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/* load.c -- OpenRISC Custom Unit Compiler, instruction loading and converting

 *    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 "cuc.h"

#include "opcode/or32.h"

#include "insn.h"

static const cuc_conv conv[] = {

{"l.add", II_ADD}, {"l.addi", II_ADD},

{"l.sub", II_SUB}, {"l.subi", II_SUB},

{"l.and", II_AND}, {"l.andi", II_AND},

{"l.xor", II_XOR}, {"l.xori", II_XOR},

{"l.or",  II_OR }, {"l.ori",  II_OR},

{"l.mul", II_MUL}, {"l.muli", II_MUL},

{"l.sra", II_SRA}, {"l.srai", II_SRA},

{"l.srl", II_SRL}, {"l.srli", II_SRL},

{"l.sll", II_SLL}, {"l.slli", II_SLL},

{"l.lbz",II_LB | II_MEM}, {"l.lbs", II_LB | II_MEM | II_SIGNED},

{"l.lhz",II_LH | II_MEM}, {"l.lhs", II_LH | II_MEM | II_SIGNED},

{"l.lwz",II_LW | II_MEM}, {"l.lws", II_LW | II_MEM | II_SIGNED},

{"l.sb", II_SB | II_MEM}, {"l.sh",  II_SH | II_MEM}, {"l.sw", II_SW | II_MEM},

{"l.sfeq",  II_SFEQ }, {"l.sfeqi", II_SFEQ},

{"l.sfne",  II_SFNE }, {"l.sfnei", II_SFNE},

{"l.sflts", II_SFLT | II_SIGNED}, {"l.sfltis", II_SFLT | II_SIGNED},

{"l.sfltu", II_SFLT}, {"l.sfltiu", II_SFLT},

{"l.sfgts", II_SFGT | II_SIGNED}, {"l.sfgtis", II_SFGT | II_SIGNED},

{"l.sfgtu", II_SFGT}, {"l.sfgtiu", II_SFGT},

{"l.sfges", II_SFGE | II_SIGNED}, {"l.sfgeis", II_SFGE | II_SIGNED},

{"l.sfgeu", II_SFGE}, {"l.sfgeiu", II_SFGE},

{"l.sfles", II_SFLE | II_SIGNED}, {"l.sfleis", II_SFLE | II_SIGNED},

{"l.sfleu", II_SFLE}, {"l.sfleiu", II_SFLE},

{"l.j",     II_BF   },

{"l.bf",    II_BF   },

{"l.nop",   II_NOP  }

};

/* Instructions from function */

cuc_insn insn[MAX_INSNS];

int num_insn;

int reloc[MAX_INSNS];

/* Prints out instructions */

void print_cuc_insns (char *s, int verbose)

{

  int i, j;

  printf ("****************** %s ******************\n", s);

  print_insns (insn, num_insn,verbose);

  printf ("\n\n");

}

void xchg_insn (int i, int j)

{

  cuc_insn t;

  t = insn[i];

  insn[i] = insn[j];

  insn[j] = t;

}

/* Remove delay slots */

void remove_dslots ()

{

  int i;

  int in_delay = 0;

  for (i = 0; i < num_insn; i++) {

    if (in_delay) insn[i].type |= IT_INDELAY;

    in_delay = 0;

    if (insn[i].type & IT_BRANCH) in_delay = 1;

    if (insn[i].type & IT_INDELAY) {

      /* delay slot should not be a branch target! */

      assert ((insn[i].type & IT_BBSTART) == 0);

      assert ((insn[i - 1].type & IT_INDELAY) == 0);

      insn[i].type &= ~IT_INDELAY; /* no more in delay slot */

      xchg_insn (i, i - 1);

    }

  }

  assert (in_delay == 0);

}

/* Convert local variables (uses stack frame -- r1) to internal values */

void detect_locals ()

{

  int stack[MAX_STACK];

  int i, can_remove_stack = 1;

  int real_stack_size = 0;

  for (i = 0; i < MAX_STACK; i++) stack[i] = -1;

  for (i = 0; i < num_insn; i++) {

    /* sw off (r1),rx */

    if (insn[i].index == II_SW

      && (insn[i].opt[0] & OPT_CONST)

      && insn[i].op[1] == 1 && (insn[i].opt[1] & OPT_REGISTER)) {

      if (insn[i].op[0] < MAX_STACK) { /* Convert to normal move */

        stack[insn[i].op[0]] = i;

        insn[i].type &= IT_INDELAY | IT_BBSTART;

        change_insn_type (&insn[i], II_ADD);

        insn[i].op[0] = -1; insn[i].opt[0] = OPT_REGISTER | OPT_DEST;

        insn[i].op[1] = insn[i].op[2]; insn[i].opt[1] = insn[i].opt[2];

        insn[i].op[2] = 0; insn[i].opt[2] = OPT_CONST;

      } else can_remove_stack = 0;

    /* lw rx,off (r1) */

    } else if (insn[i].index == II_LW

      && (insn[i].opt[1] & OPT_CONST)

      && insn[i].op[2] == 1 && (insn[i].opt[2] & OPT_REGISTER)) {

      if (insn[i].op[1] < MAX_STACK) { /* Convert to normal move */

        insn[i].type &= IT_INDELAY | IT_BBSTART;

        change_insn_type (&insn[i], II_ADD);

        assert (stack[insn[i].op[1]] >= 0);

        insn[i].op[1] = stack[insn[i].op[1]]; insn[i].opt[1] = OPT_REF;

        insn[i].op[2] = 0; insn[i].opt[2] = OPT_CONST;

      } else can_remove_stack = 0;

    /* Check for defined stack size */

    } else if (insn[i].index == II_ADD && !real_stack_size

            && (insn[i].opt[0] & OPT_REGISTER) && insn[i].op[0] == 1

            && (insn[i].opt[1] & OPT_REGISTER) && insn[i].op[1] == 1

            && (insn[i].opt[2] & OPT_CONST)) {

      real_stack_size = -insn[i].op[2];

    }

  }

  assert (can_remove_stack); /* TODO */

}

/* Disassemble one instruction from insn index and generate parameters */

const char *build_insn (unsigned long data, cuc_insn *insn)

{

  const char *name;

  char *s;

  extern char *disassembled;

  int index = insn_decode (data);

  struct or32_opcode const *opcode;

  int i, argc = 0;

  insn->insn = data;

  insn->index = -1;

  insn->type = 0;

  name = insn_name (index);

  insn->index = index;

  disassemble_index (data, index);

  strcpy (insn->disasm, disassembled);

  insn->dep = NULL;

  for (i = 0; i < MAX_OPERANDS; i++) insn->opt[i] = OPT_NONE;

  if (index < 0) {

    fprintf (stderr, "Invalid opcode 0x%08x!\n", data);

    exit (1);

  }

  opcode = &or32_opcodes[index];

  for (s = opcode->args; *s != '\0'; ++s) {

    switch (*s) {

    case '\0': return name;

    case 'r':

      insn->opt[argc] = OPT_REGISTER | (argc ? 0 : OPT_DEST);

      insn->op[argc++] = or32_extract(*++s, opcode->encoding, data);

      break;

    default:

      if (strchr (opcode->encoding, *s)) {

        unsigned long imm = or32_extract (*s, opcode->encoding, data);

        imm = extend_imm(imm, *s);

        insn->opt[argc] = OPT_CONST;

        insn->op[argc++] = imm;

      }

    }

  }

  return name;

}

/* expands immediate memory instructions to two */

void expand_memory ()

{

  int i, j, num_mem = 0, d;

  for (i = 0; i < num_insn; i++) if (insn[i].type & IT_MEMORY) num_mem++;

  d = num_insn + num_mem;

  assert (d < MAX_INSNS);

  /* Split memory commands */

  for (i = num_insn - 1; i >= 0; i--) if (insn[i].type & IT_MEMORY) {

    insn[--d] = insn[i];

    insn[--d] = insn[i];

    reloc[i] = d;

    switch (insn[d].index) {

    case II_SW:

    case II_SH:

    case II_SB:

              insn[d].op[0] = -1; insn[d].opt[0] = OPT_REGISTER | OPT_DEST; /* add rd, ra, rb */

              insn[d].op[2] = insn[i].op[0]; insn[d].opt[2] = insn[i].opt[0];

              insn[d].opt[3] = OPT_NONE;

              insn[d].type &= IT_INDELAY | IT_BBSTART;

              insn[d].type |= IT_MEMADD;

              change_insn_type (&insn[d], II_ADD);

              insn[d + 1].op[1] = d; insn[d + 1].opt[1] = OPT_REF; /* sw (t($-1)),rx */

              insn[d + 1].op[0] = insn[i].op[2]; insn[d + 1].opt[0] = insn[i].opt[2];

              insn[d + 1].opt[2] = OPT_NONE;

              insn[d + 1].type &= ~IT_BBSTART;

              break;

    case II_LW:

    case II_LH:

    case II_LB:

              insn[d].op[0] = -1; insn[d].opt[0] = OPT_REGISTER | OPT_DEST; /* add rd, ra, rb */

              insn[d].type &= IT_INDELAY | IT_BBSTART;

              insn[d].type |= IT_MEMADD;

              change_insn_type (&insn[d], II_ADD);

              insn[d + 1].op[1] = d; insn[d + 1].opt[1] = OPT_REF; /* lw (t($-1)),rx */

              insn[d + 1].opt[2] = OPT_NONE;

              insn[d + 1].opt[3] = OPT_NONE;

              insn[d + 1].type &= ~IT_BBSTART;

              break;

    default:  fprintf (stderr, "%4i, %4i: %s\n", i, d, cuc_insn_name (&insn[d]));

              assert (0);

    }

  } else {

    insn[--d] = insn[i];

    reloc[i] = d;

  }

  num_insn += num_mem;

  for (i = 0; i < num_insn; i++) if (!(insn[i].type & IT_MEMORY))

    for (j = 0; j < MAX_OPERANDS; j++)

      if (insn[i].opt[j] & OPT_REF || insn[i].opt[j] & OPT_JUMP)

        insn[i].op[j] = reloc[insn[i].op[j]];

}

/* expands signed comparisons to three instructions */

void expand_signed ()

{

  int i, j, num_sig = 0, d;

  for (i = 0; i < num_insn; i++) if (insn[i].type & IT_SIGNED) num_sig++;

  d = num_insn + num_sig * 2;

  assert (d < MAX_INSNS);

  /* Split signed instructions */

  for (i = num_insn - 1; i >= 0; i--) if (insn[i].type & IT_SIGNED) {

    /* We will expand signed memory later */

    if (insn[i].type & IT_MEMORY) continue;

    insn[--d] = insn[i];

    insn[d].op[1] = d - 2; insn[d].opt[1] = OPT_REF;

    insn[d].op[2] = d - 1; insn[d].opt[2] = OPT_REF;

    insn[--d] = insn[i];

    change_insn_type (&insn[d], II_ADD);

    insn[d].type = 0;

    insn[d].op[0] = -1; insn[d].opt[0] = OPT_REGISTER | OPT_DEST;

    insn[d].op[1] = insn[d].op[2]; insn[d].opt[1] = insn[d].opt[2];

    insn[d].op[2] = 0x20000000; insn[d].opt[2] = OPT_CONST;

    insn[d].opt[3] = OPT_NONE;

    insn[--d] = insn[i];

    change_insn_type (&insn[d], II_ADD);

    insn[d].type = 0;

    insn[d].op[0] = -1; insn[d].opt[0] = OPT_REGISTER | OPT_DEST;

    insn[d].op[1] = insn[d].op[1]; insn[d].opt[1] = insn[d].opt[1];

    insn[d].op[2] = 0x20000000; insn[d].opt[2] = OPT_CONST;

    insn[d].opt[3] = OPT_NONE;

    reloc[i] = d;

  } else {

    insn[--d] = insn[i];

    reloc[i] = d;

  }

  num_insn += num_sig * 2;

  for (i = 0; i < num_insn; i++) if (insn[i].type & IT_MEMORY || !(insn[i].type & IT_SIGNED)) {

    for (j = 0; j < MAX_OPERANDS; j++)

      if (insn[i].opt[j] & OPT_REF || insn[i].opt[j] & OPT_JUMP)

        insn[i].op[j] = reloc[insn[i].op[j]];

  } else insn[i].type &= ~IT_SIGNED;

}

/* CSE -- common subexpression elimination */

void cse ()

{

  int i, j, k, l;

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

    for (j = 0; j < i; j++) {

      if (insn[i].index == insn[j].index) continue;

      if (insn[i].type & IT_VOLATILE) continue;

      /* Do we have an exact match? */

      if (insn[i].op[1] != insn[j].op[1] || insn[i].opt[1] != insn[j].opt[1]) continue;

      if (insn[i].op[2] != insn[j].op[2] || insn[i].opt[2] != insn[j].opt[2]) continue;

      /* Check if we drive outputs? */

      if ((insn[i].opt[0] & OPT_REGISTER) && insn[i].op[0] >= 0)

        if ((insn[j].opt[0] & OPT_REGISTER) && insn[j].op[0] >= 0) continue;

        else insn[j].op[0] = insn[i].op[0];

      /* remove duplicated instruction and relink the references */

      change_insn_type (&insn[i], II_NOP);

      for (k = i + 1; k < num_insn; k++)

        for (l = 0; l < MAX_OPERANDS; l++)

           if (insn[k].op[l] == i && (insn[k].opt[l] & OPT_REF)) insn[k].op[l] = j;

    }

}

/* Loads from file into global array insn */

void cuc_load (char *in_fn)

{

  int i, j, in_delay;

  FILE *fi;

  int func_return = 0;

  num_insn = 0;

  log ("Loading filename %s\n", in_fn);

  if ((fi = fopen (in_fn, "rt")) == NULL) {

    fprintf (stderr, "Cannot open '%s'\n", in_fn);

    exit (1);

  }

  /* Read in the function and decode the instructions */

  for (i = 0;; i++) {

    unsigned long data;

    extern char *disassembled;

    const char *name;

    if (fscanf (fi, "%08x\n", &data) != 1) break;

    /* build params */

    name = build_insn (data, &insn[i]);

    if (func_return) func_return++;

    //printf ("%s\n", name);

    if (or32_opcodes[insn[i].index].flags & OR32_IF_DELAY) {

      int f;

      if (strcmp (name, "l.bnf") == 0) f = 1;

      else if (strcmp (name, "l.bf") == 0) f = 0;

      else if (strcmp (name, "l.j") == 0) {

        f = -1;

      } else if (strcmp (name, "l.jr") == 0 && func_return == 0) {

        func_return = 1;

        change_insn_type (&insn[i], II_NOP);

        continue;

      } else {

        fprintf (stderr, "Instruction #%i: \"%s\" not supported.\n", i, name);

        exit (1);

      }

      if (f < 0) { /* l.j */

        /* repair params */

        change_insn_type (&insn[i], II_BF);

        insn[i].op[0] = i + insn[i].op[0]; insn[i].opt[0] = OPT_JUMP;

        insn[i].op[1] = 1; insn[i].opt[1] = OPT_CONST;

        insn[i].type |= IT_BRANCH | IT_VOLATILE;

      } else {

        i--;

        if (f) {

          //printf ("%s\n", cuc_insn_name (&insn[i]));

          if (insn[i].index == II_SFEQ) change_insn_type (&insn[i], II_SFNE);

          else if (insn[i].index == II_SFNE) change_insn_type (&insn[i], II_SFEQ);

          else if (insn[i].index == II_SFLT) change_insn_type (&insn[i], II_SFGE);

          else if (insn[i].index == II_SFGT) change_insn_type (&insn[i], II_SFLE);

          else if (insn[i].index == II_SFLE) change_insn_type (&insn[i], II_SFGT);

          else if (insn[i].index == II_SFGE) change_insn_type (&insn[i], II_SFLT);

          else assert (0);

        }

        /* repair params */

        insn[i].op[2] = insn[i].op[1]; insn[i].opt[2] = insn[i].opt[1] & ~OPT_DEST;

        insn[i].op[1] = insn[i].op[0]; insn[i].opt[1] = insn[i].opt[0] & ~OPT_DEST;

        insn[i].op[0] = FLAG_REG; insn[i].opt[0] = OPT_DEST | OPT_REGISTER;

        insn[i].opt[3] = OPT_NONE;

        insn[i].type |= IT_COND;

        i++;

        change_insn_type (&insn[i], II_BF);

        insn[i].op[0] = i + insn[i].op[0]; insn[i].opt[0] = OPT_JUMP;

        insn[i].op[1] = FLAG_REG; insn[i].opt[1] = OPT_REGISTER;

        insn[i].type |= IT_BRANCH | IT_VOLATILE;

      }

    } else {

      insn[i].index = -1;

      for (j = 0; j < sizeof (conv) / sizeof (cuc_conv); j++)

        if (strcmp (conv[j].from, name) == 0) {

          const int x = conv[j].to;

          if (conv[j].to & II_SIGNED) insn[i].type |= IT_SIGNED;

          if (conv[j].to & II_MEM) insn[i].type |= IT_MEMORY | IT_VOLATILE;

          change_insn_type (&insn[i], conv[j].to & II_MASK);

          break;

        }

      if (insn[i].index < 0) {

        fprintf (stderr, "Instruction #%i: \"%s\" not supported (2).\n", i, name);

        exit (1);

      }

    }

  }

  num_insn = i;

  fclose (fi);

  if (func_return != 2) {

    fprintf (stderr, "Unsupported function structure.\n");

    exit (1);

  }

  log ("Number of instructions loaded = %i\n", num_insn);

  if (DEBUG > 3) print_cuc_insns ("INITIAL", 1);

  log ("Converting.\n");

  remove_dslots ();

  if (DEBUG > 8) print_cuc_insns ("NO_DELAY_SLOTS", 0);

  if (calling_convention) {

    detect_locals ();

    if (DEBUG > 7) print_cuc_insns ("AFTER_LOCALS", 0);

  }

  expand_memory ();

  if (DEBUG > 3) print_cuc_insns ("AFTER_EXP_MEM", 0);

  expand_signed ();

  if (DEBUG > 3) print_cuc_insns ("AFTER_EXP_SIG", 0);

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

  cse ();

  if (DEBUG > 8) print_cuc_insns ("AFTER_CSE", 0);

}