 0 , 32 , 6.181 , 5.691 , New , 92.07
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128 , 32 , 0 , 6.165 , 5.752 , New , 93.3
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128 , 0 , 7 , 13.923 , 9.37 , New , 67.3
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128 , 7 , 0 , 12.049 , 10.182 , New , 84.5
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Results For Icelake memmove-evex-erms
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size, al1 , al2 , Cur T , New T , Win , New / Cur
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128 , 0 , 32 , 5.479 , 4.889 , New , 89.23
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128 , 32 , 0 , 5.127 , 4.911 , New , 95.79
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128 , 0 , 7 , 18.885 , 13.547 , New , 71.73
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128 , 7 , 0 , 15.565 , 14.436 , New , 92.75
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Results For Tigerlake memmove-evex-erms
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size, al1 , al2 , Cur T , New T , Win , New / Cur
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128 , 0 , 32 , 5.275 , 4.815 , New , 91.28
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128 , 32 , 0 , 5.376 , 4.565 , New , 84.91
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128 , 0 , 7 , 19.426 , 14.273 , New , 73.47
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128 , 7 , 0 , 15.924 , 14.951 , New , 93.89
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Signed-off-by: Noah Goldstein <goldstein.w.n@gmail.com>
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---
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sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S | 6 +++---
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1 file changed, 3 insertions(+), 3 deletions(-)
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diff --git a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
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index 3e2dd6bc..572cef04 100644
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--- a/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
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+++ b/sysdeps/x86_64/multiarch/memmove-vec-unaligned-erms.S
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@@ -417,8 +417,8 @@ L(more_2x_vec):
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cmpq $(VEC_SIZE * 8), %rdx
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ja L(more_8x_vec)
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cmpq $(VEC_SIZE * 4), %rdx
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- jb L(last_4x_vec)
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- /* Copy from 4 * VEC to 8 * VEC, inclusively. */
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+ jbe L(last_4x_vec)
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+ /* Copy from 4 * VEC + 1 to 8 * VEC, inclusively. */
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VMOVU (%rsi), %VEC(0)
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VMOVU VEC_SIZE(%rsi), %VEC(1)
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VMOVU (VEC_SIZE * 2)(%rsi), %VEC(2)
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@@ -437,7 +437,7 @@ L(more_2x_vec):
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VMOVU %VEC(7), -(VEC_SIZE * 4)(%rdi,%rdx)
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VZEROUPPER_RETURN
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L(last_4x_vec):
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- /* Copy from 2 * VEC to 4 * VEC. */
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+ /* Copy from 2 * VEC + 1 to 4 * VEC, inclusively. */
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VMOVU (%rsi), %VEC(0)
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VMOVU VEC_SIZE(%rsi), %VEC(1)
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VMOVU -VEC_SIZE(%rsi,%rdx), %VEC(2)
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--
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GitLab
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