[Bug tree-optimization/34648] New: [4.3 Regression] ICE in find_or_generate_expression

["jakub at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>]

The following testcase distilled from tinyfugue-5.0 ICEs with
internal compiler error: in find_or_generate_expression, at tree-ssa-pre.c:2255

/* { dg-do compile } */
/* { dg-options "-O2 -fexceptions" } */

extern const unsigned short int **bar (void) __attribute__ ((const));
const char *a;
int b;
char c;

char
foo (int *x)
{
  char r;

  c = '\0';
  if (!b)
    {
      while (((*bar ())[a[*x]] & 0x2000) != 0)
        (*x)++;
      if (a[++(*x)] == '-')
        {
          (*x)++;
          if (a[*x] && !((*bar ())[a[*x]] & 0x2000))
            return '?';
        }
      if (!a[*x] || ((*bar ())[a[*x]] & 0x2000))
        {
          while (((*bar ())[a[*x]] & 0x2000))
            ++(*x);
          return '\0';
        }
    }

  r = a[*x];
  b = a[*x] && !((*bar ())[a[*x]] & 0x2000);
  return r;
}


-- 
           Summary: [4.3 Regression] ICE in find_or_generate_expression
           Product: gcc
           Version: 4.3.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jakub at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34648