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/* stats.c -- Various statistics about instruction scheduling etc.

   Copyright (C) 1999 Damjan Lampret, lampret@opencores.org

   Copyright (C) 2008 Embecosm Limited

   Contributor Jeremy Bennett <jeremy.bennett@embecosm.com>

   This file is part of Or1ksim, the OpenRISC 1000 Architectural Simulator.

   This program is free software; you can redistribute it and/or modify it

   under the terms of the GNU General Public License as published by the Free

   Software Foundation; either version 3 of the License, or (at your option)

   any later version.

   This program is distributed in the hope that it will be useful, but WITHOUT

   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for

   more details.

   You should have received a copy of the GNU General Public License along

   with this program.  If not, see <http://www.gnu.org/licenses/>.  */

/* This program is commented throughout in a fashion suitable for processing

   with Doxygen. */

/* Autoconf and/or portability configuration */

#include "config.h"

#include "port.h"

/* Package includes */

#include "stats.h"

#include "sim-config.h"

#include "icache-model.h"

#include "spr-defs.h"

#include "execute.h"

#define DSTATS_LEN      3000

#define SSTATS_LEN      300

#define FSTATS_LEN      200

/* Used by safe division - increment divisor by one if it is zero */

#define SD(X) (X != 0 ? X : 1)

struct branchstat

{

  int taken;

  int nottaken;

  int forward;

  int backward;

};

/*! @see also enum insn_type in abstract.h */

static const char func_unit_str[30][30] = {

  "unknown",

  "exception",

  "arith",

  "shift",

  "compare",

  "branch",

  "jump",

  "load",

  "store",

  "movimm",

  "move",

  "extend",

  "nop",

  "mac"

};

struct dstats_entry

{

  int insn1;

  int insn2;

  int cnt_dynamic;

  int depend;

};                              /*!< double stats */

struct sstats_entry

{

  int insn;

  int cnt_dynamic;

};                              /*!< single stats */

struct fstats_entry

{

  enum insn_type insn1;

  enum insn_type insn2;

  int cnt_dynamic;

  int depend;

};                              /*!< functional units stats */

/* Globally visible statistics data. Renamed mstats to or1k_mstats because Mac

   OS X has a lib function called mstats */

struct mstats_entry      or1k_mstats = { 0 };    /*!< misc units stats */

struct cachestats_entry  ic_stats    = { 0 };    /*!< instruction cache stats */

struct cachestats_entry  dc_stats    = { 0 };    /*!< data cache stats */

struct immustats_entry   immu_stats  = { 0 };    /*!< insn MMU stats */

struct dmmustats_entry   dmmu_stats  = { 0 };    /*!< data MMU stats */

struct raw_stats         raw_stats;             /*!< RAW hazard stats */

/* Statistics data strutures used just here */

static struct dstats_entry  dstats[DSTATS_LEN]; /*!< dependency stats */

static struct sstats_entry  sstats[SSTATS_LEN]; /*!< single stats */

static struct fstats_entry  fstats[FSTATS_LEN]; /*!< func units stats */

void

addsstats (int item, int cnt_dynamic)

{

  int i = 0;

  while (sstats[i].insn != item && sstats[i].insn >= 0 && i < SSTATS_LEN)

    i++;

  if (i >= SSTATS_LEN - 1)

    return;

  if (sstats[i].insn >= 0)

    {

      sstats[i].cnt_dynamic += cnt_dynamic;

    }

  else

    {

      sstats[i].insn = item;

      sstats[i].cnt_dynamic = cnt_dynamic;

    }

}

void

adddstats (int item1, int item2, int cnt_dynamic, int depend)

{

  int i = 0;

  while ((dstats[i].insn1 != item1 || dstats[i].insn2 != item2)

         && (i < DSTATS_LEN) && dstats[i].insn1 >= 0)

    i++;

  if (i >= DSTATS_LEN - 1)

    return;

  if (dstats[i].insn1 >= 0)

    {

      dstats[i].cnt_dynamic += cnt_dynamic;

      dstats[i].depend += depend;

    }

  else

    {

      dstats[i].insn1 = item1;

      dstats[i].insn2 = item2;

      dstats[i].cnt_dynamic = cnt_dynamic;

      dstats[i].depend = depend;

    }

}

void

addfstats (enum insn_type item1, enum insn_type item2, int cnt_dynamic,

           int depend)

{

  int i = 0;

  while (((fstats[i].insn1 != item1) || (fstats[i].insn2 != item2)) &&

         (fstats[i].insn1 != it_unknown) && (i < FSTATS_LEN))

    i++;

  if (i >= FSTATS_LEN - 1)

    return;

  if ((fstats[i].insn1 == item1) && (fstats[i].insn2 == item2))

    {

      fstats[i].cnt_dynamic += cnt_dynamic;

      fstats[i].depend += depend;

    }

  else

    {

      fstats[i].insn1 = item1;

      fstats[i].insn2 = item2;

      fstats[i].cnt_dynamic = cnt_dynamic;

      fstats[i].depend = depend;

    }

}

void

initstats ()

{

  int i;

  memset (sstats, 0, sizeof (sstats));

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

    sstats[i].insn = -1;

  memset (dstats, 0, sizeof (dstats));

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

    dstats[i].insn1 = dstats[i].insn2 = -1;

  memset (fstats, 0, sizeof (fstats));

  memset (&or1k_mstats, 0, sizeof (or1k_mstats));

  memset (&ic_stats, 0, sizeof (ic_stats));

  memset (&dc_stats, 0, sizeof (dc_stats));

  memset (&raw_stats, 0, sizeof (raw_stats));

}

static void

printotherstats (int which)

{

  PRINTF ("\n");

  if (config.bpb.enabled)

    {

      struct branchstat bf;

      struct branchstat bnf;

      long bf_all, bnf_all;

      bf.taken = or1k_mstats.bf[1][0] + or1k_mstats.bf[1][1];

      bf.nottaken = or1k_mstats.bf[0][0] + or1k_mstats.bf[0][1];

      bf.forward = or1k_mstats.bf[0][1] + or1k_mstats.bf[1][1];

      bf.backward = or1k_mstats.bf[0][0] + or1k_mstats.bf[1][0];

      bf_all = bf.forward + bf.backward;

      bnf.taken = or1k_mstats.bnf[1][0] + or1k_mstats.bf[1][1];

      bnf.nottaken = or1k_mstats.bnf[0][0] + or1k_mstats.bf[0][1];

      bnf.forward = or1k_mstats.bnf[0][1] + or1k_mstats.bf[1][1];

      bnf.backward = or1k_mstats.bnf[0][0] + or1k_mstats.bf[1][0];

      bnf_all = bnf.forward + bnf.backward;

      PRINTF ("bnf: %d (%ld%%) taken,", bf.taken,

              (bf.taken * 100) / SD (bf_all));

      PRINTF (" %d (%ld%%) not taken,", bf.nottaken,

              (bf.nottaken * 100) / SD (bf_all));

      PRINTF (" %d (%ld%%) forward,", bf.forward,

              (bf.forward * 100) / SD (bf_all));

      PRINTF (" %d (%ld%%) backward\n", bf.backward,

              (bf.backward * 100) / SD (bf_all));

      PRINTF ("bf: %d (%ld%%) taken,", bnf.taken,

              (bnf.taken * 100) / SD (bnf_all));

      PRINTF (" %d (%ld%%) not taken,", bnf.nottaken,

              (bnf.nottaken * 100) / SD (bnf_all));

      PRINTF (" %d (%ld%%) forward,", bnf.forward,

              (bnf.forward * 100) / SD (bnf_all));

      PRINTF (" %d (%ld%%) backward\n", bnf.backward,

              (bnf.backward * 100) / SD (bnf_all));

      PRINTF ("StaticBP bnf(%s): correct %ld%%\n",

              config.bpb.sbp_bnf_fwd ? "forward" : "backward",

              (or1k_mstats.bnf[0][config.bpb.sbp_bnf_fwd] * 100) /

              SD (bnf_all));

      PRINTF ("StaticBP bf(%s): correct %ld%%\n",

              config.bpb.sbp_bf_fwd ? "forward" : "backward",

              (or1k_mstats.bnf[1][config.bpb.sbp_bf_fwd] * 100) /

              SD (bf_all));

      PRINTF ("BPB: hit %d (correct %d%%), miss %d\n", or1k_mstats.bpb.hit,

              (or1k_mstats.bpb.correct * 100) / SD (or1k_mstats.bpb.hit),

              or1k_mstats.bpb.miss);

    }

  else

    PRINTF ("BPB simulation disabled. Enable it to see BPB analysis\n");

  if (config.bpb.btic)

    {

      PRINTF ("BTIC: hit %d(%d%%), miss %d\n", or1k_mstats.btic.hit,

              (or1k_mstats.btic.hit * 100) / SD (or1k_mstats.btic.hit +

                                                 or1k_mstats.btic.miss),

              or1k_mstats.btic.miss);

    }

  else

    PRINTF ("BTIC simulation disabled. Enabled it to see BTIC analysis\n");

  if ((NULL != ic_state) && ic_state->enabled)

    {

      PRINTF ("IC read:  hit %d(%d%%), miss %d\n", ic_stats.readhit,

              (ic_stats.readhit * 100) / SD (ic_stats.readhit +

                                             ic_stats.readmiss),

              ic_stats.readmiss);

    }

  else

    PRINTF ("No ICache. Enable it to see IC results.\n");

  if (config.dc.enabled)

    {

      PRINTF ("DC read:  hit %d(%d%%), miss %d\n", dc_stats.readhit,

              (dc_stats.readhit * 100) / SD (dc_stats.readhit +

                                             dc_stats.readmiss),

              dc_stats.readmiss);

      PRINTF ("DC write: hit %d(%d%%), miss %d\n", dc_stats.writehit,

              (dc_stats.writehit * 100) / SD (dc_stats.writehit +

                                              dc_stats.writemiss),

              dc_stats.writemiss);

    }

  else

    PRINTF ("No DCache. Enable it to see DC results.\n");

  if (cpu_state.sprs[SPR_UPR] & SPR_UPR_IMP)

    {

      PRINTF ("IMMU read:  hit %d(%d%%), miss %d\n", immu_stats.fetch_tlbhit,

              (immu_stats.fetch_tlbhit * 100) / SD (immu_stats.fetch_tlbhit +

                                                    immu_stats.fetch_tlbmiss),

              immu_stats.fetch_tlbmiss);

    }

  else

    PRINTF ("No IMMU. Set UPR[IMP]\n");

  if (cpu_state.sprs[SPR_UPR] & SPR_UPR_DMP)

    {

      PRINTF ("DMMU read:  hit %d(%d%%), miss %d\n", dmmu_stats.loads_tlbhit,

              (dmmu_stats.loads_tlbhit * 100) / SD (dmmu_stats.loads_tlbhit +

                                                    dmmu_stats.loads_tlbmiss),

              dmmu_stats.loads_tlbmiss);

    }

  else

    PRINTF ("No DMMU. Set UPR[DMP]\n");

  PRINTF ("Additional LOAD CYCLES: %u  STORE CYCLES: %u\n",

          runtime.sim.loadcycles, runtime.sim.storecycles);

}

void

printstats (int which)

{

  int i, all = 0, dependall = 0;

  if (which > 1 && which <= 5 && !config.cpu.dependstats)

    {

      PRINTF

        ("Hazard analysis disabled. Enable it to see analysis results.\n");

      return;

    }

  switch (which)

    {

    case 1:

      PRINTF ("stats 1: Misc stats\n");

      printotherstats (which);

      break;

    case 2:

      PRINTF ("stats 2: Instruction usage\n");

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

        all += sstats[i].cnt_dynamic;

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

        if (sstats[i].cnt_dynamic)

          PRINTF ("  %-15s used %6dx (%5.1f%%)\n", insn_name (sstats[i].insn),

                  sstats[i].cnt_dynamic,

                  (sstats[i].cnt_dynamic * 100.) / SD (all));

      PRINTF ("%d instructions (dynamic, single stats)\n", all);

      break;

    case 3:

      PRINTF ("stats 3: Instruction dependencies\n");

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

        {

          all += dstats[i].cnt_dynamic;

          dependall += dstats[i].depend;

        }

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

        if (dstats[i].cnt_dynamic)

          {

            char temp[100];

            sprintf (temp, "%s, %s ", insn_name (dstats[i].insn1),

                     insn_name (dstats[i].insn2));

            PRINTF ("  %-30s %6dx (%5.1f%%)", temp, dstats[i].cnt_dynamic,

                    (dstats[i].cnt_dynamic * 100.) / SD (all));

            PRINTF ("   depend: %5.1f%%\n",

                    (dstats[i].depend * 100.) / dstats[i].cnt_dynamic);

          }

      PRINTF ("%d instructions (dynamic, dependency stats)  depend: %d%%\n",

              all, (dependall * 100) / SD (all));

      break;

    case 4:

      PRINTF ("stats 4: Functional units dependencies\n");

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

        {

          all += fstats[i].cnt_dynamic;

          dependall += fstats[i].depend;

        }

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

        if (fstats[i].cnt_dynamic)

          {

            char temp[100];

            sprintf (temp, "%s, %s", func_unit_str[fstats[i].insn1],

                     func_unit_str[fstats[i].insn2]);

            PRINTF ("  %-30s %6dx (%5.1f%%)", temp, fstats[i].cnt_dynamic,

                    (fstats[i].cnt_dynamic * 100.) / SD (all));

            PRINTF ("   depend: %5.1f%%\n",

                    (fstats[i].depend * 100.) / fstats[i].cnt_dynamic);

          }

      PRINTF

        ("%d instructions (dynamic, functional units stats)  depend: %d%%\n\n",

         all, (dependall * 100) / SD (all));

      break;

    case 5:

      PRINTF ("stats 5: Raw register usage over time\n");

#if RAW_RANGE_STATS

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

        PRINTF ("  Register set and reused in %d. cycle: %d cases\n", i,

                raw_stats.range[i]);

#endif

      break;

    case 6:

      if (config.cpu.sbuf_len)

        {

          extern int sbuf_total_cyc, sbuf_wait_cyc;

          PRINTF ("stats 6: Store buffer analysis\n");

          PRINTF ("Using store buffer of length %i.\n", config.cpu.sbuf_len);

          PRINTF ("Number of total memory store cycles: %i/%lli\n",

                  sbuf_total_cyc,

                  runtime.sim.cycles + sbuf_total_cyc - sbuf_wait_cyc);

          PRINTF ("Number of cycles waiting for memory stores: %i\n",

                  sbuf_wait_cyc);

          PRINTF ("Number of memory cycles spared: %i\n",

                  sbuf_total_cyc - sbuf_wait_cyc);

          PRINTF ("Store speedup %3.2f%%, total speedup %3.2f%%\n",

                  100. * (sbuf_total_cyc - sbuf_wait_cyc) / sbuf_total_cyc,

                  100. * (sbuf_total_cyc -

                          sbuf_wait_cyc) / (runtime.sim.cycles +

                                            sbuf_total_cyc - sbuf_wait_cyc));

        }

      else

        PRINTF

          ("Store buffer analysis disabled. Enable it to see analysis results.\n");

      break;

    default:

      PRINTF ("Please specify a stats group (1-6).\n");

      break;

    }

}