Mateusz Guzik 088ac3ef4b amd64: handle small memset buffers with overlapping stores ... Instead of jumping to locations which store the exact number of bytes, use displacement to move the destination. In particular the following clears an area between 8-16 (inclusive) branch-free: movq %r10,(%rdi) movq %r10,-8(%rdi,%rcx) For instance for rcx of 10 the second line is rdi + 10 - 8 = rdi + 2. Writing 8 bytes starting at that offset overlaps with 6 bytes written previously and writes 2 new, giving 10 in total. Provides a nice win for smaller stores. Other ones are erratic depending on the microarchitecture. General idea taken from NetBSD (restricted use of the trick) and bionic string functions (use for various ranges like in this patch). Reviewed by: kib (previous version) Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D17660		2018-11-16 00:44:22 +00:00
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bcmp.S	amd64: reimplement libc memcmp and bcmp with kernel memcmp	2018-09-27 17:08:29 +00:00
bcopy.c	amd64: convert libc bcopy to a C func to avoid future bloat	2018-10-13 21:17:28 +00:00
bzero.c	amd64: convert libc bzero to a C func to avoid future bloat	2018-11-15 20:20:39 +00:00
Makefile.inc	amd64: convert libc bzero to a C func to avoid future bloat	2018-11-15 20:20:39 +00:00
memcmp.S	amd64: reimplement libc memcmp and bcmp with kernel memcmp	2018-09-27 17:08:29 +00:00
memcpy.S	amd64: import updated kernel memmove to libc	2018-10-13 21:15:47 +00:00
memmove.S	amd64: import updated kernel memmove to libc	2018-10-13 21:15:47 +00:00
memset.S	amd64: handle small memset buffers with overlapping stores	2018-11-16 00:44:22 +00:00
stpcpy.S	Remove incorrect attribution.	2011-07-21 20:06:14 +00:00
strcat.S	Add section .note.GNU-stack for assembly files used by 386 and amd64.	2011-01-07 16:08:40 +00:00
strcmp.S	libc: spelling fixes.	2016-04-30 01:24:24 +00:00
strcpy.c	libc: further adoption of SPDX licensing ID tags.	2017-11-25 17:12:48 +00:00