[Bug target/65803] New: blackfin: internal compiler error: segment fault linux kernel

[gang.chen.5i5j at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65803

            Bug ID: 65803
           Summary: blackfin: internal compiler error: segment fault linux
                    kernel
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gang.chen.5i5j at gmail dot com

The code:

  [root@localhost gcc]# cat lbalance.i
  struct a {
   short count;
  };

  struct reiserfs_de_head {
   unsigned short deh_location;
  } __attribute__ ((__packed__));

  void leaf_cut_from_buffer(struct a *ih, int from)
  {
   struct reiserfs_de_head *deh = (struct reiserfs_de_head *)ih;
   int i;

   for (i = ih->count - 1; i > from; i--)
    deh[i].deh_location--;

   for (i = 0; i < from; i++)
    deh[i].deh_location--;
  }

The error:

  [root@localhost gcc]# /upstream/build-gcc-blackfin/gcc/cc1 lbalance.i -Os
-fno-strict-overflow
  lbalance.i: In function 'leaf_cut_from_buffer':
  lbalance.i:19:1: internal compiler error: Segmentation fault
   }
   ^
  0xa54a9f crash_signal
        ../../gcc-blackfin/gcc/toplev.c:383
  0x77af8b INSN_UID
        ../../gcc-blackfin/gcc/rtl.h:1329
  0x77af8b insn_current_reference_address(rtx_insn*)
        ../../gcc-blackfin/gcc/final.c:686  0xd39604
insn_current_length(rtx_insn*)
        /upstream/build-gcc-blackfin/gcc/insn-attrtab.c:84
  0x77c12e shorten_branches(rtx_insn*)
        ../../gcc-blackfin/gcc/final.c:1478
  0x77c51f rest_of_handle_shorten_branches
        ../../gcc-blackfin/gcc/final.c:4580
  0x77c51f execute
        ../../gcc-blackfin/gcc/final.c:4609
  Please submit a full bug report,

The version:

  [root@localhost gcc]# /upstream/release-blackfin/bin/bfin-gchen-elf-gcc -v
  Using built-in specs.
  COLLECT_GCC=/upstream/release-blackfin/bin/bfin-gchen-elf-gcc
 
COLLECT_LTO_WRAPPER=/upstream/release-blackfin/libexec/gcc/bfin-gchen-elf/5.0.0/lto-wrapper
  Target: bfin-gchen-elf
  Configured with: ../gcc-blackfin/configure --target=bfin-gchen-elf
--disable-nls --disable-threads --disable-shared --disable-libssp
--disable-libquadmath --disable-libgomp --disable-libatomic
--prefix=/upstream/release-blackfin --without-headers
target_alias=bfin-gchen-elf --enable-languages=c,lto
  Thread model: single
  gcc version 5.0.0 20150401 (experimental) (GCC)