src/lib/libc/amd64/string/bzero.S, branch releng/12.4

MFC r339531,r339579,r340252,r340463,r340464,340472,r340587

2018-11-20T17:10:44Z

amd64: tidy up memset to have rax set earlier for small sizes amd64: finish the tail in memset with an overlapping store amd64: align memset buffers to 16 bytes before using rep stos amd64: convert libc bzero to a C func to avoid future bloat amd64: sync up libc memset with the kernel version amd64: handle small memset buffers with overlapping stores Fix -DNO_CLEAN amd64 build after r340463

amd64: reimplement libc memset and bzero with kernel memset

2018-10-01T20:39:17Z

This is a depessimization, see r334537 for an explanation. Routines remain significantly slower than they have to be. bzero was removed from the kernel but remains in libc. Macroify to accommodate differences to memset (no return value, always setting to 0). The bzero.S file is left in place due to libc build magic which pulls in a C variant if a matching .S file is missing. Reviewed by: kib Approved by: re (gjb) Differential Revision: https://reviews.freebsd.org/D17355

Add section .note.GNU-stack for assembly files used by 386 and amd64.

2011-01-07T16:08:40Z

We've been lax about matching END() macros in asm code for some time. This

2008-11-02T01:10:54Z

is used to set the ELF size attribute for functions. It isn't normally critical but some things can make use of it (gdb for stack traces). Valgrind needs it so I'm adding it in. The problem is present on all branches and on both i386 and amd64.

Eliminate an unneeded instruction that is a vestige of mechanical

2005-04-07T05:46:46Z

translation from i386.

Add machine-specific, optimized implementations of bcopy, bzero, memcpy,

2005-04-07T03:56:03Z

memmove, and memset. PR: 73111 Submitted by: Ville-Pertti Keinonen (taken from NetBSD) MFC after: 3 weeks