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	Commit message (Collapse)	Author	Age	Files	Lines
*	amd64: Stop using REP MOVSB for backward memmove()s.	Alexander Motin	2022-06-30	1	-8/+0
\| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \| \|	Enhanced REP MOVSB feature of CPUs starting from Ivy Bridge makes REP MOVSB the fastest way to copy memory in most of cases. However Intel Optimization Reference Manual says: "setting the DF to force REP MOVSB to copy bytes from high towards low addresses will expe- rience significant performance degradation". Measurements on Intel Cascade Lake and Alder Lake, same as on AMD Zen3 show that it can drop throughput to as low as 2.5-3.5GB/s, comparing to ~10-30GB/s of REP MOVSQ or hand-rolled loop, used for non-ERMS CPUs. This patch keeps ERMS use for forward ordered memory copies, but removes it for backward overlapped moves where it does not work. This is just a cosmetic sync with kernel, since libc does not use ERMS at this time. Reviewed by: mjg MFC after: 2 weeks (cherry picked from commit f22068d91bf53696ee13a69685e809d35776ec3f)
*	amd64: add missing ALIGN_TEXT to loops in memset and memmove	Mateusz Guzik	2021-06-26	1	-0/+2
\| \| \| \|	(cherry picked from commit 164c3b81848bc81dc200b12370999474225447a3)
*	MFC r341272,r341273,r341351	Mateusz Guzik	2018-12-19	1	-70/+78
\| \| \| \| \| \| \| \| \|	amd64: tidy up copying backwards in memmove amd64: remove stale attribution for memmove work amd64: handle small memmove buffers with overlapping stores Notes: svn path=/stable/12/; revision=342240
*	MFC r341364	Mateusz Guzik	2018-12-19	1	-0/+30
\| \| \| \| \| \| \|	amd64: align target memmove buffer to 16 bytes before using rep movs Notes: svn path=/stable/12/; revision=342238
*	amd64: import updated kernel memmove to libc	Mateusz Guzik	2018-10-13	1	-4/+269
\| \| \| \| \| \| \| \| \| \| \| \| \| \|	bcopy is left alone as it is expected to be converted to a C func. Due to header mess ALIGN_TEXT is temporarily defined explicitly in memmove.S Reviewed by: kib Approved by: re (gjb) Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D17538 Notes: svn path=/head/; revision=339347
*	Remove duplicate .note.GNU-stack section declaration. bcopy already	Konstantin Belousov	2011-02-04	1	-2/+0
\| \| \| \| \| \| \| \| \|	made the neccessary provisions. Reported by: arundel Notes: svn path=/head/; revision=218303
*	Add section .note.GNU-stack for assembly files used by 386 and amd64.	Konstantin Belousov	2011-01-07	1	-0/+2
\| \| \| \|	Notes: svn path=/head/; revision=217106
*	Add machine-specific, optimized implementations of bcopy, bzero, memcpy,	Alan Cox	2005-04-07	1	-0/+5
	memmove, and memset. PR: 73111 Submitted by: Ville-Pertti Keinonen <will@iki.fi> (taken from NetBSD) MFC after: 3 weeks Notes: svn path=/head/; revision=144730