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[/] [openrisc/] [trunk/] [or1ksim/] [cuc/] [timings.c] - Blame information for rev 582

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1 19 jeremybenn
/* timings.c -- OpenRISC Custom Unit Compiler, timing and size estimation
2
 *    Copyright (C) 2002 Marko Mlinar, markom@opencores.org
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 *
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 *    This file is part of OpenRISC 1000 Architectural Simulator.
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 *
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 *    This program is free software; you can redistribute it and/or modify
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 *    it under the terms of the GNU General Public License as published by
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 *    the Free Software Foundation; either version 2 of the License, or
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 *    (at your option) any later version.
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 *
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 *    This program is distributed in the hope that it will be useful,
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 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
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 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 *    GNU General Public License for more details.
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 *
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 *    You should have received a copy of the GNU General Public License
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 *    along with this program; if not, write to the Free Software
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 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <assert.h>
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#include <math.h>
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#include "config.h"
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#include "port.h"
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#include "arch.h"
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#include "abstract.h"
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#include "sim-config.h"
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#include "cuc.h"
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#include "insn.h"
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static cuc_timing_table *timing_table;
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static double max_bb_delay;
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/* Returns instruction delay */
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double insn_time (cuc_insn *ii)
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{
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  if (ii->opt[2] & OPT_CONST) {
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    if (ii->opt[1] & OPT_CONST) return 0.;
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    else return timing_table[ii->index].delayi;
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  } else return timing_table[ii->index].delay;
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}
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/* Returns instruction size */
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double insn_size (cuc_insn *ii)
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{
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  double s = (ii->opt[2] & OPT_CONST) ? timing_table[ii->index].sizei
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          : timing_table[ii->index].size;
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  if (ii->opt[1] & OPT_CONST) return 0.;
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  if (ii->type & IT_COND && (ii->index == II_CMOV || ii->index == II_ADD)) return s / 32.;
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  else return s;
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}
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/* Returns normal instruction size */
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double ii_size (int index, int imm)
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{
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  if (imm) return timing_table[index].sizei;
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  else return timing_table[index].size;
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}
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/* Returns dataflow tree height in cycles */
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static double max_delay (cuc_func *f, int b)
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{
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  double max_d = 0.;
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  double *d;
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  cuc_bb *bb = &f->bb[b];
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  int i, j;
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  d = (double *) malloc (sizeof (double) * bb->ninsn);
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  for (i = 0; i < bb->ninsn; i++) {
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    double md = 0.;
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    for (j = 0; j < MAX_OPERANDS; j++) {
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      int op = bb->insn[i].op[j];
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      if (bb->insn[i].opt[j] & OPT_REF && op >= 0 && REF_BB (op) == b && REF_I (op) < i) {
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        double t = d[REF_I (op)];
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        if (t > md) md = t;
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      }
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    }
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    d[i] = md + insn_time (&bb->insn[i]);
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    if (d[i] > max_d) max_d = d[i];
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  }
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  free (d);
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  //PRINTF ("max_d%i=%f\n", b, max_d);
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  return max_d;
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}
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/* Calculates memory delay of a single run of a basic block */
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static int memory_delay (cuc_func *f, int b)
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{
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  int i;
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  int d = 0;
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  for (i = 0; i < f->nmsched; i++)
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    if (REF_BB (f->msched[i]) == b) {
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      if (f->mtype[i] & MT_STORE) {
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        if (!(f->mtype[i] & MT_BURST) || f->mtype[i] & MT_BURSTE) d += runtime.cuc.mdelay[2];
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        else d += runtime.cuc.mdelay[3];
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      } else if (f->mtype[i] & MT_LOAD) {
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        if (!(f->mtype[i] & MT_BURST) || f->mtype[i] & MT_BURSTE) d += runtime.cuc.mdelay[0];
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        else d += runtime.cuc.mdelay[1];
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      }
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    }
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  //PRINTF ("md%i=%i\n", b, d);
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  return d;
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}
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/* Cuts the tree and marks registers */
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void cut_tree (cuc_func *f, int b, double sd)
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{
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  int i, j;
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  double *depths;
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  cuc_bb *bb = &f->bb[b];
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  depths = (double *) malloc (sizeof (double) * bb->ninsn);
115
 
116
  for (i = 0; i < bb->ninsn; i++) {
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    double md = 0.;
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    int mg = 0;
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    for (j = 0; j < MAX_OPERANDS; j++) {
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      int op = bb->insn[i].op[j];
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      if (bb->insn[i].opt[j] & OPT_REF && op >= 0 && REF_BB (op) == b && REF_I (op) < i) {
122
        double t = depths[REF_I (op)];
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        if (f->INSN(op).type & IT_CUT) {
124
          if (f->INSN(op).tmp + 1 >= mg) {
125
            if (f->INSN(op).tmp + 1 > mg) md = 0.;
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            mg = f->INSN(op).tmp + 1;
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            if (t > md) md = t;
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          }
129
        } else {
130
          if (f->INSN(op).tmp >= mg) {
131
            if (f->INSN(op).tmp > mg) md = 0.;
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            mg = f->INSN(op).tmp;
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            if (t > md) md = t;
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          }
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        }
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      }
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    }
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    //PRINTF ("%2x md%.1f ", i, md);
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    md += insn_time (&bb->insn[i]);
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    //PRINTF ("md%.1f mg%i %.1f\n", md, mg, sd);
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    bb->insn[i].tmp = mg;
142
    if (md > sd) {
143
      bb->insn[i].type |= IT_CUT;
144
      if (md > runtime.cuc.cycle_duration)
145
        log ("WARNING: operation t%x_%x may need to be registered inbetween\n", b, i);
146
      depths[i] = 0.;
147
    } else depths[i] = md;
148
  }
149
  free (depths);
150
}
151
 
152
/* How many cycles we need now to get through the BB */
153
static int new_bb_cycles (cuc_func *f, int b, int cut)
154
{
155
  long d;
156
  double x = max_delay (f, b);
157
  d = ceil (x / runtime.cuc.cycle_duration);
158
  if (d < 1) d = 1;
159
  if (cut && x > runtime.cuc.cycle_duration) cut_tree (f, b, x / d);
160
 
161
  if (x / d > max_bb_delay) max_bb_delay = x / d;
162
 
163
  return memory_delay (f, b) + d;
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}
165
 
166
/* Cuts the tree and marks registers */
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void mark_cut (cuc_func *f)
168
{
169
  int b, i;
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  for (b = 0; b < f->num_bb; b++)
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    for (i = 0; i < f->bb[b].ninsn; i++)
172
      f->bb[b].insn[i].tmp = 0; /* Set starting groups */
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  if (config.cuc.no_multicycle)
174
    for (b = 0; b < f->num_bb; b++)
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      new_bb_cycles (f, b, 1);
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}
177
 
178
/* Returns basic block circuit area */
179
static double bb_size (cuc_bb *bb)
180
{
181
  int i;
182
  double d = 0.;
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  for (i = 0; i < bb->ninsn; i++) {
184
    if (bb->insn[i].opt[2] & OPT_CONST)
185
      d = d + timing_table[bb->insn[i].index].sizei;
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    else d = d + timing_table[bb->insn[i].index].size;
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  }
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  return d;
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}
190
 
191
/* Recalculates bb[].cnt values, based on generated profile file */
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void recalc_cnts (cuc_func *f, char *bb_filename)
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{
194
  int i, r, b, prevbb = -1, prevcnt = 0;
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  int buf[256];
196
  const int bufsize = 256;
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  FILE *fi = fopen (bb_filename, "rb");
198
 
199
  assert (fi);
200
 
201
  /* initialize counts */
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  for (b = 0; b < f->num_bb; b++) f->bb[b].cnt = 0;
203
 
204
  /* read control flow from file and set counts */
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  do {
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    r = fread (buf, sizeof (int), bufsize, fi);
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    for (i = 0; i < r; i++) {
208
      b = f->init_bb_reloc[buf[i]];
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      if (b < 0) continue;
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      /* Were we in the loop? */
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      if (b == prevbb) {
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        prevcnt++;
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      } else {
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        /* End the block */
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        if (prevbb >= 0 && prevbb != BBID_START)
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          f->bb[prevbb].cnt += prevcnt / f->bb[prevbb].unrolled + 1;
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        prevcnt = 0;
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        prevbb = b;
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      }
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    }
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  } while (r == bufsize);
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223
  fclose (fi);
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}
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/* Analizes current version of design and places results into timings structure */
227
void analyse_timings (cuc_func *f, cuc_timings *timings)
228
{
229
  long new_time = 0;
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  double size = 0.;
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  int b, i;
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233
  /* Add time needed for mtspr/mfspr */
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  for (i = 0; i < MAX_REGS; i++) if (f->used_regs[i]) new_time++;
235
  new_time++; /* always one mfspr at the end */
236
  new_time *= f->num_runs;
237
 
238
  max_bb_delay = 0.;
239
  for (b = 0; b < f->num_bb; b++) {
240
    new_time += new_bb_cycles (f, b, 0) * f->bb[b].cnt;
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    size = size + bb_size (&f->bb[b]);
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  }
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  timings->new_time = new_time;
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  timings->size = size;
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  log ("Max circuit delay %.2fns; max circuit clock speed %.1fMHz\n",
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                  max_bb_delay, 1000. / max_bb_delay);
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}
248
 
249
/* Loads in the specified timings table */
250
void load_timing_table (char *filename)
251
{
252
  int i;
253
  FILE *fi;
254
 
255
  log ("Loading timings from %s\n", filename);
256
  log ("Using clock delay %.2fns (frequency %.0fMHz)\n", runtime.cuc.cycle_duration,
257
                 1000. / runtime.cuc.cycle_duration);
258
  assert (fi = fopen (filename, "rt"));
259
 
260
  timing_table = (cuc_timing_table *)malloc ((II_LAST + 1) * sizeof (cuc_timing_table));
261
  assert (timing_table);
262
  for (i = 0; i <= II_LAST; i++) {
263
    timing_table[i].size = -1.;
264
    timing_table[i].sizei = -1.;
265
    timing_table[i].delay = -1.;
266
    timing_table[i].delayi = -1.;
267
  }
268
 
269
  while (!feof(fi)) {
270
    char tmp[256];
271 82 jeremybenn
    int index = 0;
272 19 jeremybenn
    if (fscanf (fi, "%s", tmp) != 1) break;
273
    if (tmp[0] == '#') {
274
      while (!feof (fi) && fgetc (fi) != '\n');
275
      continue;
276
    }
277
    for (i = 0; i <= II_LAST; i++)
278
      if (strcmp (known[i].name, tmp) == 0) {
279
        index = i;
280
        break;
281
      }
282
    assert (index <= II_LAST);
283
    i = index;
284
    if (fscanf (fi, "%lf%lf%lf%lf\n", &timing_table[i].size,
285
                &timing_table[i].sizei, &timing_table[i].delay, &timing_table[i].delayi) != 4) break;
286
    /*PRINTF ("!%s size %f,%f delay %f,%f\n", known[i].name, timing_table[i].size,
287
                    timing_table[i].sizei, timing_table[i].delay, timing_table[i].delayi);*/
288
  }
289
 
290
  /* Was everything initialized? */
291
  for (i = 0; i <= II_LAST; i++) {
292
    assert (timing_table[i].size >= 0 && timing_table[i].sizei >= 0
293
     && timing_table[i].delay >= 0 && timing_table[i].delayi >= 0);
294
    /*PRINTF ("%s size %f,%f delay %f,%f\n", known[i], timing_table[i].size,
295
                    timing_table[i].sizei, timing_table[i].delay, timing_table[i].delayi);*/
296
  }
297
 
298
  fclose (fi);
299
}
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