Here is tescase for this ICE, which was first mentioned in
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=20126#c26 . 
It still fails on mainline.

------------------------------------------------------------------------------
// compile with -O2

static struct
{
  unsigned int p, f;
} s[] ={
  { 0x08, 625 },
  { 0x09, 1250 },
  { 0x0a, 2500 },
  { 0x0b, 3030 },
  { 0x0c, 5000 }
};

unsigned int foo (unsigned int f)
{
  int i, n;
  
  n = sizeof (s) / sizeof (s[0]);
  for (i = 0; i < n; i++)
    if (f == s[i].f)
      return 100000000 / s[i].p;
  return 10000000 / f;
}