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/* verilog.c -- OpenRISC Custom Unit Compiler, verilog generator
 *    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. */
 
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <assert.h>
 
#include "config.h"
 
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#endif
 
#include "port.h"
#include "arch.h"
#include "abstract.h"
#include "cuc.h"
#include "insn.h"
#include "profiler.h"
#include "sim-config.h"
 
/* Shortcut */
#define GEN(x...) fprintf (fo, x)
 
/* Find index of load/store/call */
int find_lsc_index (cuc_func *f, int ref)
{
  int c = 0;
  int i;
  int load;
 
  if (f->INSN(ref).index == II_CALL) {
    for (i = 0; i < f->nmsched; i++) {
      if (f->msched[i] == ref) break;
      if (f->mtype[i] & MT_CALL) c++;
    }
  } else {
    load = II_IS_LOAD (f->INSN(ref).index);
    for (i = 0; i < f->nmsched; i++) {
      if (f->msched[i] == ref) break;
      if (load && (f->mtype[i] & MT_LOAD)
       || !load && (f->mtype[i] & MT_STORE)) c++;
    }
  }
  return c;
}
 
/* Print out dependencies as verilog expression */
void print_deps (FILE *fo, cuc_func *f, int b, dep_list *t, int registered)
{
  if (t) {
    int first = 0;
    while (t) {
      if (f->INSN(t->ref).type & IT_MEMORY) {
        GEN ("%s%c_end[%i]", first ? " && " : "",
                  II_IS_LOAD (f->INSN(t->ref).index) ? 'l' : 's', find_lsc_index (f, t->ref));
      } else if (f->INSN(t->ref).index == II_CALL) {
        GEN ("%sf_end[%i]", first ? " && " : "", find_lsc_index (f, t->ref));
      } else {
        PRINTF ("print_deps: err %lx\n", t->ref);
        assert (0);
      }
      first = 1;
      t = t->next;
    }
  } else {
    if (registered) GEN ("bb_start_r[%i]", b);
    else GEN ("bb_start[%i]", b);
  }
}
 
char *print_op_v (cuc_func *f, char *s, int ref, int j)
{
  unsigned long op = f->INSN(ref).op[j];
  unsigned long opt = f->INSN(ref).opt[j];
  switch (opt & ~OPT_DEST) {
    case OPT_NONE: assert (0); break;
    case OPT_CONST: if (f->INSN(ref).type & IT_COND && (f->INSN(ref).index == II_CMOV
                     || f->INSN(ref).index == II_ADD)) {
                      assert (op == 0 || op == 1);
                      sprintf (s, "1'b%lx", op);
                    } else sprintf (s, "32'h%lx", op);
                    break;
    case OPT_REGISTER:
                    if (opt & OPT_DEST) sprintf (s, "t%x_%x", REF_BB(ref), REF_I(ref));
                    else sprintf (s, "r%li_%c", op, opt & OPT_DEST ? 'o' : 'i');
                    break;
#if 0
    case OPT_FREG:  assert (opt & OPT_DEST);
                    sprintf (s, "fr%i_o", op);
                    break;
#endif
    case OPT_REF:   sprintf (s, "t%lx_%lx", REF_BB(op), REF_I(op)); break;
  }
  return s;
}
 
/* Prints out specified instruction */
void print_insn_v (FILE *fo, cuc_func *f, int b, int i)
{
  cuc_insn *ii = &f->bb[b].insn[i];
  char *s = known[ii->index].rtl;
  char tmp[200] = "";
 
  assert (s);
  while (*s) {
    if (*s <= MAX_OPERANDS) {
      char t[30];
      sprintf (tmp, "%s%s", tmp, print_op_v (f, t, REF(b, i), *s - 1));
    } else if (*s == '\b') sprintf (tmp, "%s%i", b);
    else sprintf (tmp, "%s%c", tmp, *s);
    s++;
  }
  GEN ("%-40s /* %s */\n", tmp, ii->disasm);
  if (ii->type & IT_MEMORY) {
    int nls = find_lsc_index (f, REF (b, i));
    if (II_IS_LOAD (ii->index)) {
      int nm;
      for (nm = 0; nm < f->nmsched; nm++) if (f->msched[nm] == REF (b, i)) break;
      assert (nm < f->nmsched);
 
      GEN ("  if (l_end[%i]) t%x_%x <= #Tp ", nls, b, i);
      switch (f->mtype[nm] & (MT_WIDTH | MT_SIGNED)) {
        case 1: GEN ("l_dat_i & 32'hff;\n");
                break;
        case 2: GEN ("l_dat_i & 32'hffff;\n");
                break;
        case 4 | MT_SIGNED:
        case 4: GEN ("l_dat_i;\n");
                break;
        case 1 | MT_SIGNED:
                GEN ("{24{l_dat_i[7]}, l_dat_i[7:0]};\n");
                break;
        case 2 | MT_SIGNED:
                GEN ("{16{l_dat_i[15]}, l_dat_i[15:0]};\n");
                break;
        default: assert (0);
      }
    }
  } else if (ii->index == II_LRBB) {
    GEN ("  if (rst) t%x_%x <= #Tp 1'b0;\n", b, i);
    assert (f->bb[b].prev[0] >= 0);
    if (f->bb[b].prev[0] == BBID_START)
      GEN ("  else if (bb_start[%i]) t%x_%x <= #Tp start_i;\n", b, b, i);
    else
      GEN ("  else if (bb_start[%i]) t%x_%x <= #Tp bb_stb[%i];\n", b, b, i, f->bb[b].prev[0]);
  } else if (ii->index == II_REG) {
    assert (ii->opt[1] == OPT_REF);
    GEN ("  if (");
    if (f->bb[b].mdep) print_deps (fo, f, b, f->bb[b].mdep, 0);
    else GEN ("bb_stb[%i]", b);
    GEN (") t%x_%x <= #Tp t%lx_%lx;\n",  b, i,
                    REF_BB (ii->op[1]), REF_I (ii->op[1]));
  }
}
 
/* Outputs binary number */
static char *bin_str (unsigned long x, int len)
{
  static char bx[33];
  char *s = bx;
  while (len > 0) *s++ = '0' + ((x >> --len) & 1);
  *s = '\0';
  return bx;
}
 
/* Returns index of branch instruction inside a block b */
static int branch_index (cuc_bb *bb)
{
  int i;
  for (i = bb->ninsn - 1; i >= 0; i--)
    if (bb->insn[i].type & IT_BRANCH) return i;
  return -1;
}
 
static void print_turn_off_dep (FILE *fo, cuc_func *f, dep_list *dep)
{
  while (dep) {
    assert (f->INSN(dep->ref).type & IT_MEMORY || f->INSN(dep->ref).index == II_CALL);
    GEN ("      %c_stb[%i] <= #Tp 1'b0;\n", f->INSN(dep->ref).index == II_CALL ? 'f'
            : II_IS_LOAD (f->INSN(dep->ref).index) ? 'l' : 's', find_lsc_index (f, dep->ref));
    dep = dep->next;
  }
}
 
static int func_index (cuc_func *f, int ref)
{
  int i;
  unsigned long addr;
  assert (f->INSN(ref).index == II_CALL && f->INSN(ref).opt[0] & OPT_CONST);
  addr = f->INSN(ref).op[0];
  for (i = 0; i < f->nfdeps; i++)
    if (f->fdeps[i]->start_addr == addr) return i;
 
  assert (0);
  return -1;
}
 
/* Generates verilog file out of insn dataflow */
void output_verilog (cuc_func *f, char *filename, char *funcname)
{
  FILE *fo;
  int b, i, j;
  int ci = 0, co = 0;
  int nloads = 0, nstores = 0, ncalls = 0;
  char tmp[256];
  sprintf (tmp, "%s.v", filename);
 
  log ("Generating verilog file \"%s\"\n", tmp);
  PRINTF ("Generating verilog file \"%s\"\n", tmp);
  if ((fo = fopen (tmp, "wt+")) == NULL) {
    fprintf (stderr, "Cannot open '%s'\n", tmp);
    exit (1);
  }
 
  /* output header */
  GEN ("/* %s -- generated by Custom Unit Compiler\n", tmp);
  GEN ("   (C) 2002 Opencores\n"); 
  GEN ("   function   \"%s\"\n", funcname);
  GEN ("   at         %08lx - %08lx\n", f->start_addr, f->end_addr);
  GEN ("   num BBs    %i */\n\n", f->num_bb);
 
  GEN ("`include \"timescale.v\"\n\n");
  GEN ("module %s (clk, rst,\n", filename);
  GEN ("              l_adr_o, l_dat_i, l_req_o,\n");
  GEN ("              l_sel_o, l_linbrst_o, l_rdy_i,\n");
  GEN ("              s_adr_o, s_dat_o, s_req_o,\n");
  GEN ("              s_sel_o, s_linbrst_o, s_rdy_i,\n");
 
  GEN ("/* inputs */  ");
  for (i = 0; i < MAX_REGS; i++)
    if (f->used_regs[i]) {
      GEN ("r%i_i, ", i);
      ci++;
    }
  if (!ci) GEN ("/* NONE */");
 
  GEN ("\n/* outputs */ ");
  for (i = 0; i < MAX_REGS; i++)
    if (f->lur[i] >= 0 && !f->saved_regs[i]) {
      GEN ("r%i_o, ", i);
      co++;
    }
 
  if (!co) GEN ("/* NONE */");
  if (f->nfdeps) {
    GEN ("\n/* f. calls */, fstart_o, %sfend_i, fr11_i, ",
                    log2_int (f->nfdeps) > 0 ? "fid_o, " : "");
    for (i = 0; i < 6; i++) GEN ("fr%i_o, ", i + 3);
  }
  GEN ("\n              start_i, end_o, busy_o);\n\n");
 
  GEN ("parameter Tp = 1;\n\n");
 
  GEN ("input         clk, rst;\n");
  GEN ("input         start_i;\t/* Module starts when set to 1 */ \n");
  GEN ("output        end_o;\t/* Set when module finishes, cleared upon start_i == 1 */\n");
  GEN ("output        busy_o;\t/* Set when module should not be interrupted */\n");
  GEN ("\n/* Bus signals */\n");
  GEN ("output        l_req_o, s_req_o;\n");
  GEN ("input         l_rdy_i, s_rdy_i;\n");
  GEN ("output  [3:0] l_sel_o, s_sel_o;\n");
  GEN ("output [31:0] l_adr_o, s_adr_o;\n");
  GEN ("output        l_linbrst_o, s_linbrst_o;\n");
  GEN ("input  [31:0] l_dat_i;\n");
  GEN ("output [31:0] s_dat_o;\n\n");
 
  GEN ("reg           l_req_o, s_req_o;\n");
  GEN ("reg    [31:0] l_adr_o, s_adr_o;\n");
  GEN ("reg     [3:0] l_sel_o, s_sel_o;\n");
  GEN ("reg    [31:0] s_dat_o;\n");
  GEN ("reg           l_linbrst_o, s_linbrst_o;\n");
 
  if (ci || co) GEN ("\n/* module ports */\n");
  if (ci) {
    int first = 1;
    GEN ("input  [31:0]");
    for (i = 0; i < MAX_REGS; i++)
      if (f->used_regs[i]) {
        GEN ("%sr%i_i", first ? " " : ", ", i);
        first = 0;
      }
    GEN (";\n");
  }
 
  if (co) {
    int first = 1;
    GEN ("output [31:0]");
    for (i = 0; i < MAX_REGS; i++)
      if (f->lur[i] >= 0 && !f->saved_regs[i]) {
        GEN ("%sr%i_o", first ? " " : ", ", i);
        first = 0;
      }
    GEN (";\n");
  }
 
  if (f->nfdeps) {
    GEN ("\n/* Function calls */\n");
    GEN ("output [31:0] fr3_o");
    for (i = 1; i < 6; i++) GEN (", fr%i_o", i + 3);
    GEN (";\n");
    GEN ("input  [31:0] fr11_i;\n");
    if (log2_int(f->nfdeps) > 0) GEN ("output [%i:0] fid_o;\n", log2_int(f->nfdeps));
    GEN ("output        fstart_o;\n");
    GEN ("input         fend_i;\n");
  }
 
  /* Count loads & stores */
  for (i = 0; i < f->nmsched; i++)
    if (f->mtype[i] & MT_STORE) nstores++;
    else if (f->mtype[i] & MT_LOAD) nloads++;
    else if (f->mtype[i] & MT_CALL) ncalls++;
 
  /* Output internal registers for loads */
  if (nloads) {
    int first = 1;
    int num = 0;
    GEN ("\n/* internal registers for loads */\n");
    for (i = 0; i < f->nmsched; i++)
      if (f->mtype[i] & MT_LOAD) {
        GEN ("%st%x_%x", first ? "reg    [31:0] " : ", ",
                REF_BB(f->msched[i]), REF_I(f->msched[i]));
 
        if (num >= 8) {
          GEN (";\n");
          first = 1;
          num = 0;
        } else {
          first = 0;
          num++;
        }
      }
    if (!first) GEN (";\n");
  }
 
  /* Internal register for function return value */
  if (f->nfdeps) {
    GEN ("\n/* Internal register for function return value */\n");
    GEN ("reg     [31:0] fr11_r;\n");
  }
 
  GEN ("\n/* 'zero or one' hot state machines */\n");
  if (nloads) GEN ("reg     [%i:0] l_stb; /* loads */\n", nloads - 1);
  if (nstores) GEN ("reg     [%i:0] s_stb; /* stores */\n", nstores - 1);
  GEN ("reg     [%i:0] bb_stb; /* basic blocks */\n", f->num_bb - 1);
 
  {
    int first = 2;
    int num = 0;
    for (b = 0; b < f->num_bb; b++)
      for (i = 0; i < f->bb[b].ninsn; i++)
        if (f->bb[b].insn[i].type & IT_COND
         && f->bb[b].insn[i].index != II_REG
         && f->bb[b].insn[i].index != II_LRBB) {
          if (first == 2) GEN ("\n/* basic block condition wires */\n");
          GEN ("%st%x_%x", first ? "wire          " : ", ", b, i);
          if (num >= 8) {
            GEN (";\n");
            first = 1;
            num = 0;
          } else {
            first = 0;
            num++;
          }
        }
    if (!first) GEN (";\n");
 
    GEN ("\n/* forward declaration of normal wires */\n");
    num = 0;
    first = 1;
    for (b = 0; b < f->num_bb; b++)
      for (i = 0; i < f->bb[b].ninsn; i++)
        if (!(f->bb[b].insn[i].type & (IT_COND | IT_BRANCH))
         && f->bb[b].insn[i].index != II_REG
         && f->bb[b].insn[i].index != II_LRBB) {
          /* Exclude loads */
          if (f->bb[b].insn[i].type & IT_MEMORY && II_IS_LOAD (f->bb[b].insn[i].index)) continue;
          GEN ("%st%x_%x", first ? "wire   [31:0] " : ", ", b, i);
          if (num >= 8) {
            GEN (";\n");
            first = 1;
            num = 0;
          } else {
            first = 0;
            num++;
          }
        }
    if (!first) GEN (";\n");
 
    GEN ("\n/* forward declaration registers */\n");
    num = 0;
    first = 1;
    for (b = 0; b < f->num_bb; b++)
      for (i = 0; i < f->bb[b].ninsn; i++)
        if (f->bb[b].insn[i].index == II_REG
         && f->bb[b].insn[i].index != II_LRBB) {
          GEN ("%st%x_%x", first ? "reg    [31:0] " : ", ", b, i);
          if (num >= 8) {
            GEN (";\n");
            first = 1;
            num = 0;
          } else {
            first = 0;
            num++;
          }
        }
    if (!first) GEN (";\n");
 
    num = 0;
    first = 1;
    for (b = 0; b < f->num_bb; b++)
      for (i = 0; i < f->bb[b].ninsn; i++)
        if (f->bb[b].insn[i].index != II_REG
         && f->bb[b].insn[i].index == II_LRBB) {
          GEN ("%st%x_%x", first ? "reg           " : ", ", b, i);
          if (num >= 8) {
            GEN (";\n");
            first = 1;
            num = 0;
          } else {
            first = 0;
            num++;
          }
        }
    if (!first) GEN (";\n");
  }
 
  if (nloads || nstores) GEN ("\n/* dependencies */\n");
  if (nloads) GEN ("wire    [%i:0] l_end = l_stb & {%i{l_rdy_i}};\n",
                  nloads - 1, nloads);
  if (nstores) GEN ("wire    [%i:0] s_end = s_stb & {%i{s_rdy_i}};\n",
                  nstores - 1, nstores);
  if (ncalls) GEN ("wire    [%i:0] f_end = f_stb & {%i{fend_i}};\n",
                  ncalls - 1, ncalls);
 
  GEN ("\n/* last dependency */\n");
  GEN ("wire   end_o = ");
  for (b = 0; b < f->num_bb; b++) {
    for (i = 0; i < 2; i++) if (f->bb[b].next[i] == BBID_END) {
      GEN ("bb_stb[%i]", b);
      if (f->bb[b].mdep) {
        GEN (" && ");
        print_deps (fo, f, b, f->bb[b].mdep, 0);
      }
      /* Is branch to BBID_END conditional? */
      if (f->bb[b].next[1 - i] >= 0) {
        int bidx = branch_index (&f->bb[b]);
        char t[30];
        print_op_v (f, t, REF (b, bidx), 1);
        GEN (" && %s%s", i ? "" : "!", t);
      }
    }
  }
  GEN (";\n");
  GEN ("wire   busy_o = |bb_stb;\n");
 
 
  GEN ("\n/* Basic block triggers */\n");
  GEN ("wire   [%2i:0] bb_start = {\n", f->num_bb - 1);
  for (b = f->num_bb - 1; b >= 0; b--) {
    GEN ("    /* bb_start[%2i] */ ", b);
    for (i = 0; i < 2; i++) if (f->bb[b].prev[i] >= 0 && f->bb[b].prev[i] != BBID_START) {
      cuc_bb *prev = &f->bb[f->bb[b].prev[i]];
      int t;
      if (i) GEN ("\n                    || ");
      if (prev->mdep) {
        print_deps (fo, f, f->bb[b].prev[i], prev->mdep, 0);
        GEN (" && ");
      }
      GEN ("bb_stb[%i]", f->bb[b].prev[i]);
      if (prev->next[0] >= 0 && prev->next[0] != BBID_END
       && prev->next[1] >= 0 && prev->next[1] != BBID_END) {
        int bi = REF (f->bb[b].prev[i], branch_index (&f->bb[f->bb[b].prev[i]]));
        int ci;
        assert (bi >= 0);
        ci = f->INSN(bi).op[1];
        t = prev->next[0] == b;
        GEN (" && ");
        if (f->INSN(bi).opt[1] & OPT_REF) {
          GEN ("%st%x_%x", t ? "" : "!", REF_BB(ci), REF_I(ci));
        } else {
          cucdebug (5, "%x!%x!%x\n", bi, ci, f->INSN(bi).opt[1]);
          assert (f->INSN(bi).opt[1] & OPT_CONST);
          GEN ("%s%i", t ? "" : "!", ci);
        }
      }
    } else break;
    if (!i) GEN ("start_i");
    if (b == 0) GEN ("};\n");
    else GEN (",\n");
  }
 
  GEN ("\n/* Register the bb_start */\n");
  GEN ("reg   [%2i:0] bb_start_r;\n\n", f->num_bb - 1);
  GEN ("always @(posedge rst or posedge clk)\n");
  GEN ("begin\n");
  GEN ("  if (rst) bb_start_r <= #Tp %i'b0;\n", f->num_bb);
  GEN ("  else if (end_o) bb_start_r <= #Tp %i'b0;\n", f->num_bb);
  GEN ("  else bb_start_r <= #Tp bb_start;\n");
  GEN ("end\n");
 
  GEN ("\n/* Logic */\n");
  /* output body */
  for (b = 0; b < f->num_bb; b++) {
    GEN ("\t\t/* BB%i */\n", b);
    for (i = 0; i < f->bb[b].ninsn; i++)
      print_insn_v (fo, f, b, i);  
    GEN ("\n");
  }
 
  if (co) {
    GEN ("\n/* Outputs */\n");
    for (i = 0; i < MAX_REGS; i++)
      if (f->lur[i] >= 0 && !f->saved_regs[i])
        GEN ("assign r%i_o = t%x_%x;\n", i, REF_BB(f->lur[i]),
                        REF_I(f->lur[i]));
  }
 
  if (nstores) {
    int cur_store;
    GEN ("\n/* Memory stores */\n");
    GEN ("always @(s_stb");
    for (i = 0; i < f->nmsched; i++)
      if (f->mtype[i] & MT_STORE) {
        char t[30];
        unsigned long opt = f->INSN(f->msched[i]).opt[0];
        if ((opt & ~OPT_DEST) != OPT_CONST) {
          GEN (" or %s", print_op_v (f, t, f->msched[i], 0));
        }
      }
 
    cur_store = 0;
    GEN (")\nbegin\n");
    for (i = 0; i < f->nmsched; i++) if (f->mtype[i] & MT_STORE) {
      char t[30];
      GEN ("  %sif (s_stb[%i]) s_dat_o = %s;\n", cur_store == 0 ? "" : "else ", cur_store,
                      print_op_v (f, t, f->msched[i], 0));
      cur_store++;
      //PRINTF ("msched[%i] = %x (mtype %x) %x\n", i, f->msched[i], f->mtype[i], f->INSN(f->msched[i]).op[0]);
    }
    GEN ("  else s_dat_o = 32'hx;\n");
    GEN ("end\n");
  }
 
  /* Generate load and store state machine */
#if 0
  GEN ("\n/* Load&store state machine */\n");
  GEN ("always @(posedge clk or posedge rst)\n");
  GEN ("  if (rst) begin\n");
  if (nloads) GEN ("    l_stb <= #Tp %i'h0;\n", nloads);
  if (nstores) GEN ("    s_stb <= #Tp %i'h0;\n", nstores);
  GEN ("  end else begin\n");
  for (i = 0; i < f->nmsched; i++) if (f->mtype[i] & MT_LOAD || f->mtype[i] & MT_STORE) {
    int cur = 0;
    dep_list *dep = f->INSN(f->msched[i]).dep;
    assert (f->INSN(f->msched[i]).opt[1] & (OPT_REF | OPT_REGISTER));
    GEN ("    if (");
    print_deps (fo, f, REF_BB(f->msched[i]), f->INSN(f->msched[i]).dep, 1);
    GEN (") begin\n");
    print_turn_off_dep (fo, f, dep);
    GEN ("      %c_stb[%i] <= #Tp 1'b1;\n", f->mtype[i] & MT_LOAD ? 'l' : 's', cur++);
    GEN ("    end\n");
  }
  GEN ("    if (%c_end[%i]) %c_stb <= #Tp %i'h0;\n", c, cur - 1, c, cur);
  GEN ("  end\n");
#endif
 
  /* Generate state generator machine */
  for (j = 0; j < 2; j++) {
    char c;
    char *s;
 
    switch (j) {
      case 0: c = 'l'; s = "Load"; break;
      case 1: c = 's'; s = "Store"; break;
      case 2: c = 'c'; s = "Calls"; break;
    }
    if (j == 0 && nloads
     || j == 1 && nstores
     || j == 2 && ncalls) {
      int cur = 0;
      char t[30];
 
      GEN ("\n/* %s state generator machine */\n", s);
      GEN ("always @(");
      for (i = 0; i < f->nmsched; i++) {
        print_op_v (f, t, f->msched[i], 1);
        GEN ("%s or ", t);
      }
      GEN ("bb_start_r");
      if (nloads) GEN (" or l_end");
      if (nstores) GEN (" or s_end");
      GEN (")\n");
      GEN ("begin\n  ");
      cucdebug (1, "%s\n", s);
      for (i = 0; i < f->nmsched; i++)
        if (j == 0 && f->mtype[i] & MT_LOAD
         || j == 1 && f->mtype[i] & MT_STORE
         || j == 2 && f->mtype[i] & MT_CALL) {
        cucdebug (1, "msched[%i] = %x (mtype %x)\n", i, f->msched[i], f->mtype[i]);
        assert (f->INSN(f->msched[i]).opt[1] & (OPT_REF | OPT_REGISTER));
        GEN ("if (");
        print_deps (fo, f, REF_BB(f->msched[i]), f->INSN(f->msched[i]).dep, 1);
        GEN (") begin\n");
        GEN ("    %c_req_o = 1'b1;\n", c);
        GEN ("    %c_sel_o[3:0] = 4'b", c);
        switch (f->mtype[i] & MT_WIDTH) {
          case 1: GEN ("0001 << (%s & 32'h3);\n",
                                  print_op_v (f, t, f->msched[i], 1)); break;
          case 2: GEN ("0011 << ((%s & 32'h1) << 1);\n",
                                  print_op_v (f, t, f->msched[i], 1)); break;
          case 4: GEN ("1111;\n"); break;
          default: assert (0);
        }
        GEN ("    %c_linbrst_o = 1'b%i;\n", c,
                      (f->mtype[i] & MT_BURST) && !(f->mtype[i] & MT_BURSTE) ? 1 : 0);
        GEN ("    %c_adr_o = t%lx_%lx & ~32'h3;\n", c,
                      REF_BB(f->INSN(f->msched[i]).op[1]), REF_I(f->INSN(f->msched[i]).op[1]));
        GEN ("  end else ");
      }
      GEN ("if (%c_end[%i]) begin\n", c, cur - 1);
      GEN ("    %c_req_o = 1'b0;\n", c);
      GEN ("    %c_sel_o[3:0] = 4'bx;\n", c);
      GEN ("    %c_linbrst_o = 1'b0;\n", c);
      GEN ("    %c_adr_o = 32'hx;\n", c);
      GEN ("  end else begin\n");
      GEN ("    %c_req_o = 1'b0;\n", c);
      GEN ("    %c_sel_o[3:0] = 4'bx;\n", c);
      GEN ("    %c_linbrst_o = 1'b0;\n", c);
      GEN ("    %c_adr_o = 32'hx;\n", c);
      GEN ("  end\n");
      GEN ("end\n");
    }
  }
 
  if (ncalls) {
    int cur_call = 0;
    GEN ("\n/* Function calls state machine */\n");
    GEN ("always @(posedge clk or posedge rst)\n");
    GEN ("begin\n");
    GEN ("  if (rst) begin\n");
    GEN ("    f_stb <= #Tp %i'h0;\n", nstores);
    for (i = 0; i < 6; i++) GEN ("    fr%i_o <= #Tp 32'h0;\n", i + 3);
    if (log2_int(ncalls)) GEN ("    fid_o <= #Tp %i'h0;\n", log2_int (f->nfdeps));
    GEN ("    fstart_o <= #Tp 1'b0;\n");
    //GEN ("    f11_r <= #Tp 32'h0;\n");
    GEN ("  end else begin\n");
    cucdebug (1, "calls \n");
    for (i = 0; i < f->nmsched; i++) if (f->mtype[i] & MT_CALL) {
      dep_list *dep = f->INSN(f->msched[i]).dep;
      cucdebug (1, "msched[%i] = %x (mtype %x)\n", i, f->msched[i], f->mtype[i]);
      assert (f->INSN(f->msched[i]).opt[1] & (OPT_REF | OPT_REGISTER));
      GEN ("    if (");
      print_deps (fo, f, REF_BB(f->msched[i]), f->INSN(f->msched[i]).dep, 1);
      GEN (") begin\n");
      print_turn_off_dep (fo, f, dep);
      GEN ("      f_stb[%i] <= #Tp 1'b1;\n", cur_call++);
      GEN ("      fstart_o <= #Tp 1'b1;\n");
      if (log2_int (f->nfdeps))
        GEN ("      fid_o <= #Tp %i'h%x;\n", log2_int (f->nfdeps), func_index (f, f->msched[i]));
 
      for (j = 0; j < 6; j++)
        GEN ("      fr%i_o <= #Tp t%x_%x;\n", j + 3,
                       REF_BB (f->msched[i]), REF_I (f->msched[i]) - 6 + i);
      GEN ("    end\n");
    }
    GEN ("    if (f_end[%i]) begin\n", ncalls - 1);
    GEN ("      f_stb <= #Tp %i'h0;\n", ncalls);
    GEN ("      f_start_o <= #Tp 1'b0;\n");
    GEN ("    end\n");
    GEN ("  end\n");
    GEN ("end\n");
  }
 
  GEN ("\n/* Basic blocks state machine */\n");
  GEN ("always @(posedge clk or posedge rst)\n");
  GEN ("begin\n");
  GEN ("  if (rst) bb_stb <= #Tp %i'h%x;\n", f->num_bb, 0);
  GEN ("  else if (end_o) begin\n");
  GEN ("    bb_stb <= #Tp %i'h%x;\n", f->num_bb, 0);
  for (i = 0; i < f->num_bb; i++) {
    GEN ("  end else if (bb_start[%i]) begin\n", i);
    GEN ("    bb_stb <= #Tp %i'h%x;\n", f->num_bb, 1 << i);
  }
  GEN ("  end else if (end_o) begin\n");
  GEN ("    bb_stb <= #Tp %i'h%x;\n", f->num_bb, 0);
  GEN ("  end\n");
  GEN ("end\n");
 
  /* output footer */
  GEN ("\nendmodule\n");
 
  fclose (fo);
}
 
void generate_main (int nfuncs, cuc_func **f, char *filename)
{
  FILE *fo;
  int i, j, nrf, first;
  char tmp[256];
  int ncallees[MAX_FUNCS];
  int nl[MAX_FUNCS], ns[MAX_FUNCS];
  int maxncallees = 0;
  sprintf (tmp, "%s_top.v", filename);
 
  for (i = 0, nrf = 0; i < nfuncs; i++) {
    nl[i] = ns[i] = 0;
    ncallees[i] = 0;
    if (f[i]) {
      f[i]->tmp = nrf++;
      for (j = 0; j < f[i]->nmsched; j++)
        if (f[i]->mtype[j] & MT_LOAD) nl[i]++;
        else if (f[i]->mtype[j] & MT_STORE) ns[i]++;
      for (j = 0; j < f[i]->nfdeps; j++)
        ncallees[f[i]->fdeps[j]->tmp]++;
    }
  }
  if (!nrf) return;
 
  for (i = 0; i < nrf; i++)
    if (maxncallees < ncallees[i]) maxncallees = ncallees[i];
 
  log ("Generating verilog file \"%s\"\n", tmp);
  PRINTF ("Generating verilog file \"%s\"\n", tmp);
  if ((fo = fopen (tmp, "wt+")) == NULL) {
    fprintf (stderr, "Cannot open '%s'\n", tmp);
    exit (1);
  }
 
  /* output header */
  GEN ("/* %s -- generated by Custom Unit Compiler\n", tmp);
  GEN ("   (C) 2002 Opencores */\n\n"); 
  GEN ("/* Includes %i functions:", nrf);
  for (i = 0; i < nfuncs; i++) if (f[i])
    GEN ("\n%s", prof_func[i].name);
  GEN (" */\n\n");
 
  GEN ("`include \"timescale.v\"\n\n");
  GEN ("module %s (clk, rst,\n", filename);
  GEN ("              /* Load and store master Wishbone ports */\n");
  GEN ("              l_adr_o, l_dat_i, l_cyc_o, l_stb_o,\n");
  GEN ("              l_sel_o, l_linbrst_o, l_rdy_i, l_we_o,\n");
  GEN ("              s_adr_o, s_dat_o, s_cyc_o, s_stb_o,\n");
  GEN ("              s_sel_o, s_linbrst_o, s_rdy_i, s_we_o,\n\n");
  GEN ("              /* cuc interface */\n");
  GEN ("              cuc_stb_i, cuc_adr_i, cuc_dat_i, cuc_dat_o, cuc_we_i, cuc_rdy_o);\n\n");
 
  GEN ("parameter Tp = 1;\n");
  GEN ("\n/* module ports */\n");
  GEN ("input         clk, rst, cuc_stb_i, cuc_we_i;\n");
  GEN ("input         l_rdy_i, s_rdy_i;\n");
  GEN ("output        l_cyc_o, l_stb_o, l_we_o, l_linbrst_o;\n");
  GEN ("reg           l_cyc_o, l_stb_o, l_we_o, l_linbrst_o;\n");
  GEN ("output        s_cyc_o, s_stb_o, s_we_o, s_linbrst_o;\n");
  GEN ("reg           s_cyc_o, s_stb_o, s_we_o, s_linbrst_o;\n");
  GEN ("output        cuc_rdy_o; /* Not registered ! */\n");
  GEN ("output  [3:0] l_sel_o, s_sel_o;\n");
  GEN ("reg     [3:0] l_sel_o, s_sel_o;\n");
  GEN ("output [31:0] l_adr_o, s_adr_o, s_dat_o, cuc_dat_o;\n");
  GEN ("reg    [31:0] l_adr_o, s_adr_o, s_dat_o, cuc_dat_o;\n");
  GEN ("input  [15:0] cuc_adr_i;\n");
  GEN ("input  [31:0] l_dat_i, cuc_dat_i;\n\n");
 
  GEN ("wire   [%2i:0] i_we, i_re, i_finish, i_selected, i_first_reg;\n", nrf - 1);
  GEN ("wire   [%2i:0] i_bidok, i_start_bid, i_start_bidok, main_start, main_end;\n", nrf - 1);
  GEN ("wire   [%2i:0] i_start, i_end, i_start_block, i_busy;\n", nrf - 1);
  GEN ("wire   [%2i:0] i_l_req, i_s_req;\n", nrf - 1);
  GEN ("reg    [%2i:0] i_go_bsy, main_start_r;\n", nrf - 1);
 
  GEN ("assign i_selected = {\n");
  for (i = 0; i < nrf; i++)
    GEN ("    cuc_adr_i[15:6] == %i%s\n", i, i < nrf - 1 ? "," : "};");
 
  GEN ("assign i_first_reg = {\n");
  for (i = 0; i < nfuncs; i++) if (f[i]) {
    for (j = 0; j <= MAX_REGS; j++) if (f[i]->used_regs[j]) break;
    GEN ("    cuc_adr_i[5:0] == %i%s\n", j, f[i]->tmp < nrf - 1 ? "," : "};");
  }
 
  GEN ("assign i_we = {%i{cuc_stb_i && cuc_we_i}} & i_selected;\n", nrf);
  GEN ("assign i_re = {%i{cuc_stb_i && !cuc_we_i}} & i_selected;\n", nrf);
 
  GEN ("assign i_start = i_go_bsy & {%i{cuc_rdy_o}};\n", nrf);
  GEN ("assign i_start_bidok = {\n");
  for (i = 0; i < nrf; i++)
    GEN ("    i_start_bid[%i] < %i%s\n", i, i, i < nrf - 1 ? "," : "};");
  GEN ("assign main_start = i_start & i_selected & i_first_reg & i_we;\n");
  GEN ("assign main_end = {%i{i_end}} & i_selected;\n");
 
  GEN ("\nalways @(posedge clk or posedge rst)\n");
  GEN ("begin\n");
  GEN ("  if (rst) i_go_bsy <= #Tp %i'b0;\n", nrf);
  GEN ("  else i_go_bsy <= #Tp i_we | ~i_finish & i_go_bsy;\n");
  GEN ("end\n");
 
 
  /* Function specific data */
  for (i = 0; i < nfuncs; i++) if (f[i]) {
    int ci = 0, co = 0;
    int fn = f[i]->tmp;
    GEN ("\n/* Registers for function %s */\n", prof_func[i].name);
    for (j = 0, first = 1; j < MAX_REGS; j++) if (f[i]->used_regs[j]) {
      GEN ("%s i%i_r%ii", first ? "/* inputs */\nreg    [31:0]" : ",", fn, j);
      first = 0;
      ci++;
    }
    if (ci) GEN (";\n");
 
    for (j = 0, first = 1; j < MAX_REGS; j++)
      if (f[i]->lur[j] >= 0 && !f[i]->saved_regs[j]) {
        GEN ("%s i%i_r%io", first ? "/* outputs */\nwire   [31:0]" : ",", fn, j);
        first = 0;
        co++;
      }
    if (co) GEN (";\n");
    GEN ("wire [31:0] i%i_l_adr, i%i_s_adr;\n", fn, fn);
 
    GEN ("always @(posedge clk or posedge rst)\n");
    GEN ("  if (rst) main_start_r <= #Tp %i'b0;\n", nrf);
    GEN ("  else main_start_r <= #Tp main_start & i_start_bidok | i_busy | ~i_end & main_start_r;\n");
 
    if (ci) {
      GEN ("\n/* write register access */\n");
      GEN ("always @(posedge clk or posedge rst)\n");
      GEN ("begin\n");
      GEN ("  if (rst) begin\n");
      for (j = 0; j < MAX_REGS; j++) if (f[i]->used_regs[j])
        GEN ("    i%i_r%ii <= #Tp 32'h0;\n", fn, j);
      GEN ("  end else if (!i_go_bsy[%i] && i_we[%i])\n", fn, fn);
      GEN ("    case (cuc_adr_i[5:0])\n");
      for (j = 0; j < MAX_REGS; j++) if (f[i]->used_regs[j])
        GEN ("      %-2i: i%i_r%ii <= #Tp cuc_dat_i;\n", j, fn, j);
      GEN ("    endcase\n");
      GEN ("end\n");
    }
 
    GEN ("\n");
  }
 
  /* Generate machine for reading all function registers. Register read can be
     delayed till function completion */
  {
    int co;
    GEN ("/* read register access - data */\n");
    GEN ("always @(posedge clk or posedge rst)\n");
    GEN ("  if (rst) cuc_dat_o <= #Tp 32'h0;\n");
    GEN ("  else if (cuc_stb_i && cuc_we_i) begin\n");
    GEN ("    ");
 
    for (i = 0; i < nfuncs; i++) if (f[i]) {
      co = 0;
      for (j = 0; j < MAX_REGS; j++)
        if (f[i]->lur[j] >= 0 && !f[i]->saved_regs[j]) co++;
 
      GEN ("if (cuc_adr_i[15:6] == %i)", f[i]->tmp);
      if (co) {
        first = 1;
        GEN ("\n      case (cuc_adr_i[5:0])\n");
        for (j = 0; j < MAX_REGS; j++) 
          if (f[i]->lur[j] >= 0 && !f[i]->saved_regs[j])
            GEN ("        %-2i: cuc_dat_o <= #Tp i%i_r%io;\n", j, f[i]->tmp, j);
        GEN ("      endcase\n");
      } else {
        GEN ("      cuc_dat_o <= #Tp 32'hx;\n");
      }
      GEN ("    else ");
    }
    GEN ("cuc_dat_o <= #Tp 32'hx;\n");
    GEN ("  end else cuc_dat_o <= #Tp 32'hx;\n");
 
    GEN ("\n/* read register access - acknowledge */\n");
    GEN ("assign cuc_rdy_o = cuc_stb_i && cuc_we_i && |(i_selected & main_end);\n");
  }
 
  /* Store/load Wishbone bridge */
  for (j = 0; j < 2; j++) {
    char t = j ? 's' : 'l';
    GEN ("\n/* %s Wishbone bridge */\n", j ? "store" : "load");
    GEN ("reg [%i:0] %cm_sel;\n", log2_int (nrf), t);
    GEN ("reg [%i:0] %cm_bid;\n", log2_int (nrf), t);
    GEN ("reg       %ccyc_ip;\n\n", t);
    GEN ("always @(posedge clk)\n");
    GEN ("begin\n");
    GEN ("  %c_we_o <= #Tp 1'b%i;\n", t, j);
    GEN ("  %c_cyc_o <= #Tp |i_%c_req;\n", t, t);
    GEN ("  %c_stb_o <= #Tp |i_%c_req;\n", t, t);
    GEN ("end\n");
 
    GEN ("\n/* highest bid */\n");
    GEN ("always @(");
    for (i = 0; i < nrf; i++) GEN ("%si_%c_req", i > 0 ? " or " : "", t);
    GEN (")\n");
    for (i = 0; i < nrf; i++) GEN ("  %sif (i_%c_req) %cm_bid = %i'h%x;\n",
                    i ? "else " : "", t, t, log2_int (nrf) + 1, i);
 
    GEN ("\n/* selected transfer */\n");
    GEN ("always @(posedge clk or posedge rst)\n");
    GEN ("  if (rst) %cm_sel <= #Tp %i'h0;\n", t, log2_int (nrf) + 1);
    GEN ("  else if (%c_rdy_i) %cm_sel <= #Tp %i'h0;\n", t, t, log2_int (nrf) + 1);
    GEN ("  else if (!%ccyc_ip) %cm_sel <= #Tp %cm_bid;\n", t, t, t);
 
    GEN ("\n/* Cycle */\n");
    GEN ("\nalways @(posedge clk or posedge rst)\n");
    GEN ("  if (rst) %ccyc_ip <= #Tp 1'b0;\n", t);
    GEN ("  else if (%c_rdy_i) %ccyc_ip <= #Tp 1'b0;\n", t, t);
    GEN ("  else %ccyc_ip <= #Tp %c_cyc_o;\n", t, t);
  }
 
  GEN ("\n/* Acknowledge */\n");
  for (i = 0; i < nrf; i++) {
    GEN ("wire i%i_s_rdy = ((sm_bid == %i & !scyc_ip) | sm_sel == %i) & s_rdy_i;\n", i, i, i);
    GEN ("wire i%i_l_rdy = ((lm_bid == %i & !lcyc_ip) | lm_sel == %i) & l_rdy_i;\n", i, i, i);
  }
 
  GEN ("\n/* data, address selects and burst enables */\n");
  for (i = 0; i < nrf; i++) GEN ("wire [31:0] i%i_s_dat;\n", i);
  for (i = 0; i < nrf; i++) GEN ("wire i%i_s_linbrst, i%i_l_linbrst;\n", i, i);
  for (i = 0; i < nrf; i++) GEN ("wire [3:0]  i%i_s_sel, i%i_l_sel;\n", i, i);
  for (i = 0; i < nrf; i++) GEN ("wire [31:0] i%i_l_dat = l_dat_i;\n", i);
  GEN ("\nalways @(posedge clk)\n");
  GEN ("begin\n");
  GEN ("  s_dat_o <= #Tp ");
  for (i = 0; i < nrf - 1; i++)
    GEN ("\n    sm_bid == %i ? i%i_s_dat : ", i, i);
  GEN ("i%i_s_dat;\n", nrf - 1);
  GEN ("  s_adr_o <= #Tp ");
  for (i = 0; i < nrf - 1; i++)
    GEN ("\n    sm_bid == %i ? i%i_s_adr : ", i, i);
  GEN ("i%i_s_adr;\n", nrf - 1);
  GEN ("  s_sel_o <= #Tp ");
  for (i = 0; i < nrf - 1; i++)
    GEN ("\n    sm_bid == %i ? i%i_s_sel : ", i, i);
  GEN ("i%i_s_sel;\n", nrf - 1);
  GEN ("  s_linbrst_o <= #Tp ");
  for (i = 0; i < nrf - 1; i++)
    GEN ("\n    sm_bid == %i ? i%i_s_linbrst : ", i, i);
  GEN ("i%i_s_linbrst;\n", nrf - 1);
  GEN ("end\n\n");
 
  GEN ("always @(posedge clk)\n");
  GEN ("begin\n");
  GEN ("  l_adr_o <= #Tp ");
  for (i = 0; i < nrf - 1; i++)
    GEN ("\n    lm_bid == %i ? i%i_l_adr : ", i, i);
  GEN ("i%i_l_adr;\n", nrf - 1);
  GEN ("  l_sel_o <= #Tp ");
  for (i = 0; i < nrf - 1; i++)
    GEN ("\n    lm_bid == %i ? i%i_l_sel : ", i, i);
  GEN ("i%i_l_sel;\n", nrf - 1);
  GEN ("  l_linbrst_o <= #Tp ");
  for (i = 0; i < nrf - 1; i++)
    GEN ("\n    lm_bid == %i ? i%i_l_linbrst : ", i, i);
  GEN ("i%i_l_linbrst;\n", nrf - 1);
  GEN ("end\n\n");
 
  /* start/end signals */
  GEN ("\n\n/* start/end signals */\n");
  for (i = 0; i < nrf; i++) {
    if (log2_int (maxncallees + 1))
      GEN ("wire [%i:0] i%i_current = i%i_busy ? i%i_current_r : i%i_start_bid;\n",
        log2_int (maxncallees + 1), i, i, i, i, i);
    else GEN ("wire i%i_current = 0;\n", i);
  }
  GEN ("\n");
 
  for (i = 0, j = 0; i < nfuncs; i++) if (f[i]) {
    if (log2_int (ncallees[i])) {
      GEN ("reg [%i:0] i%i_start_bid;\n", log2_int (ncallees[i]), j);
      GEN ("always @(start%i", f[i]->tmp);
      for (j = 0, first = 1; j < f[i]->nfdeps; j++)
        if (f[i]->fdeps[j]) GEN (", ");
      GEN (")\n");
      GEN ("begin !!!\n"); //TODO
      GEN ("  \n");
      GEN ("end\n");
    }
    GEN ("wire i%i_start = main_start[%i];\n", j, j);
    j++;
  }
  GEN ("\n");
 
  for (i = 0; i < nfuncs; i++) if (f[i]) {
    int nf = f[i]->tmp;
    GEN ("\n%s%s i%i(.clk(clk), .rst(rst),\n", filename, prof_func[i].name, nf);
    GEN ("  .l_adr_o(i%i_l_adr), .l_dat_i(i%i_l_dat), .l_req_o(i_l_req[%i]),\n",
                    nf, nf, nf);
    GEN ("  .l_sel_o(i%i_l_sel), .l_linbrst_o(i%i_l_linbrst), .l_rdy_i(i%i_l_rdy),\n",
                    nf, nf, nf);
    GEN ("  .s_adr_o(i%i_s_adr), .s_dat_o(i%i_s_dat), .s_req_o(i_s_req[%i]),\n",
                    nf, nf, nf);
    GEN ("  .s_sel_o(i%i_s_sel), .s_linbrst_o(i%i_s_linbrst), .s_rdy_i(i%i_s_rdy),\n",
                    nf, nf, nf);
    GEN ("  ");
    for (j = 0, first = 1; j < MAX_REGS; j++) if (f[i]->used_regs[j])
      GEN (".r%i_i(i%i_r%ii), ", j, nf, j), first = 0;
 
    if (first) GEN ("\n  ");
    for (j = 0, first = 1; j < MAX_REGS; j++)
      if (f[i]->lur[j] >= 0 && !f[i]->saved_regs[j])
        GEN (".r%i_o(i%i_r%io), ", j, nf, j), first = 0;
    if (first) GEN ("\n  ");
    if (f[i]->nfdeps) {
      GEN (".fstart_o(i_fstart[%i]), .fend_i(i_fend[%i]), .fid_o(i%i_fid),\n", i, i, i), 
      GEN ("  .fr3_o(i%i_fr3), .fr4_o(i%i_fr4), .fr5_o(i%i_fr5), .fr6_o(i%i_fr6),\n");
      GEN ("  .fr7_o(i%i_fr7), .fr8_o(i%i_fr8), .fr11_i(i%i_fr11i),\n  ");
    }
    GEN (".start_i(i_start[%i]), .end_o(i_end[%i]), .busy_o(i_busy[%i]));\n", nf, nf, nf);
  }
 
  /* output footer */
  GEN ("\nendmodule\n");
 
  fclose (fo);
}