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From: "regehr at cs dot utah.edu" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c/56144] New: ICE in get_reload_reg, at lra-constraints.c:421
Date: Wed, 30 Jan 2013 05:06:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D56144

             Bug #: 56144
           Summary: ICE in get_reload_reg, at lra-constraints.c:421
    Classification: Unclassified
           Product: gcc
           Version: 4.8.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: regehr@cs.utah.edu
                CC: chenyang@cs.utah.edu


regehr@home:~/z/reduce/r200$ gcc -O small.c
small.c: In function =E2=80=98main=E2=80=99:
small.c:43:1: internal compiler error: in get_reload_reg, at
lra-constraints.c:421
 }
 ^
0x7f66a2 get_reload_reg
    /home/regehr/z/compiler-source/gcc/gcc/lra-constraints.c:421
0x7f6838 process_addr_reg
    /home/regehr/z/compiler-source/gcc/gcc/lra-constraints.c:1106
0x7f6b94 process_address
    /home/regehr/z/compiler-source/gcc/gcc/lra-constraints.c:2360
0x7f977f curr_insn_transform
    /home/regehr/z/compiler-source/gcc/gcc/lra-constraints.c:2720
0x7fbe04 lra_constraints(bool)
    /home/regehr/z/compiler-source/gcc/gcc/lra-constraints.c:3554
0x7eeeae lra(_IO_FILE*)
    /home/regehr/z/compiler-source/gcc/gcc/lra.c:2279
0x7b7218 do_reload
    /home/regehr/z/compiler-source/gcc/gcc/ira.c:4623
0x7b7218 rest_of_handle_reload
    /home/regehr/z/compiler-source/gcc/gcc/ira.c:4736
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.


regehr@home:~/z/reduce/r200$ cat small.c
int a;
union U0
{
  volatile unsigned f2;
  volatile unsigned f4;
};
volatile b;
static union U0 c;
volatile unsigned d, f;
volatile e;
volatile g;
volatile h;
volatile i;
volatile j;
volatile k;
volatile l;
volatile m;
volatile n;
volatile o;
volatile p;
main ()
{
  a =3D b;
  a +=3D c.f2;
  a +=3D c.f4;
  unsigned q =3D h;
  a +=3D q;
  q =3D g;
  a +=3D q;
  a +=3D f;
  q =3D e;
  a +=3D q;
  a +=3D d;
  a +=3D 2L;
  a +=3D j;
  a +=3D i;
  a +=3D k;
  a +=3D p;
  a +=3D o;
  a +=3D n;
  a +=3D m;
  a +=3D l;
}


regehr@home:~/z/reduce/r200$ gcc -v
Using built-in specs.
COLLECT_GCC=3Dgcc
COLLECT_LTO_WRAPPER=3D/home/regehr/z/compiler-install/gcc-r195565-install/l=
ibexec/gcc/x86_64-unknown-linux-gnu/4.8.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: /home/regehr/z/compiler-source/gcc/configure
--with-libelf=3D/usr/local --enable-lto
--prefix=3D/home/regehr/z/compiler-install/gcc-r195565-install
--enable-languages=3Dc,c++
Thread model: posix
gcc version 4.8.0 20130129 (experimental) (GCC)