[Bug c/38774] New: ice in df_refs_verify, at df-scan.c:4307

["regehr at cs dot utah dot edu" <gcc-bugzilla at gcc dot gnu dot org>]

This is seen using r143187 on Ubuntu Hardy on x86.

PR 32431 reports a similar failure but at a different line number, and for the
68HC11 target.

regehr@john-home:~/volatile/tmp117$ current-gcc -c -O2 -march=i686 small.c
small.c: In function ?foo?:
small.c:17: internal compiler error: in df_refs_verify, at df-scan.c:4307
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

regehr@john-home:~/volatile/tmp117$ cat small.c

int safe_add_func_int64_t_s_s (int _si1, int _si2)
{
  return 1 > 9223372036854775807LL - _si2 && 1 - _si2 ? : 1 + _si2;
}

volatile int g_55;

void func_42 (int p_43, int p_44, int p_46, int p_47)
{
  p_44 & 1 && g_55, !1;
}

void foo (int p_38)
{
  int l_84 = 0;
  func_42 (1, safe_add_func_int64_t_s_s (p_38, 1 >= safe (1)), l_84, 1);
}

regehr@john-home:~/volatile/tmp117$ current-gcc -v

Using built-in specs.
Target: i686-pc-linux-gnu
Configured with: ../configure --program-prefix=current-
--enable-languages=c,c++ --prefix=/home/regehr : (reconfigured) ../configure
--program-prefix=current- --enable-languages=c,c++ --prefix=/home/regehr :
(reconfigured) ../configure --program-prefix=current- --enable-languages=c,c++
--prefix=/home/regehr : (reconfigured) ../configure --program-prefix=current-
--prefix=/home/regehr --enable-languages=c,c++ --no-create --no-recursion :
(reconfigured) ../configure --program-prefix=current- --prefix=/home/regehr
--enable-languages=c,c++ --no-create --no-recursion : (reconfigured)
../configure --program-prefix=current- --prefix=/home/regehr
--enable-languages=c,c++ --no-create --no-recursion : (reconfigured)
../configure --program-prefix=current- --prefix=/home/regehr
--enable-languages=c,c++ --no-create --no-recursion : (reconfigured)
../configure --program-prefix=current- --prefix=/home/regehr
--enable-languages=c,c++ --no-create --no-recursion
Thread model: posix
gcc version 4.4.0 20090108 (experimental) (GCC)


-- 
           Summary: ice in df_refs_verify, at df-scan.c:4307
           Product: gcc
           Version: unknown
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: regehr at cs dot utah dot edu
 GCC build triplet: i686-pc-linux-gnu
  GCC host triplet: i686-pc-linux-gnu
GCC target triplet: i686-pc-linux-gnu


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38774