From owner-svn-src-head@freebsd.org Thu Nov 8 15:12:38 2018 Return-Path: Delivered-To: svn-src-head@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 0A83A112D2F7; Thu, 8 Nov 2018 15:12:38 +0000 (UTC) (envelope-from mjg@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.nyi.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 8A78182DC2; Thu, 8 Nov 2018 15:12:37 +0000 (UTC) (envelope-from mjg@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 64DA0263AC; Thu, 8 Nov 2018 15:12:37 +0000 (UTC) (envelope-from mjg@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id wA8FCbCM086294; Thu, 8 Nov 2018 15:12:37 GMT (envelope-from mjg@FreeBSD.org) Received: (from mjg@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id wA8FCbqG086293; Thu, 8 Nov 2018 15:12:37 GMT (envelope-from mjg@FreeBSD.org) Message-Id: <201811081512.wA8FCbqG086293@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: mjg set sender to mjg@FreeBSD.org using -f From: Mateusz Guzik Date: Thu, 8 Nov 2018 15:12:37 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r340252 - head/sys/amd64/amd64 X-SVN-Group: head X-SVN-Commit-Author: mjg X-SVN-Commit-Paths: head/sys/amd64/amd64 X-SVN-Commit-Revision: 340252 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 8A78182DC2 X-Spamd-Result: default: False [-103.11 / 200.00]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000,0]; ALLOW_DOMAIN_WHITELIST(-100.00)[FreeBSD.org]; FROM_HAS_DN(0.00)[]; RCPT_COUNT_THREE(0.00)[3]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000,0]; MIME_GOOD(-0.10)[text/plain]; TO_DN_NONE(0.00)[]; HAS_XAW(0.00)[]; R_SPF_SOFTFAIL(0.00)[~all]; DMARC_NA(0.00)[FreeBSD.org]; RCVD_COUNT_THREE(0.00)[4]; MX_GOOD(-0.01)[cached: mx1.FreeBSD.org]; NEURAL_HAM_SHORT(-1.00)[-1.000,0]; FROM_EQ_ENVFROM(0.00)[]; R_DKIM_NA(0.00)[]; RCVD_TLS_LAST(0.00)[] X-Rspamd-Server: mx1.freebsd.org X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 08 Nov 2018 15:12:38 -0000 Author: mjg Date: Thu Nov 8 15:12:36 2018 New Revision: 340252 URL: https://svnweb.freebsd.org/changeset/base/340252 Log: amd64: align memset buffers to 16 bytes before using rep stos Both Intel manual and Agner Fog's docs suggest aligning to 16. See the review for benchmark results. Reviewed by: kib (previous version) Sponsored by: The FreeBSD Foundation Differential Revision: https://reviews.freebsd.org/D17661 Modified: head/sys/amd64/amd64/support.S Modified: head/sys/amd64/amd64/support.S ============================================================================== --- head/sys/amd64/amd64/support.S Thu Nov 8 14:46:21 2018 (r340251) +++ head/sys/amd64/amd64/support.S Thu Nov 8 15:12:36 2018 (r340252) @@ -515,24 +515,38 @@ END(memcpy_erms) 1256: movq %rdi,%r9 movq %r10,%rax + testl $15,%edi + jnz 3f +1: .if \erms == 1 rep stosb movq %r9,%rax .else + movq %rcx,%rdx shrq $3,%rcx rep stosq movq %r9,%rax andl $7,%edx - jnz 1f + jnz 2f POP_FRAME_POINTER ret -1: +2: movq %r10,-8(%rdi,%rdx) .endif POP_FRAME_POINTER ret + ALIGN_TEXT +3: + movq %r10,(%rdi) + movq %r10,8(%rdi) + movq %rdi,%r8 + andq $15,%r8 + leaq -16(%rcx,%r8),%rcx + neg %r8 + leaq 16(%rdi,%r8),%rdi + jmp 1b .endm ENTRY(memset_std)