[Bug c/47427] New: ICE in process_constraint, at tree-ssa-structalias.c:2901

[regehr at cs dot utah.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47427

           Summary: ICE in process_constraint, at
                    tree-ssa-structalias.c:2901
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: reg...@cs.utah.edu
                CC: cheny...@cs.utah.edu


[regehr@gamow tmp443]$ current-gcc -c -O3 small.c

small.c: In function 'foo':
small.c:20:6: internal compiler error: in process_constraint, at
tree-ssa-structalias.c:2901
Please submit a full bug report,
with preprocessed source if appropriate.
See <http://gcc.gnu.org/bugs.html> for instructions.

[regehr@gamow tmp443]$ current-gcc -v

Using built-in specs.
COLLECT_GCC=current-gcc
COLLECT_LTO_WRAPPER=/uusoc/exports/scratch/regehr/z/compiler-install/gcc-r169143-install/bin/../libexec/gcc/x86_64-unknown-linux-gnu/4.6.0/lto-wrapper
Target: x86_64-unknown-linux-gnu
Configured with: ../configure --with-libelf=/usr/local --enable-lto
--prefix=/home/regehr/z/compiler-install/gcc-r169143-install
--program-prefix=r169143- --enable-languages=c,c++
Thread model: posix
gcc version 4.6.0 20110123 (experimental) (GCC) 

[regehr@gamow tmp443]$ cat small.c


long g_128;
int *g;

int func_73 (unsigned char p_74, const int p_75)
{
 lbl_159:for (; g_128; g = (int *)g_128)
    for (g = 0; g_128; g_128++)
      {
    int l_144 = 1;
    if (g_128)
      {
        if (l_144)
          goto lbl_159;
        return p_75;
      }
      }
  return p_74;
}

void foo (void)
{
  if (func_73 (0, 1))
    func_73 (1, 0);
}