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pan/bi: ADD packing for CONVERT
[mesa.git] / src / panfrost / bifrost / bi_pack.c
1 /*
2 * Copyright (C) 2020 Collabora, Ltd.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice (including the next
12 * paragraph) shall be included in all copies or substantial portions of the
13 * Software.
14 *
15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
16 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
17 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
18 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
19 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
20 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
21 * SOFTWARE.
22 */
23
24 #include "compiler.h"
25
26 #define RETURN_PACKED(str) { \
27 uint64_t temp = 0; \
28 memcpy(&temp, &str, sizeof(str)); \
29 return temp; \
30 }
31
32 /* This file contains the final passes of the compiler. Running after
33 * scheduling and RA, the IR is now finalized, so we need to emit it to actual
34 * bits on the wire (as well as fixup branches) */
35
36 static uint64_t
37 bi_pack_header(bi_clause *clause, bi_clause *next, bool is_fragment)
38 {
39 struct bifrost_header header = {
40 .back_to_back = clause->back_to_back,
41 .no_end_of_shader = (next != NULL),
42 .elide_writes = is_fragment,
43 .branch_cond = clause->branch_conditional,
44 .datareg_writebarrier = clause->data_register_write_barrier,
45 .datareg = clause->data_register,
46 .scoreboard_deps = next ? next->dependencies : 0,
47 .scoreboard_index = clause->scoreboard_id,
48 .clause_type = clause->clause_type,
49 .next_clause_type = next ? next->clause_type : 0,
50 };
51
52 header.branch_cond |= header.back_to_back;
53
54 uint64_t u = 0;
55 memcpy(&u, &header, sizeof(header));
56 return u;
57 }
58
59 /* Represents the assignment of ports for a given bundle */
60
61 struct bi_registers {
62 /* Register to assign to each port */
63 unsigned port[4];
64
65 /* Read ports can be disabled */
66 bool enabled[2];
67
68 /* Should we write FMA? what about ADD? If only a single port is
69 * enabled it is in port 2, else ADD/FMA is 2/3 respectively */
70 bool write_fma, write_add;
71
72 /* Should we read with port 3? */
73 bool read_port3;
74
75 /* Packed uniform/constant */
76 uint8_t uniform_constant;
77
78 /* Whether writes are actually for the last instruction */
79 bool first_instruction;
80 };
81
82 static inline void
83 bi_print_ports(struct bi_registers *regs)
84 {
85 for (unsigned i = 0; i < 2; ++i) {
86 if (regs->enabled[i])
87 printf("port %u: %u\n", i, regs->port[i]);
88 }
89
90 if (regs->write_fma || regs->write_add) {
91 printf("port 2 (%s): %u\n",
92 regs->write_add ? "ADD" : "FMA",
93 regs->port[2]);
94 }
95
96 if ((regs->write_fma && regs->write_add) || regs->read_port3) {
97 printf("port 3 (%s): %u\n",
98 regs->read_port3 ? "read" : "FMA",
99 regs->port[3]);
100 }
101 }
102
103 /* The uniform/constant slot allows loading a contiguous 64-bit immediate or
104 * pushed uniform per bundle. Figure out which one we need in the bundle (the
105 * scheduler needs to ensure we only have one type per bundle), validate
106 * everything, and rewrite away the register/uniform indices to use 3-bit
107 * sources directly. */
108
109 static unsigned
110 bi_lookup_constant(bi_clause *clause, uint64_t cons, bool *hi, bool b64)
111 {
112 uint64_t want = (cons >> 4);
113
114 for (unsigned i = 0; i < clause->constant_count; ++i) {
115 /* Only check top 60-bits since that's what's actually embedded
116 * in the clause, the bottom 4-bits are bundle-inline */
117
118 unsigned candidates[2] = {
119 clause->constants[i] >> 4,
120 clause->constants[i] >> 36
121 };
122
123 if (!b64)
124 candidates[0] &= 0xFFFFFFFF;
125
126 if (candidates[0] == want)
127 return i;
128
129 if (candidates[1] == want && !b64) {
130 *hi = true;
131 return i;
132 }
133 }
134
135 unreachable("Invalid constant accessed");
136 }
137
138 static unsigned
139 bi_constant_field(unsigned idx)
140 {
141 assert(idx <= 5);
142
143 const unsigned values[] = {
144 4, 5, 6, 7, 2, 3
145 };
146
147 return values[idx] << 4;
148 }
149
150 static bool
151 bi_assign_uniform_constant_single(
152 struct bi_registers *regs,
153 bi_clause *clause,
154 bi_instruction *ins, bool assigned, bool fast_zero)
155 {
156 if (!ins)
157 return assigned;
158
159 bi_foreach_src(ins, s) {
160 if (s == 0 && (ins->type == BI_LOAD_VAR_ADDRESS || ins->type == BI_LOAD_ATTR)) continue;
161
162 if (ins->src[s] & BIR_INDEX_CONSTANT) {
163 bool hi = false;
164 bool b64 = nir_alu_type_get_type_size(ins->src_types[s]) > 32;
165 uint64_t cons = bi_get_immediate(ins, ins->src[s]);
166 unsigned idx = bi_lookup_constant(clause, cons, &hi, b64);
167 unsigned f = bi_constant_field(idx) | (cons & 0xF);
168
169 if (assigned && regs->uniform_constant != f)
170 unreachable("Mismatched uniform/const field: imm");
171
172 regs->uniform_constant = f;
173 ins->src[s] = BIR_INDEX_PASS | (hi ? BIFROST_SRC_CONST_HI : BIFROST_SRC_CONST_LO);
174 assigned = true;
175 } else if (ins->src[s] & BIR_INDEX_ZERO && (ins->type == BI_LOAD_UNIFORM || ins->type == BI_LOAD_VAR)) {
176 /* XXX: HACK UNTIL WE HAVE HI MATCHING DUE TO OVERFLOW XXX */
177 ins->src[s] = BIR_INDEX_PASS | BIFROST_SRC_CONST_HI;
178 } else if (ins->src[s] & BIR_INDEX_ZERO && !fast_zero) {
179 /* FMAs have a fast zero port, ADD needs to use the
180 * uniform/const port's special 0 mode handled here */
181 unsigned f = 0;
182
183 if (assigned && regs->uniform_constant != f)
184 unreachable("Mismatched uniform/const field: 0");
185
186 regs->uniform_constant = f;
187 ins->src[s] = BIR_INDEX_PASS | BIFROST_SRC_CONST_LO;
188 assigned = true;
189 } else if (s & BIR_INDEX_UNIFORM) {
190 unreachable("Push uniforms not implemented yet");
191 }
192 }
193
194 return assigned;
195 }
196
197 static void
198 bi_assign_uniform_constant(
199 bi_clause *clause,
200 struct bi_registers *regs,
201 bi_bundle bundle)
202 {
203 bool assigned =
204 bi_assign_uniform_constant_single(regs, clause, bundle.fma, false, true);
205
206 bi_assign_uniform_constant_single(regs, clause, bundle.add, assigned, false);
207 }
208
209 /* Assigns a port for reading, before anything is written */
210
211 static void
212 bi_assign_port_read(struct bi_registers *regs, unsigned src)
213 {
214 /* We only assign for registers */
215 if (!(src & BIR_INDEX_REGISTER))
216 return;
217
218 unsigned reg = src & ~BIR_INDEX_REGISTER;
219
220 /* Check if we already assigned the port */
221 for (unsigned i = 0; i <= 1; ++i) {
222 if (regs->port[i] == reg && regs->enabled[i])
223 return;
224 }
225
226 if (regs->port[3] == reg && regs->read_port3)
227 return;
228
229 /* Assign it now */
230
231 for (unsigned i = 0; i <= 1; ++i) {
232 if (!regs->enabled[i]) {
233 regs->port[i] = reg;
234 regs->enabled[i] = true;
235 return;
236 }
237 }
238
239 if (!regs->read_port3) {
240 regs->port[3] = reg;
241 regs->read_port3 = true;
242 return;
243 }
244
245 bi_print_ports(regs);
246 unreachable("Failed to find a free port for src");
247 }
248
249 static struct bi_registers
250 bi_assign_ports(bi_bundle now, bi_bundle prev)
251 {
252 struct bi_registers regs = { 0 };
253
254 /* We assign ports for the main register mechanism. Special ops
255 * use the data registers, which has its own mechanism entirely
256 * and thus gets skipped over here. */
257
258 unsigned read_dreg = now.add &&
259 bi_class_props[now.add->type] & BI_DATA_REG_SRC;
260
261 unsigned write_dreg = prev.add &&
262 bi_class_props[prev.add->type] & BI_DATA_REG_DEST;
263
264 /* First, assign reads */
265
266 if (now.fma)
267 bi_foreach_src(now.fma, src)
268 bi_assign_port_read(&regs, now.fma->src[src]);
269
270 if (now.add) {
271 bi_foreach_src(now.add, src) {
272 if (!(src == 0 && read_dreg))
273 bi_assign_port_read(&regs, now.add->src[src]);
274 }
275 }
276
277 /* Next, assign writes */
278
279 if (prev.add && prev.add->dest & BIR_INDEX_REGISTER && !write_dreg) {
280 regs.port[2] = prev.add->dest & ~BIR_INDEX_REGISTER;
281 regs.write_add = true;
282 }
283
284 if (prev.fma && prev.fma->dest & BIR_INDEX_REGISTER) {
285 unsigned r = prev.fma->dest & ~BIR_INDEX_REGISTER;
286
287 if (regs.write_add) {
288 /* Scheduler constraint: cannot read 3 and write 2 */
289 assert(!regs.read_port3);
290 regs.port[3] = r;
291 } else {
292 regs.port[2] = r;
293 }
294
295 regs.write_fma = true;
296 }
297
298 /* Finally, ensure port 1 > port 0 for the 63-x trick to function */
299
300 if (regs.enabled[0] && regs.enabled[1] && regs.port[1] < regs.port[0]) {
301 unsigned temp = regs.port[0];
302 regs.port[0] = regs.port[1];
303 regs.port[1] = temp;
304 }
305
306 return regs;
307 }
308
309 /* Determines the register control field, ignoring the first? flag */
310
311 static enum bifrost_reg_control
312 bi_pack_register_ctrl_lo(struct bi_registers r)
313 {
314 if (r.write_fma) {
315 if (r.write_add) {
316 assert(!r.read_port3);
317 return BIFROST_WRITE_ADD_P2_FMA_P3;
318 } else {
319 if (r.read_port3)
320 return BIFROST_WRITE_FMA_P2_READ_P3;
321 else
322 return BIFROST_WRITE_FMA_P2;
323 }
324 } else if (r.write_add) {
325 if (r.read_port3)
326 return BIFROST_WRITE_ADD_P2_READ_P3;
327 else
328 return BIFROST_WRITE_ADD_P2;
329 } else if (r.read_port3)
330 return BIFROST_READ_P3;
331 else
332 return BIFROST_REG_NONE;
333 }
334
335 /* Ditto but account for the first? flag this time */
336
337 static enum bifrost_reg_control
338 bi_pack_register_ctrl(struct bi_registers r)
339 {
340 enum bifrost_reg_control ctrl = bi_pack_register_ctrl_lo(r);
341
342 if (r.first_instruction) {
343 if (ctrl == BIFROST_REG_NONE)
344 ctrl = BIFROST_FIRST_NONE;
345 else if (ctrl == BIFROST_WRITE_FMA_P2_READ_P3)
346 ctrl = BIFROST_FIRST_WRITE_FMA_P2_READ_P3;
347 else
348 ctrl |= BIFROST_FIRST_NONE;
349 }
350
351 return ctrl;
352 }
353
354 static uint64_t
355 bi_pack_registers(struct bi_registers regs)
356 {
357 enum bifrost_reg_control ctrl = bi_pack_register_ctrl(regs);
358 struct bifrost_regs s = { 0 };
359 uint64_t packed = 0;
360
361 if (regs.enabled[1]) {
362 /* Gotta save that bit!~ Required by the 63-x trick */
363 assert(regs.port[1] > regs.port[0]);
364 assert(regs.enabled[0]);
365
366 /* Do the 63-x trick, see docs/disasm */
367 if (regs.port[0] > 31) {
368 regs.port[0] = 63 - regs.port[0];
369 regs.port[1] = 63 - regs.port[1];
370 }
371
372 assert(regs.port[0] <= 31);
373 assert(regs.port[1] <= 63);
374
375 s.ctrl = ctrl;
376 s.reg1 = regs.port[1];
377 s.reg0 = regs.port[0];
378 } else {
379 /* Port 1 disabled, so set to zero and use port 1 for ctrl */
380 s.ctrl = 0;
381 s.reg1 = ctrl << 2;
382
383 if (regs.enabled[0]) {
384 /* Bit 0 upper bit of port 0 */
385 s.reg1 |= (regs.port[0] >> 5);
386
387 /* Rest of port 0 in usual spot */
388 s.reg0 = (regs.port[0] & 0b11111);
389 } else {
390 /* Bit 1 set if port 0 also disabled */
391 s.reg1 |= (1 << 1);
392 }
393 }
394
395 /* When port 3 isn't used, we have to set it to port 2, and vice versa,
396 * or INSTR_INVALID_ENC is raised. The reason is unknown. */
397
398 bool has_port2 = regs.write_fma || regs.write_add;
399 bool has_port3 = regs.read_port3 || (regs.write_fma && regs.write_add);
400
401 if (!has_port3)
402 regs.port[3] = regs.port[2];
403
404 if (!has_port2)
405 regs.port[2] = regs.port[3];
406
407 s.reg3 = regs.port[3];
408 s.reg2 = regs.port[2];
409 s.uniform_const = regs.uniform_constant;
410
411 memcpy(&packed, &s, sizeof(s));
412 return packed;
413 }
414
415 static void
416 bi_set_data_register(bi_clause *clause, unsigned idx)
417 {
418 assert(idx & BIR_INDEX_REGISTER);
419 unsigned reg = idx & ~BIR_INDEX_REGISTER;
420 assert(reg <= 63);
421 clause->data_register = reg;
422 }
423
424 static void
425 bi_read_data_register(bi_clause *clause, bi_instruction *ins)
426 {
427 bi_set_data_register(clause, ins->src[0]);
428 }
429
430 static void
431 bi_write_data_register(bi_clause *clause, bi_instruction *ins)
432 {
433 bi_set_data_register(clause, ins->dest);
434 }
435
436 static enum bifrost_packed_src
437 bi_get_src_reg_port(struct bi_registers *regs, unsigned src)
438 {
439 unsigned reg = src & ~BIR_INDEX_REGISTER;
440
441 if (regs->port[0] == reg && regs->enabled[0])
442 return BIFROST_SRC_PORT0;
443 else if (regs->port[1] == reg && regs->enabled[1])
444 return BIFROST_SRC_PORT1;
445 else if (regs->port[3] == reg && regs->read_port3)
446 return BIFROST_SRC_PORT3;
447 else
448 unreachable("Tried to access register with no port");
449 }
450
451 static enum bifrost_packed_src
452 bi_get_src(bi_instruction *ins, struct bi_registers *regs, unsigned s, bool is_fma)
453 {
454 unsigned src = ins->src[s];
455
456 if (src & BIR_INDEX_REGISTER)
457 return bi_get_src_reg_port(regs, src);
458 else if (src & BIR_INDEX_ZERO && is_fma)
459 return BIFROST_SRC_STAGE;
460 else if (src & BIR_INDEX_PASS)
461 return src & ~BIR_INDEX_PASS;
462 else
463 unreachable("Unknown src");
464 }
465
466 /* Constructs a packed 2-bit swizzle for a 16-bit vec2 source. Source must be
467 * 16-bit and written components must correspond to valid swizzles (component x
468 * or y). */
469
470 static unsigned
471 bi_swiz16(bi_instruction *ins, unsigned src)
472 {
473 assert(nir_alu_type_get_type_size(ins->src_types[src]) == 16);
474 unsigned swizzle = 0;
475
476 for (unsigned c = 0; c < 2; ++c) {
477 if (!bi_writes_component(ins, src)) continue;
478
479 unsigned k = ins->swizzle[src][c];
480 assert(k <= 1);
481 swizzle |= (k << c);
482 }
483
484 return swizzle;
485 }
486
487 static unsigned
488 bi_pack_fma_fma(bi_instruction *ins, struct bi_registers *regs)
489 {
490 /* (-a)(-b) = ab, so we only need one negate bit */
491 bool negate_mul = ins->src_neg[0] ^ ins->src_neg[1];
492
493 if (ins->dest_type == nir_type_float32) {
494 struct bifrost_fma_fma pack = {
495 .src0 = bi_get_src(ins, regs, 0, true),
496 .src1 = bi_get_src(ins, regs, 1, true),
497 .src2 = bi_get_src(ins, regs, 2, true),
498 .src0_abs = ins->src_abs[0],
499 .src1_abs = ins->src_abs[1],
500 .src2_abs = ins->src_abs[2],
501 .src0_neg = negate_mul,
502 .src2_neg = ins->src_neg[2],
503 .outmod = ins->outmod,
504 .roundmode = ins->roundmode,
505 .op = BIFROST_FMA_OP_FMA
506 };
507
508 RETURN_PACKED(pack);
509 } else if (ins->dest_type == nir_type_float16) {
510 struct bifrost_fma_fma16 pack = {
511 .src0 = bi_get_src(ins, regs, 0, true),
512 .src1 = bi_get_src(ins, regs, 1, true),
513 .src2 = bi_get_src(ins, regs, 2, true),
514 .swizzle_0 = bi_swiz16(ins, 0),
515 .swizzle_1 = bi_swiz16(ins, 1),
516 .swizzle_2 = bi_swiz16(ins, 2),
517 .src0_neg = negate_mul,
518 .src2_neg = ins->src_neg[2],
519 .outmod = ins->outmod,
520 .roundmode = ins->roundmode,
521 .op = BIFROST_FMA_OP_FMA16
522 };
523
524 RETURN_PACKED(pack);
525 } else {
526 unreachable("Invalid fma dest type");
527 }
528 }
529
530 static unsigned
531 bi_pack_fma_addmin_f32(bi_instruction *ins, struct bi_registers *regs)
532 {
533 unsigned op =
534 (ins->type == BI_ADD) ? BIFROST_FMA_OP_FADD32 :
535 (ins->op.minmax == BI_MINMAX_MIN) ? BIFROST_FMA_OP_FMIN32 :
536 BIFROST_FMA_OP_FMAX32;
537
538 struct bifrost_fma_add pack = {
539 .src0 = bi_get_src(ins, regs, 0, true),
540 .src1 = bi_get_src(ins, regs, 1, true),
541 .src0_abs = ins->src_abs[0],
542 .src1_abs = ins->src_abs[1],
543 .src0_neg = ins->src_neg[0],
544 .src1_neg = ins->src_neg[1],
545 .unk = 0x0,
546 .outmod = ins->outmod,
547 .roundmode = (ins->type == BI_ADD) ? ins->roundmode : ins->minmax,
548 .op = op
549 };
550
551 RETURN_PACKED(pack);
552 }
553
554 static unsigned
555 bi_pack_fma_addmin_f16(bi_instruction *ins, struct bi_registers *regs)
556 {
557 unsigned op =
558 (ins->type == BI_ADD) ? BIFROST_FMA_OP_FADD16 :
559 (ins->op.minmax == BI_MINMAX_MIN) ? BIFROST_FMA_OP_FMIN16 :
560 BIFROST_FMA_OP_FMAX16;
561
562 /* Absolute values are packed in a quirky way. Let k = src1 < src0. Let
563 * l be an auxiliary bit we encode. Then the hardware determines:
564 *
565 * abs0 = l || k
566 * abs1 = l && k
567 *
568 * Since add/min/max are commutative, this saves a bit by using the
569 * order of the operands as a bit (k). To pack this, first note:
570 *
571 * (l && k) implies (l || k).
572 *
573 * That is, if the second argument is abs'd, then the first argument
574 * also has abs. So there are three cases:
575 *
576 * Case 0: Neither src has absolute value. Then we have l = k = 0.
577 *
578 * Case 1: Exactly one src has absolute value. Assign that source to
579 * src0 and the other source to src1. Compute k = src1 < src0 based on
580 * that assignment. Then l = ~k.
581 *
582 * Case 2: Both sources have absolute value. Then we have l = k = 1.
583 * Note to force k = 1 requires that (src1 < src0) OR (src0 < src1).
584 * That is, this encoding is only valid if src1 and src0 are distinct.
585 * This is a scheduling restriction (XXX); if an op of this type
586 * requires both identical sources to have abs value, then we must
587 * schedule to ADD (which does not use this ordering trick).
588 */
589
590 unsigned abs_0 = ins->src_abs[0], abs_1 = ins->src_abs[1];
591 unsigned src_0 = bi_get_src(ins, regs, 0, true);
592 unsigned src_1 = bi_get_src(ins, regs, 1, true);
593 bool l = false;
594 bool flip = false;
595
596 if (!abs_0 && !abs_1) {
597 /* Force k = 0 <===> NOT(src1 < src0) */
598 flip = (src_1 < src_0);
599 } else if (abs_0 && !abs_1) {
600 l = src_1 >= src_0;
601 } else if (abs_1 && !abs_0) {
602 flip = true;
603 l = src_0 >= src_1;
604 } else {
605 flip = (src_0 >= src_1);
606 l = true;
607 }
608
609 struct bifrost_fma_add_minmax16 pack = {
610 .src0 = flip ? src_1 : src_0,
611 .src1 = flip ? src_0 : src_1,
612 .src0_neg = ins->src_neg[flip ? 1 : 0],
613 .src1_neg = ins->src_neg[flip ? 0 : 1],
614 .abs1 = l,
615 .outmod = ins->outmod,
616 .mode = (ins->type == BI_ADD) ? ins->roundmode : ins->minmax,
617 .op = op
618 };
619
620 RETURN_PACKED(pack);
621 }
622
623 static unsigned
624 bi_pack_fma_addmin(bi_instruction *ins, struct bi_registers *regs)
625 {
626 if (ins->dest_type == nir_type_float32)
627 return bi_pack_fma_addmin_f32(ins, regs);
628 else if(ins->dest_type == nir_type_float16)
629 return bi_pack_fma_addmin_f16(ins, regs);
630 else
631 unreachable("Unknown FMA/ADD type");
632 }
633
634 static unsigned
635 bi_pack_fma_1src(bi_instruction *ins, struct bi_registers *regs, unsigned op)
636 {
637 struct bifrost_fma_inst pack = {
638 .src0 = bi_get_src(ins, regs, 0, true),
639 .op = op
640 };
641
642 RETURN_PACKED(pack);
643 }
644
645 static unsigned
646 bi_pack_add_1src(bi_instruction *ins, struct bi_registers *regs, unsigned op)
647 {
648 struct bifrost_add_inst pack = {
649 .src0 = bi_get_src(ins, regs, 0, true),
650 .op = op
651 };
652
653 RETURN_PACKED(pack);
654 }
655
656 static enum bifrost_csel_cond
657 bi_cond_to_csel(enum bi_cond cond, bool *flip, bool *invert, nir_alu_type T)
658 {
659 nir_alu_type B = nir_alu_type_get_base_type(T);
660 unsigned idx = (B == nir_type_float) ? 0 :
661 ((B == nir_type_int) ? 1 : 2);
662
663 switch (cond){
664 case BI_COND_LT:
665 *flip = true;
666 case BI_COND_GT: {
667 const enum bifrost_csel_cond ops[] = {
668 BIFROST_FGT_F,
669 BIFROST_IGT_I,
670 BIFROST_UGT_I
671 };
672
673 return ops[idx];
674 }
675 case BI_COND_LE:
676 *flip = true;
677 case BI_COND_GE: {
678 const enum bifrost_csel_cond ops[] = {
679 BIFROST_FGE_F,
680 BIFROST_IGE_I,
681 BIFROST_UGE_I
682 };
683
684 return ops[idx];
685 }
686 case BI_COND_NE:
687 *invert = true;
688 case BI_COND_EQ: {
689 const enum bifrost_csel_cond ops[] = {
690 BIFROST_FEQ_F,
691 BIFROST_IEQ_F,
692 BIFROST_IEQ_F /* sign is irrelevant */
693 };
694
695 return ops[idx];
696 }
697 default:
698 unreachable("Invalid op for csel");
699 }
700 }
701
702 static unsigned
703 bi_pack_fma_csel(bi_instruction *ins, struct bi_registers *regs)
704 {
705 /* TODO: Use csel3 as well */
706 bool flip = false, invert = false;
707
708 enum bifrost_csel_cond cond =
709 bi_cond_to_csel(ins->csel_cond, &flip, &invert, ins->src_types[0]);
710
711 unsigned size = nir_alu_type_get_type_size(ins->dest_type);
712
713 unsigned cmp_0 = (flip ? 1 : 0);
714 unsigned cmp_1 = (flip ? 0 : 1);
715 unsigned res_0 = (invert ? 3 : 2);
716 unsigned res_1 = (invert ? 2 : 3);
717
718 struct bifrost_csel4 pack = {
719 .src0 = bi_get_src(ins, regs, cmp_0, true),
720 .src1 = bi_get_src(ins, regs, cmp_1, true),
721 .src2 = bi_get_src(ins, regs, res_0, true),
722 .src3 = bi_get_src(ins, regs, res_1, true),
723 .cond = cond,
724 .op = (size == 16) ? BIFROST_FMA_OP_CSEL4_V16 :
725 BIFROST_FMA_OP_CSEL4
726 };
727
728 RETURN_PACKED(pack);
729 }
730
731 /* We have a single convert opcode in the IR but a number of opcodes that could
732 * come out. In particular we have native opcodes for:
733 *
734 * [ui]16 --> [fui]32 -- int16_to_32
735 * f16 --> f32 -- float16_to_32
736 * f32 --> f16 -- float32_to_16
737 * f32 --> [ui]32 -- float32_to_int
738 * [ui]32 --> f32 -- int_to_float32
739 * [fui]16 --> [fui]16 -- f2i_i2f16
740 */
741
742 static unsigned
743 bi_pack_convert(bi_instruction *ins, struct bi_registers *regs, bool FMA)
744 {
745 nir_alu_type from_base = nir_alu_type_get_base_type(ins->src_types[0]);
746 unsigned from_size = nir_alu_type_get_type_size(ins->src_types[0]);
747 bool from_unsigned = from_base == nir_type_uint;
748
749 nir_alu_type to_base = nir_alu_type_get_base_type(ins->dest_type);
750 unsigned to_size = nir_alu_type_get_type_size(ins->dest_type);
751 bool to_unsigned = to_base == nir_type_uint;
752 bool to_float = to_base == nir_type_float;
753
754 /* Sanity check */
755 assert((from_base != to_base) || (from_size != to_size));
756 assert((MAX2(from_size, to_size) / MIN2(from_size, to_size)) <= 2);
757
758 /* f32 to f16 is special */
759 if (from_size == 32 && to_size == 16 && from_base == nir_type_float && to_base == from_base) {
760 /* TODO: second vectorized source? */
761 struct bifrost_fma_2src pfma = {
762 .src0 = bi_get_src(ins, regs, 0, true),
763 .src1 = BIFROST_SRC_STAGE, /* 0 */
764 .op = BIFROST_FMA_FLOAT32_TO_16
765 };
766
767 struct bifrost_add_2src padd = {
768 .src0 = bi_get_src(ins, regs, 0, true),
769 .src1 = BIFROST_SRC_STAGE, /* 0 */
770 .op = BIFROST_ADD_FLOAT32_TO_16
771 };
772
773 if (FMA) {
774 RETURN_PACKED(pfma);
775 } else {
776 RETURN_PACKED(padd);
777 }
778 }
779
780 /* Otherwise, figure out the mode */
781 unsigned op = 0;
782
783 if (from_size == 16 && to_size == 32) {
784 unsigned component = ins->swizzle[0][0];
785 assert(component <= 1);
786
787 if (from_base == nir_type_float)
788 op = BIFROST_CONVERT_5(component);
789 else
790 op = BIFROST_CONVERT_4(from_unsigned, component, to_float);
791 } else {
792 unsigned mode = 0;
793 unsigned swizzle = (from_size == 16) ? bi_swiz16(ins, 0) : 0;
794 bool is_unsigned = from_unsigned;
795
796 if (from_base == nir_type_float) {
797 assert(to_base != nir_type_float);
798 is_unsigned = to_unsigned;
799
800 if (from_size == 32 && to_size == 32)
801 mode = BIFROST_CONV_F32_TO_I32;
802 else if (from_size == 16 && to_size == 16)
803 mode = BIFROST_CONV_F16_TO_I16;
804 else
805 unreachable("Invalid float conversion");
806 } else {
807 assert(to_base == nir_type_float);
808 assert(from_size == to_size);
809
810 if (to_size == 32)
811 mode = BIFROST_CONV_I32_TO_F32;
812 else if (to_size == 16)
813 mode = BIFROST_CONV_I16_TO_F16;
814 else
815 unreachable("Invalid int conversion");
816 }
817
818 /* Fixup swizzle for 32-bit only modes */
819
820 if (mode == BIFROST_CONV_I32_TO_F32)
821 swizzle = 0b11;
822 else if (mode == BIFROST_CONV_F32_TO_I32)
823 swizzle = 0b10;
824
825 op = BIFROST_CONVERT(is_unsigned, ins->roundmode, swizzle, mode);
826
827 /* Unclear what the top bit is for... maybe 16-bit related */
828 bool mode2 = mode == BIFROST_CONV_F16_TO_I16;
829 bool mode6 = mode == BIFROST_CONV_I16_TO_F16;
830
831 if (!(mode2 || mode6))
832 op |= 0x100;
833 }
834
835 if (FMA)
836 return bi_pack_fma_1src(ins, regs, BIFROST_FMA_CONVERT | op);
837 else
838 return bi_pack_add_1src(ins, regs, BIFROST_ADD_CONVERT | op);
839 }
840
841 static unsigned
842 bi_pack_fma(bi_clause *clause, bi_bundle bundle, struct bi_registers *regs)
843 {
844 if (!bundle.fma)
845 return BIFROST_FMA_NOP;
846
847 switch (bundle.fma->type) {
848 case BI_ADD:
849 return bi_pack_fma_addmin(bundle.fma, regs);
850 case BI_CMP:
851 case BI_BITWISE:
852 return BIFROST_FMA_NOP;
853 case BI_CONVERT:
854 return bi_pack_convert(bundle.fma, regs, true);
855 case BI_CSEL:
856 return bi_pack_fma_csel(bundle.fma, regs);
857 case BI_FMA:
858 return bi_pack_fma_fma(bundle.fma, regs);
859 case BI_FREXP:
860 case BI_ISUB:
861 return BIFROST_FMA_NOP;
862 case BI_MINMAX:
863 return bi_pack_fma_addmin(bundle.fma, regs);
864 case BI_MOV:
865 return bi_pack_fma_1src(bundle.fma, regs, BIFROST_FMA_OP_MOV);
866 case BI_SHIFT:
867 case BI_SWIZZLE:
868 case BI_ROUND:
869 return BIFROST_FMA_NOP;
870 default:
871 unreachable("Cannot encode class as FMA");
872 }
873 }
874
875 static unsigned
876 bi_pack_add_ld_vary(bi_clause *clause, bi_instruction *ins, struct bi_registers *regs)
877 {
878 unsigned size = nir_alu_type_get_type_size(ins->dest_type);
879 assert(size == 32 || size == 16);
880
881 unsigned op = (size == 32) ?
882 BIFROST_ADD_OP_LD_VAR_32 :
883 BIFROST_ADD_OP_LD_VAR_16;
884
885 unsigned cmask = bi_from_bytemask(ins->writemask, size / 8);
886 unsigned channels = util_bitcount(cmask);
887 assert(cmask == ((1 << channels) - 1));
888
889 unsigned packed_addr = 0;
890
891 if (ins->src[0] & BIR_INDEX_CONSTANT) {
892 /* Direct uses address field directly */
893 packed_addr = bi_get_immediate(ins, ins->src[0]);
894 assert(packed_addr < 0b1000);
895 } else {
896 /* Indirect gets an extra source */
897 packed_addr = bi_get_src(ins, regs, 0, false) | 0b11000;
898 }
899
900 /* The destination is thrown in the data register */
901 assert(ins->dest & BIR_INDEX_REGISTER);
902 clause->data_register = ins->dest & ~BIR_INDEX_REGISTER;
903
904 assert(channels >= 1 && channels <= 4);
905
906 struct bifrost_ld_var pack = {
907 .src0 = bi_get_src(ins, regs, 1, false),
908 .addr = packed_addr,
909 .channels = MALI_POSITIVE(channels),
910 .interp_mode = ins->load_vary.interp_mode,
911 .reuse = ins->load_vary.reuse,
912 .flat = ins->load_vary.flat,
913 .op = op
914 };
915
916 RETURN_PACKED(pack);
917 }
918
919 static unsigned
920 bi_pack_add_2src(bi_instruction *ins, struct bi_registers *regs, unsigned op)
921 {
922 struct bifrost_add_2src pack = {
923 .src0 = bi_get_src(ins, regs, 0, true),
924 .src1 = bi_get_src(ins, regs, 1, true),
925 .op = op
926 };
927
928 RETURN_PACKED(pack);
929 }
930
931 static unsigned
932 bi_pack_add_addmin_f32(bi_instruction *ins, struct bi_registers *regs)
933 {
934 unsigned op =
935 (ins->type == BI_ADD) ? BIFROST_ADD_OP_FADD32 :
936 (ins->op.minmax == BI_MINMAX_MIN) ? BIFROST_ADD_OP_FMIN32 :
937 BIFROST_ADD_OP_FMAX32;
938
939 struct bifrost_add_faddmin pack = {
940 .src0 = bi_get_src(ins, regs, 0, true),
941 .src1 = bi_get_src(ins, regs, 1, true),
942 .src0_abs = ins->src_abs[0],
943 .src1_abs = ins->src_abs[1],
944 .src0_neg = ins->src_neg[0],
945 .src1_neg = ins->src_neg[1],
946 .outmod = ins->outmod,
947 .mode = (ins->type == BI_ADD) ? ins->roundmode : ins->minmax,
948 .op = op
949 };
950
951 RETURN_PACKED(pack);
952 }
953
954 static unsigned
955 bi_pack_add_addmin(bi_instruction *ins, struct bi_registers *regs)
956 {
957 if (ins->dest_type == nir_type_float32)
958 return bi_pack_add_addmin_f32(ins, regs);
959 else if(ins->dest_type == nir_type_float16)
960 unreachable("todo");
961 //return bi_pack_add_addmin_f16(ins, regs);
962 else
963 unreachable("Unknown FMA/ADD type");
964 }
965
966 static unsigned
967 bi_pack_add_ld_ubo(bi_clause *clause, bi_instruction *ins, struct bi_registers *regs)
968 {
969 unsigned components = bi_load32_components(ins);
970
971 const unsigned ops[4] = {
972 BIFROST_ADD_OP_LD_UBO_1,
973 BIFROST_ADD_OP_LD_UBO_2,
974 BIFROST_ADD_OP_LD_UBO_3,
975 BIFROST_ADD_OP_LD_UBO_4
976 };
977
978 bi_write_data_register(clause, ins);
979 return bi_pack_add_2src(ins, regs, ops[components - 1]);
980 }
981
982 static enum bifrost_ldst_type
983 bi_pack_ldst_type(nir_alu_type T)
984 {
985 switch (T) {
986 case nir_type_float16: return BIFROST_LDST_F16;
987 case nir_type_float32: return BIFROST_LDST_F32;
988 case nir_type_int32: return BIFROST_LDST_I32;
989 case nir_type_uint32: return BIFROST_LDST_U32;
990 default: unreachable("Invalid type loaded");
991 }
992 }
993
994 static unsigned
995 bi_pack_add_ld_var_addr(bi_clause *clause, bi_instruction *ins, struct bi_registers *regs)
996 {
997 struct bifrost_ld_var_addr pack = {
998 .src0 = bi_get_src(ins, regs, 1, false),
999 .src1 = bi_get_src(ins, regs, 2, false),
1000 .location = bi_get_immediate(ins, ins->src[0]),
1001 .type = bi_pack_ldst_type(ins->src_types[3]),
1002 .op = BIFROST_ADD_OP_LD_VAR_ADDR
1003 };
1004
1005 bi_write_data_register(clause, ins);
1006 RETURN_PACKED(pack);
1007 }
1008
1009 static unsigned
1010 bi_pack_add_ld_attr(bi_clause *clause, bi_instruction *ins, struct bi_registers *regs)
1011 {
1012 struct bifrost_ld_attr pack = {
1013 .src0 = bi_get_src(ins, regs, 1, false),
1014 .src1 = bi_get_src(ins, regs, 2, false),
1015 .location = bi_get_immediate(ins, ins->src[0]),
1016 .channels = MALI_POSITIVE(bi_load32_components(ins)),
1017 .type = bi_pack_ldst_type(ins->dest_type),
1018 .op = BIFROST_ADD_OP_LD_ATTR
1019 };
1020
1021 bi_write_data_register(clause, ins);
1022 RETURN_PACKED(pack);
1023 }
1024
1025 static unsigned
1026 bi_pack_add_st_vary(bi_clause *clause, bi_instruction *ins, struct bi_registers *regs)
1027 {
1028 assert(ins->store_channels >= 1 && ins->store_channels <= 4);
1029
1030 struct bifrost_st_vary pack = {
1031 .src0 = bi_get_src(ins, regs, 1, false),
1032 .src1 = bi_get_src(ins, regs, 2, false),
1033 .src2 = bi_get_src(ins, regs, 3, false),
1034 .channels = MALI_POSITIVE(ins->store_channels),
1035 .op = BIFROST_ADD_OP_ST_VAR
1036 };
1037
1038 bi_read_data_register(clause, ins);
1039 RETURN_PACKED(pack);
1040 }
1041
1042 static unsigned
1043 bi_pack_add_atest(bi_clause *clause, bi_instruction *ins, struct bi_registers *regs)
1044 {
1045 /* TODO: fp16 */
1046 assert(ins->src_types[1] == nir_type_float32);
1047
1048 struct bifrost_add_atest pack = {
1049 .src0 = bi_get_src(ins, regs, 0, false),
1050 .src1 = bi_get_src(ins, regs, 1, false),
1051 .component = 1, /* Set for fp32 */
1052 .op = BIFROST_ADD_OP_ATEST,
1053 };
1054
1055 /* Despite *also* writing with the usual mechanism... quirky and
1056 * perhaps unnecessary, but let's match the blob */
1057 clause->data_register = ins->dest & ~BIR_INDEX_REGISTER;
1058
1059 RETURN_PACKED(pack);
1060 }
1061
1062 static unsigned
1063 bi_pack_add_blend(bi_clause *clause, bi_instruction *ins, struct bi_registers *regs)
1064 {
1065 struct bifrost_add_inst pack = {
1066 .src0 = bi_get_src(ins, regs, 1, false),
1067 .op = BIFROST_ADD_OP_BLEND
1068 };
1069
1070 /* TODO: Pack location in uniform_const */
1071 assert(ins->blend_location == 0);
1072
1073 bi_read_data_register(clause, ins);
1074 RETURN_PACKED(pack);
1075 }
1076
1077 static unsigned
1078 bi_pack_add_special(bi_instruction *ins, struct bi_registers *regs)
1079 {
1080 unsigned op = 0;
1081 bool fp16 = ins->dest_type == nir_type_float16;
1082 bool Y = ins->swizzle[0][0];
1083
1084 if (ins->op.special == BI_SPECIAL_FRCP) {
1085 op = fp16 ?
1086 (Y ? BIFROST_ADD_OP_FRCP_FAST_F16_Y :
1087 BIFROST_ADD_OP_FRCP_FAST_F16_X) :
1088 BIFROST_ADD_OP_FRCP_FAST_F32;
1089 } else {
1090 op = fp16 ?
1091 (Y ? BIFROST_ADD_OP_FRSQ_FAST_F16_Y :
1092 BIFROST_ADD_OP_FRSQ_FAST_F16_X) :
1093 BIFROST_ADD_OP_FRSQ_FAST_F32;
1094
1095 }
1096
1097 return bi_pack_add_1src(ins, regs, op);
1098 }
1099
1100 static unsigned
1101 bi_pack_add(bi_clause *clause, bi_bundle bundle, struct bi_registers *regs)
1102 {
1103 if (!bundle.add)
1104 return BIFROST_ADD_NOP;
1105
1106 switch (bundle.add->type) {
1107 case BI_ADD:
1108 return bi_pack_add_addmin(bundle.add, regs);
1109 case BI_ATEST:
1110 return bi_pack_add_atest(clause, bundle.add, regs);
1111 case BI_BRANCH:
1112 case BI_CMP:
1113 return BIFROST_ADD_NOP;
1114 case BI_BLEND:
1115 return bi_pack_add_blend(clause, bundle.add, regs);
1116 case BI_BITWISE:
1117 return BIFROST_ADD_NOP;
1118 case BI_CONVERT:
1119 return bi_pack_convert(bundle.add, regs, false);
1120 case BI_DISCARD:
1121 case BI_FREXP:
1122 case BI_ISUB:
1123 case BI_LOAD:
1124 return BIFROST_ADD_NOP;
1125 case BI_LOAD_ATTR:
1126 return bi_pack_add_ld_attr(clause, bundle.add, regs);
1127 case BI_LOAD_UNIFORM:
1128 return bi_pack_add_ld_ubo(clause, bundle.add, regs);
1129 case BI_LOAD_VAR:
1130 return bi_pack_add_ld_vary(clause, bundle.add, regs);
1131 case BI_LOAD_VAR_ADDRESS:
1132 return bi_pack_add_ld_var_addr(clause, bundle.add, regs);
1133 case BI_MINMAX:
1134 return bi_pack_add_addmin(bundle.add, regs);
1135 case BI_MOV:
1136 case BI_SHIFT:
1137 case BI_STORE:
1138 return BIFROST_ADD_NOP;
1139 case BI_STORE_VAR:
1140 return bi_pack_add_st_vary(clause, bundle.add, regs);
1141 case BI_SPECIAL:
1142 return bi_pack_add_special(bundle.add, regs);
1143 case BI_SWIZZLE:
1144 case BI_TEX:
1145 case BI_ROUND:
1146 return BIFROST_ADD_NOP;
1147 default:
1148 unreachable("Cannot encode class as ADD");
1149 }
1150 }
1151
1152 struct bi_packed_bundle {
1153 uint64_t lo;
1154 uint64_t hi;
1155 };
1156
1157 static struct bi_packed_bundle
1158 bi_pack_bundle(bi_clause *clause, bi_bundle bundle, bi_bundle prev, bool first_bundle)
1159 {
1160 struct bi_registers regs = bi_assign_ports(bundle, prev);
1161 bi_assign_uniform_constant(clause, &regs, bundle);
1162 regs.first_instruction = first_bundle;
1163
1164 uint64_t reg = bi_pack_registers(regs);
1165 uint64_t fma = bi_pack_fma(clause, bundle, &regs);
1166 uint64_t add = bi_pack_add(clause, bundle, &regs);
1167
1168 struct bi_packed_bundle packed = {
1169 .lo = reg | (fma << 35) | ((add & 0b111111) << 58),
1170 .hi = add >> 6
1171 };
1172
1173 return packed;
1174 }
1175
1176 /* Packs the next two constants as a dedicated constant quadword at the end of
1177 * the clause, returning the number packed. */
1178
1179 static unsigned
1180 bi_pack_constants(bi_context *ctx, bi_clause *clause,
1181 unsigned index,
1182 struct util_dynarray *emission)
1183 {
1184 /* After these two, are we done? Determines tag */
1185 bool done = clause->constant_count <= (index + 2);
1186 bool only = clause->constant_count <= (index + 1);
1187
1188 /* TODO: Pos */
1189 assert(index == 0 && clause->bundle_count == 1);
1190
1191 struct bifrost_fmt_constant quad = {
1192 .pos = 0, /* TODO */
1193 .tag = done ? BIFROST_FMTC_FINAL : BIFROST_FMTC_CONSTANTS,
1194 .imm_1 = clause->constants[index + 0] >> 4,
1195 .imm_2 = only ? 0 : clause->constants[index + 1] >> 4
1196 };
1197
1198 /* XXX: On G71, Connor observed that the difference of the top 4 bits
1199 * of the second constant with the first must be less than 8, otherwise
1200 * we have to swap them. I am not able to reproduce this on G52,
1201 * further investigation needed. Possibly an errata. XXX */
1202
1203 util_dynarray_append(emission, struct bifrost_fmt_constant, quad);
1204
1205 return 2;
1206 }
1207
1208 static void
1209 bi_pack_clause(bi_context *ctx, bi_clause *clause, bi_clause *next,
1210 struct util_dynarray *emission)
1211 {
1212 struct bi_packed_bundle ins_1 = bi_pack_bundle(clause, clause->bundles[0], clause->bundles[0], true);
1213 assert(clause->bundle_count == 1);
1214
1215 /* Used to decide if we elide writes */
1216 bool is_fragment = ctx->stage == MESA_SHADER_FRAGMENT;
1217
1218 /* State for packing constants throughout */
1219 unsigned constant_index = 0;
1220
1221 struct bifrost_fmt1 quad_1 = {
1222 .tag = clause->constant_count ? BIFROST_FMT1_CONSTANTS : BIFROST_FMT1_FINAL,
1223 .header = bi_pack_header(clause, next, is_fragment),
1224 .ins_1 = ins_1.lo,
1225 .ins_2 = ins_1.hi & ((1 << 11) - 1),
1226 .ins_0 = (ins_1.hi >> 11) & 0b111,
1227 };
1228
1229 util_dynarray_append(emission, struct bifrost_fmt1, quad_1);
1230
1231 /* Pack the remaining constants */
1232
1233 while (constant_index < clause->constant_count) {
1234 constant_index += bi_pack_constants(ctx, clause,
1235 constant_index, emission);
1236 }
1237 }
1238
1239 static bi_clause *
1240 bi_next_clause(bi_context *ctx, pan_block *block, bi_clause *clause)
1241 {
1242 /* Try the next clause in this block */
1243 if (clause->link.next != &((bi_block *) block)->clauses)
1244 return list_first_entry(&(clause->link), bi_clause, link);
1245
1246 /* Try the next block, or the one after that if it's empty, etc .*/
1247 pan_block *next_block = pan_next_block(block);
1248
1249 bi_foreach_block_from(ctx, next_block, block) {
1250 bi_block *blk = (bi_block *) block;
1251
1252 if (!list_is_empty(&blk->clauses))
1253 return list_first_entry(&(blk->clauses), bi_clause, link);
1254 }
1255
1256 return NULL;
1257 }
1258
1259 void
1260 bi_pack(bi_context *ctx, struct util_dynarray *emission)
1261 {
1262 util_dynarray_init(emission, NULL);
1263
1264 bi_foreach_block(ctx, _block) {
1265 bi_block *block = (bi_block *) _block;
1266
1267 bi_foreach_clause_in_block(block, clause) {
1268 bi_clause *next = bi_next_clause(ctx, _block, clause);
1269 bi_pack_clause(ctx, clause, next, emission);
1270 }
1271 }
1272 }