Subversion Repositories openrisc_2011-10-31

/* { dg-do compile } */

/* { dg-options "-O2 -fipa-type-escape" } */

extern double log10 (double __x);

extern double ceil (double __x);

extern double floor (double __x);

extern void free (void *__ptr);

extern void *my_malloc (unsigned int);

extern int num_rr_nodes;

static float get_cblock_trans (int *num_inputs_to_cblock,

                               int max_inputs_to_cblock,

                               float trans_cblock_to_lblock_buf,

                               float trans_sram_bit);

static float trans_per_mux (int num_inputs, float trans_sram_bit);

void

count_routing_transistors (int num_switch, float R_minW_nmos,

                           float R_minW_pmos)

{

  int *num_inputs_to_cblock;

  int iswitch, i, j, iseg, max_inputs_to_cblock;

  float input_cblock_trans;

  const float trans_sram_bit = 6.;

  float trans_cblock_to_lblock_buf;

  input_cblock_trans =

    get_cblock_trans (num_inputs_to_cblock, max_inputs_to_cblock,

                      trans_cblock_to_lblock_buf, trans_sram_bit);

}

static float

get_cblock_trans (int *num_inputs_to_cblock, int max_inputs_to_cblock,

                  float trans_cblock_to_lblock_buf, float trans_sram_bit)

{

  float *trans_per_cblock;

  float trans_count;

  int i, num_inputs;

  trans_per_cblock =

    (float *) my_malloc ((max_inputs_to_cblock + 1) * sizeof (float));

  for (i = 1; i <= max_inputs_to_cblock; i++)

    trans_per_cblock[i] =

      trans_per_mux (i, trans_sram_bit) + trans_cblock_to_lblock_buf;

  for (i = 0; i < num_rr_nodes; i++)

    {

      num_inputs = num_inputs_to_cblock[i];

      trans_count += trans_per_cblock[num_inputs];

    }

  free (trans_per_cblock);

  return (trans_count);

}

static float

trans_per_mux (int num_inputs, float trans_sram_bit)

{

  int nlevels, ilevel, current_inps;

  float ntrans = 0;

  if (num_inputs <= 1)

    return (0);

  nlevels = ceil (log10 (num_inputs) / log10 (2.) - 0.00001);

  current_inps = num_inputs;

  for (ilevel = 1; ilevel <= nlevels; ilevel++)

    {

      ntrans += 2 * floor (current_inps / 2.);

      current_inps = ceil (current_inps / 2.);

    }

  ntrans += trans_sram_bit * nlevels;

  return (ntrans);

}