[Bug other/60785] New: ICE in gsi_for_stmt w/ -O2 -ftree-loop-linear

[asolokha at gmx dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60785

            Bug ID: 60785
           Summary: ICE in gsi_for_stmt w/ -O2 -ftree-loop-linear
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: other
          Assignee: unassigned at gcc dot gnu.org
          Reporter: asolokha at gmx dot com

gcc-4.9.0-alpha20140406 segfaults on x86_64 when compiling the following code
w/ -O2 -ftree-loop-linear:

static int
aqc(void)
{
  return 1;
}

void
gkd(void)
{
  int wu0;
  static int b1y;
  static int gw2;
  static int *ydw = &gw2;
  static int **m3l = &ydw;
  **m3l = 0;
  for (b1y = 0; b1y < 1; ++b1y)
  {
    int *cpj = &gw2;
    if (*ydw |= aqc())
    {
      *cpj = 0;
      *ydw = wu0;
    }
  }
}

Stack trace from cc1 is not fully usable, but here are top 5 frames anyway:
#0  0x000000000072c22c in gsi_for_stmt(gimple_statement_base*) ()
#1  0x0000000000ce708b in ?? ()
#2  0x0000000000ce780f in ?? ()
#3  0x0000000000ceed3e in build_poly_scop(scop*) ()
#4  0x0000000000cd8417 in graphite_transform_loops() ()

This is a regression from previous branches, 4.7.3 and 4.8.2 don't fail here.