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/* cuc.c -- OpenRISC Custom Unit Compiler

 *    Copyright (C) 2002 Marko Mlinar, markom@opencores.org

 *

 *    This file is part of 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 2 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, write to the Free Software

 *    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */

/* Main file, including code optimization and command prompt */

#include <stdio.h>

#include <stdlib.h>

#include <stdarg.h>

#include <assert.h>

#include <ctype.h>

#include <string.h>

#include <unistd.h>

#include "config.h"

#ifdef HAVE_INTTYPES_H

#include <inttypes.h>

#endif

#include "port.h"

#include "arch.h"

#include "abstract.h"

#include "sim-config.h"

#include "cuc.h"

#include "insn.h"

#include "profiler.h"

#include "opcode/or32.h"

#include "parse.h"

#include "debug.h"

FILE *flog;

int cuc_debug = 0;

/* Last used registers by software convention */

/* Note that r11 is caller saved register, and we can destroy it.

   Due to CUC architecture we must always return something, even garbage (so that

   caller knows, we are finished, when we send acknowledge).

   In case r11 was not used (trivial register assignment) we will remove it later,

   but if we assigned a value to it, it must not be removed, so caller_saved[11] = 0 */

const int caller_saved[MAX_REGS] = {

  0, 0, 0, 1, 1, 1, 1, 1,

  1, 1, 0, 0, 0, 1, 0, 1,

  0, 1, 0, 1, 0, 1, 0, 1,

  0, 1, 0, 1, 0, 1, 0, 1,

  1, 1};

/* returns log2(x) */

/* Call this log2_int, because there is a library function named log2 */

int log2_int (unsigned long x)

{

  int c = 0;

  assert (x >= 0);

  if (!x) return 0; /* not by the book, but practical */

  while (x != 1) x >>= 1, c++;

  return c;

}

/* Does all known instruction optimizations */

void cuc_optimize (cuc_func *func)

{

  int modified = 0;

  int first = 1;

  log ("Optimizing.\n");

  do {

    modified = 0;

    clean_deps (func);

    if (cuc_debug >= 6) print_cuc_bb (func, "AFTER_CLEAN_DEPS");

    if (optimize_cmovs (func)) {

      if (cuc_debug >= 6) print_cuc_bb (func, "AFTER_OPT_CMOVS");

      modified = 1;

    }

    if (cuc_debug) cuc_check (func);

    if (optimize_tree (func)) {

      if (cuc_debug >= 6) print_cuc_bb (func, "AFTER_OPT_TREE1");

      modified = 1;

    }

    if (remove_nops (func)) {

      if (cuc_debug >= 6) print_cuc_bb (func, "NO_NOPS");

      modified = 1;

    }

    if (cuc_debug) cuc_check (func);

    if (remove_dead (func)) {

      if (cuc_debug >= 5) print_cuc_bb (func, "AFTER_DEAD");

      modified = 1;

    }

    if (cuc_debug) cuc_check (func);

    if (cse (func)) {

      log ("Common subexpression elimination.\n");

      if (cuc_debug >= 3) print_cuc_bb (func, "AFTER_CSE");

      modified = 1;

    }

    if (first) {

      insert_conditional_facts (func);

      if (cuc_debug >= 3) print_cuc_bb (func, "AFTER_COND_FACT");

      if (cuc_debug) cuc_check (func);

      first = 0;

    }

    if (optimize_bb (func)) {

      if (cuc_debug >= 5) print_cuc_bb (func, "AFTER_OPT_BB");

      modified = 1;

    }

    if (cuc_debug) cuc_check (func);

    if (remove_nops (func)) {

      if (cuc_debug >= 6) print_cuc_bb (func, "NO_NOPS");

      modified = 1;

    }

    if (remove_dead_bb (func)) {

      if (cuc_debug >= 5) print_cuc_bb (func, "AFTER_DEAD_BB");

      modified = 1;

    }

    if (remove_trivial_regs (func)) {

      if (cuc_debug >= 2) print_cuc_bb (func, "AFTER_TRIVIAL");

      modified = 1;

    }

    if (remove_nops (func)) {

      if (cuc_debug >= 6) print_cuc_bb (func, "NO_NOPS");

      modified = 1;

    }

    add_memory_dep (func, func->memory_order);

    if (cuc_debug >= 7) print_cuc_bb (func, "AFTER_MEMORY_DEP");

    add_data_dep (func);

    if (cuc_debug >= 8) print_cuc_bb (func, "AFTER_DATA_DEP");

    if (schedule_memory (func, func->memory_order)) {

      if (cuc_debug >= 7) print_cuc_bb (func, "AFTER_SCHEDULE_MEM");

      modified = 1;

    }

  } while (modified);

  set_io (func);

#if 0

  detect_max_values (func);

  if (cuc_debug >= 5) print_cuc_bb (func, "AFTER_MAX_VALUES");

#endif

}

/* Pre/unrolls basic block and optimizes it */

cuc_timings *preunroll_bb (char *bb_filename, cuc_func *f, cuc_timings *timings, int b, int i, int j)

{

  cuc_func *func;

  cucdebug (2, "BB%i unroll %i times preroll %i times\n", b, j, i);

  log ("BB%i unroll %i times preroll %i times\n", b, j, i);

  func = preunroll_loop (f, b, i, j, bb_filename);

  if (cuc_debug >= 2) print_cuc_bb (func, "AFTER_PREUNROLL");

  cuc_optimize (func);

  analyse_timings (func, timings);

  cucdebug (2, "new_time = %i, old_time = %i, size = %f\n",

           timings->new_time, func->orig_time, timings->size);

  log ("new time = %icyc, old_time = %icyc, size = %.0f gates\n",

         timings->new_time, func->orig_time, timings->size);

  //output_verilog (func, argv[1]);

  free_func (func);

  timings->b = b;

  timings->unroll = j;

  timings->preroll = i;

  timings->nshared = 0;

  return timings;

}

/* Simple comparison function */

int tim_comp (cuc_timings *a, cuc_timings *b)

{

  if (a->new_time < b->new_time) return -1;

  else if (a->new_time > b->new_time) return 1;

  else return 0;

}

/* Analyses function; done when cuc command is entered in (sim) prompt */

cuc_func *analyse_function (char *module_name, long orig_time,

                unsigned long start_addr, unsigned long end_addr,

                int memory_order, int num_runs)

{

  cuc_timings timings;

  cuc_func *func = (cuc_func *) malloc (sizeof (cuc_func));

  cuc_func *saved;

  int b, i, j;

  char tmp1[256];

  char tmp2[256];

  func->orig_time = orig_time;

  func->start_addr = start_addr;

  func->end_addr = end_addr;

  func->memory_order = memory_order;

  func->nfdeps = 0;

  func->fdeps = NULL;

  func->num_runs = num_runs;

  sprintf (tmp1, "%s.bin", module_name);

  cucdebug (2, "Loading %s.bin\n", module_name);

  if (cuc_load (tmp1)) {

    free (func);

    return NULL;

  }

  log ("Detecting basic blocks\n");

  detect_bb (func);

  if (cuc_debug >= 2) print_cuc_insns ("WITH_BB_LIMITS", 0);

  //sprintf (tmp1, "%s.bin.mp", module_name);

  sprintf (tmp2, "%s.bin.bb", module_name);

  generate_bb_seq (func, config.sim.mprof_fn, tmp2);

  log ("Assuming %i clk cycle load (%i cyc burst)\n", runtime.cuc.mdelay[0], runtime.cuc.mdelay[2]);

  log ("Assuming %i clk cycle store (%i cyc burst)\n", runtime.cuc.mdelay[1], runtime.cuc.mdelay[3]);

  build_bb (func);

  if (cuc_debug >= 5) print_cuc_bb (func, "AFTER_BUILD_BB");

  reg_dep (func);

  log ("Detecting dependencies\n");

  if (cuc_debug >= 2) print_cuc_bb (func, "AFTER_REG_DEP");

  cuc_optimize (func);

#if 0

  csm (func);

#endif

  assert (saved = dup_func (func));

  timings.preroll = timings.unroll = 1;

  timings.nshared = 0;

  add_latches (func);

  if (cuc_debug >= 1) print_cuc_bb (func, "AFTER_LATCHES");

  analyse_timings (func, &timings);

  free_func (func);

  log ("Base option: pre%i,un%i,sha%i: %icyc %.1f\n",

        timings.preroll, timings.unroll, timings.nshared, timings.new_time, timings.size);

  saved->timings = timings;

#if 1

  /* detect and unroll simple loops */

  for (b = 0; b < saved->num_bb; b++) {

    cuc_timings t[MAX_UNROLL * MAX_PREROLL];

    cuc_timings *ut;

    cuc_timings *cut = &t[0];

    int nt = 1;

    double csize;

    saved->bb[b].selected_tim = -1;

    /* Is it a loop? */

    if (saved->bb[b].next[0] != b && saved->bb[b].next[1] != b) continue;

    log ("Found loop at BB%x.  Trying to unroll.\n", b);

    t[0] = timings;

    t[0].b = b;

    t[0].preroll = 1;

    t[0].unroll = 1;

    t[0].nshared = 0;

    sprintf (tmp1, "%s.bin.bb", module_name);

    i = 1;

    do {

      cuc_timings *pt;

      cuc_timings *cpt = cut;

      j = 1;

      do {

        pt = cpt;

        cpt = preunroll_bb (tmp1, saved, &t[nt++], b, ++j, i);

      } while (j <= MAX_PREROLL && pt->new_time > cpt->new_time);

      i++;

      ut = cut;

      cut = preunroll_bb (tmp1, saved, &t[nt++], b, 1, i);

    } while (i <= MAX_UNROLL && ut->new_time > cut->new_time);

    /* Sort the timings */

#if 0

    if (cuc_debug >= 3)

    for (i = 0; i < nt; i++) PRINTF ("%i:%i,%i: %icyc\n",

                    t[i].b, t[i].preroll, t[i].unroll, t[i].new_time);

#endif

    qsort (t, nt, sizeof (cuc_timings), (int (*)(const void *, const void *))tim_comp);

    /* Delete timings, that have worst time and bigger size than other */

    j = 1;

    csize = t[0].size;

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

      if (t[i].size < csize) t[j++] = t[i];

    nt = j;

    cucdebug (1, "Available options\n");

    for (i = 0; i < nt; i++) cucdebug (1, "%i:%i,%i: %icyc %.1f\n",

        t[i].b, t[i].preroll, t[i].unroll, t[i].new_time, t[i].size);

    /* Add results from CSM */

    j = nt;

    for (i = 0; i < saved->bb[b].ntim; i++) {

      int i1;

      for (i1 = 0; i1 < nt; i1++) {

        t[j] = t[i1];

        t[j].size += saved->bb[b].tim[i].size - timings.size;

        t[j].new_time += saved->bb[b].tim[i].new_time - timings.new_time;

        t[j].nshared = saved->bb[b].tim[i].nshared;

        t[j].shared = saved->bb[b].tim[i].shared;

        if (++j >= MAX_UNROLL * MAX_PREROLL) goto full;

      }

    }

full:

    nt = j;

    cucdebug (1, "Available options:\n");

    for (i = 0; i < nt; i++) cucdebug (1, "%i:%i,%i: %icyc %.1f\n",

        t[i].b, t[i].preroll, t[i].unroll, t[i].new_time, t[i].size);

    /* Sort again with new timings added */

    qsort (t, nt, sizeof (cuc_timings), (int (*)(const void *, const void *))tim_comp);

    /* Delete timings, that have worst time and bigger size than other */

    j = 1;

    csize = t[0].size;

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

      if (t[i].size < csize) t[j++] = t[i];

    nt = j;

    cucdebug (1, "Available options:\n");

    for (i = 0; i < nt; i++) cucdebug (1, "%i:%i,%i: %icyc %.1f\n",

                               t[i].b, t[i].preroll, t[i].unroll, t[i].new_time, t[i].size);

    if (saved->bb[b].ntim) free (saved->bb[b].tim);

    saved->bb[b].ntim = nt;

    assert (saved->bb[b].tim = (cuc_timings *) malloc (sizeof (cuc_timings) * nt));

    /* Copy options in reverse order -- smallest first */

    for (i = 0; i < nt; i++) saved->bb[b].tim[i] = t[nt - 1 - i];

    log ("Available options:\n");

    for (i = 0; i < saved->bb[b].ntim; i++) {

      log ("%i:pre%i,un%i,sha%i: %icyc %.1f\n",

        saved->bb[b].tim[i].b, saved->bb[b].tim[i].preroll, saved->bb[b].tim[i].unroll,

        saved->bb[b].tim[i].nshared, saved->bb[b].tim[i].new_time, saved->bb[b].tim[i].size);

    }

  }

#endif

  return saved;

}

/* Utility option formatting functions */

static const char *option_char = "?abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

/*static */char *gen_option (char *s, int bb_no, int f_opt)

{

  if (bb_no >= 0) sprintf (s, "%i", bb_no);

  assert (f_opt <= strlen (option_char));

  sprintf (s, "%s%c", s, option_char[f_opt]);

  return s;

}

/*static */void print_option (int bb_no, int f_opt)

{

  char tmp1[10];

  char tmp2[10];

  sprintf (tmp2, "%s", gen_option (tmp1, bb_no, f_opt));

  PRINTF ("%3s", tmp2);

}

static char *format_func_options (char *s, cuc_func *f)

{

  int b, first = 1;

  *s = '\0';

  for (b = 0; b < f->num_bb; b++)

    if (f->bb[b].selected_tim >= 0) {

      char tmp[10];

      sprintf (s, "%s%s%s", s, first ? "" : ",", gen_option (tmp, b, f->bb[b].selected_tim));

      first = 0;

    }

  return s;

}

static void options_cmd (int func_no, cuc_func *f)

{

  int b, i;

  char tmp[30];

  char *name = prof_func[func_no].name;

  PRINTF ("-----------------------------------------------------------------------------\n");

  PRINTF ("|%-28s|pre/unrolled|shared|  time  |  gates |old_time|\n",

            strstrip (tmp, name, 28));

  PRINTF ("|                    BASE    |%4i / %4i | %4i |%8i|%8.f|%8i|\n", 1, 1, 0,

          f->timings.new_time, f->timings.size, f->orig_time);

  for (b = 0; b < f->num_bb; b++) {

    /* Print out results */

    for (i = 1; i < f->bb[b].ntim; i++) { /* First one is base option */

      int time = f->bb[b].tim[i].new_time - f->timings.new_time;

      double size = f->bb[b].tim[i].size - f->timings.size;

      PRINTF ("|                   ");

      print_option (b, i);

      PRINTF ("      |%4i / %4i | %4i |%+8i|%+8.f|        |\n",

        f->bb[b].tim[i].preroll, f->bb[b].tim[i].unroll, f->bb[b].tim[i].nshared,

        time, size);

    }

  }

}

/* Generates a function, based on specified parameters */

cuc_func *generate_function (cuc_func *rf, char *name, char *cut_filename)

{

  int b;

  char tmp[256];

  cuc_timings tt;

  cuc_func *f;

  assert (f = dup_func (rf));

  if (cuc_debug >= 2) print_cuc_bb (f, "BEFORE_GENERATE");

  log ("Generating function %s.\n", name);

  PRINTF ("Generating function %s.\n", name);

  format_func_options (tmp, rf);

  if (strlen (tmp)) PRINTF ("Applying options: %s\n", tmp);

  else PRINTF ("Using basic options.\n");

  /* Generate function as specified by options */

  for (b = 0; b < f->num_bb; b++) {

    cuc_timings *st;

    if (rf->bb[b].selected_tim < 0) continue;

    st = &rf->bb[b].tim[rf->bb[b].selected_tim];

    sprintf (tmp, "%s.bin.bb", name);

    preunroll_bb (&tmp[0], f, &tt, b, st->preroll, st->unroll);

    if (cuc_debug >= 1) print_cuc_bb (f, "AFTER_PREUNROLL");

  }

  for (b = 0; b < f->num_bb; b++) {

    cuc_timings *st;

    if (rf->bb[b].selected_tim < 0) continue;

    st = &rf->bb[b].tim[rf->bb[b].selected_tim];

    if (!st->nshared) continue;

    assert (0);

    //csm_gen (f, rf, st->nshared, st->shared);

  }

  add_latches (f);

  if (cuc_debug >= 1) print_cuc_bb (f, "AFTER_LATCHES");

  analyse_timings (f, &tt);

  sprintf (tmp, "%s%s", cut_filename, name);

  output_verilog (f, tmp, name);

  return f;

}

/* Calculates required time, based on selected options */

int calc_cycles (cuc_func *f)

{

  int b, ntime = f->timings.new_time;

  for (b = 0; b < f->num_bb; b++)

    if (f->bb[b].selected_tim >= 0) {

      assert (f->bb[b].selected_tim < f->bb[b].ntim);

      ntime += f->bb[b].tim[f->bb[b].selected_tim].new_time - f->timings.new_time;

    }

  return ntime;

}

/* Calculates required size, based on selected options */

double calc_size (cuc_func *f)

{

  int b;

  double size = f->timings.size;

  for (b = 0; b < f->num_bb; b++)

    if (f->bb[b].selected_tim >= 0) {

      assert (f->bb[b].selected_tim < f->bb[b].ntim);

      size += f->bb[b].tim[f->bb[b].selected_tim].size - f->timings.size;

    }

  return size;

}

/* Dumps specified function to file (hex) */

unsigned long extract_function (char *out_fn, unsigned long start_addr)

{

  FILE *fo;

  unsigned long a = start_addr;

  int x = 0;

  assert (fo = fopen (out_fn, "wt+"));

  do {

    int breakpoint;

    unsigned long d = eval_direct32 (a, &breakpoint, 0, 0);

    int index = insn_decode (d);

    assert (index >= 0);

    if (x) x++;

    if (strcmp (insn_name (index), "l.jr") == 0) x = 1;

    a += 4;

    fprintf (fo, "%08lx\n", d);

  } while (x < 2);

  fclose (fo);

  return a - 4;

}

static cuc_func *func[MAX_FUNCS];

static int func_v[MAX_FUNCS];

/* Detects function dependencies and removes  */

static void set_func_deps ()

{

  int f, b, i, j;

restart:

  for (f = 0; f < prof_nfuncs - 1; f++) if (func[f]) {

    int fused[MAX_FUNCS] = {0};

    int c;

    for (b = 0; b < func[f]->num_bb; b++)

      for (i = 0; i < func[f]->bb[b].ninsn; i++) {

        cuc_insn *ii = &func[f]->bb[b].insn[i];

        if (ii->index == II_CALL) {

          assert (ii->opt[0] == OPT_CONST);

          for (j = 0; j < prof_nfuncs - 1; j++)

            if (func[j] && func[j]->start_addr == ii->op[0]) break;

          if (j >= prof_nfuncs - 1) {

            log ("%s is calling unknown function, address %08lx\n",

                            prof_func[f].name, ii->op[0]);

            debug (1, "%s is calling unknown function, address %08lx\n",

                            prof_func[f].name, ii->op[0]);

            free_func (func[f]);

            func[f] = NULL;

            goto restart;

          } else if (f == j) {

            log ("%s is recursive, ignoring\n", prof_func[f].name);

            debug (1, "%s is recursive, ignoring\n", prof_func[f].name);

            free_func (func[f]);

            func[f] = NULL;

            goto restart;

          } else fused[j]++;

        }

      }

    for (i = 0; i < MAX_FUNCS; i++) if (fused[i]) c++;

    if (func[f]->nfdeps) free (func[f]->fdeps);

    func[f]->nfdeps = c;

    func[f]->fdeps = (cuc_func **) malloc (sizeof (cuc_func *) * c);

    for (i = 0, j = 0; i < MAX_FUNCS; i++)

      if (fused[i]) func[f]->fdeps[j++] = func[i];

  }

  /* Detect loops */

  {

    int change;

    for (f = 0; f < MAX_FUNCS; f++) if (func[f]) func[f]->tmp = 0;

    do {

      change = 0;

      for (f = 0; f < MAX_FUNCS; f++) if (func[f] && !func[f]->tmp) {