From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-441081-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 19643 invoked by alias); 21 Jan 2014 02:19:30 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
Received: (qmail 19623 invoked by uid 48); 21 Jan 2014 02:19:24 -0000
From: "terry.guo at arm dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/59896] New: Thumb-1 LRA unable to generate reloads for jump_insn
Date: Tue, 21 Jan 2014 02:19:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 4.9.0
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: terry.guo at arm dot com
X-Bugzilla-Status: UNCONFIRMED
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 attachments.created
Message-ID: <bug-59896-4@http.gcc.gnu.org/bugzilla/>
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: 2014-01/txt/msg02223.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=59896

            Bug ID: 59896
           Summary: Thumb-1 LRA unable to generate reloads for jump_insn
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: terry.guo at arm dot com

Created attachment 31903
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=31903&action=edit
A preprocessed test case

Use trunk gcc to compile attached case with command "arm-none-eabi-gcc -mthumb
-O2 -S dtoa.i", we will get below error:

/home/build/work/GCC-4-9-build/src/newlib/newlib/libc/stdlib/dtoa.c: In
function '_dtoa_r':
/home/build/work/GCC-4-9-build/src/newlib/newlib/libc/stdlib/dtoa.c:862:1:
error: unable to generate reloads for:
(jump_insn 424 2763 425 32 (parallel [
            (set (pc)
                (if_then_else (ge (plus:SI (reg:SI 491 [ D.6302 ])
                            (const_int -1 [0xffffffffffffffff]))
                        (const_int 0 [0]))
                    (label_ref:SI 427)
                    (pc)))
            (set (reg/v:SI 178 [ s2 ])
                (plus:SI (reg:SI 491 [ D.6302 ])
                    (const_int -1 [0xffffffffffffffff])))
            (clobber (reg:SI 833))
        ])
/home/build/work/GCC-4-9-build/src/newlib/newlib/libc/stdlib/dtoa.c:369 225
{*addsi3_cbranch}
     (expr_list:REG_UNUSED (reg:SI 833)
        (expr_list:REG_DEAD (reg:SI 491 [ D.6302 ])
            (int_list:REG_BR_PROB 7300 (nil))))
 -> 427)
/home/build/work/GCC-4-9-build/src/newlib/newlib/libc/stdlib/dtoa.c:862:1:
internal compiler error: in curr_insn_transform, at lra-constraints.c:3220
0xaa7a9b _fatal_insn(char const*, rtx_def const*, char const*, int, char
const*)
    /myssd/terguo01/toolchain-build/thumb1-uxtb/src/gcc/gcc/rtl-error.c:109
0x9a9f71 curr_insn_transform
   
/myssd/terguo01/toolchain-build/thumb1-uxtb/src/gcc/gcc/lra-constraints.c:3220
0x9acb2a lra_constraints(bool)
   
/myssd/terguo01/toolchain-build/thumb1-uxtb/src/gcc/gcc/lra-constraints.c:4115
0x999647 lra(_IO_FILE*)
    /myssd/terguo01/toolchain-build/thumb1-uxtb/src/gcc/gcc/lra.c:2339
0x947791 do_reload
    /myssd/terguo01/toolchain-build/thumb1-uxtb/src/gcc/gcc/ira.c:5457
0x947ada rest_of_handle_reload
    /myssd/terguo01/toolchain-build/thumb1-uxtb/src/gcc/gcc/ira.c:5598
0x947b24 execute
    /myssd/terguo01/toolchain-build/thumb1-uxtb/src/gcc/gcc/ira.c:5627
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See <http://gcc.gnu.org/bugs.html> for instructions.

The gcc version is:
gcc version 4.9.0 20140120 (experimental) 

If we disable LRA, there is no such issue.