From owner-freebsd-bugs@freebsd.org Sun Mar 6 20:57:30 2016 Return-Path: Delivered-To: freebsd-bugs@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 63497AC27D6 for ; Sun, 6 Mar 2016 20:57:30 +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 mx1.freebsd.org (Postfix) with ESMTPS id 39D25627 for ; Sun, 6 Mar 2016 20:57:30 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id u26KvU9e005011 for ; Sun, 6 Mar 2016 20:57:30 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-bugs@FreeBSD.org Subject: [Bug 207755] clang 3.8.0 messes up __builtin_dwarf_cfa () result when used as a function argument, at least for TARGET_ARCH=powerpc and powerpc64 Date: Sun, 06 Mar 2016 20:57:30 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: bin X-Bugzilla-Version: 11.0-CURRENT X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Only Me X-Bugzilla-Who: markmi@dsl-only.net X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-bugs@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter Message-ID: 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-bugs@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Bug reports List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sun, 06 Mar 2016 20:57:30 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D207755 Bug ID: 207755 Summary: clang 3.8.0 messes up __builtin_dwarf_cfa () result when used as a function argument, at least for TARGET_ARCH=3Dpowerpc and powerpc64 Product: Base System Version: 11.0-CURRENT Hardware: ppc OS: Any Status: New Severity: Affects Only Me Priority: --- Component: bin Assignee: freebsd-bugs@FreeBSD.org Reporter: markmi@dsl-only.net [llvm buszilla: 26761] # more builtin_dwarf_cfa.cpp #include extern void g(void*); void f0() { g(__builtin_dwarf_cfa()); } void f1() { auto f1_cfa =3D __builtin_dwarf_cfa(); g(f1_cfa); } f0 and f1 pass g different offsets from the frame pointer. See below for a TARGET_ARCH=3Dpowerpc example. g++ behaves like f1 for both f1 and f0. # clang++ -c -g -std=3Dc++11 -Wall -pedantic builtin_dwarf_cfa.cpp results in: Disassembly of section .text: 00000000 <_Z2f0v> mflr r0 00000004 <_Z2f0v+0x4> stw r31,-4(r1) 00000008 <_Z2f0v+0x8> stw r0,4(r1) 0000000c <_Z2f0v+0xc> stwu r1,-16(r1) 00000010 <_Z2f0v+0x10> mr r31,r1 00000014 <_Z2f0v+0x14> mr r3,r31 00000018 <_Z2f0v+0x18> lwz r3,0(r3) 0000001c <_Z2f0v+0x1c> bl 0000001c <_Z2f0v+0x1c> 00000020 <_Z2f0v+0x20> addi r1,r1,16 00000024 <_Z2f0v+0x24> lwz r0,4(r1) 00000028 <_Z2f0v+0x28> lwz r31,-4(r1) 0000002c <_Z2f0v+0x2c> mtlr r0 00000030 <_Z2f0v+0x30> blr 00000034 <_Z2f1v> mflr r0 00000038 <_Z2f1v+0x4> stw r31,-4(r1) 0000003c <_Z2f1v+0x8> stw r0,4(r1) 00000040 <_Z2f1v+0xc> stwu r1,-16(r1) 00000044 <_Z2f1v+0x10> mr r31,r1 00000048 <_Z2f1v+0x14> mr r3,r31 0000004c <_Z2f1v+0x18> lwz r3,0(r3) 00000050 <_Z2f1v+0x1c> stw r3,8(r31) 00000054 <_Z2f1v+0x20> bl 00000054 <_Z2f1v+0x20> 00000058 <_Z2f1v+0x24> addi r1,r1,16 0000005c <_Z2f1v+0x28> lwz r0,4(r1) 00000060 <_Z2f1v+0x2c> lwz r31,-4(r1) 00000064 <_Z2f1v+0x30> mtlr r0 00000068 <_Z2f1v+0x34> blr --=20 You are receiving this mail because: You are the assignee for the bug.=