summaryrefslogtreecommitdiff
path: root/extra/mesa/gnome-shell-shader-fix.patch
blob: 3b3f37591b3ae3f3da6a349eaa365bd29f34a5f5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
From 3f625689acd570e4f14cc2ebaa43a425d13954ff Mon Sep 17 00:00:00 2001
From: Christoph Bumiller <e0425955@student.tuwien.ac.at>
Date: Thu, 31 Mar 2011 13:49:33 +0000
Subject: nv50: copy regalloc fixes from nvc0

Should fix gnome-shell's fade shader.

Unification of the shader backend which is supposed to remove the
code duplication is still WIP.
---
diff --git a/src/gallium/drivers/nv50/nv50_pc.h b/src/gallium/drivers/nv50/nv50_pc.h
index e6f3815..a9a3248 100644
--- a/src/gallium/drivers/nv50/nv50_pc.h
+++ b/src/gallium/drivers/nv50/nv50_pc.h
@@ -228,6 +228,8 @@ struct nv_ref {
    ubyte flags; /* not used yet */
 };
 
+#define NV_REF_FLAG_REGALLOC_PRIV (1 << 0)
+
 struct nv_basic_block;
 
 struct nv_instruction {
@@ -263,6 +265,15 @@ struct nv_instruction {
    ubyte quadop;
 };
 
+static INLINE int
+nvi_vector_size(struct nv_instruction *nvi)
+{
+   int i;
+   assert(nvi);
+   for (i = 0; i < 4 && nvi->def[i]; ++i);
+   return i;
+}
+
 #define CFG_EDGE_FORWARD     0
 #define CFG_EDGE_BACK        1
 #define CFG_EDGE_LOOP_ENTER  2
diff --git a/src/gallium/drivers/nv50/nv50_pc_regalloc.c b/src/gallium/drivers/nv50/nv50_pc_regalloc.c
index 39ae366..657df2c 100644
--- a/src/gallium/drivers/nv50/nv50_pc_regalloc.c
+++ b/src/gallium/drivers/nv50/nv50_pc_regalloc.c
@@ -32,14 +32,39 @@
 #include "util/u_simple_list.h"
 
 #define NUM_REGISTER_FILES 4
+#define MAX_REGISTER_COUNT 256
 
 struct register_set {
    struct nv_pc *pc;
 
    uint32_t last[NUM_REGISTER_FILES];
-   uint32_t bits[NUM_REGISTER_FILES][8];
+   uint32_t bits[NUM_REGISTER_FILES][(MAX_REGISTER_COUNT + 31) / 32];
 };
 
+/* using OR because a set bit means occupied/unavailable, aliasing is allowed */
+static void
+intersect_register_sets(struct register_set *dst,
+                        struct register_set *src1, struct register_set *src2)
+{
+   int i, j;
+
+   for (i = 0; i < NUM_REGISTER_FILES; ++i) {
+      for (j = 0; j < (MAX_REGISTER_COUNT + 31) / 32; ++j)
+         dst->bits[i][j] = src1->bits[i][j] | src2->bits[i][j];
+   }
+}
+
+static void
+mask_register_set(struct register_set *set, uint32_t mask, uint32_t umask)
+{
+   int i, j;
+
+   for (i = 0; i < NUM_REGISTER_FILES; ++i) {
+      for (j = 0; j < (MAX_REGISTER_COUNT + 31) / 32; ++j)
+         set->bits[i][j] = (set->bits[i][j] | mask) & umask;
+   }
+}
+
 struct nv_pc_pass {
    struct nv_pc *pc;
 
@@ -61,11 +86,15 @@ ranges_coalesce(struct nv_range *range)
    }
 }
 
+/* @return: TRUE if @new_range can be freed (i.e. was not reused) */
 static boolean
 add_range_ex(struct nv_value *val, int bgn, int end, struct nv_range *new_range)
 {
    struct nv_range *range, **nextp = &val->livei;
 
+   if (bgn == end) /* [a, a) is invalid / empty */
+      return TRUE;
+
    for (range = val->livei; range; range = range->next) {
       if (end < range->bgn)
          break; /* insert before */
@@ -251,6 +280,8 @@ reg_occupy(struct register_set *set, struct nv_value *val)
    id <<= s;
    m = (1 << (1 << s)) - 1;
 
+   assert(s >= 0); /* XXX: remove me */
+
    set->bits[f][id / 32] |= m << (id % 32);
 
    if (set->pc->max_reg[f] < id)
@@ -286,15 +317,12 @@ join_allowed(struct nv_pc_pass *ctx, struct nv_value *a, struct nv_value *b)
    if (a->join->reg.id == b->join->reg.id)
       return TRUE;
 
-#if 1
    /* either a or b or both have been assigned */
 
    if (a->join->reg.id >= 0 && b->join->reg.id >= 0)
       return FALSE;
    else
    if (b->join->reg.id >= 0) {
-      if (a->join->reg.id >= 0)
-         return FALSE;
       val = a;
       a = b;
       b = val;
@@ -309,8 +337,6 @@ join_allowed(struct nv_pc_pass *ctx, struct nv_value *a, struct nv_value *b)
          return FALSE;
    }
    return TRUE;
-#endif
-   return FALSE;
 }
 
 static INLINE void
@@ -336,14 +362,14 @@ do_join_values(struct nv_pc_pass *ctx, struct nv_value *a, struct nv_value *b)
    assert(b->join == a->join);
 }
 
-static INLINE void
+static INLINE boolean
 try_join_values(struct nv_pc_pass *ctx, struct nv_value *a, struct nv_value *b)
 {
    if (!join_allowed(ctx, a, b)) {
 #ifdef NV50_RA_DEBUG_JOIN
       debug_printf("cannot join %i to %i: not allowed\n", b->n, a->n);
 #endif
-      return;
+      return FALSE;
    }
    if (livei_have_overlap(a->join, b->join)) {
 #ifdef NV50_RA_DEBUG_JOIN
@@ -351,10 +377,27 @@ try_join_values(struct nv_pc_pass *ctx, struct nv_value *a, struct nv_value *b)
       livei_print(a);
       livei_print(b);
 #endif
-      return;
+      return FALSE;
    }
 
    do_join_values(ctx, a, b);
+
+   return TRUE;
+}
+
+static void
+join_values_nofail(struct nv_pc_pass *ctx,
+                   struct nv_value *a, struct nv_value *b, boolean type_only)
+{
+   if (type_only) {
+      assert(join_allowed(ctx, a, b));
+      do_join_values(ctx, a, b);
+   } else {
+      boolean ok = try_join_values(ctx, a, b);
+      if (!ok) {
+         NOUVEAU_ERR("failed to coalesce values\n");
+      }
+   }
 }
 
 static INLINE boolean
@@ -369,20 +412,32 @@ need_new_else_block(struct nv_basic_block *b, struct nv_basic_block *p)
    return (b->num_in > 1) && (n == 2);
 }
 
+/* Look for the @phi's operand whose definition reaches @b. */
 static int
 phi_opnd_for_bb(struct nv_instruction *phi, struct nv_basic_block *b,
                 struct nv_basic_block *tb)
 {
+   struct nv_ref *srci, *srcj;
    int i, j;
 
-   for (j = -1, i = 0; i < 4 && phi->src[i]; ++i) {
-      if (!nvbb_reachable_by(b, phi->src[i]->value->insn->bb, tb))
+   for (j = -1, i = 0; i < 6 && phi->src[i]; ++i) {
+      srci = phi->src[i];
+      /* if already replaced, check with original source first */
+      if (srci->flags & NV_REF_FLAG_REGALLOC_PRIV)
+         srci = srci->value->insn->src[0];
+      if (!nvbb_reachable_by(b, srci->value->insn->bb, NULL))
          continue;
       /* NOTE: back-edges are ignored by the reachable-by check */
-      if (j < 0 || !nvbb_reachable_by(phi->src[j]->value->insn->bb,
-                                      phi->src[i]->value->insn->bb, tb))
+      if (j < 0 || !nvbb_reachable_by(srcj->value->insn->bb,
+                                      srci->value->insn->bb, NULL)) {
          j = i;
+         srcj = srci;
+      }
    }
+   if (j >= 0 && nvbb_reachable_by(b, phi->def[0]->insn->bb, NULL))
+      if (!nvbb_reachable_by(srcj->value->insn->bb,
+                             phi->def[0]->insn->bb, NULL))
+         j = -1;
    return j;
 }
 
@@ -429,16 +484,21 @@ pass_generate_phi_movs(struct nv_pc_pass *ctx, struct nv_basic_block *b)
       ctx->pc->current_block = pn;
 
       for (i = b->phi; i && i->opcode == NV_OP_PHI; i = i->next) {
-         if ((j = phi_opnd_for_bb(i, p, b)) < 0)
-            continue;
-         val = i->src[j]->value;
-
-         if (i->src[j]->flags) {
-            val = val->insn->src[0]->value;
-            while (j < 4 && i->src[j])
-               ++j;
-            assert(j < 4);
+         j = phi_opnd_for_bb(i, p, b);
+
+         if (j < 0) {
+            val = i->def[0];
+         } else {
+            val = i->src[j]->value;
+            if (i->src[j]->flags & NV_REF_FLAG_REGALLOC_PRIV) {
+               j = -1;
+               /* use original value, we already encountered & replaced it */
+               val = val->insn->src[0]->value;
+            }
          }
+         if (j < 0) /* need an additional source ? */
+            for (j = 0; j < 5 && i->src[j] && i->src[j]->value != val; ++j);
+         assert(j < 5);
 
          ni = new_instruction(ctx->pc, NV_OP_MOV);
 
@@ -452,7 +512,7 @@ pass_generate_phi_movs(struct nv_pc_pass *ctx, struct nv_basic_block *b)
 
          nv_reference(ctx->pc, &i->src[j], ni->def[0]);
 
-         i->src[j]->flags = 1;
+         i->src[j]->flags |= NV_REF_FLAG_REGALLOC_PRIV;
       }
 
       if (pn != p && pn->exit) {
@@ -470,45 +530,50 @@ pass_generate_phi_movs(struct nv_pc_pass *ctx, struct nv_basic_block *b)
    return 0;
 }
 
+#define JOIN_MASK_PHI    (1 << 0)
+#define JOIN_MASK_SELECT (1 << 1)
+#define JOIN_MASK_MOV    (1 << 2)
+#define JOIN_MASK_TEX    (1 << 3)
+
 static int
-pass_join_values(struct nv_pc_pass *ctx, int iter)
+pass_join_values(struct nv_pc_pass *ctx, unsigned mask)
 {
    int c, n;
 
    for (n = 0; n < ctx->num_insns; ++n) {
-      struct nv_instruction *i = ctx->insns[n];
+      struct nv_instruction *nvi, *i = ctx->insns[n];
 
       switch (i->opcode) {
       case NV_OP_PHI:
-         if (iter != 2)
+         if (!(mask & JOIN_MASK_PHI))
             break;
-         for (c = 0; c < 4 && i->src[c]; ++c)
-            try_join_values(ctx, i->def[0], i->src[c]->value);
+         for (c = 0; c < 5 && i->src[c]; ++c)
+            join_values_nofail(ctx, i->def[0], i->src[c]->value, FALSE);
          break;
       case NV_OP_MOV:
-         if ((iter == 2) && i->src[0]->value->insn &&
-             !nv_is_vector_op(i->src[0]->value->join->insn->opcode))
+         if (!(mask & JOIN_MASK_MOV))
+            break;
+         nvi = i->src[0]->value->join->insn;
+         if (nvi && !nv_is_vector_op(nvi->opcode))
             try_join_values(ctx, i->def[0], i->src[0]->value);
          break;
       case NV_OP_SELECT:
-         if (iter != 1)
+         if (!(mask & JOIN_MASK_SELECT))
             break;
-         for (c = 0; c < 4 && i->src[c]; ++c) {
-            assert(join_allowed(ctx, i->def[0], i->src[c]->value));
-            do_join_values(ctx, i->def[0], i->src[c]->value);
-         }
+         for (c = 0; c < 5 && i->src[c]; ++c)
+            join_values_nofail(ctx, i->def[0], i->src[c]->value, TRUE);
          break;
       case NV_OP_TEX:
       case NV_OP_TXB:
       case NV_OP_TXL:
       case NV_OP_TXQ:
-         if (iter)
+         if (!(mask & JOIN_MASK_TEX))
             break;
-         for (c = 0; c < 4; ++c) {
-            if (!i->src[c])
-               break;
-            do_join_values(ctx, i->def[c], i->src[c]->value);
-         }
+         /* This should work without conflicts because we always generate
+          * extra MOVs for the sources of a TEX.
+          */
+         for (c = 0; c < 4 && i->src[c]; ++c)
+            join_values_nofail(ctx, i->def[c], i->src[c]->value, TRUE);
          break;
       default:
          break;
@@ -643,15 +708,15 @@ static void collect_live_values(struct nv_basic_block *b, const int n)
 {
    int i;
 
-   if (b->out[0]) {
-      if (b->out[1]) { /* what to do about back-edges ? */
+   if (b->out[0] && b->out_kind[0] != CFG_EDGE_FAKE) {
+      if (b->out[1] && b->out_kind[1] != CFG_EDGE_FAKE) {
          for (i = 0; i < n; ++i)
             b->live_set[i] = b->out[0]->live_set[i] | b->out[1]->live_set[i];
       } else {
          memcpy(b->live_set, b->out[0]->live_set, n * sizeof(uint32_t));
       }
    } else
-   if (b->out[1]) {
+   if (b->out[1] && b->out_kind[1] != CFG_EDGE_FAKE) {
       memcpy(b->live_set, b->out[1]->live_set, n * sizeof(uint32_t));
    } else {
       memset(b->live_set, 0, n * sizeof(uint32_t));
@@ -770,8 +835,8 @@ insert_ordered_tail(struct nv_value *list, struct nv_value *nval)
    struct nv_value *elem;
 
    for (elem = list->prev;
-	elem != list && elem->livei->bgn > nval->livei->bgn;
-	elem = elem->prev);
+        elem != list && elem->livei->bgn > nval->livei->bgn;
+        elem = elem->prev);
    /* now elem begins before or at the same time as val */
 
    nval->prev = elem;
@@ -780,44 +845,49 @@ insert_ordered_tail(struct nv_value *list, struct nv_value *nval)
    elem->next = nval;
 }
 
-static int
-pass_linear_scan(struct nv_pc_pass *ctx, int iter)
+static void
+collect_register_values(struct nv_pc_pass *ctx, struct nv_value *head,
+                        boolean assigned_only)
 {
-   struct nv_instruction *i;
-   struct register_set f, free;
+   struct nv_value *val;
    int k, n;
-   struct nv_value *cur, *val, *tmp[2];
-   struct nv_value active, inactive, handled, unhandled;
 
-   make_empty_list(&active);
-   make_empty_list(&inactive);
-   make_empty_list(&handled);
-   make_empty_list(&unhandled);
-
-   nv50_ctor_register_set(ctx->pc, &free);
+   make_empty_list(head);
 
-   /* joined values should have range = NULL and thus not be added;
-    * also, fixed memory values won't be added because they're not
-    * def'd, just used
-    */
    for (n = 0; n < ctx->num_insns; ++n) {
-      i = ctx->insns[n];
+      struct nv_instruction *i = ctx->insns[n];
 
+      /* for joined values, only the representative will have livei != NULL */
       for (k = 0; k < 4; ++k) {
          if (i->def[k] && i->def[k]->livei)
-            insert_ordered_tail(&unhandled, i->def[k]);
-         else
-         if (0 && i->def[k])
-            debug_printf("skipping def'd value %i: no livei\n", i->def[k]->n);
+            if (!assigned_only || i->def[k]->reg.id >= 0)
+               insert_ordered_tail(head, i->def[k]);
       }
       if (i->flags_def && i->flags_def->livei)
-         insert_ordered_tail(&unhandled, i->flags_def);
+         if (!assigned_only || i->flags_def->reg.id >= 0)
+            insert_ordered_tail(head, i->flags_def);
    }
 
-   for (val = unhandled.next; val != unhandled.prev; val = val->next) {
+   for (val = head->next; val != head->prev; val = val->next) {
       assert(val->join == val);
       assert(val->livei->bgn <= val->next->livei->bgn);
    }
+}
+
+static int
+pass_linear_scan(struct nv_pc_pass *ctx, int iter)
+{
+   struct register_set f, free;
+   struct nv_value *cur, *val, *tmp[2];
+   struct nv_value active, inactive, handled, unhandled;
+
+   make_empty_list(&active);
+   make_empty_list(&inactive);
+   make_empty_list(&handled);
+
+   nv50_ctor_register_set(ctx->pc, &free);
+
+   collect_register_values(ctx, &unhandled, FALSE);
 
    foreach_s(cur, tmp[0], &unhandled) {
       remove_from_list(cur);
@@ -854,13 +924,7 @@ pass_linear_scan(struct nv_pc_pass *ctx, int iter)
             reg_occupy(&f, val);
 
       if (cur->reg.id < 0) {
-         boolean mem = FALSE;
-
-         if (nv_is_vector_op(cur->insn->opcode))
-            mem = !reg_assign(&f, &cur->insn->def[0], 4);
-         else
-         if (iter)
-            mem = !reg_assign(&f, &cur, 1);
+         boolean mem = !reg_assign(&f, &cur, 1);
 
          if (mem) {
             NOUVEAU_ERR("out of registers\n");
@@ -874,6 +938,67 @@ pass_linear_scan(struct nv_pc_pass *ctx, int iter)
    return 0;
 }
 
+/* Allocate values defined by instructions such as TEX, which have to be
+ * assigned to consecutive registers.
+ * Linear scan doesn't really work here since the values can have different
+ * live intervals.
+ */
+static int
+pass_allocate_constrained_values(struct nv_pc_pass *ctx)
+{
+   struct nv_value regvals, *val;
+   struct nv_instruction *i;
+   struct nv_value *defs[4];
+   struct register_set regs[4];
+   int n, vsize, c;
+   uint32_t mask;
+   boolean mem;
+
+   collect_register_values(ctx, &regvals, TRUE);
+
+   for (n = 0; n < ctx->num_insns; ++n) {
+      i = ctx->insns[n];
+      vsize = nvi_vector_size(i);
+      if (!(vsize > 1))
+         continue;
+      assert(vsize <= 4);
+      for (c = 0; c < vsize; ++c)
+         defs[c] = i->def[c]->join;
+
+      if (defs[0]->reg.id >= 0) {
+         for (c = 1; c < vsize; ++c)
+            assert(defs[c]->reg.id >= 0);
+         continue;
+      }
+
+      for (c = 0; c < vsize; ++c) {
+         nv50_ctor_register_set(ctx->pc, &regs[c]);
+
+         foreach(val, &regvals) {
+            if (val->reg.id >= 0 && livei_have_overlap(val, defs[c]))
+               reg_occupy(&regs[c], val);
+         }
+         mask = 0x11111111;
+         if (vsize == 2) /* granularity is 2 and not 4 */
+            mask |= 0x11111111 << 2;
+         mask_register_set(&regs[c], 0, mask << c);
+
+         if (defs[c]->livei)
+            insert_ordered_tail(&regvals, defs[c]);
+      }
+      for (c = 1; c < vsize; ++c)
+         intersect_register_sets(&regs[0], &regs[0], &regs[c]);
+
+      mem = !reg_assign(&regs[0], &defs[0], vsize);
+
+      if (mem) {
+         NOUVEAU_ERR("out of registers\n");
+         abort();
+      }
+   }
+   return 0;
+}
+
 static int
 nv_pc_pass1(struct nv_pc *pc, struct nv_basic_block *root)
 {
@@ -923,16 +1048,16 @@ nv_pc_pass1(struct nv_pc *pc, struct nv_basic_block *root)
       livei_print(&pc->values[i]);
 #endif
 
-   ret = pass_join_values(ctx, 0);
+   ret = pass_join_values(ctx, JOIN_MASK_PHI);
    if (ret)
       goto out;
-   ret = pass_linear_scan(ctx, 0);
+   ret = pass_join_values(ctx, JOIN_MASK_SELECT | JOIN_MASK_TEX);
    if (ret)
       goto out;
-   ret = pass_join_values(ctx, 1);
+   ret = pass_join_values(ctx, JOIN_MASK_MOV);
    if (ret)
       goto out;
-   ret = pass_join_values(ctx, 2);
+   ret = pass_allocate_constrained_values(ctx);
    if (ret)
       goto out;
    ret = pass_linear_scan(ctx, 1);
--
cgit v0.8.3-6-g21f6