From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 12109 invoked by alias); 14 Jun 2011 00:38:21 -0000 Received: (qmail 12100 invoked by uid 22791); 14 Jun 2011 00:38:20 -0000 X-SWARE-Spam-Status: No, hits=-2.7 required=5.0 tests=ALL_TRUSTED,AWL,BAYES_00 X-Spam-Check-By: sourceware.org Received: from localhost (HELO gcc.gnu.org) (127.0.0.1) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Tue, 14 Jun 2011 00:38:07 +0000 From: "ramana at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/49398] [4.7 ] bootstrap broken for arm-linux-gnueabi with thumb mode. X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: target X-Bugzilla-Keywords: ice-on-valid-code X-Bugzilla-Severity: normal X-Bugzilla-Who: ramana at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Changed-Fields: Status Last reconfirmed Ever Confirmed Message-ID: In-Reply-To: References: X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/ Auto-Submitted: auto-generated Content-Type: text/plain; charset="UTF-8" MIME-Version: 1.0 Date: Tue, 14 Jun 2011 00:38:00 -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 X-SW-Source: 2011-06/txt/msg01153.txt.bz2 http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49398 Ramana Radhakrishnan changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |NEW Last reconfirmed| |2011.06.14 00:37:35 Ever Confirmed|0 |1 --- Comment #2 from Ramana Radhakrishnan 2011-06-14 00:37:35 UTC --- Hmmm the *ldrd pattern appears to allow this which is just unpredictable behaviour. (insn:TI 42 38 43 2 (parallel [ (set (reg/v/f:SI 4 r4 [orig:143 regs ] [143]) (mem/f/c/i:SI (plus:SI (reg/f:SI 26 afp) (const_int 12 [0xc])) [3 regs+0 S4 A32])) (set (reg/v:SI 4 r4 [orig:144 stop ] [144]) (mem/c/i:SI (plus:SI (reg/f:SI 26 afp) (const_int 16 [0x10])) [2 stop+0 S4 A32])) ]) ../../../gcc-4.7~/libiberty/regex.c:4959 396 {*ldrd} (expr_list:REG_UNUSED (reg/v/f:SI 4 r4 [orig:143 regs ] [143]) (nil))) You can't have Rt == Rt2 in Thumb2 - that is just broken behaviour. at the very least you need the following patch to get builds going further. Index: arm.c =================================================================== --- arm.c (revision 174940) +++ arm.c (working copy) @@ -23865,6 +23865,9 @@ if (TARGET_ARM) max_offset = 255; + + if (regno1 == regno2) + return false; if (off1 != NULL_RTX) offset1 = INTVAL (off1);