[Bug tree-optimization/61279] New: [4.10 Regression] ICE in loop_preheader_edge, at cfgloop.c:1668 w/ -O1 -ftree-loop-vectorize

[asolokha at gmx dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61279

            Bug ID: 61279
           Summary: [4.10 Regression] ICE in loop_preheader_edge, at
                    cfgloop.c:1668 w/ -O1 -ftree-loop-vectorize
           Product: gcc
           Version: 4.10.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: tree-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com

gcc-4.10.0-alpha20140518 fails when compiling the following code w/
-ftree-loop-vectorize -O1 and above:

int z;
int d;

int
n(void)
{
  int s;
  int *q;
  for (s = 0; s < 1; ++s) {
    int b;
    for (d = 0; d < 1; ++d)
      return 0;
    for (b = 0; b < 1; ++b) {
      int o[1] = { 0 };
      q = &o[b];
    }
    for (z = 0; z < 1; ++z)
      return 0;
  }
  return *q;
}

bb234e61.c: In function 'n':
bb234e61.c:21:1: internal compiler error: in loop_preheader_edge, at
cfgloop.c:1668

4.10.0-alpha20140411 works well here.