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[/] [or1k/] [tags/] [stable_0_2_0_rc2/] [or1ksim/] [cuc/] [insn.c] - Blame information for rev 902

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1 879 markom 
/* insn.c -- OpenRISC Custom Unit Compiler, instruction support
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>
24 897 markom 
#include "sim-config.h"
25 879 markom 
#include "cuc.h"
26 
#include "insn.h"
27 
 
28 
/* Table of known instructions.  Watch out for indexes I_*! */
29 
const cuc_known_insn known[II_LAST + 1] = {
30 
{"add", 1, "assign \1 = \2 + \3;"},
31 
{"sub", 0, "assign \1 = \2 - \3;"},
32 
{"and", 1, "assign \1 = \2 & \3;"},
33 
{"or",  1, "assign \1 = \2 | \3;"},
34 
{"xor", 1, "assign \1 = \2 ^ \3;"},
35 
{"mul", 1, "assign \1 = \2 * \3;"},
36 
 
37 
{"srl", 0, "assign \1 = \2 >> \3;"},
38 
{"sll", 0, "assign \1 = \2 << \3;"},
39 
{"sra", 0, "assign \1 = ({32{\2[31]}} << (6'd32-{1'b0, \3}))\n\
40 
                 | \2 >> \3;"},
41 
 
42 
{"lb",  0, "always @(posedge clk or posedge rst)"},
43 
{"lh",  0, "always @(posedge clk or posedge rst)"},
44 
{"lw",  0, "always @(posedge clk or posedge rst)"},
45 
{"sb",  0, "/* mem8[\2] = \1 */"},
46 
{"sh",  0, "/* mem16[\2] = \1 */"},
47 
{"sw",  0, "/* mem32[\2] = \1 */"},
48 
 
49 
{"sfeq", 1, "assign \1 = \2 == \3;"},
50 
{"sfne", 1, "assign \1 = \2 != \3;"},
51 
{"sfle", 0, "assign \1 = \2 <= \3;"},
52 
{"sflt", 0, "assign \1 = \2 < \3;"},
53 
{"sfgt", 0, "assign \1 = \2 > \3;"},
54 
{"sfge", 0, "assign \1 = \2 >= \3;"},
55 
{"sfor", 1, "assign \1 = \2 || \3;"},
56 
{"bf",  0, ""},
57 
 
58 
{"lrbb", 0,"always @(posedge clk or posedge rst)"},
59 
{"cmov", 0,"assign \1 = \4 ? \2 : \3;"},
60 
{"reg", 0, "always @(posedge clk or posedge rst)"},
61 
 
62 
{"nop", 0, NULL}};
63 
 
64 
/* Find known instruction and attach them to insn */
65 
void change_insn_type (cuc_insn *i, int index)
66 
{
67 
  int j;
68 
  assert (index >= 0 && index <= II_LAST);
69 
  i->index = index;
70 
  if (i->index == II_NOP) {
71 
    for (j = 0; j < MAX_OPERANDS; j++) i->opt[j] = OPT_NONE;
72 
    i->type = 0;
73 
    i->dep = NULL;
74 
  }
75 
}
76 
 
77 
/* Returns instruction name */
78 
const char *cuc_insn_name (cuc_insn *ii) {
79 
  if (ii->index < 0 || ii->index > II_LAST) return "???";
80 
  else return known[ii->index].name;
81 
}
82 883 markom 
 
83 897 markom 
/* Prints out instructions */
84 
void print_insns (cuc_insn *insn, int ninsn, int verbose)
85 
{
86 
  int i, j;
87 
  for (i = 0; i < ninsn; i++) {
88 
    dep_list *l = insn[i].dep;
89 
    printf ("%4x%c %-4s ", i, insn[i].index >= 0 ? ':' : '?', cuc_insn_name (&insn[i]));
90 
    if (verbose) {
91 
      printf ("%-20s insn = %08x, index = %i, type = %04x ",
92 
                      insn[i].disasm, insn[i].insn, insn[i].index, insn[i].type);
93 
    } else printf ("type = %04x ", insn[i].type);
94 
    for (j = 0; j < MAX_OPERANDS; j++) {
95 
      if (insn[i].opt[j] & OPT_DEST) printf ("*");
96 
      switch (insn[i].opt[j] & ~OPT_DEST) {
97 
        case OPT_NONE: break;
98 
        case OPT_CONST: printf ("0x%08x, ", insn[i].op[j]); break;
99 
        case OPT_JUMP: printf ("J%x ", insn[i].op[j]); break;
100 
        case OPT_REGISTER: printf ("r%i, ", insn[i].op[j]); break;
101 
        case OPT_REF: printf ("[%x.%x], ", REF_BB(insn[i].op[j]), REF_I(insn[i].op[j])); break;
102 
        case OPT_BB: printf ("BB%x, ", insn[i].op[j]); break;
103 
        case OPT_LRBB: printf ("LRBB, "); break;
104 
        default:
105 
          fprintf (stderr, "Invalid operand type %s(%x.%x) = %x\n",
106 
                         cuc_insn_name (&insn[i]), i, j, insn[i].opt[j]);
107 
          assert (0);
108 
      }
109 
    }
110 
    if (l) {
111 
      printf ("\n\tdep:");
112 
      while (l) {
113 
        printf (" [%x.%x],", REF_BB (l->ref), REF_I (l->ref));
114 
        l = l->next;
115 
      }
116 
    }
117 
    printf ("\n");
118 
  }
119 
}
120 
 
121 
void add_dep (dep_list **list, int dep)
122 
{
123 
  dep_list *ndep;
124 
  dep_list **tmp = list;
125 
 
126 
  while (*tmp) {
127 
    if ((*tmp)->ref == dep) return; /* already there */
128 
    tmp = &((*tmp)->next);
129 
  }
130 
  ndep = (dep_list *)malloc (sizeof (dep_list));
131 
  ndep->ref = dep;
132 
  ndep->next = NULL;
133 
  *tmp = ndep;
134 
}
135 
 
136 
void dispose_list (dep_list **list)
137 
{
138 
  while (*list) {
139 
    dep_list *tmp = *list;
140 
    *list = tmp->next;
141 
    free (tmp);
142 
  }
143 
}
144 
 
145 
void add_data_dep (cuc_func *f)
146 
{
147 
  int b, i, j;
148 
  dep_list *tmp;
149 
  for (b = 0; b < f->num_bb; b++) {
150 
    cuc_insn *insn = f->bb[b].insn;
151 
    for (i = 0; i < f->bb[b].ninsn; i++)
152 
      for (j = 0; j < MAX_OPERANDS; j++) {
153 
        fflush (stdout);
154 
        if (insn[i].opt[j] & OPT_REF) {
155 
          /* Copy list from predecessor */
156 
          dep_list *l = f->INSN(insn[i].op[j]).dep;
157 
          while (l) {
158 
            add_dep (&insn[i].dep, l->ref);
159 
            l = l->next;
160 
          }
161 
          /* add predecessor */
162 
          add_dep (&insn[i].dep, insn[i].op[j]);
163 
        }
164 
      }
165 
  }
166 
}
167 
 
168 
/* returns nonzero, if instruction was simplified */
169 
int apply_edge_condition (cuc_insn *ii)
170 
{
171 
  unsigned int c = ii->op[2];
172 
 
173 
  if (ii->index == II_AND) {
174 
    if (ii->opt[2] & OPT_CONST && c == 0) {
175 
      change_insn_type (ii, II_ADD);
176 
      ii->op[1] = 0; ii->opt[1] = OPT_CONST;
177 
      ii->op[2] = 0; ii->opt[2] = OPT_CONST;
178 
      return 1;
179 
    }
180 
  } else if (ii->index == II_OR) {
181 
    if (ii->opt[2] & OPT_CONST && c == 0xffffffff) {
182 
      change_insn_type (ii, II_ADD);
183 
      ii->op[1] = c; ii->opt[1] = OPT_CONST;
184 
      ii->op[2] = 0; ii->opt[2] = OPT_CONST;
185 
      return 1;
186 
    }
187 
  } else if (ii->index == II_SUB) {
188 
    if (ii->opt[1] == ii->opt[2] && ii->op[1] == ii->op[2]) {
189 
      change_insn_type (ii, II_ADD);
190 
      ii->op[1] = 0; ii->opt[1] = OPT_CONST;
191 
      ii->op[2] = 0; ii->opt[2] = OPT_CONST;
192 
      return 1;
193 
    }
194 
  } else if (ii->index == II_MUL) {
195 
    if (ii->opt[2] & OPT_CONST && c == 0) {
196 
      change_insn_type (ii, II_ADD);
197 
      ii->op[1] = 0; ii->opt[1] = OPT_CONST;
198 
      ii->op[2] = 0; ii->opt[2] = OPT_CONST;
199 
      return 1;
200 
    } else
201 
    if (ii->opt[2] & OPT_CONST && c == 1) {
202 
      change_insn_type (ii, II_ADD);
203 
      ii->op[1] = c; ii->opt[1] = OPT_CONST;
204 
      ii->op[2] = 0; ii->opt[2] = OPT_CONST;
205 
      return 1;
206 
    } else
207 
    if (ii->opt[2] & OPT_CONST && c == 0xffffffff) {
208 
      change_insn_type (ii, II_SUB);
209 
      ii->op[2] = ii->op[1]; ii->opt[2] = ii->opt[1];
210 
      ii->op[1] = 0; ii->opt[1] = OPT_CONST;
211 
      return 1;
212 
    }
213 
  } else if (ii->index == II_SRL) {
214 
    if (ii->opt[2] & OPT_CONST && c == 0) {
215 
      change_insn_type (ii, II_ADD);
216 
      ii->op[1] = c; ii->opt[1] = OPT_CONST;
217 
      ii->op[2] = 0; ii->opt[2] = OPT_CONST;
218 
      return 1;
219 
    } else if (ii->opt[2] & OPT_CONST && c >= 32) {
220 
      change_insn_type (ii, II_ADD);
221 
      ii->op[1] = 0; ii->opt[1] = OPT_CONST;
222 
      ii->op[2] = 0; ii->opt[2] = OPT_CONST;
223 
      return 1;
224 
    }
225 
  } else if (ii->index == II_SLL) {
226 
    if (ii->opt[2] & OPT_CONST && c == 0) {
227 
      change_insn_type (ii, II_ADD);
228 
      ii->op[1] = c; ii->opt[1] = OPT_CONST;
229 
      ii->op[2] = 0; ii->opt[2] = OPT_CONST;
230 
      return 1;
231 
    } else if (ii->opt[2] & OPT_CONST && c >= 32) {
232 
      change_insn_type (ii, II_ADD);
233 
      ii->op[1] = 0; ii->opt[1] = OPT_CONST;
234 
      ii->op[2] = 0; ii->opt[2] = OPT_CONST;
235 
      return 1;
236 
    }
237 
  } else if (ii->index == II_SRA) {
238 
    if (ii->opt[2] & OPT_CONST && c == 0) {
239 
      change_insn_type (ii, II_ADD);
240 
      ii->op[1] = c; ii->opt[1] = OPT_CONST;
241 
      ii->op[2] = 0; ii->opt[2] = OPT_CONST;
242 
      return 1;
243 
    }
244 
  } else if (ii->index == II_CMOV) {
245 
    if (ii->opt[1] == ii->opt[2] && ii->op[1] == ii->op[2]) {
246 
      change_insn_type (ii, II_ADD);
247 
      ii->op[2] = 0; ii->opt[2] = OPT_CONST;
248 
      ii->opt[3] = OPT_NONE;
249 
      return 1;
250 
    }
251 
  }
252 
  return 0;
253 
}
254 
 
255 902 markom 
/* First primary input */
256 
static unsigned long tmp_op, tmp_opt;
257 
 
258 
/* Recursive function that searches for primary inputs;
259 
   returns 0 if cmov can be replaced by add */
260 
static int cmov_needed (cuc_func *f, int ref)
261 
{
262 
  cuc_insn *ii = &f->INSN(ref);
263 
  int j;
264 
 
265 
  //printf (" %x", ref);
266 
  /* mark visited, if already marked, we have a loop, ignore */
267 
  if (ii->tmp) return 0;
268 
  ii->tmp = 1;
269 
 
270 
  /* handle normal movs separately */
271 
  if ((ii->index == II_ADD || !(ii->type & IT_VOLATILE))
272 
    && ii->opt[2] == OPT_CONST && ii->op[2] == 0) {
273 
    if (ii->opt[1] == OPT_REF) {
274 
      if (cmov_needed (f, ii->op[1])) {
275 
        ii->tmp = 0;
276 
        return 1;
277 
      }
278 
    } else {
279 
      if (tmp_opt == OPT_NONE) {
280 
        tmp_op = ii->op[1];
281 
        tmp_opt = ii->opt[1];
282 
      } else if (tmp_opt != ii->opt[1] || tmp_op != ii->op[1]) {
283 
        ii->tmp = 0;
284 
        return 1;
285 
      }
286 
    }
287 
    ii->tmp = 0;
288 
    return 0;
289 
  }
290 
 
291 
  /* Is this instruction CMOV? no => add to primary inputs */
292 
  if (ii->index != II_CMOV || ii->type & IT_VOLATILE)
293 
    if (tmp_opt == OPT_NONE) {
294 
      tmp_op = ref;
295 
      tmp_opt = OPT_REF;
296 
      ii->tmp = 0;
297 
      return 0;
298 
    } else if (tmp_opt != OPT_REF || tmp_op != ref) {
299 
      ii->tmp = 0;
300 
      return 1;
301 
    }
302 
 
303 
  for (j = 1; j < 3; j++) {
304 
    //printf ("(%x:%i)", ref, j);
305 
    if (ii->opt[j] == OPT_REF) {
306 
      if (cmov_needed (f, ii->op[j])) {
307 
        ii->tmp = 0;
308 
        return 1;
309 
      }
310 
    } else {
311 
      if (tmp_opt == OPT_NONE) {
312 
        tmp_op = ii->op[j];
313 
        tmp_opt = ii->opt[j];
314 
      } else if (tmp_opt != ii->opt[j] || tmp_op != ii->op[j]) {
315 
        ii->tmp = 0;
316 
        return 1;
317 
      }
318 
    }
319 
  }
320 
 
321 
  ii->tmp = 0;
322 
  return 0;
323 
}
324 
 
325 
/* Search and optimize complex cmov assignments */
326 
void optimize_cmovs (cuc_func *f)
327 
{
328 
  int b, i, j;
329 
 
330 
  /* Mark all instructions unvisited */
331 
  for (b = 0; b < f->num_bb; b++) if (!(f->bb[b].type & BB_DEAD))
332 
    for (i = 0; i < f->bb[b].ninsn; i++) f->bb[b].insn[i].tmp = 0;
333 
 
334 
  for (b = 0; b < f->num_bb; b++) if (!(f->bb[b].type & BB_DEAD)) {
335 
    for (i = 0; i < f->bb[b].ninsn; i++) {
336 
      cuc_insn *ii = &f->bb[b].insn[i];
337 
      if (ii->index == II_CMOV && !(ii->type & IT_VOLATILE)) {
338 
        tmp_opt = OPT_NONE;
339 
        printf ("\n");
340 
        if (!cmov_needed (f, REF(b, i))) {
341 
          assert (tmp_opt != OPT_NONE);
342 
          change_insn_type (ii, II_ADD);
343 
          ii->op[1] = tmp_op; ii->opt[1] = tmp_opt;
344 
          ii->op[2] = 0; ii->opt[2] = OPT_CONST;
345 
          ii->opt[3] = OPT_NONE;
346 
        }
347 
      }
348 
    }
349 
  }
350 
}
351 
 
352 897 markom 
/* Optimizes dataflow tree */
353 
void optimize_tree (cuc_func *f)
354 
{
355 
  int b, i, j;
356 
  int modified;
357 
 
358 
  do {
359 
    modified = 0;
360 
    for (b = 0; b < f->num_bb; b++) if (!(f->bb[b].type & BB_DEAD)) {
361 
      for (i = 0; i < f->bb[b].ninsn; i++) {
362 
        cuc_insn *ii = &f->bb[b].insn[i];
363 
        /* We tend to have the third parameter const if instruction is cumutative */
364 
        if ((ii->opt[1] & OPT_CONST) && !(ii->opt[2] & OPT_CONST)
365 
            && known[ii->index].comutative) {
366 
          unsigned long t = ii->opt[1];
367 
          ii->opt[1] = ii->opt[2];
368 
          ii->opt[2] = t;
369 
          t = ii->op[1];
370 
          ii->op[1] = ii->op[2];
371 
          ii->op[2] = t;
372 
          modified = 1; cucdebug (2, "%08x:<>\n", REF(b, i));
373 
        }
374 
 
375 
        /* Try to do the promotion */
376 
        /* We have two consecutive expressions, containing constants,
377 
         * if previous is a simple expression we can handle it simply: */
378 
        for (j = 0; j < MAX_OPERANDS; j++)
379 
          if (ii->opt[j] & OPT_REF) {
380 
            cuc_insn *t = &f->INSN(ii->op[j]);
381 
            if (f->INSN(ii->op[j]).index == II_ADD
382 
             && f->INSN(ii->op[j]).opt[2] & OPT_CONST
383 
             && f->INSN(ii->op[j]).op[2] == 0
384 
             && !(ii->type & IT_MEMORY && t->type & IT_MEMADD)
385 
             && !(ii->type & IT_BRANCH) && !(t->type & IT_COND)) {
386 
            /* do not promote through add-mem, and branches */
387 
              modified = 1; cucdebug (2, "%8x:promote%i %8x %8x\n", REF (b, i), j, ii->op[j], t->op[1]);
388 
              ii->op[j] = t->op[1]; ii->opt[j] = t->opt[1];
389 
            }
390 
          }
391 
 
392 
        /* In case of x = cmov x, y; or x = cmov y, x; we have
393 
           asynchroneous loop -> remove it */
394 
        if (ii->index == II_CMOV) {
395 
          int f = 0;
396 
          if ((ii->opt[1] & OPT_REF) && ii->op[1] == REF (b, i)) f = 1;
397 
          if ((ii->opt[2] & OPT_REF) && ii->op[2] == REF (b, i)) f = 2;
398 
          if (ii->opt[1] == ii->opt[2] && ii->op[1] == ii->op[2]) f = 2;
399 
          if (f) {
400 
            change_insn_type (ii, II_ADD);
401 
            cucdebug (2, "%8x:cmov     %i\n", REF(b, i), f);
402 
            ii->opt[f] = OPT_CONST;
403 
            ii->op[f] = 0;
404 
            ii->opt[3] = OPT_NONE;
405 
            modified = 1;
406 
            continue;
407 
          }
408 
        }
409 
 
410 
        /* Do nothing to volatile instructions */
411 
        if (ii->type & IT_VOLATILE) continue;
412 
 
413 
        /* Check whether we can simplify the instruction */
414 
        if (apply_edge_condition (ii)) {
415 
          modified = 1;
416 
          continue;
417 
        }
418 
        /* We cannot do anything more if at least one is not constant */
419 
        if (!(ii->opt[2] & OPT_CONST)) continue;
420 
 
421 
        if (ii->opt[1] & OPT_CONST) { /* We have constant expression */
422 
          unsigned long value;
423 
          int ok = 1;
424 
          /* Was constant expression already? */
425 
          if (ii->index == II_ADD && !ii->op[2]) continue;
426 
 
427 
          if (ii->index == II_ADD) value = ii->op[1] + ii->op[2];
428 
          else if (ii->index == II_SUB) value = ii->op[1] - ii->op[2];
429 
          else if (ii->index == II_SLL) value = ii->op[1] << ii->op[2];
430 
          else if (ii->index == II_SRL) value = ii->op[1] >> ii->op[2];
431 
          else if (ii->index == II_MUL) value = ii->op[1] * ii->op[2];
432 
          else if (ii->index == II_OR) value = ii->op[1] | ii->op[2];
433 
          else if (ii->index == II_XOR) value = ii->op[1] ^ ii->op[2];
434 
          else if (ii->index == II_AND) value = ii->op[1] & ii->op[2];
435 
          else ok = 0;
436 
          if (ok) {
437 
            change_insn_type (ii, II_ADD);
438 
            ii->op[0] = -1; ii->opt[0] = OPT_REGISTER | OPT_DEST;
439 
            ii->op[1] = value; ii->opt[1] = OPT_CONST;
440 
            ii->op[2] = 0; ii->opt[2] = OPT_CONST;
441 
            modified = 1; cucdebug (2, "%8x:const\n", REF (b, i));
442 
          }
443 
        } else if (ii->opt[1] & OPT_REF) {
444 
          cuc_insn *prev = &f->INSN(ii->op[1]);
445 
          /* Is this just a link? */
446 
          if (ii->index == II_ADD
447 
           && !(ii->type & IT_MEMADD) && ii->op[2] == 0) {
448 
            int b1, i1, j1;
449 
            cucdebug (2, "%8x:link      %8x: ", REF(b, i), ii->op[1]);
450 
            for (b1 = 0; b1 < f->num_bb; b1++) if (!(f->bb[b1].type & BB_DEAD))
451 
              for (i1 = 0; i1 < f->bb[b1].ninsn; i1++)
452 
                for (j1 = 0; j1 < MAX_OPERANDS; j1++)
453 
                  if ((f->bb[b1].insn[i1].opt[j1] & OPT_REF)
454 
                   && f->bb[b1].insn[i1].op[j1] == REF(b, i)) {
455 
                    cucdebug (2, "%x ", REF (b1, i1));
456 
                    f->bb[b1].insn[i1].op[j1] = ii->op[1];
457 
                  }
458 
            cucdebug (2, "\n");
459 
            change_insn_type (ii, II_NOP);
460 
          } else if (prev->opt[2] & OPT_CONST) {
461 
            /* Handle some common cases */
462 
            /* add - add joining */
463 
            if (ii->index == II_ADD && prev->index == II_ADD) {
464 
              ii->op[1] = prev->op[1]; ii->opt[1] = prev->opt[1];
465 
              ii->op[2] += prev->op[2];
466 
              modified = 1; cucdebug (2, "%8x: add-add\n", REF(b, i));
467 
            } else /* add - sub joining */
468 
            if (ii->index == II_ADD && prev->index == II_SUB) {
469 
              change_insn_type (&insn[i], II_SUB);
470 
              ii->op[1] = prev->op[1]; ii->opt[1] = prev->opt[1];
471 
              ii->op[2] += prev->op[2];
472 
              modified = 1; cucdebug (2, "%8x: add-sub\n", REF(b, i));
473 
            } else /* sub - add joining */
474 
            if (ii->index == II_SUB && prev->index == II_ADD) {
475 
              ii->op[1] = prev->op[1]; ii->opt[1] = prev->opt[1];
476 
              ii->op[2] += prev->op[2];
477 
              modified = 1; cucdebug (2, "%8x: sub-add\n", REF(b, i));
478 
            }
479 
          }
480 
        }
481 
      }
482 
    }
483 
  } while (modified);
484 
}
485 
 
486 
/* Remove nop instructions */
487 
void remove_nops (cuc_func *f)
488 
{
489 
  int b;
490 
  for (b = 0; b < f->num_bb; b++) {
491 
    int c, d = 0, i, j;
492 
    cuc_insn *insn = f->bb[b].insn;
493 
    for (i = 0; i < f->bb[b].ninsn; i++)
494 
      if (insn[i].index != II_NOP) {
495 
        reloc [i] = d;
496 
        insn[d++] = insn[i];
497 
      } else {
498 
        reloc[i] = d; /* For jumps only */
499 
      }
500 
    f->bb[b].ninsn = d;
501 
 
502 
    /* Relocate references from all basic blocks */
503 
    for (c = 0; c < f->num_bb; c++)
504 
      for (i = 0; i < f->bb[c].ninsn; i++) {
505 
        dep_list *d = f->bb[c].insn[i].dep;
506 
        for (j = 0; j < MAX_OPERANDS; j++)
507 
          if ((f->bb[c].insn[i].opt[j] & OPT_REF)
508 
            && REF_BB(f->bb[c].insn[i].op[j]) == b)
509 
            f->bb[c].insn[i].op[j] = REF (b, reloc[REF_I (f->bb[c].insn[i].op[j])]);
510 
 
511 
        while (d) {
512 
          if (REF_BB(d->ref) == b) d->ref = REF (b, reloc[REF_I (d->ref)]);
513 
          d = d->next;
514 
        }
515 
      }
516 
  }
517 
}
518 
 
519 
/* Remove unused assignments */
520 
void remove_dead (cuc_func *f)
521 
{
522 
  int b, i, j;
523 
  for (b = 0; b < f->num_bb; b++)
524 
    for (i = 0; i < f->bb[b].ninsn; i++)
525 
      if (!(f->bb[b].insn[i].type & (IT_VOLATILE | IT_OUTPUT)))
526 
        f->bb[b].insn[i].type |= IT_UNUSED;
527 
 
528 
  for (b = 0; b < f->num_bb; b++) {
529 
    for (i = 0; i < f->bb[b].ninsn; i++)
530 
      for (j = 0; j < MAX_OPERANDS; j++)
531 
        if (f->bb[b].insn[i].opt[j] & OPT_REF) {
532 
          f->INSN(f->bb[b].insn[i].op[j]).type &= ~IT_UNUSED;
533 
        }
534 
  }
535 
 
536 
  for (b = 0; b < f->num_bb; b++)
537 
    for (i = 0; i < f->bb[b].ninsn; i++)
538 
      if (f->bb[b].insn[i].type & IT_UNUSED) {
539 
        change_insn_type (&f->bb[b].insn[i], II_NOP);
540 
      }
541 
 
542 
  remove_nops (f);
543 
}
544 
 
545 
/* Removes trivial register assignments */
546 
void remove_trivial_regs (cuc_func *f)
547 
{
548 
  int b, i;
549 
  for (i = 0; i < MAX_REGS; i++) f->saved_regs[i] = call_saved[i];
550 
 
551 
  for (b = 0; b < f->num_bb; b++) {
552 
    cuc_insn *insn = f->bb[b].insn;
553 
    for (i = 0; i < f->bb[b].ninsn; i++) {
554 
      if (insn[i].index == II_ADD
555 
        && insn[i].opt[0] & OPT_REGISTER
556 
        && insn[i].opt[1] & OPT_REGISTER && insn[i].op[0] == insn[i].op[1]
557 
        && insn[i].opt[2] & OPT_CONST && insn[i].op[2] == 0) {
558 
          if (insn[i].type & IT_OUTPUT) f->saved_regs[insn[i].op[0]] = 1;
559 
          change_insn_type (&insn[i], II_NOP);
560 
        }
561 
    }
562 
  }
563 
  if (cuc_debug >= 2) {
564 
    printf ("saved regs ");
565 
    for (i = 0; i < MAX_REGS; i++) printf ("%i:%i ", i, f->saved_regs[i]);
566 
    printf ("\n");
567 
  }
568 
  remove_nops (f);
569 
}
570 
 
571 
/* Determine inputs and outputs */
572 
void set_io (cuc_func *f)
573 
{
574 
  int b, i, j;
575 
  /* Determine register usage */
576 
  for (i = 0; i < MAX_REGS; i++) {
577 
    f->lur[i] = -1;
578 
    f->used_regs[i] = 0;
579 
  }
580 902 markom 
  if (cuc_debug > 5) print_cuc_bb (f, "SET_IO");
581 897 markom 
  for (b = 0; b < f->num_bb; b++) {
582 
    for (i = 0; i < f->bb[b].ninsn; i++)
583 
      for (j = 0; j < MAX_OPERANDS; j++)
584 
        if (f->bb[b].insn[i].opt[j] & OPT_REGISTER && f->bb[b].insn[i].op[j] >= 0)
585 
          if (f->bb[b].insn[i].opt[j] & OPT_DEST) f->lur[f->bb[b].insn[i].op[j]] = REF (b, i);
586 
          else f->used_regs[f->bb[b].insn[i].op[j]] = 1;
587 
  }
588 
}
589 
 
590 
/* relocate all accesses inside of BB b to back/fwd */
591 
static void relocate_bb (cuc_bb *bb, int b, int back, int fwd)
592 
{
593 
  int i, j;
594 
  for (i = 0; i < bb->ninsn; i++)
595 
    for (j = 0; j < MAX_OPERANDS; j++)
596 
      if (bb->insn[i].opt[j] & OPT_REF
597 
       && REF_BB (bb->insn[i].op[j]) == b) {
598 
        int t = REF_I (bb->insn[i].op[j]);
599 
        if (t < i) bb->insn[i].op[j] = REF (back, t);
600 
        else bb->insn[i].op[j] = REF (fwd, t);
601 
      }
602 
}
603 
 
604 
/* Latch outputs in loops */
605 
void add_latches (cuc_func *f)
606 
{
607 
  int b, i, j;
608 
 
609 
  //print_cuc_bb (f, "ADD_LATCHES a");
610 
  /* Cuts the tree and marks registers */
611 
  mark_cut (f);
612 
 
613 
  /* Split BBs with more than one group */
614 
  for (b = 0; b < f->num_bb; b++) expand_bb (f, b);
615 
  remove_nops (f);
616 
  //print_cuc_bb (f, "ADD_LATCHES 0");
617 
 
618 
  /* Convert accesses in BB_INLOOP type block to latched */
619 
  for (b = 0; b < f->num_bb; b++) {
620 
    int j;
621 
    for (i = 0; i < f->bb[b].ninsn; i++)
622 
      for (j = 0; j < MAX_OPERANDS; j++) if (f->bb[b].insn[i].opt[j] == OPT_REF) {
623 
        int t = f->bb[b].insn[i].op[j];
624 
        /* If we are pointing to a INLOOP block from outside, or forward
625 
           (= previous loop iteration) we must register that data */
626 
        if ((f->bb[REF_BB(t)].type & BB_INLOOP || config.cuc.no_multicycle)
627 
         && !(f->INSN(t).type & (IT_BRANCH | IT_COND))
628 
         && (REF_BB(t) != b || REF_I(t) >= i)) {
629 
          f->INSN(t).type |= IT_LATCHED;
630 
        }
631 
      }
632 
  }
633 
  //print_cuc_bb (f, "ADD_LATCHES 1");
634 
 
635 
  /* Add latches at the end of blocks as needed */
636 
  for (b = 0; b < f->num_bb; b++) {
637 
    int nreg = 0;
638 
    cuc_insn *insn;
639 
    for (i = 0; i < f->bb[b].ninsn; i++)
640 
      if (f->bb[b].insn[i].type & IT_LATCHED) nreg++;
641 
    if (nreg) {
642 
      insn = (cuc_insn *) malloc (sizeof (cuc_insn) * (f->bb[b].ninsn + nreg));
643 
      j = 0;
644 
      for (i = 0; i < f->bb[b].ninsn; i++) {
645 
        insn[i] = f->bb[b].insn[i];
646 
        if (insn[i].type & IT_LATCHED) {
647 
          cuc_insn *ii = &insn[f->bb[b].ninsn + j++];
648 
          change_insn_type (ii, II_REG);
649 
          ii->op[0] = -1; ii->opt[0] = OPT_DEST | OPT_REGISTER;
650 
          ii->op[1] = REF (b, i); ii->opt[1] = OPT_REF;
651 
          ii->opt[2] = ii->opt[3] = OPT_NONE;
652 
          ii->dep = NULL;
653 
          ii->type = IT_VOLATILE;
654 
          sprintf (ii->disasm, "reg %i_%i", b, i);
655 
        }
656 
      }
657 
      f->bb[b].ninsn += nreg;
658 
      free (f->bb[b].insn);
659 
      f->bb[b].insn = insn;
660 
    }
661 
  }
662 
  //print_cuc_bb (f, "ADD_LATCHES 2");
663 
 
664 
  /* Repair references */
665 
  for (b = 0; b < f->num_bb; b++)
666 
    for (i = 0; i < f->bb[b].ninsn; i++)
667 
      for (j = 0; j < MAX_OPERANDS; j++)
668 
        /* If destination instruction is latched, use register instead */
669 
        if (f->bb[b].insn[i].opt[j] == OPT_REF
670 
         && f->INSN(f->bb[b].insn[i].op[j]).type & IT_LATCHED) {
671 
          int b1, i1;
672 
          b1 = REF_BB (f->bb[b].insn[i].op[j]);
673 
          //cucdebug (2, "%i.%i.%i %x\n", b, i, j, f->bb[b].insn[i].op[j]);
674 
          if (b1 != b || REF_I(f->bb[b].insn[i].op[j]) >= i) {
675 
            for (i1 = f->bb[b1].ninsn - 1; i1 >= 0; i1--) {
676 
              assert (f->bb[b1].insn[i1].index == II_REG);
677 
              if (f->bb[b1].insn[i1].op[1] == f->bb[b].insn[i].op[j]) {
678 
                f->bb[b].insn[i].op[j] = REF (b1, i1);
679 
                break;
680 
              }
681 
            }
682 
          }
683 
        }
684 
}
685 
 
686 883 markom 
/* CSE -- common subexpression elimination */
687 
void cse (cuc_func *f)
688 
{
689 
  int b, i, j, b1, i1, b2, i2, j2;
690 
  for (b1 = 0; b1 < f->num_bb; b1++)
691 
    for (i1 = 0; i1 < f->bb[b1].ninsn; i1++)
692 
      for (b2 = 0; b2 < f->num_bb; b2++)
693 
        for (i2 = 0; i2 < f->bb[b2].ninsn; i2++) {
694 
          cuc_insn *ii1 = &f->bb[b1].insn[i1];
695 
          cuc_insn *ii2 = &f->bb[b2].insn[i2];
696 
 
697 
          /* Do we have an exact match? */
698 
          if (ii1->index == ii2->index) continue;
699 
          if (ii1->type & IT_VOLATILE) continue;
700 
 
701 
          if (ii1->op[1] != ii2->op[1] || ii1->opt[1] != ii2->opt[1]) continue;
702 
          if (ii1->op[2] != ii2->op[2] || ii1->opt[2] != ii2->opt[2]) continue;
703 
          if (ii1->opt[3] != ii2->opt[3]) continue;
704 
          if (ii1->opt[3] != OPT_NONE && ii1->op[3] != ii2->op[3]) continue;
705 
 
706 
          /* Check if we drive outputs? */
707 
          if ((ii1->opt[0] & OPT_REGISTER) && ii1->op[0] >= 0)
708 
            if ((ii2->opt[0] & OPT_REGISTER) && ii2->op[0] >= 0) continue;
709 
            else ii2->op[0] = ii1->op[0];
710 
 
711 
          /* remove duplicated instruction and relink the references */
712 
          change_insn_type (ii2, II_NOP);
713 
          for (b = 0; b < f->num_bb; b++)
714 
            for (i = 0; i < f->bb[b].ninsn; i++)
715 
              for (j = 0; j < MAX_OPERANDS; j++)
716 
                if (f->bb[b].insn[i].opt[j] & OPT_REF && f->bb[b].insn[i].op[j] == REF (b2, i2))
717 
                  f->bb[b].insn[i].op[j] = REF (b1, i1);
718 
        }
719 
}
720 
 
721 
static int count_cmovs (cuc_insn *ii, int match)
722 
{
723 
  int c = 0, j;
724 
  if (match & 2) {
725 
    for (j = 0; j < MAX_OPERANDS; j++)
726 
      if (ii->opt[j] & OPT_DEST) c++;
727 
  }
728 
  if (match & 1) {
729 
    for (j = 0; j < MAX_OPERANDS; j++)
730 
      if (!(ii->opt[j] & OPT_DEST) && ii->opt[j] & OPT_REF) c++;
731 
  } else {
732 
    for (j = 0; j < MAX_OPERANDS; j++)
733 
      if (!(ii->opt[j] & OPT_DEST) && ii->opt[j] != OPT_NONE) c++;
734 
  }
735 
  return c;
736 
}
737 
 
738 897 markom 
static void search_csm (int iter, cuc_func *f, cuc_shared_list *list);
739 
static cuc_shared_list *main_list;
740 883 markom 
static int *iteration;
741 
 
742 897 markom 
/* CSM -- common subexpression matching -- resource sharing
743 
   We try to match tree of instruction inside a BB with as many
744 
   matches as possible. All possibilities are collected and
745 
   options, making situation worse are removed */
746 883 markom 
void csm (cuc_func *f)
747 
{
748 
  int b, i, j;
749 
  int cnt;
750 897 markom 
  cuc_shared_list *list;
751 883 markom 
  cuc_timings timings;
752 
 
753 
  analyse_timings (f, &timings);
754 
  main_list = NULL;
755 
  for (b = 0; b < f->num_bb; b++) {
756 
    assert (iteration = (int *)malloc (sizeof (int) * f->bb[b].ninsn));
757 
    for (i = 0; i < f->bb[b].ninsn; i++) {
758 
      int cnt = 0, cntc = 0;
759 
      double size = 0., sizec = 0.;
760 
      int j2 = 0;
761 
      for (j = 0; j < f->bb[b].ninsn; j++)
762 
        if (f->bb[b].insn[i].index == f->bb[b].insn[j].index) {
763 
          int ok = 1;
764 
          for (j2 = 0; j2 < MAX_OPERANDS; j2++) if (!(f->bb[b].insn[j].opt[j2] & OPT_REF))
765 
            if (f->bb[b].insn[j].opt[j2] != f->bb[b].insn[i].opt[j2]
766 
             || f->bb[b].insn[j].op[j2] != f->bb[b].insn[i].opt[j2]) {
767 
              ok = 0;
768 
              break;
769 
            }
770 
          if (ok) {
771 
            cntc++;
772 
            sizec = sizec + insn_size (&f->bb[b].insn[j]);
773 
          } else {
774 
            cnt++;
775 
            size = size + insn_size (&f->bb[b].insn[j]);
776 
          }
777 
          iteration[j] = 0;
778 
        } else iteration[j] = -1;
779 
      if (cntc > 1) {
780 897 markom 
        assert (list = (cuc_shared_list *)malloc (sizeof (cuc_shared_list)));
781 883 markom 
        list->next = main_list;
782 
        list->from = NULL;
783 
        list->ref = REF (b, i);
784 
        list->cnt = cnt;
785 
        list->cmatch = 1;
786 
        list->cmovs = count_cmovs (&f->bb[b].insn[i], 3);
787 
        list->osize = sizec;
788 
        list->size = ii_size (f->bb[b].insn[i].index, 1);
789 
        main_list = list;
790 
        search_csm (0, f, list);
791 
      }
792 
      if (cnt > 1) {
793 897 markom 
        assert (list = (cuc_shared_list *)malloc (sizeof (cuc_shared_list)));
794 883 markom 
        list->next = main_list;
795 
        list->from = NULL;
796 
        list->ref = REF (b, i);
797 
        list->cnt = cnt + cntc;
798 
        list->cmatch = 0;
799 
        list->cmovs = count_cmovs (&f->bb[b].insn[i], 2);
800 
        list->osize = size + sizec;
801 
        list->size = ii_size (f->bb[b].insn[i].index, 0);
802 
        main_list = list;
803 
        search_csm (0, f, list);
804 
      }
805 
    }
806 
    free (iteration);
807 
  }
808 
 
809 
  for (list = main_list; list; list = list->next) list->dead = 0;
810 
  cnt = 0;
811 
  for (list = main_list; list; list = list->next) if (!list->dead) cnt++;
812 
  cucdebug (1, "noptions = %i\n", cnt);
813 
 
814 
  /* Now we will check the real size of the 'improvements'; if the size
815 
     actually increases, we abandom the option */
816 
  for (list = main_list; list; list = list->next)
817 
    if (list->cmovs * ii_size (II_CMOV, 0) * (list->cnt - 1) + list->size >= list->osize) list->dead = 1;
818 
 
819 
  cnt = 0;
820 
  for (list = main_list; list; list = list->next) if (!list->dead) cnt++;
821 
  cucdebug (1, "noptions = %i\n", cnt);
822 
 
823 
  /* Count number of instructions grouped */
824 
  for (list = main_list; list; list = list->next) {
825 897 markom 
    cuc_shared_list *l = list;
826 883 markom 
    int c = 0;
827 
    while (l) {
828 
      c++;
829 
      if (f->INSN(l->ref).type & (IT_VOLATILE | IT_MEMORY | IT_MEMADD)) list->dead = 1;
830 
      l = l->from;
831 
    }
832 
    list->ninsn = c;
833 
  }
834 
 
835 
  cnt = 0;
836 
  for (list = main_list; list; list = list->next)
837 
    if (!list->dead) cnt++;
838 
  cucdebug (1, "noptions = %i\n", cnt);
839 
 
840 
#if 1
841 
  /* We can get a lot of options here, so we will delete duplicates */
842 
  for (list = main_list; list; list = list->next) if (!list->dead) {
843 897 markom 
    cuc_shared_list *l;
844 883 markom 
    for (l = list->next; l; l = l->next) if (!l->dead) {
845 
      int ok = 1;
846 897 markom 
      cuc_shared_list *t1 = list;
847 
      cuc_shared_list *t2 = l;
848 883 markom 
      while (ok && t1 && t2) {
849 
        if (f->INSN(t1->ref).index == f->INSN(t2->ref).index) {
850 
          /* If other operands are matching, we must check for them also */
851 
          if (t1->cmatch) {
852 
            int j;
853 
            for (j = 0; j < MAX_OPERANDS; j++)
854 
              if (!(f->INSN(t1->ref).opt[j] & OPT_REF) || !(f->INSN(t2->ref).opt[j] & OPT_REF)
855 
               || f->INSN(t1->ref).opt[j] != f->INSN(t2->ref).opt[j]
856 
               || f->INSN(t1->ref).op[j] != f->INSN(t2->ref).op[j]) {
857 
                ok = 0;
858 
                break;
859 
              }
860 
          }
861 
 
862 
          /* This option is duplicate, remove */
863 
          if (ok) t1->dead = 1;
864 
        }
865 
        t1 = t1->from;
866 
        t2 = t2->from;
867 
      }
868 
    }
869 
  }
870 
  cnt = 0;
871 
  for (list = main_list; list; list = list->next) if (!list->dead) cnt++;
872 
  cucdebug (1, "noptions = %i\n", cnt);
873 
#endif
874 
  /* Print out */
875 
  for (list = main_list; list; list = list->next) if (!list->dead) {
876 897 markom 
    cuc_shared_list *l = list;
877 883 markom 
    cucdebug (1, "%-4s cnt %3i ninsn %3i size %8.1f osize %8.1f cmovs %3i @",
878 
           cuc_insn_name (&f->INSN(list->ref)), list->cnt, list->ninsn,
879 
           list->cmovs * ii_size (II_CMOV, 0) * (list->cnt - 1) + list->size, list->osize, list->cmovs);
880 
    while (l) {
881 
      cucdebug (1, "%c%x,", l->cmatch ? '.' : '!', l->ref);
882 
      l = l->from;
883 
    }
884 
    cucdebug (1, "\n");
885 
  }
886 
 
887 
  /* Calculate estimated timings */
888 
  for (b = 0; b < f->num_bb; b++) {
889 
    cnt = 0;
890 
    for (list = main_list; list; list = list->next)
891 
      if (!list->dead && REF_BB(list->ref) == b) cnt++;
892 
 
893 
    f->bb[b].ntim = cnt;
894 
    if (!cnt) {
895 
      f->bb[b].tim = NULL;
896 
      continue;
897 
    }
898 
    assert (f->bb[b].tim = (cuc_timings *)malloc (sizeof (cuc_timings) * cnt));
899 
 
900 
    cnt = 0;
901 
    for (list = main_list; list; list = list->next) if (!list->dead && REF_BB(list->ref) == b) {
902 897 markom 
      cuc_shared_list *l = list;
903 883 markom 
      f->bb[b].tim[cnt].b = b;
904 
      f->bb[b].tim[cnt].preroll = f->bb[b].tim[cnt].unroll = 1;
905 
      f->bb[b].tim[cnt].nshared = list->ninsn;
906 897 markom 
      assert (f->bb[b].tim[cnt].shared = (cuc_shared_item *)
907 
            malloc (sizeof(cuc_shared_item) * list->ninsn));
908 
      for (i =  0; i < list->ninsn; i++, l = l->from) {
909 
        f->bb[b].tim[cnt].shared[i].ref = l->ref;
910 
        f->bb[b].tim[cnt].shared[i].cmatch = l->cmatch;
911 
      }
912 883 markom 
      f->bb[b].tim[cnt].new_time = timings.new_time + f->bb[b].cnt * (list->cnt - 1);
913 897 markom 
      f->bb[b].tim[cnt].size = timings.size +
914 
             list->cmovs * ii_size (II_CMOV, 0) * (list->cnt - 1) + list->size - list->osize;
915 883 markom 
      cnt++;
916 
    }
917 
  }
918 
}
919 
 
920 
/* Recursive function for searching through instruction graph */
921 897 markom 
static void search_csm (int iter, cuc_func *f, cuc_shared_list *list)
922 883 markom 
{
923 
  int b, i, j, i1;
924 897 markom 
  cuc_shared_list *l;
925 883 markom 
  b = REF_BB(list->ref);
926 
  i = REF_I(list->ref);
927 
 
928 
  for (j = 0; j < MAX_OPERANDS; j++) if (f->bb[b].insn[i].opt[j] & OPT_REF) {
929 
    int t = f->bb[b].insn[i].op[j];
930 
    int cnt = 0, cntc = 0;
931 
    double size = 0., sizec = 0.;
932 
 
933 
    /* Mark neighbours */
934 
    for (i1 = 0; i1 < f->bb[b].ninsn; i1++) {
935 
      if (iteration[i1] == iter && f->bb[b].insn[i1].opt[j] & OPT_REF) {
936 
        int t2 = f->bb[b].insn[i1].op[j];
937 
        if (f->INSN(t).index == f->INSN(t2).index && f->INSN(t2).opt[j] & OPT_REF) {
938 
          int j2;
939 
          int ok = 1;
940 
          iteration[REF_I(t2)] = iter + 1;
941 
          for (j2 = 0; j2 < MAX_OPERANDS; j2++) if (!(f->bb[b].insn[i1].opt[j2] & OPT_REF))
942 
            if (f->bb[b].insn[i1].opt[j2] != f->bb[b].insn[i].opt[j2]
943 
             || f->bb[b].insn[i1].op[j2] != f->bb[b].insn[i].opt[j2]) {
944 
              ok = 0;
945 
              break;
946 
            }
947 
          if (ok) {
948 
            cntc++;
949 
            sizec = sizec + insn_size (&f->bb[b].insn[i1]);
950 
          } else {
951 
            cnt++;
952 
            size = size + insn_size (&f->bb[b].insn[i1]);
953 
          }
954 
        }
955 
      }
956 
    }
957 
 
958 
    if (cntc > 1) {
959 897 markom 
      assert (l = (cuc_shared_list *)malloc (sizeof (cuc_shared_list)));
960 883 markom 
      l->next = main_list;
961 
      main_list = l;
962 
      l->from = list;
963 
      l->ref = t;
964 
      l->cnt = cnt;
965 
      l->cmatch = 1;
966 
      l->cmovs = list->cmovs + count_cmovs (&f->bb[b].insn[i], 1) - 1;
967 
      l->size = list->size + ii_size (f->bb[b].insn[i].index, 1);
968 
      l->osize = sizec;
969 
      search_csm (iter + 1, f, l);
970 
    }
971 
    if (cnt > 1) {
972 897 markom 
      assert (l = (cuc_shared_list *)malloc (sizeof (cuc_shared_list)));
973 883 markom 
      l->next = main_list;
974 
      main_list = l;
975 
      l->from = list;
976 
      l->ref = t;
977 
      l->cnt = cnt + cntc;
978 
      l->cmatch = 0;
979 
      l->osize = size + sizec;
980 
      l->cmovs = list->cmovs + count_cmovs (&f->bb[b].insn[i], 0) - 1;
981 
      l->size = list->size + ii_size (f->bb[b].insn[i].index, 0);
982 
      search_csm (iter + 1, f, l);
983 
    }
984 
 
985 
    /* Unmark them back */
986 
    for (i1 = 0; i1 < f->bb[b].ninsn; i1++) if (iteration[i1] > iter) iteration[i1] = -1;
987 
  }
988 
}
989 
 
990 897 markom 
/* Displays shared instructions */
991 
void print_shared (cuc_func *rf, cuc_shared_item *shared, int nshared)
992 
{
993 
  int i, first = 1;
994 
  for (i = 0; i < nshared; i++) {
995 
    printf ("%s%s%s", first ? "" : "-", cuc_insn_name (rf->INSN(shared[i].ref).index),
996 
                    shared[i].cmatch ? "!" : "");
997 
    first = 0;
998 
  }
999 
}
1000 
 
1001 
/* Common subexpression matching -- resource sharing, generation pass
1002 
 
1003 
   Situation here is much simpler than with analysis -- we know the instruction sequence
1004 
   we are going to share, but we are going to do this on whole function, not just one BB.
1005 
   We can find sequence in reference function, as pointed from "shared" */
1006 
void csm_gen (cuc_func *f, cuc_func *rf, cuc_shared_item *shared, int nshared)
1007 
{
1008 
  int b, i, j, cnt = 0;
1009 
#warning   some code here (2)
1010 
  printf ("Replacing: ");
1011 
  print_shared (rf, shared, nshared);
1012 
 
1013 
  for (b = 0; b < f->num_bb; b++)
1014 
    for (i = 0; i < f->bb[b].ninsn; i++) {
1015 
    }
1016 
 
1017 
  printf ("\nFound %i matches.\n", cnt);
1018 
}
1019 
 

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