From owner-svn-src-head@freebsd.org Tue Jul 3 22:03:29 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 B0D53102C950; Tue, 3 Jul 2018 22:03:29 +0000 (UTC) (envelope-from jhb@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 64202732B0; Tue, 3 Jul 2018 22:03:29 +0000 (UTC) (envelope-from jhb@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 4557B2200E; Tue, 3 Jul 2018 22:03:29 +0000 (UTC) (envelope-from jhb@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.37]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id w63M3TWc033075; Tue, 3 Jul 2018 22:03:29 GMT (envelope-from jhb@FreeBSD.org) Received: (from jhb@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id w63M3T47033074; Tue, 3 Jul 2018 22:03:29 GMT (envelope-from jhb@FreeBSD.org) Message-Id: <201807032203.w63M3T47033074@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: jhb set sender to jhb@FreeBSD.org using -f From: John Baldwin Date: Tue, 3 Jul 2018 22:03:29 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r335913 - head/sys/amd64/include X-SVN-Group: head X-SVN-Commit-Author: jhb X-SVN-Commit-Paths: head/sys/amd64/include X-SVN-Commit-Revision: 335913 X-SVN-Commit-Repository: base MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.27 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: Tue, 03 Jul 2018 22:03:29 -0000 Author: jhb Date: Tue Jul 3 22:03:28 2018 New Revision: 335913 URL: https://svnweb.freebsd.org/changeset/base/335913 Log: Use 'e' instead of 'i' constraints with 64-bit atomic operations on amd64. The ADD, AND, OR, and SUB instructions take at most a 32-bit sign-extended immediate operand. 64-bit constants that do not fit into that constraint need to be loaded into a register. The 'i' constraint tells the compiler it can pass any integer constant to the assembler, whereas the 'e' constrain only permits constants that fit into a 32-bit sign-extended value. This fixes using atomic_add/clear/set/subtract_long/64 with constants that do not fit into a 32-bit sign-extended immediate. Reported by: several folks Tested by: Pete Wright MFC after: 2 weeks Modified: head/sys/amd64/include/atomic.h Modified: head/sys/amd64/include/atomic.h ============================================================================== --- head/sys/amd64/include/atomic.h Tue Jul 3 21:29:04 2018 (r335912) +++ head/sys/amd64/include/atomic.h Tue Jul 3 22:03:28 2018 (r335913) @@ -446,10 +446,10 @@ ATOMIC_ASM(clear, int, "andl %1,%0", "ir", ~v); ATOMIC_ASM(add, int, "addl %1,%0", "ir", v); ATOMIC_ASM(subtract, int, "subl %1,%0", "ir", v); -ATOMIC_ASM(set, long, "orq %1,%0", "ir", v); -ATOMIC_ASM(clear, long, "andq %1,%0", "ir", ~v); -ATOMIC_ASM(add, long, "addq %1,%0", "ir", v); -ATOMIC_ASM(subtract, long, "subq %1,%0", "ir", v); +ATOMIC_ASM(set, long, "orq %1,%0", "er", v); +ATOMIC_ASM(clear, long, "andq %1,%0", "er", ~v); +ATOMIC_ASM(add, long, "addq %1,%0", "er", v); +ATOMIC_ASM(subtract, long, "subq %1,%0", "er", v); #define ATOMIC_LOADSTORE(TYPE) \ ATOMIC_LOAD(TYPE); \