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/* memory.c -- OpenRISC Custom Unit Compiler, memory optimization and scheduling
 *    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 "abstract.h"
#include "sim-config.h"
#include "cuc.h"
#include "insn.h"
 
 
/* Cleans memory & data dependencies */
void clean_deps (cuc_func *f)
{
  int b, i;
  dep_list *t;
  for (b = 0; b < f->num_bb; b++) {
    for (i = 0; i < f->bb[b].ninsn; i++) {
      t = f->bb[b].insn[i].dep;
      while (t) {
        dep_list *tmp = t;
        t = t->next;
        free (tmp);
      }
      f->bb[b].insn[i].dep = NULL;
    }
 
    t = f->bb[b].mdep;
    while (t) {
      dep_list *tmp = t;
      t = t->next;
      free (tmp);
    }
    f->bb[b].mdep = NULL;
  }
 
  f->nmsched = 0;
}
 
/* Checks for memory conflicts between two instructions; returns 1 if detected
 
static int check_memory_conflict (cuc_func *f, cuc_insn *a, cuc_insn *b, int otype)
{
  switch (otype) {
    case MO_EXACT: /* exact */
    case MO_STRONG: /* strong */
      return 1;
    case MO_WEAK: /* weak */
      assert (a->type & IT_MEMORY);
      assert (b->type & IT_MEMORY);
      if ((a->opt[1] & OPT_REF) && f->INSN(a->op[1]).index == II_ADD
        &&(b->opt[1] & OPT_REF) && f->INSN(b->op[1]).index == II_ADD) {
        int aw, bw;
        assert ((aw = II_MEM_WIDTH (a->index)) >= 0);
        assert ((bw = II_MEM_WIDTH (b->index)) >= 0);
 
        a = &f->INSN(a->op[1]);
        b = &f->INSN(b->op[1]);
        if (a->opt[1] != b->opt[1] || a->op[1] != b->op[1]
         || a->opt[2] != OPT_CONST || b->opt[2] != OPT_CONST) return 1;
 
        /* Check if they overlap */
        if (a->op[2] >= b->op[2] && a->op[2] < b->op[2] + bw) return 1;
        if (b->op[2] >= a->op[2] && b->op[2] < a->op[2] + aw) return 1;
        return 0;
      } else return 1;
    case MO_NONE: /* none */
      return 0;
    default:
      assert (0);
  }
  return 1;
}
 
/* Adds memory dependencies based on ordering type:
 
void add_memory_dep (cuc_func *f, int otype)
{
  int b, i;
  dep_list *all_mem = NULL;
 
  for (b = 0; b < f->num_bb; b++) {
    cuc_insn *insn = f->bb[b].insn;
    for (i = 0; i < f->bb[b].ninsn; i++)
      if (insn[i].type & IT_MEMORY) {
        dep_list *tmp = all_mem;
        while (tmp) {
          //PRINTF ("%x %x\n", REF (b,i), tmp->ref);
          if (check_memory_conflict (f, &insn[i], &f->INSN(tmp->ref), otype))
            add_dep (&insn[i].dep, tmp->ref);
          tmp = tmp->next;
        }
        add_dep (&all_mem, REF (b, i));
      }
  }
  dispose_list (&all_mem);
}
 
/* Check if they address the same location, so we can join them */
static int same_transfers (cuc_func *f, int otype)
{
  int i, j;
  int modified = 0;
  if (otype == MO_WEAK || otype == MO_NONE) {
    for (i = 1, j = 1; i < f->nmsched; i++)
      /* Exclude memory stores and different memory types */
      if (f->mtype[i - 1] == f->mtype[i] && f->mtype[i] & MT_LOAD) {
        cuc_insn *a = &f->INSN(f->msched[i - 1]);
        cuc_insn *b = &f->INSN(f->msched[i]);
        if ((a->opt[1] & OPT_REF) && f->INSN(a->op[1]).index == II_ADD
          &&(b->opt[1] & OPT_REF) && f->INSN(b->op[1]).index == II_ADD) {
          a = &f->INSN(a->op[1]);
          b = &f->INSN(b->op[1]);
          /* Not in usual form? */
          if (a->opt[1] != b->opt[1] || a->op[1] != b->op[1]
           || a->opt[2] != OPT_CONST || b->opt[2] != OPT_CONST) goto keep;
 
          //PRINTF ("%i %i, ", a->op[2], b->op[2]);
 
          /* Check if they are the same => do not copy */
          if (a->op[2] == b->op[2]
            && REF_BB(f->msched[i - 1]) == REF_BB(f->msched[i])) {
            /* yes => remove actual instruction */
            int t1 = MIN (f->msched[i - 1], f->msched[i]);
            int t2 = MAX (f->msched[i - 1], f->msched[i]);
            int b, i, j;
            cucdebug (2, "Removing %x_%x and using %x_%x instead.\n",
              REF_BB(t2), REF_I(t2), REF_BB(t1), REF_I(t1));
            change_insn_type (&f->INSN(t2), II_NOP);
            modified = 1;
            /* Update references */
            for (b = 0; b < f->num_bb; b++)
              for (i = 0; i < f->bb[b].ninsn; i++)
                for (j = 0; j < MAX_OPERANDS; j++)
                  if (f->bb[b].insn[i].opt[j] & OPT_REF && f->bb[b].insn[i].op[j] == t2)
                    f->bb[b].insn[i].op[j] = t1;
 
          } else goto keep;
        } else goto keep;
      } else {
keep:
        f->msched[j] = f->msched[i];
        f->mtype[j++] = f->mtype[i];
      }
    f->nmsched = j;
  }
  return modified;
}
 
/* Check if two consecutive lb[zs] can be joined into lhz and if
   two consecutive lh[zs] can be joined into lwz */
static int join_transfers (cuc_func *f, int otype)
{
  int i, j;
  int modified = 0;
 
  /* We can change width even with strong memory ordering */
  if (otype == MO_WEAK || otype == MO_NONE || otype == MO_STRONG) {
    for (i = 1, j = 1; i < f->nmsched; i++)
      /* Exclude memory stores and different memory types */
      if (f->mtype[i - 1] == f->mtype[i] && f->mtype[i] & MT_LOAD) {
        cuc_insn *a = &f->INSN(f->msched[i - 1]);
        cuc_insn *b = &f->INSN(f->msched[i]);
        int aw = f->mtype[i - 1] & MT_WIDTH;
        if ((a->opt[1] & OPT_REF) && f->INSN(a->op[1]).index == II_ADD
          &&(b->opt[1] & OPT_REF) && f->INSN(b->op[1]).index == II_ADD) {
          a = &f->INSN(a->op[1]);
          b = &f->INSN(b->op[1]);
 
          /* Not in usual form? */
          if (a->opt[1] != b->opt[1] || a->op[1] != b->op[1]
           || a->opt[2] != OPT_CONST || b->opt[2] != OPT_CONST) goto keep;
 
          /* Check if they touch together */
          if (a->op[2] + aw == b->op[2]
            && REF_BB(f->msched[i - 1]) == REF_BB(f->msched[i])) {
            /* yes => remove second instruction */
            int t1 = MIN (f->msched[i - 1], f->msched[i]);
            int t2 = MAX (f->msched[i - 1], f->msched[i]);
            dep_list *t1dep = f->INSN(t1).dep;
            int x, p;
            cuc_insn *ii;
 
            cucdebug (2, "Joining %x and %x.\n", t1, t2);
            if (cuc_debug >= 8) print_cuc_bb (f, "PREJT");
            change_insn_type (&f->INSN(t1), II_NOP);
            change_insn_type (&f->INSN(t2), II_NOP);
            /* We will reuse the memadd before the first load, and add some
               custom code at the end */
            insert_insns (f, t1, 10);
            if (cuc_debug > 8) print_cuc_bb (f, "PREJT2");
 
            /* Remove all dependencies to second access */
            for (x = 0; x < f->num_bb; x++) {
              int i;
              for (i = 0; i < f->bb[x].ninsn; i++) {
                dep_list *d = f->bb[x].insn[i].dep;
                dep_list **old = &f->bb[x].insn[i].dep;
                while (d) {
                  if (d->ref == t2) {
                    d = d->next;
                    *old = d;
                  } else {
                    d = d->next;
                    old = &((*old)->next);
                  }
                }
              }
            }
 
            /* Build the folowing code:
               l[hw]z p-1
               and p-1, 0xff
               sfle p-1, 0x7f
               or p-2, 0xffffff00
               cmov p-3, p-1, p-2
               shr p-5, 8
               and p-1, 0xff
               sfle p-1 0x7f
               or p-2 0xffffff00
               cmov p-3, p-1, p-2*/
            p = REF_I(t1);
            cucdebug (8, "%x %x\n", f->mtype[i - 1], f->mtype[i]);
            for (x = 0; x < 2; x++) {
              int t = f->mtype[i - 1 + x];
              ii = &f->bb[REF_BB(t1)].insn[p];
              if (!x) {
                change_insn_type (ii, aw == 1 ? II_LH : II_LW);
                ii->type = IT_MEMORY | IT_VOLATILE;
                ii->op[0] = -1; ii->opt[0] = OPT_REGISTER | OPT_DEST;
                ii->op[1] = t1 - 1; ii->opt[1] = OPT_REF;
                ii->opt[2] = ii->opt[3] = OPT_NONE;
                ii->dep = t1dep;
                f->mtype[i - 1] = MT_LOAD | (aw == 1 ? 2 : 4);
                f->msched[i - 1] = REF (REF_BB(t1), p);
              } else {
                change_insn_type (ii, II_SRL);
                ii->type = 0;
                ii->op[0] = -1; ii->opt[0] = OPT_REGISTER | OPT_DEST;
                ii->op[1] = t1; ii->opt[1] = OPT_REF;
                ii->op[2] = 8; ii->opt[2] = OPT_CONST;
                ii->opt[3] = OPT_NONE;
              }
 
              ii = &f->bb[REF_BB(t1)].insn[++p];
              change_insn_type (ii, II_AND);
              ii->type = 0;
              ii->op[0] = -1; ii->opt[0] = OPT_REGISTER | OPT_DEST;
              ii->op[1] = REF (REF_BB(t1), p - 1); ii->opt[1] = OPT_REF;
              ii->op[2] = 0xff; ii->opt[2] = OPT_CONST;
              ii->opt[3] = OPT_NONE;
 
              ii = &f->bb[REF_BB(t1)].insn[++p];
              change_insn_type (ii, II_SFLE);
              ii->type = IT_COND;
              ii->op[0] = -1; ii->opt[0] = OPT_REGISTER | OPT_DEST;
              ii->op[1] = REF (REF_BB(t1), p - 1); ii->opt[1] = OPT_REF;
              ii->op[2] = 0x7f; ii->opt[2] = OPT_CONST;
              ii->opt[3] = OPT_NONE;
 
              ii = &f->bb[REF_BB(t1)].insn[++p];
              change_insn_type (ii, II_OR);
              ii->type = 0;
              ii->op[0] = -1; ii->opt[0] = OPT_REGISTER | OPT_DEST;
              ii->op[1] = REF (REF_BB(t1), p - 2); ii->opt[1] = OPT_REF;
              if (t & MT_SIGNED) ii->op[2] = 0xffffff00;
              else ii->op[2] = 0;
              ii->opt[2] = OPT_CONST;
              ii->opt[3] = OPT_NONE;
 
              ii = &f->bb[REF_BB(t1)].insn[++p];
              change_insn_type (ii, II_CMOV);
              ii->type = 0;
              ii->op[0] = -1; ii->opt[0] = OPT_REGISTER | OPT_DEST;
              ii->op[1] = REF (REF_BB(t1), p - 1); ii->opt[1] = OPT_REF;
              ii->op[2] = REF (REF_BB(t1), p - 3); ii->opt[2] = OPT_REF;
              ii->op[3] = REF (REF_BB(t1), p - 2); ii->opt[3] = OPT_REF;
              p++;
            }
 
            modified = 1;
 
            {
              int b, i, j;
              /* Update references */
              for (b = 0; b < f->num_bb; b++)
                for (i = 0; i < f->bb[b].ninsn; i++)
                  for (j = 0; j < MAX_OPERANDS; j++)
                    if (REF_I (f->bb[b].insn[i].op[j]) < REF_I (t1)
                     || REF_I(f->bb[b].insn[i].op[j]) >= REF_I (t1) + 10) {
                      if (f->bb[b].insn[i].opt[j] & OPT_REF && f->bb[b].insn[i].op[j] == t1)
                        f->bb[b].insn[i].op[j] = t1 + 4;
                      else if (f->bb[b].insn[i].opt[j] & OPT_REF && f->bb[b].insn[i].op[j] == t2)
                        f->bb[b].insn[i].op[j] = t1 + 9;
                    }
            }
            if (cuc_debug >= 8) print_cuc_bb (f, "POSTJT");
          } else goto keep;
        } else goto keep;
      } else {
keep:
        f->msched[j] = f->msched[i];
        f->mtype[j++] = f->mtype[i];
      }
    f->nmsched = j;
  }
  return modified;
}
 
/* returns nonzero if a < b */
int mem_ordering_cmp (cuc_func *f, cuc_insn *a, cuc_insn *b)
{
  assert (a->type & IT_MEMORY);
  assert (b->type & IT_MEMORY);
  if ((a->opt[1] & OPT_REF) && f->INSN(a->op[1]).index == II_ADD
    &&(b->opt[1] & OPT_REF) && f->INSN(b->op[1]).index == II_ADD) {
    a = &f->INSN(a->op[1]);
    b = &f->INSN(b->op[1]);
    if (a->opt[1] != b->opt[1] || a->op[1] != b->op[1]
     || a->opt[2] != OPT_CONST || b->opt[2] != OPT_CONST) return 0;
 
    /* Order linearly, we can then join them to bursts */
    return a->op[2] < b->op[2];
  } else return 0;
}
 
/* Schedule memory accesses
 
int schedule_memory (cuc_func *f, int otype)
{
  int b, i, j;
  int modified = 0;
  f->nmsched = 0;
 
  for (b = 0; b < f->num_bb; b++) {
    cuc_insn *insn = f->bb[b].insn;
    for (i = 0; i < f->bb[b].ninsn; i++)
      if (insn[i].type & IT_MEMORY) {
        f->msched[f->nmsched++] = REF (b, i);
        if (otype == MO_NONE || otype == MO_WEAK) insn[i].type |= IT_FLAG1; /* mark unscheduled */
      }
  }
 
  for (i = 0; i < f->nmsched; i++)
    cucdebug (2, "[%x]%x%c ", f->msched[i], f->mtype[i] & MT_WIDTH, (f->mtype[i] & MT_BURST) ? (f->mtype[i] & MT_BURSTE) ? 'E' : 'B' : ' ');
  cucdebug (2, "\n");
 
  /* We can reorder just more loose types
     We assume, that memory accesses are currently in valid (but not neccesserly)
     optimal order */
  if (otype == MO_WEAK || otype == MO_NONE) {
    for (i = 0; i < f->nmsched; i++) {
      int best = i;
      int tmp;
      for (j = i + 1; j < f->nmsched; j++) if (REF_BB(f->msched[j]) == REF_BB(f->msched[best])) {
        if (mem_ordering_cmp (f, &f->INSN (f->msched[j]), &f->INSN(f->msched[best]))) {
          /* Check dependencies */
          dep_list *t = f->INSN(f->msched[j]).dep;
          while (t) {
            if (f->INSN(t->ref).type & IT_FLAG1) break;
            t = t->next;
          }
          if (!t) best = j; /* no conflicts -> ok */
        }
      }
 
      /* we have to shift instructions up, to maintain valid dependencies
         and make space for best candidate */
 
      /* make local copy */
      tmp = f->msched[best];
      for (j = best; j > i; j--) f->msched[j] = f->msched[j - 1];
      f->msched[i] = tmp;
      f->INSN(f->msched[i]).type &= ~IT_FLAG1; /* mark scheduled */
    }
  }
 
  for (i = 0; i < f->nmsched; i++)
    cucdebug (2, "[%x]%x%c ", f->msched[i], f->mtype[i] & MT_WIDTH, (f->mtype[i] & MT_BURST) ? (f->mtype[i] & MT_BURSTE) ? 'E' : 'B' : ' ');
  cucdebug (2, "\n");
 
  /* Assign memory types */
  for (i = 0; i < f->nmsched; i++) {
    cuc_insn *a = &f->INSN(f->msched[i]);
    f->mtype[i] = !II_IS_LOAD(a->index) ? MT_STORE : MT_LOAD;
    f->mtype[i] |= II_MEM_WIDTH (a->index);
    if (a->type & IT_SIGNED) f->mtype[i] |= MT_SIGNED;
  }
 
  if (same_transfers (f, otype)) modified = 1;
  if (join_transfers (f, otype)) modified = 1;
 
  for (i = 0; i < f->nmsched; i++)
    cucdebug (2, "[%x]%x%c ", f->msched[i], f->mtype[i] & MT_WIDTH, (f->mtype[i] & MT_BURST) ? (f->mtype[i] & MT_BURSTE) ? 'E' : 'B' : ' ');
  cucdebug (2, "\n");
  if (cuc_debug > 5) print_cuc_bb (f, "AFTER_MEM_REMOVAL");
 
  if (config.cuc.enable_bursts) {
    //PRINTF ("\n");
    for (i = 1; i < f->nmsched; i++) {
      cuc_insn *a = &f->INSN(f->msched[i - 1]);
      cuc_insn *b = &f->INSN(f->msched[i]);
      int aw = f->mtype[i - 1] & MT_WIDTH;
 
      /* Burst can only be out of words */
      if (aw != 4) continue;
 
      if ((a->opt[1] & OPT_REF) && f->INSN(a->op[1]).index == II_ADD
        &&(b->opt[1] & OPT_REF) && f->INSN(b->op[1]).index == II_ADD) {
        a = &f->INSN(a->op[1]);
        b = &f->INSN(b->op[1]);
        /* Not in usual form? */
        if (a->opt[1] != b->opt[1] || a->op[1] != b->op[1]
         || a->opt[2] != OPT_CONST || b->opt[2] != OPT_CONST) continue;
 
        //PRINTF ("%i %i, ", a->op[2], b->op[2]);
 
        /* Check if they touch together */
        if (a->op[2] + aw == b->op[2]
          && REF_BB(f->msched[i - 1]) == REF_BB(f->msched[i])) {
          /* yes => do burst */
          f->mtype[i - 1] &= ~MT_BURSTE;
          f->mtype[i - 1] |= MT_BURST;
          f->mtype[i] |= MT_BURST | MT_BURSTE;
        }
      }
    }
  }
 
  for (i = 0; i < f->nmsched; i++)
    cucdebug (2, "[%x]%x%c ", f->msched[i], f->mtype[i] & MT_WIDTH, (f->mtype[i] & MT_BURST) ? (f->mtype[i] & MT_BURSTE) ? 'E' : 'B' : ' ');
  cucdebug (2, "\n");
 
  /* We don't need dependencies in non-memory instructions */
  for (b = 0; b < f->num_bb; b++) {
    cuc_insn *insn = f->bb[b].insn;
    for (i = 0; i < f->bb[b].ninsn; i++) if (!(insn[i].type & IT_MEMORY))
      dispose_list (&insn[i].dep);
  }
 
  if (cuc_debug > 5) print_cuc_bb (f, "AFTER_MEM_REMOVAL2");
  /* Reduce number of dependecies, keeping just direct dependencies, based on memory schedule */
  {
    int lastl[3] = {-1, -1, -1};
    int lasts[3] = {-1, -1, -1};
    int lastc[3] = {-1, -1, -1};
    int last_load = -1, last_store = -1, last_call = -1;
    for (i = 0; i < f->nmsched; i++) {
      int t = f->mtype[i] & MT_LOAD ? 0 : f->mtype[i] & MT_STORE ? 1 : 2;
      int maxl = lastl[t];
      int maxs = lasts[t];
      int maxc = lastc[t];
      dep_list *tmp = f->INSN(f->msched[i]).dep;
      cucdebug (7, "!%i %x %p\n", i, f->msched[i], tmp);
      while (tmp) {
        if (f->INSN(tmp->ref).type & IT_MEMORY && REF_BB(tmp->ref) == REF_BB(f->msched[i])) {
          cucdebug (7, "%i %x %lx\n", i, f->msched[i], tmp->ref);
          /* Search for the reference */
          for (j = 0; j < f->nmsched; j++) if (f->msched[j] == tmp->ref) break;
          assert (j < f->nmsched);
          if (f->mtype[j] & MT_STORE) {
            if (maxs < j) maxs = j;
          } else if (f->mtype[j] & MT_LOAD) {
            if (maxl < j) maxl = j;
          } else if (f->mtype[j] & MT_CALL) {
            if (maxc < j) maxc = j;
          }
        }
        tmp = tmp->next;
      }
      dispose_list (&f->INSN(f->msched[i]).dep);
      if (f->mtype[i] & MT_STORE) {
        maxs = last_store;
        last_store = i;
      } else if (f->mtype[i] & MT_LOAD) {
        maxl = last_load;
        last_load = i;
      } else if (f->mtype[i] & MT_CALL) {
        maxc = last_call;
        last_call = i;
      }
 
      if (maxl > lastl[t]) {
        add_dep (&f->INSN(f->msched[i]).dep, f->msched[maxl]);
        lastl[t] = maxl;
      }
      if (maxs > lasts[t]) {
        add_dep (&f->INSN(f->msched[i]).dep, f->msched[maxs]);
        lasts[t] = maxs;
      }
      if (maxc > lastc[t]) {
        add_dep (&f->INSN(f->msched[i]).dep, f->msched[maxc]);
        lastc[t] = maxc;
      }
      //PRINTF ("%i(%i)> ml %i(%i) ms %i(%i) lastl %i %i lasts %i %i last_load %i last_store %i\n", i, f->msched[i], maxl, f->msched[maxl], maxs, f->msched[maxs], lastl[0], lastl[1], lasts[0], lasts[1], last_load, last_store);
 
      /* What we have to wait to finish this BB? */
      if (i + 1 >= f->nmsched || REF_BB(f->msched[i + 1]) != REF_BB(f->msched[i])) {
        if (last_load > lastl[t]) {
          add_dep (&f->bb[REF_BB(f->msched[i])].mdep, f->msched[last_load]);
          lastl[t] = last_load;
        }
        if (last_store > lasts[t]) {
          add_dep (&f->bb[REF_BB(f->msched[i])].mdep, f->msched[last_store]);
          lasts[t] = last_store;
        }
        if (last_call > lastc[t]) {
          add_dep (&f->bb[REF_BB(f->msched[i])].mdep, f->msched[last_call]);
          lastc[t] = last_call;
        }
      }
    }
  }
  return modified;
}

Line No.	Rev	Author	Line
1	879	markom	`/* memory.c -- OpenRISC Custom Unit Compiler, memory optimization and scheduling`
2			`* Copyright (C) 2002 Marko Mlinar, markom@opencores.org`
3			`*`
4			`* This file is part of OpenRISC 1000 Architectural Simulator.`
5			`*`
6			`* This program is free software; you can redistribute it and/or modify`
7			`* it under the terms of the GNU General Public License as published by`
8			`* the Free Software Foundation; either version 2 of the License, or`
9			`* (at your option) any later version.`
10			`*`
11			`* This program is distributed in the hope that it will be useful,`
12			`* but WITHOUT ANY WARRANTY; without even the implied warranty of`
13			`* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the`
14			`* GNU General Public License for more details.`
15			`*`
16			`* You should have received a copy of the GNU General Public License`
17			`* along with this program; if not, write to the Free Software`
18			`* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */`
19
20			`#include <stdio.h>`
21			`#include <stdlib.h>`
22			`#include <stdarg.h>`
23			`#include <assert.h>`
24	1308	phoenix
25			`#include "abstract.h"`
26	897	markom	`#include "sim-config.h"`
27	879	markom	`#include "cuc.h"`
28			`#include "insn.h"`
29
30	941	markom
31			`/* Cleans memory & data dependencies */`
32			`void clean_deps (cuc_func *f)`
33			`{`
34			`int b, i;`
35			`dep_list *t;`
36			`for (b = 0; b < f->num_bb; b++) {`
37			`for (i = 0; i < f->bb[b].ninsn; i++) {`
38			`t = f->bb[b].insn[i].dep;`
39			`while (t) {`
40			`dep_list *tmp = t;`
41			`t = t->next;`
42			`free (tmp);`
43			`}`
44			`f->bb[b].insn[i].dep = NULL;`
45			`}`
46
47			`t = f->bb[b].mdep;`
48			`while (t) {`
49			`dep_list *tmp = t;`
50			`t = t->next;`
51			`free (tmp);`
52			`}`
53			`f->bb[b].mdep = NULL;`
54			`}`
55
56			`f->nmsched = 0;`
57			`}`
58
59	879	markom	`/* Checks for memory conflicts between two instructions; returns 1 if detected`
60
61			`static int check_memory_conflict (cuc_func f, cuc_insn a, cuc_insn *b, int otype)`
62			`{`
63			`switch (otype) {`
64	897	markom	`case MO_EXACT: /* exact */`
65			`case MO_STRONG: /* strong */`
66	879	markom	`return 1;`
67	897	markom	`case MO_WEAK: /* weak */`
68	879	markom	`assert (a->type & IT_MEMORY);`
69			`assert (b->type & IT_MEMORY);`
70			`if ((a->opt[1] & OPT_REF) && f->INSN(a->op[1]).index == II_ADD`
71			`&&(b->opt[1] & OPT_REF) && f->INSN(b->op[1]).index == II_ADD) {`
72			`int aw, bw;`
73			`assert ((aw = II_MEM_WIDTH (a->index)) >= 0);`
74			`assert ((bw = II_MEM_WIDTH (b->index)) >= 0);`
75
76			`a = &f->INSN(a->op[1]);`
77			`b = &f->INSN(b->op[1]);`
78			`if (a->opt[1] != b->opt[1] \|\| a->op[1] != b->op[1]`
79			`\|\| a->opt[2] != OPT_CONST \|\| b->opt[2] != OPT_CONST) return 1;`
80
81			`/* Check if they overlap */`
82			`if (a->op[2] >= b->op[2] && a->op[2] < b->op[2] + bw) return 1;`
83			`if (b->op[2] >= a->op[2] && b->op[2] < a->op[2] + aw) return 1;`
84			`return 0;`
85			`} else return 1;`
86	897	markom	`case MO_NONE: /* none */`
87	879	markom	`return 0;`
88			`default:`
89			`assert (0);`
90			`}`
91			`return 1;`
92			`}`
93
94			`/* Adds memory dependencies based on ordering type:`
95
96			`void add_memory_dep (cuc_func *f, int otype)`
97			`{`
98			`int b, i;`
99			`dep_list *all_mem = NULL;`
100
101			`for (b = 0; b < f->num_bb; b++) {`
102			`cuc_insn *insn = f->bb[b].insn;`
103			`for (i = 0; i < f->bb[b].ninsn; i++)`
104			`if (insn[i].type & IT_MEMORY) {`
105			`dep_list *tmp = all_mem;`
106			`while (tmp) {`
107	997	markom	`//PRINTF ("%x %x\n", REF (b,i), tmp->ref);`
108	879	markom	`if (check_memory_conflict (f, &insn[i], &f->INSN(tmp->ref), otype))`
109			`add_dep (&insn[i].dep, tmp->ref);`
110			`tmp = tmp->next;`
111			`}`
112			`add_dep (&all_mem, REF (b, i));`
113			`}`
114			`}`
115			`dispose_list (&all_mem);`
116			`}`
117
118	953	markom	`/* Check if they address the same location, so we can join them */`
119			`static int same_transfers (cuc_func *f, int otype)`
120			`{`
121			`int i, j;`
122			`int modified = 0;`
123			`if (otype == MO_WEAK \|\| otype == MO_NONE) {`
124			`for (i = 1, j = 1; i < f->nmsched; i++)`
125			`/* Exclude memory stores and different memory types */`
126			`if (f->mtype[i - 1] == f->mtype[i] && f->mtype[i] & MT_LOAD) {`
127			`cuc_insn *a = &f->INSN(f->msched[i - 1]);`
128			`cuc_insn *b = &f->INSN(f->msched[i]);`
129			`if ((a->opt[1] & OPT_REF) && f->INSN(a->op[1]).index == II_ADD`
130			`&&(b->opt[1] & OPT_REF) && f->INSN(b->op[1]).index == II_ADD) {`
131			`a = &f->INSN(a->op[1]);`
132			`b = &f->INSN(b->op[1]);`
133			`/* Not in usual form? */`
134			`if (a->opt[1] != b->opt[1] \|\| a->op[1] != b->op[1]`
135			`\|\| a->opt[2] != OPT_CONST \|\| b->opt[2] != OPT_CONST) goto keep;`
136
137	997	markom	`//PRINTF ("%i %i, ", a->op[2], b->op[2]);`
138	953	markom
139			`/* Check if they are the same => do not copy */`
140			`if (a->op[2] == b->op[2]`
141			`&& REF_BB(f->msched[i - 1]) == REF_BB(f->msched[i])) {`
142			`/* yes => remove actual instruction */`
143			`int t1 = MIN (f->msched[i - 1], f->msched[i]);`
144			`int t2 = MAX (f->msched[i - 1], f->msched[i]);`
145			`int b, i, j;`
146			`cucdebug (2, "Removing %x_%x and using %x_%x instead.\n",`
147			`REF_BB(t2), REF_I(t2), REF_BB(t1), REF_I(t1));`
148			`change_insn_type (&f->INSN(t2), II_NOP);`
149			`modified = 1;`
150			`/* Update references */`
151			`for (b = 0; b < f->num_bb; b++)`
152			`for (i = 0; i < f->bb[b].ninsn; i++)`
153			`for (j = 0; j < MAX_OPERANDS; j++)`
154			`if (f->bb[b].insn[i].opt[j] & OPT_REF && f->bb[b].insn[i].op[j] == t2)`
155			`f->bb[b].insn[i].op[j] = t1;`
156
157			`} else goto keep;`
158			`} else goto keep;`
159			`} else {`
160			`keep:`
161			`f->msched[j] = f->msched[i];`
162			`f->mtype[j++] = f->mtype[i];`
163			`}`
164			`f->nmsched = j;`
165			`}`
166			`return modified;`
167			`}`
168
169			`/* Check if two consecutive lb[zs] can be joined into lhz and if`
170			`two consecutive lh[zs] can be joined into lwz */`
171			`static int join_transfers (cuc_func *f, int otype)`
172			`{`
173			`int i, j;`
174			`int modified = 0;`
175
176			`/* We can change width even with strong memory ordering */`
177			`if (otype == MO_WEAK \|\| otype == MO_NONE \|\| otype == MO_STRONG) {`
178			`for (i = 1, j = 1; i < f->nmsched; i++)`
179			`/* Exclude memory stores and different memory types */`
180			`if (f->mtype[i - 1] == f->mtype[i] && f->mtype[i] & MT_LOAD) {`
181			`cuc_insn *a = &f->INSN(f->msched[i - 1]);`
182			`cuc_insn *b = &f->INSN(f->msched[i]);`
183			`int aw = f->mtype[i - 1] & MT_WIDTH;`
184			`if ((a->opt[1] & OPT_REF) && f->INSN(a->op[1]).index == II_ADD`
185			`&&(b->opt[1] & OPT_REF) && f->INSN(b->op[1]).index == II_ADD) {`
186			`a = &f->INSN(a->op[1]);`
187			`b = &f->INSN(b->op[1]);`
188
189			`/* Not in usual form? */`
190			`if (a->opt[1] != b->opt[1] \|\| a->op[1] != b->op[1]`
191			`\|\| a->opt[2] != OPT_CONST \|\| b->opt[2] != OPT_CONST) goto keep;`
192
193			`/* Check if they touch together */`
194			`if (a->op[2] + aw == b->op[2]`
195			`&& REF_BB(f->msched[i - 1]) == REF_BB(f->msched[i])) {`
196			`/* yes => remove second instruction */`
197			`int t1 = MIN (f->msched[i - 1], f->msched[i]);`
198			`int t2 = MAX (f->msched[i - 1], f->msched[i]);`
199			`dep_list *t1dep = f->INSN(t1).dep;`
200			`int x, p;`
201			`cuc_insn *ii;`
202
203			`cucdebug (2, "Joining %x and %x.\n", t1, t2);`
204	954	markom	`if (cuc_debug >= 8) print_cuc_bb (f, "PREJT");`
205	953	markom	`change_insn_type (&f->INSN(t1), II_NOP);`
206			`change_insn_type (&f->INSN(t2), II_NOP);`
207			`/* We will reuse the memadd before the first load, and add some`
208			`custom code at the end */`
209			`insert_insns (f, t1, 10);`
210	954	markom	`if (cuc_debug > 8) print_cuc_bb (f, "PREJT2");`
211	953	markom
212			`/* Remove all dependencies to second access */`
213			`for (x = 0; x < f->num_bb; x++) {`
214			`int i;`
215			`for (i = 0; i < f->bb[x].ninsn; i++) {`
216			`dep_list *d = f->bb[x].insn[i].dep;`
217			`dep_list **old = &f->bb[x].insn[i].dep;`
218			`while (d) {`
219			`if (d->ref == t2) {`
220			`d = d->next;`
221			`*old = d;`
222			`} else {`
223			`d = d->next;`
224			`old = &((*old)->next);`
225			`}`
226			`}`
227			`}`
228			`}`
229
230			`/* Build the folowing code:`
231			`l[hw]z p-1`
232			`and p-1, 0xff`
233			`sfle p-1, 0x7f`
234			`or p-2, 0xffffff00`
235			`cmov p-3, p-1, p-2`
236			`shr p-5, 8`
237			`and p-1, 0xff`
238			`sfle p-1 0x7f`
239			`or p-2 0xffffff00`
240			`cmov p-3, p-1, p-2*/`
241			`p = REF_I(t1);`
242	954	markom	`cucdebug (8, "%x %x\n", f->mtype[i - 1], f->mtype[i]);`
243	953	markom	`for (x = 0; x < 2; x++) {`
244			`int t = f->mtype[i - 1 + x];`
245			`ii = &f->bb[REF_BB(t1)].insn[p];`
246			`if (!x) {`
247			`change_insn_type (ii, aw == 1 ? II_LH : II_LW);`
248			`ii->type = IT_MEMORY \| IT_VOLATILE;`
249			`ii->op[0] = -1; ii->opt[0] = OPT_REGISTER \| OPT_DEST;`
250			`ii->op[1] = t1 - 1; ii->opt[1] = OPT_REF;`
251			`ii->opt[2] = ii->opt[3] = OPT_NONE;`
252			`ii->dep = t1dep;`
253			`f->mtype[i - 1] = MT_LOAD \| (aw == 1 ? 2 : 4);`
254			`f->msched[i - 1] = REF (REF_BB(t1), p);`
255			`} else {`
256			`change_insn_type (ii, II_SRL);`
257			`ii->type = 0;`
258			`ii->op[0] = -1; ii->opt[0] = OPT_REGISTER \| OPT_DEST;`
259			`ii->op[1] = t1; ii->opt[1] = OPT_REF;`
260			`ii->op[2] = 8; ii->opt[2] = OPT_CONST;`
261			`ii->opt[3] = OPT_NONE;`
262			`}`
263
264			`ii = &f->bb[REF_BB(t1)].insn[++p];`
265			`change_insn_type (ii, II_AND);`
266			`ii->type = 0;`
267			`ii->op[0] = -1; ii->opt[0] = OPT_REGISTER \| OPT_DEST;`
268			`ii->op[1] = REF (REF_BB(t1), p - 1); ii->opt[1] = OPT_REF;`
269			`ii->op[2] = 0xff; ii->opt[2] = OPT_CONST;`
270			`ii->opt[3] = OPT_NONE;`
271
272			`ii = &f->bb[REF_BB(t1)].insn[++p];`
273			`change_insn_type (ii, II_SFLE);`
274			`ii->type = IT_COND;`
275			`ii->op[0] = -1; ii->opt[0] = OPT_REGISTER \| OPT_DEST;`
276			`ii->op[1] = REF (REF_BB(t1), p - 1); ii->opt[1] = OPT_REF;`
277			`ii->op[2] = 0x7f; ii->opt[2] = OPT_CONST;`
278			`ii->opt[3] = OPT_NONE;`
279
280			`ii = &f->bb[REF_BB(t1)].insn[++p];`
281			`change_insn_type (ii, II_OR);`
282			`ii->type = 0;`
283			`ii->op[0] = -1; ii->opt[0] = OPT_REGISTER \| OPT_DEST;`
284			`ii->op[1] = REF (REF_BB(t1), p - 2); ii->opt[1] = OPT_REF;`
285			`if (t & MT_SIGNED) ii->op[2] = 0xffffff00;`
286			`else ii->op[2] = 0;`
287			`ii->opt[2] = OPT_CONST;`
288			`ii->opt[3] = OPT_NONE;`
289
290			`ii = &f->bb[REF_BB(t1)].insn[++p];`
291			`change_insn_type (ii, II_CMOV);`
292			`ii->type = 0;`
293			`ii->op[0] = -1; ii->opt[0] = OPT_REGISTER \| OPT_DEST;`
294			`ii->op[1] = REF (REF_BB(t1), p - 1); ii->opt[1] = OPT_REF;`
295			`ii->op[2] = REF (REF_BB(t1), p - 3); ii->opt[2] = OPT_REF;`
296			`ii->op[3] = REF (REF_BB(t1), p - 2); ii->opt[3] = OPT_REF;`
297			`p++;`
298			`}`
299
300			`modified = 1;`
301
302			`{`
303			`int b, i, j;`
304			`/* Update references */`
305			`for (b = 0; b < f->num_bb; b++)`
306			`for (i = 0; i < f->bb[b].ninsn; i++)`
307			`for (j = 0; j < MAX_OPERANDS; j++)`
308			`if (REF_I (f->bb[b].insn[i].op[j]) < REF_I (t1)`
309			`\|\| REF_I(f->bb[b].insn[i].op[j]) >= REF_I (t1) + 10) {`
310			`if (f->bb[b].insn[i].opt[j] & OPT_REF && f->bb[b].insn[i].op[j] == t1)`
311			`f->bb[b].insn[i].op[j] = t1 + 4;`
312			`else if (f->bb[b].insn[i].opt[j] & OPT_REF && f->bb[b].insn[i].op[j] == t2)`
313			`f->bb[b].insn[i].op[j] = t1 + 9;`
314			`}`
315			`}`
316	954	markom	`if (cuc_debug >= 8) print_cuc_bb (f, "POSTJT");`
317	953	markom	`} else goto keep;`
318			`} else goto keep;`
319			`} else {`
320			`keep:`
321			`f->msched[j] = f->msched[i];`
322			`f->mtype[j++] = f->mtype[i];`
323			`}`
324			`f->nmsched = j;`
325			`}`
326			`return modified;`
327			`}`
328
329	879	markom	`/* returns nonzero if a < b */`
330			`int mem_ordering_cmp (cuc_func f, cuc_insn a, cuc_insn *b)`
331			`{`
332			`assert (a->type & IT_MEMORY);`
333			`assert (b->type & IT_MEMORY);`
334			`if ((a->opt[1] & OPT_REF) && f->INSN(a->op[1]).index == II_ADD`
335			`&&(b->opt[1] & OPT_REF) && f->INSN(b->op[1]).index == II_ADD) {`
336			`a = &f->INSN(a->op[1]);`
337			`b = &f->INSN(b->op[1]);`
338			`if (a->opt[1] != b->opt[1] \|\| a->op[1] != b->op[1]`
339			`\|\| a->opt[2] != OPT_CONST \|\| b->opt[2] != OPT_CONST) return 0;`
340
341			`/* Order linearly, we can then join them to bursts */`
342			`return a->op[2] < b->op[2];`
343			`} else return 0;`
344			`}`
345
346			`/* Schedule memory accesses`
347
348	953	markom	`int schedule_memory (cuc_func *f, int otype)`
349	879	markom	`{`
350			`int b, i, j;`
351	953	markom	`int modified = 0;`
352	879	markom	`f->nmsched = 0;`
353
354			`for (b = 0; b < f->num_bb; b++) {`
355			`cuc_insn *insn = f->bb[b].insn;`
356			`for (i = 0; i < f->bb[b].ninsn; i++)`
357			`if (insn[i].type & IT_MEMORY) {`
358			`f->msched[f->nmsched++] = REF (b, i);`
359	897	markom	`if (otype == MO_NONE \|\| otype == MO_WEAK) insn[i].type \|= IT_FLAG1; /* mark unscheduled */`
360	879	markom	`}`
361			`}`
362	937	markom
363	879	markom	`for (i = 0; i < f->nmsched; i++)`
364	937	markom	`cucdebug (2, "[%x]%x%c ", f->msched[i], f->mtype[i] & MT_WIDTH, (f->mtype[i] & MT_BURST) ? (f->mtype[i] & MT_BURSTE) ? 'E' : 'B' : ' ');`
365			`cucdebug (2, "\n");`
366
367	879	markom	`/* We can reorder just more loose types`
368			`We assume, that memory accesses are currently in valid (but not neccesserly)`
369			`optimal order */`
370	897	markom	`if (otype == MO_WEAK \|\| otype == MO_NONE) {`
371	879	markom	`for (i = 0; i < f->nmsched; i++) {`
372			`int best = i;`
373			`int tmp;`
374			`for (j = i + 1; j < f->nmsched; j++) if (REF_BB(f->msched[j]) == REF_BB(f->msched[best])) {`
375			`if (mem_ordering_cmp (f, &f->INSN (f->msched[j]), &f->INSN(f->msched[best]))) {`
376			`/* Check dependencies */`
377			`dep_list *t = f->INSN(f->msched[j]).dep;`
378			`while (t) {`
379			`if (f->INSN(t->ref).type & IT_FLAG1) break;`
380			`t = t->next;`
381			`}`
382			`if (!t) best = j; /* no conflicts -> ok */`
383			`}`
384			`}`
385
386			`/* we have to shift instructions up, to maintain valid dependencies`
387			`and make space for best candidate */`
388
389			`/* make local copy */`
390			`tmp = f->msched[best];`
391			`for (j = best; j > i; j--) f->msched[j] = f->msched[j - 1];`
392			`f->msched[i] = tmp;`
393			`f->INSN(f->msched[i]).type &= ~IT_FLAG1; /* mark scheduled */`
394			`}`
395			`}`
396
397			`for (i = 0; i < f->nmsched; i++)`
398	937	markom	`cucdebug (2, "[%x]%x%c ", f->msched[i], f->mtype[i] & MT_WIDTH, (f->mtype[i] & MT_BURST) ? (f->mtype[i] & MT_BURSTE) ? 'E' : 'B' : ' ');`
399			`cucdebug (2, "\n");`
400	879	markom
401	904	markom	`/* Assign memory types */`
402	879	markom	`for (i = 0; i < f->nmsched; i++) {`
403			`cuc_insn *a = &f->INSN(f->msched[i]);`
404	907	markom	`f->mtype[i] = !II_IS_LOAD(a->index) ? MT_STORE : MT_LOAD;`
405	879	markom	`f->mtype[i] \|= II_MEM_WIDTH (a->index);`
406			`if (a->type & IT_SIGNED) f->mtype[i] \|= MT_SIGNED;`
407			`}`
408
409	953	markom	`if (same_transfers (f, otype)) modified = 1;`
410			`if (join_transfers (f, otype)) modified = 1;`
411	904	markom
412	937	markom	`for (i = 0; i < f->nmsched; i++)`
413			`cucdebug (2, "[%x]%x%c ", f->msched[i], f->mtype[i] & MT_WIDTH, (f->mtype[i] & MT_BURST) ? (f->mtype[i] & MT_BURSTE) ? 'E' : 'B' : ' ');`
414			`cucdebug (2, "\n");`
415			`if (cuc_debug > 5) print_cuc_bb (f, "AFTER_MEM_REMOVAL");`
416
417	897	markom	`if (config.cuc.enable_bursts) {`
418	997	markom	`//PRINTF ("\n");`
419	879	markom	`for (i = 1; i < f->nmsched; i++) {`
420			`cuc_insn *a = &f->INSN(f->msched[i - 1]);`
421			`cuc_insn *b = &f->INSN(f->msched[i]);`
422			`int aw = f->mtype[i - 1] & MT_WIDTH;`
423
424	953	markom	`/* Burst can only be out of words */`
425			`if (aw != 4) continue;`
426
427	879	markom	`if ((a->opt[1] & OPT_REF) && f->INSN(a->op[1]).index == II_ADD`
428			`&&(b->opt[1] & OPT_REF) && f->INSN(b->op[1]).index == II_ADD) {`
429			`a = &f->INSN(a->op[1]);`
430			`b = &f->INSN(b->op[1]);`
431			`/* Not in usual form? */`
432			`if (a->opt[1] != b->opt[1] \|\| a->op[1] != b->op[1]`
433			`\|\| a->opt[2] != OPT_CONST \|\| b->opt[2] != OPT_CONST) continue;`
434
435	997	markom	`//PRINTF ("%i %i, ", a->op[2], b->op[2]);`
436	879	markom
437			`/* Check if they touch together */`
438	953	markom	`if (a->op[2] + aw == b->op[2]`
439			`&& REF_BB(f->msched[i - 1]) == REF_BB(f->msched[i])) {`
440	879	markom	`/* yes => do burst */`
441			`f->mtype[i - 1] &= ~MT_BURSTE;`
442			`f->mtype[i - 1] \|= MT_BURST;`
443			`f->mtype[i] \|= MT_BURST \| MT_BURSTE;`
444			`}`
445			`}`
446			`}`
447			`}`
448
449			`for (i = 0; i < f->nmsched; i++)`
450	937	markom	`cucdebug (2, "[%x]%x%c ", f->msched[i], f->mtype[i] & MT_WIDTH, (f->mtype[i] & MT_BURST) ? (f->mtype[i] & MT_BURSTE) ? 'E' : 'B' : ' ');`
451			`cucdebug (2, "\n");`
452	879	markom
453			`/* We don't need dependencies in non-memory instructions */`
454			`for (b = 0; b < f->num_bb; b++) {`
455			`cuc_insn *insn = f->bb[b].insn;`
456			`for (i = 0; i < f->bb[b].ninsn; i++) if (!(insn[i].type & IT_MEMORY))`
457			`dispose_list (&insn[i].dep);`
458			`}`
459
460	953	markom	`if (cuc_debug > 5) print_cuc_bb (f, "AFTER_MEM_REMOVAL2");`
461	879	markom	`/* Reduce number of dependecies, keeping just direct dependencies, based on memory schedule */`
462			`{`
463	907	markom	`int lastl[3] = {-1, -1, -1};`
464			`int lasts[3] = {-1, -1, -1};`
465			`int lastc[3] = {-1, -1, -1};`
466			`int last_load = -1, last_store = -1, last_call = -1;`
467	879	markom	`for (i = 0; i < f->nmsched; i++) {`
468	907	markom	`int t = f->mtype[i] & MT_LOAD ? 0 : f->mtype[i] & MT_STORE ? 1 : 2;`
469	879	markom	`int maxl = lastl[t];`
470			`int maxs = lasts[t];`
471	907	markom	`int maxc = lastc[t];`
472	879	markom	`dep_list *tmp = f->INSN(f->msched[i]).dep;`
473	1308	phoenix	`cucdebug (7, "!%i %x %p\n", i, f->msched[i], tmp);`
474	879	markom	`while (tmp) {`
475			`if (f->INSN(tmp->ref).type & IT_MEMORY && REF_BB(tmp->ref) == REF_BB(f->msched[i])) {`
476	1308	phoenix	`cucdebug (7, "%i %x %lx\n", i, f->msched[i], tmp->ref);`
477	879	markom	`/* Search for the reference */`
478			`for (j = 0; j < f->nmsched; j++) if (f->msched[j] == tmp->ref) break;`
479			`assert (j < f->nmsched);`
480	907	markom	`if (f->mtype[j] & MT_STORE) {`
481	879	markom	`if (maxs < j) maxs = j;`
482	907	markom	`} else if (f->mtype[j] & MT_LOAD) {`
483	879	markom	`if (maxl < j) maxl = j;`
484	907	markom	`} else if (f->mtype[j] & MT_CALL) {`
485			`if (maxc < j) maxc = j;`
486	879	markom	`}`
487			`}`
488			`tmp = tmp->next;`
489			`}`
490			`dispose_list (&f->INSN(f->msched[i]).dep);`
491	907	markom	`if (f->mtype[i] & MT_STORE) {`
492	879	markom	`maxs = last_store;`
493			`last_store = i;`
494	907	markom	`} else if (f->mtype[i] & MT_LOAD) {`
495	879	markom	`maxl = last_load;`
496			`last_load = i;`
497	907	markom	`} else if (f->mtype[i] & MT_CALL) {`
498			`maxc = last_call;`
499			`last_call = i;`
500	879	markom	`}`

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