[Bug tree-optimization/67921] "internal compiler error: in build_polynomial_chrec, at tree-chrec.h:147" when using -fsanitize=undefined

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67921

Markus Trippelsdorf <trippels at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2015-10-11
                 CC|                            |mpolacek at gcc dot gnu.org,
                   |                            |trippels at gcc dot gnu.org
     Ever confirmed|0                           |1

--- Comment #1 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
typedef struct {
  int fullband_channels;
  int masking_curve_cb[][6];
} DCAEncContext;
void fn1(DCAEncContext *p1) {
  int a;
  for (; a < 2; a++)
    for (; p1->fullband_channels;) {
      int *b = p1->masking_curve_cb[a];
      int c[66];
      int j = 0;
      for (; j < 56; j++)
        fn2(b[j] - c[j]);
    }
}