From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 148783858413; Sat, 13 Nov 2021 20:39:17 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 148783858413 From: "law at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/103226] New: [12 Regression] Recent change to copy-headers causes execution failure for gcc.dg/torture/pr80974 Date: Sat, 13 Nov 2021 20:39:16 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: tree-optimization X-Bugzilla-Version: 12.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: law at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter target_milestone Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: gcc-bugs@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-bugs mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 13 Nov 2021 20:39:17 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103226 Bug ID: 103226 Summary: [12 Regression] Recent change to copy-headers causes execution failure for gcc.dg/torture/pr80974 Product: gcc Version: 12.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: law at gcc dot gnu.org Target Milestone: --- This change: commit e82c382971664d6fd138cc36020db4b1a91885c6 Author: Aldy Hernandez Date: Wed Nov 10 13:21:59 2021 +0100 Allow loop header copying when first iteration condition is known. Causes gcc.dg/torture/pr80974.c to fail with -O2 on bfin-elf I haven't debugged it in any significant way other than bisection to the ab= ove change and quickly looking at the before/after dumps. Things diverge at the .ch2 dump (no surprise there). You may ultimately have to set up a cross environment to debug this one. The one other tidbit, before this change, the test finishes relatively fast, afterwards it takes a LOT longer. Maybe we're wrapping a loop or something like that. Dunno. It may ultimately not be relevant. Oh, if you end up doing a binutils, gcc & newlib build and want to test thi= ngs yourself using dejagnu you might need a suitable baseboards file. Here's m= ine, which was copied and edited from some other port... # Copyright (C) 1997-2016 Free Software Foundation, Inc. # # This file is part of DejaGnu. # # DejaGnu is free software; you can redistribute it and/or modify it # under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 3 of the License, or # (at your option) any later version. # # DejaGnu is distributed in the hope that it will be useful, but # WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU # General Public License for more details. # # You should have received a copy of the GNU General Public License # along with DejaGnu; if not, write to the Free Software Foundation, # Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA. # This is a list of toolchains that are supported on this board. set_board_info target_install {bfin-elf} # Load the generic configuration for this board. This will define a basic s= et # of routines needed by the tool to communicate with the board. load_generic_config "sim" # basic-sim.exp is a basic description for the standard Cygnus simulator. load_base_board_description "basic-sim" # "fr30" is the name of the sim subdir. setup_sim bfin # No multilib options needed by default. process_multilib_options "" # We only support newlib on this target. We assume that all multilib # options have been specified before we get here. set_board_info compiler "[find_gcc]" set_board_info cflags "[libgloss_include_flags] [newlib_include_flags]" set_board_info ldflags "-msim [libgloss_link_flags] [newlib_link_flags]" # No linker script needed. set_board_info ldscript "" # The simulator doesn't return exit statuses and we need to indicate this; # the standard GCC wrapper will work with this target. set_board_info needs_status_wrapper 1 # Doesn't pass arguments or signals, can't return results, and doesn't # do inferiorio. set_board_info noargs 1 set_board_info gdb,nosignals 1 set_board_info gdb,noresults 1 set_board_info gdb,noinferiorio 1 set_board_info gcc,stack_size 4096=