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* [Bug string/27130] New: "rep movsb" performance issue
@ 2020-12-30 18:06 hjl.tools at gmail dot com
2021-01-01 22:54 ` [Bug string/27130] " hjl.tools at gmail dot com
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: hjl.tools at gmail dot com @ 2020-12-30 18:06 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=27130
Bug ID: 27130
Summary: "rep movsb" performance issue
Product: glibc
Version: 2.33
Status: NEW
Severity: normal
Priority: P2
Component: string
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
Target: x86-64
When copying with "rep movsb", if the distance between source and destination
is [1..63], performance can be very slow on some processors as shown in a test
case at
https://gitlab.com/x86-benchmarks/microbenchmark/-/tree/memcpy/63b
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* [Bug string/27130] "rep movsb" performance issue
2020-12-30 18:06 [Bug string/27130] New: "rep movsb" performance issue hjl.tools at gmail dot com
@ 2021-01-01 22:54 ` hjl.tools at gmail dot com
2021-01-04 16:07 ` hjl.tools at gmail dot com
2021-01-12 15:45 ` hjl.tools at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: hjl.tools at gmail dot com @ 2021-01-01 22:54 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=27130
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Target Milestone|--- |2.33
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* [Bug string/27130] "rep movsb" performance issue
2020-12-30 18:06 [Bug string/27130] New: "rep movsb" performance issue hjl.tools at gmail dot com
2021-01-01 22:54 ` [Bug string/27130] " hjl.tools at gmail dot com
@ 2021-01-04 16:07 ` hjl.tools at gmail dot com
2021-01-12 15:45 ` hjl.tools at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: hjl.tools at gmail dot com @ 2021-01-04 16:07 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=27130
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed on master by
https://sourceware.org/git/?p=glibc.git;a=commit;h=3ec5d83d2a237d39e7fd6ef7a0bc8ac4c171a4a5
The fix will be backported to release branches later.
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* [Bug string/27130] "rep movsb" performance issue
2020-12-30 18:06 [Bug string/27130] New: "rep movsb" performance issue hjl.tools at gmail dot com
2021-01-01 22:54 ` [Bug string/27130] " hjl.tools at gmail dot com
2021-01-04 16:07 ` hjl.tools at gmail dot com
@ 2021-01-12 15:45 ` hjl.tools at gmail dot com
2 siblings, 0 replies; 4+ messages in thread
From: hjl.tools at gmail dot com @ 2021-01-12 15:45 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=27130
H.J. Lu <hjl.tools at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |FIXED
Status|NEW |RESOLVED
--- Comment #2 from H.J. Lu <hjl.tools at gmail dot com> ---
Fixed for 2.33 and on 2.28/2.29/2.30/2.31/2.32 branches.
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end of thread, other threads:[~2021-01-12 15:45 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2020-12-30 18:06 [Bug string/27130] New: "rep movsb" performance issue hjl.tools at gmail dot com
2021-01-01 22:54 ` [Bug string/27130] " hjl.tools at gmail dot com
2021-01-04 16:07 ` hjl.tools at gmail dot com
2021-01-12 15:45 ` hjl.tools at gmail dot com
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