From owner-freebsd-toolchain@freebsd.org Tue Apr 24 08:45:21 2018 Return-Path: Delivered-To: freebsd-toolchain@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 A2CFFFC046D for ; Tue, 24 Apr 2018 08:45:21 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mailman.ysv.freebsd.org (mailman.ysv.freebsd.org [IPv6:2001:1900:2254:206a::50:5]) by mx1.freebsd.org (Postfix) with ESMTP id 376BF83F55 for ; Tue, 24 Apr 2018 08:45:21 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: by mailman.ysv.freebsd.org (Postfix) id EFFCBFC046C; Tue, 24 Apr 2018 08:45:20 +0000 (UTC) Delivered-To: toolchain@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 DD734FC046B for ; Tue, 24 Apr 2018 08:45:20 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from mxrelay.ysv.freebsd.org (mxrelay.ysv.freebsd.org [IPv6:2001:1900:2254:206a::19:3]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "mxrelay.ysv.freebsd.org", Issuer "Let's Encrypt Authority X3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 7573983F51 for ; Tue, 24 Apr 2018 08:45:20 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mxrelay.ysv.freebsd.org (Postfix) with ESMTPS id A20891548F for ; Tue, 24 Apr 2018 08:45:19 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id w3O8jJGM026016 for ; Tue, 24 Apr 2018 08:45:19 GMT (envelope-from bugzilla-noreply@freebsd.org) Received: (from www@localhost) by kenobi.freebsd.org (8.15.2/8.15.2/Submit) id w3O8jJxA026015 for toolchain@FreeBSD.org; Tue, 24 Apr 2018 08:45:19 GMT (envelope-from bugzilla-noreply@freebsd.org) X-Authentication-Warning: kenobi.freebsd.org: www set sender to bugzilla-noreply@freebsd.org using -f From: bugzilla-noreply@freebsd.org To: toolchain@FreeBSD.org Subject: [Bug 227723] clang 6.0 breaks php56/opcache Date: Tue, 24 Apr 2018 08:45:19 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: bin X-Bugzilla-Version: 11.1-STABLE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: lampa@fit.vutbr.cz X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: toolchain@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-toolchain@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: Maintenance of FreeBSD's integrated toolchain List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 24 Apr 2018 08:45:22 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D227723 --- Comment #4 from lampa@fit.vutbr.cz --- test case was for constant, which was optimized to immediate, here is anoth= er with variable: #include #include #define EX_TMP_VAR(ex, n) ((temp_variable*)(((char*)(ex)) + ((int)(n)))) #define EX_TMP_VAR_NUM(ex, n) (EX_TMP_VAR(ex, 0) - (1 + (n))) #define VAR_NUM(v) ((unsigned int)(EX_TMP_VAR_NUM(0, 0) - EX_TMP_VAR(0, v))) typedef struct TV { long tmp; char tmp3[30]; } temp_variable; int num =3D -1000; int main() { printf("%x\n", VAR_NUM(num)); return 0; } clang50 result is 18 clang60 result is 60000018 The only difference in generated code (clang50 first, clang60 second): < movslq num(%rip), %rax --- > movl num(%rip), %eax movq $-40, %rcx subq %rax, %rcx shrq $3, %rcx It looks like num is not sign extended before pointer arithmetic. --=20 You are receiving this mail because: You are the assignee for the bug.=