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From: "hjl.tools at gmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug libc/24872] __memmove_avx_unaligned_erms() performs significantly much slower than __memcpy_ssse3()
Date: Thu, 25 Mar 2021 00:05:31 +0000 [thread overview]
Message-ID: <bug-24872-131-PyubAqWGt6@http.sourceware.org/bugzilla/> (raw)
In-Reply-To: <bug-24872-131@http.sourceware.org/bugzilla/>
https://sourceware.org/bugzilla/show_bug.cgi?id=24872
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
On Intel i7-8559U, for glibc master branch, benchtests/bench-memcpy-large
shows:
Function: memcpy
Variant: large
__memcpy_avx_unaligned_erms __memcpy_ssse3
==============================================================================
length=65543, align1=0, align2=0: 14301.30 17782.90
length=65551, align1=0, align2=3: 15940.10 17913.20
length=65567, align1=3, align2=0: 13492.10 17706.70
length=65599, align1=3, align2=5: 16658.40 17927.30
length=131079, align1=0, align2=0: 30461.70 44844.90
length=131087, align1=0, align2=3: 10647.30 12163.80
length=131103, align1=3, align2=0: 9425.44 12177.90
length=131135, align1=3, align2=5: 11126.40 12181.70
length=262151, align1=0, align2=0: 23470.20 39790.60
length=262159, align1=0, align2=3: 33363.40 33786.50
length=262175, align1=3, align2=0: 23122.00 29927.70
length=262207, align1=3, align2=5: 25862.10 28582.20
length=524295, align1=0, align2=0: 45083.10 55485.80
length=524303, align1=0, align2=3: 47938.20 54088.40
length=524319, align1=3, align2=0: 42350.10 51983.70
length=524351, align1=3, align2=5: 45029.20 52464.20
length=1048583, align1=0, align2=0: 88527.90 101156.00
length=1048591, align1=0, align2=3: 93855.80 100754.00
length=1048607, align1=3, align2=0: 94034.90 100673.00
length=1048639, align1=3, align2=5: 90740.50 103256.00
length=2097159, align1=0, align2=0: 185803.00 193467.00
length=2097167, align1=0, align2=3: 187839.00 211012.00
length=2097183, align1=3, align2=0: 186758.00 195055.00
length=2097215, align1=3, align2=5: 190751.00 195920.00
length=4194311, align1=0, align2=0: 374530.00 391675.00
length=4194319, align1=0, align2=3: 378556.00 395988.00
length=4194335, align1=3, align2=0: 376987.00 396840.00
length=4194367, align1=3, align2=5: 380713.00 399326.00
length=8388615, align1=0, align2=0: 1248790.00 1296470.00
length=8388623, align1=0, align2=3: 924123.00 1011000.00
length=8388639, align1=3, align2=0: 910170.00 926244.00
length=8388671, align1=3, align2=5: 915979.00 1011690.00
length=16777223, align1=0, align2=0: 2119530.00 2228360.00
length=16777231, align1=0, align2=3: 2123510.00 2321720.00
length=16777247, align1=3, align2=0: 2092680.00 2231230.00
length=16777279, align1=3, align2=5: 2121050.00 2280890.00
length=33554439, align1=0, align2=0: 4881620.00 4770780.00
length=33554447, align1=0, align2=3: 4634040.00 4795500.00
length=33554463, align1=3, align2=0: 4599820.00 4676770.00
length=33554495, align1=3, align2=5: 4638870.00 4841840.00
avx_unaligned_erms is faster than ssse3
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next prev parent reply other threads:[~2021-03-25 0:05 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <bug-24872-131@http.sourceware.org/bugzilla/>
2020-05-30 15:30 ` jan at jki dot io
2021-03-24 23:46 ` hjl.tools at gmail dot com
2021-03-25 0:05 ` hjl.tools at gmail dot com [this message]
2021-03-25 2:42 ` skpgkp2 at gmail dot com
2021-03-25 3:00 ` skpgkp2 at gmail dot com
2021-03-25 5:53 ` skpgkp2 at gmail dot com
2021-03-25 13:04 ` hjl.tools at gmail dot com
2021-03-25 13:05 ` hjl.tools at gmail dot com
2021-03-25 13:16 ` skpgkp2 at gmail dot com
2021-03-25 16:28 ` skpgkp2 at gmail dot com
2021-03-25 16:59 ` skpgkp2 at gmail dot com
2021-05-29 5:54 ` gouhaojake at 163 dot com
2021-05-30 1:24 ` gouhaojake at 163 dot com
2021-05-30 1:40 ` hjl.tools at gmail dot com
2021-05-30 1:41 ` hjl.tools at gmail dot com
2021-05-30 5:07 ` gouhaojake at 163 dot com
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