From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 44957 invoked by alias); 21 Aug 2015 09:55:18 -0000 Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Id: List-Archive: List-Post: List-Help: Sender: gcc-bugs-owner@gcc.gnu.org Received: (qmail 44892 invoked by uid 48); 21 Aug 2015 09:55:14 -0000 From: "jiwang at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/67305] New: [6 Regression] gcc.c-torture/compile/20121027-1.c ICE Date: Fri, 21 Aug 2015 09:55:00 -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: 6.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: jiwang 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 cc target_milestone cf_gcctarget Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-SW-Source: 2015-08/txt/msg01476.txt.bz2 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67305 Bug ID: 67305 Summary: [6 Regression] gcc.c-torture/compile/20121027-1.c ICE Product: gcc Version: 6.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: jiwang at gcc dot gnu.org CC: vmakarov at redhat dot com Target Milestone: --- Target: arm-none-eabi since r226850, seen on arm-none-eabi only currently. it can be easily reproduced by the following command. -mfpu and -mfloat are necessary. ./cc1 -O3 -nostdinc 20121027-1.c -march=armv8-a -mthumb -mfpu=crypto-neon-fp-armv8 -mfloat-abi=hard cross cc1 is generated from ../gcc/configure --target=arm-none-eabi --enable-languages=c,c++ t.c:13:1: internal compiler error: in decompose_normal_address, at rtlanal.c:6090 } ^ 0xc94a37 decompose_normal_address /space/rguenther/tramp3d/trunk/gcc/rtlanal.c:6090 0xc94d25 decompose_address(address_info*, rtx_def**, machine_mode, unsigned char, rtx_code) /space/rguenther/tramp3d/trunk/gcc/rtlanal.c:6167 0xc94dc3 decompose_mem_address(address_info*, rtx_def*) /space/rguenther/tramp3d/trunk/gcc/rtlanal.c:6187 0xb61149 process_address_1 /space/rguenther/tramp3d/trunk/gcc/lra-constraints.c:2867 0xb61c4e process_address /space/rguenther/tramp3d/trunk/gcc/lra-constraints.c:3124 0xb62607 curr_insn_transform /space/rguenther/tramp3d/trunk/gcc/lra-constraints.c:3419 0xb65250 lra_constraints(bool) /space/rguenther/tramp3d/trunk/gcc/lra-constraints.c:4421 Richard's initial comments that looks like a latent issue to me in an area of GCC I am not familiar with. I suggest to open a bugreport and CC Vladimir. The r226850 change caused us to eliminate an induction variable early (I suspect IVOPTs would have done this later anyway, but I did not verify that): Replaced redundant PHI node defining bl_2 with c_1 Replaced c_1 + 1 with bl_15 in all uses of c_16 = c_1 + 1; Removing dead stmt c_16 = c_1 + 1; Removing dead stmt bl_2 = PHI <0(2), bl_15(3)>