From owner-svn-src-stable-9@freebsd.org Wed Aug 12 19:06:36 2015 Return-Path: Delivered-To: svn-src-stable-9@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id DB90E9A02EE; Wed, 12 Aug 2015 19:06:36 +0000 (UTC) (envelope-from dim@FreeBSD.org) Received: from repo.freebsd.org (repo.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id CBB58E49; Wed, 12 Aug 2015 19:06:36 +0000 (UTC) (envelope-from dim@FreeBSD.org) Received: from repo.freebsd.org ([127.0.1.70]) by repo.freebsd.org (8.15.2/8.15.2) with ESMTP id t7CJ6amK083950; Wed, 12 Aug 2015 19:06:36 GMT (envelope-from dim@FreeBSD.org) Received: (from dim@localhost) by repo.freebsd.org (8.15.2/8.15.2/Submit) id t7CJ6aqY083949; Wed, 12 Aug 2015 19:06:36 GMT (envelope-from dim@FreeBSD.org) Message-Id: <201508121906.t7CJ6aqY083949@repo.freebsd.org> X-Authentication-Warning: repo.freebsd.org: dim set sender to dim@FreeBSD.org using -f From: Dimitry Andric Date: Wed, 12 Aug 2015 19:06:36 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org Subject: svn commit: r286688 - in stable: 10/lib/msun/src 8/lib/msun/src 9/lib/msun/src X-SVN-Group: stable-9 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-9@freebsd.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: SVN commit messages for only the 9-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 12 Aug 2015 19:06:37 -0000 Author: dim Date: Wed Aug 12 19:06:35 2015 New Revision: 286688 URL: https://svnweb.freebsd.org/changeset/base/286688 Log: MFC r286515: In libm's exp2(3), avoid left-shifting a negative integer, which is undefined. Replace it with the intended value, in a defined way. Reviewed by: bde Modified: stable/9/lib/msun/src/s_exp2.c Directory Properties: stable/9/ (props changed) stable/9/lib/ (props changed) stable/9/lib/msun/ (props changed) Changes in other areas also in this revision: Modified: stable/10/lib/msun/src/s_exp2.c stable/8/lib/msun/src/s_exp2.c Directory Properties: stable/10/ (props changed) stable/8/ (props changed) stable/8/lib/ (props changed) stable/8/lib/msun/ (props changed) Modified: stable/9/lib/msun/src/s_exp2.c ============================================================================== --- stable/9/lib/msun/src/s_exp2.c Wed Aug 12 19:00:47 2015 (r286687) +++ stable/9/lib/msun/src/s_exp2.c Wed Aug 12 19:06:35 2015 (r286688) @@ -375,14 +375,14 @@ exp2(double x) /* Compute r = exp2(y) = exp2t[i0] * p(z - eps[i]). */ t = tbl[i0]; /* exp2t[i0] */ z -= tbl[i0 + 1]; /* eps[i0] */ - if (k >= -1021 << 20) + if (k >= -(1021 << 20)) INSERT_WORDS(twopk, 0x3ff00000 + k, 0); else INSERT_WORDS(twopkp1000, 0x3ff00000 + k + (1000 << 20), 0); r = t + t * z * (P1 + z * (P2 + z * (P3 + z * (P4 + z * P5)))); /* Scale by 2**(k>>20). */ - if(k >= -1021 << 20) { + if(k >= -(1021 << 20)) { if (k == 1024 << 20) return (r * 2.0 * 0x1p1023); return (r * twopk);