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typedef struct rtx_def *rtx;

enum rtx_code { SUBREG };

typedef union rtunion_def {

    long rtint;

    unsigned long rtuint;

    rtx rtx;

} rtunion;

struct rtx_def {

    enum rtx_code code: 8;

    rtunion fld[1];

};

typedef struct simple_bitmap_def {

    unsigned long long elms[1];

} *sbitmap;

struct df_link {

    struct df_link *next;

    rtx reg;

};

typedef enum { UNDEFINED,   CONSTANT,   VARYING } latticevalue;

typedef struct {

    latticevalue lattice_val;

} value;

static value *values;

static sbitmap ssa_edges;

void defs_to_varying (struct df_link *start)

{

  struct df_link *currdef;

  for (currdef = start;

       currdef;

       currdef = currdef->next)

    {

      rtx reg = currdef->reg;

      if (values[(reg->code == SUBREG

                  ? reg->fld[0].rtx

                  : reg)->fld[0].rtuint].lattice_val != VARYING)

        ssa_edges->elms [(reg->code == SUBREG

                          ? reg->fld[0].rtx

                          : reg)->fld[0].rtuint / 64]

            |= ((unsigned long long) 1

                << (reg->code == SUBREG

                    ? reg->fld[0].rtx

                    : reg)->fld[0].rtuint % 64);

      values[(reg->code == SUBREG

              ? reg->fld[0].rtx

              : reg)->fld[0].rtuint].lattice_val = VARYING;

    }

}