[Bug tree-optimization/68823] [6/7 Regression][graphite] tramp3d-v4 compiled with -floop-nest-optimize crashes

[spop at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68823

--- Comment #9 from Sebastian Pop <spop at gcc dot gnu.org> ---
/* Determines the base object and the list of indices of memory reference
   DR, analyzed in LOOP and instantiated in loop nest NEST.  */

static void
dr_analyze_indices (struct data_reference *dr, loop_p nest, loop_p loop)

This function initializes the subscripts with their access functions:
  DR_ACCESS_FNS (dr) = access_fns;

The number of subscripts (or "dimensions") is then the length of that array:
#define DR_NUM_DIMENSIONS(DR)      DR_ACCESS_FNS (DR).length ()