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[mesa.git] / src / mesa / drivers / dri / i965 / brw_eu_emit.c
1 /*
2 Copyright (C) Intel Corp. 2006. All Rights Reserved.
3 Intel funded Tungsten Graphics to
4 develop this 3D driver.
5
6 Permission is hereby granted, free of charge, to any person obtaining
7 a copy of this software and associated documentation files (the
8 "Software"), to deal in the Software without restriction, including
9 without limitation the rights to use, copy, modify, merge, publish,
10 distribute, sublicense, and/or sell copies of the Software, and to
11 permit persons to whom the Software is furnished to do so, subject to
12 the following conditions:
13
14 The above copyright notice and this permission notice (including the
15 next paragraph) shall be included in all copies or substantial
16 portions of the Software.
17
18 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
19 EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
20 MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
21 IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
22 LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
23 OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
24 WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
25
26 **********************************************************************/
27 /*
28 * Authors:
29 * Keith Whitwell <keithw@vmware.com>
30 */
31
32
33 #include "brw_context.h"
34 #include "brw_defines.h"
35 #include "brw_eu.h"
36
37 #include "util/ralloc.h"
38
39 /***********************************************************************
40 * Internal helper for constructing instructions
41 */
42
43 static void guess_execution_size(struct brw_compile *p,
44 brw_inst *insn,
45 struct brw_reg reg)
46 {
47 const struct brw_context *brw = p->brw;
48
49 if (reg.width == BRW_WIDTH_8 && p->compressed) {
50 brw_inst_set_exec_size(brw, insn, BRW_EXECUTE_16);
51 } else {
52 /* Register width definitions are compatible with BRW_EXECUTE_* enums. */
53 brw_inst_set_exec_size(brw, insn, reg.width);
54 }
55 }
56
57
58 /**
59 * Prior to Sandybridge, the SEND instruction accepted non-MRF source
60 * registers, implicitly moving the operand to a message register.
61 *
62 * On Sandybridge, this is no longer the case. This function performs the
63 * explicit move; it should be called before emitting a SEND instruction.
64 */
65 void
66 gen6_resolve_implied_move(struct brw_compile *p,
67 struct brw_reg *src,
68 unsigned msg_reg_nr)
69 {
70 struct brw_context *brw = p->brw;
71 if (brw->gen < 6)
72 return;
73
74 if (src->file == BRW_MESSAGE_REGISTER_FILE)
75 return;
76
77 if (src->file != BRW_ARCHITECTURE_REGISTER_FILE || src->nr != BRW_ARF_NULL) {
78 brw_push_insn_state(p);
79 brw_set_default_mask_control(p, BRW_MASK_DISABLE);
80 brw_set_default_compression_control(p, BRW_COMPRESSION_NONE);
81 brw_MOV(p, retype(brw_message_reg(msg_reg_nr), BRW_REGISTER_TYPE_UD),
82 retype(*src, BRW_REGISTER_TYPE_UD));
83 brw_pop_insn_state(p);
84 }
85 *src = brw_message_reg(msg_reg_nr);
86 }
87
88 static void
89 gen7_convert_mrf_to_grf(struct brw_compile *p, struct brw_reg *reg)
90 {
91 /* From the Ivybridge PRM, Volume 4 Part 3, page 218 ("send"):
92 * "The send with EOT should use register space R112-R127 for <src>. This is
93 * to enable loading of a new thread into the same slot while the message
94 * with EOT for current thread is pending dispatch."
95 *
96 * Since we're pretending to have 16 MRFs anyway, we may as well use the
97 * registers required for messages with EOT.
98 */
99 struct brw_context *brw = p->brw;
100 if (brw->gen >= 7 && reg->file == BRW_MESSAGE_REGISTER_FILE) {
101 reg->file = BRW_GENERAL_REGISTER_FILE;
102 reg->nr += GEN7_MRF_HACK_START;
103 }
104 }
105
106 /**
107 * Convert a brw_reg_type enumeration value into the hardware representation.
108 *
109 * The hardware encoding may depend on whether the value is an immediate.
110 */
111 unsigned
112 brw_reg_type_to_hw_type(const struct brw_context *brw,
113 enum brw_reg_type type, unsigned file)
114 {
115 if (file == BRW_IMMEDIATE_VALUE) {
116 const static int imm_hw_types[] = {
117 [BRW_REGISTER_TYPE_UD] = BRW_HW_REG_TYPE_UD,
118 [BRW_REGISTER_TYPE_D] = BRW_HW_REG_TYPE_D,
119 [BRW_REGISTER_TYPE_UW] = BRW_HW_REG_TYPE_UW,
120 [BRW_REGISTER_TYPE_W] = BRW_HW_REG_TYPE_W,
121 [BRW_REGISTER_TYPE_F] = BRW_HW_REG_TYPE_F,
122 [BRW_REGISTER_TYPE_UB] = -1,
123 [BRW_REGISTER_TYPE_B] = -1,
124 [BRW_REGISTER_TYPE_UV] = BRW_HW_REG_IMM_TYPE_UV,
125 [BRW_REGISTER_TYPE_VF] = BRW_HW_REG_IMM_TYPE_VF,
126 [BRW_REGISTER_TYPE_V] = BRW_HW_REG_IMM_TYPE_V,
127 [BRW_REGISTER_TYPE_DF] = GEN8_HW_REG_IMM_TYPE_DF,
128 [BRW_REGISTER_TYPE_HF] = GEN8_HW_REG_IMM_TYPE_HF,
129 [BRW_REGISTER_TYPE_UQ] = GEN8_HW_REG_TYPE_UQ,
130 [BRW_REGISTER_TYPE_Q] = GEN8_HW_REG_TYPE_Q,
131 };
132 assert(type < ARRAY_SIZE(imm_hw_types));
133 assert(imm_hw_types[type] != -1);
134 assert(brw->gen >= 8 || type < BRW_REGISTER_TYPE_DF);
135 return imm_hw_types[type];
136 } else {
137 /* Non-immediate registers */
138 const static int hw_types[] = {
139 [BRW_REGISTER_TYPE_UD] = BRW_HW_REG_TYPE_UD,
140 [BRW_REGISTER_TYPE_D] = BRW_HW_REG_TYPE_D,
141 [BRW_REGISTER_TYPE_UW] = BRW_HW_REG_TYPE_UW,
142 [BRW_REGISTER_TYPE_W] = BRW_HW_REG_TYPE_W,
143 [BRW_REGISTER_TYPE_UB] = BRW_HW_REG_NON_IMM_TYPE_UB,
144 [BRW_REGISTER_TYPE_B] = BRW_HW_REG_NON_IMM_TYPE_B,
145 [BRW_REGISTER_TYPE_F] = BRW_HW_REG_TYPE_F,
146 [BRW_REGISTER_TYPE_UV] = -1,
147 [BRW_REGISTER_TYPE_VF] = -1,
148 [BRW_REGISTER_TYPE_V] = -1,
149 [BRW_REGISTER_TYPE_DF] = GEN7_HW_REG_NON_IMM_TYPE_DF,
150 [BRW_REGISTER_TYPE_HF] = GEN8_HW_REG_NON_IMM_TYPE_HF,
151 [BRW_REGISTER_TYPE_UQ] = GEN8_HW_REG_TYPE_UQ,
152 [BRW_REGISTER_TYPE_Q] = GEN8_HW_REG_TYPE_Q,
153 };
154 assert(type < ARRAY_SIZE(hw_types));
155 assert(hw_types[type] != -1);
156 assert(brw->gen >= 7 || type < BRW_REGISTER_TYPE_DF);
157 assert(brw->gen >= 8 || type < BRW_REGISTER_TYPE_HF);
158 return hw_types[type];
159 }
160 }
161
162 void
163 brw_set_dest(struct brw_compile *p, brw_inst *inst, struct brw_reg dest)
164 {
165 const struct brw_context *brw = p->brw;
166
167 if (dest.file != BRW_ARCHITECTURE_REGISTER_FILE &&
168 dest.file != BRW_MESSAGE_REGISTER_FILE)
169 assert(dest.nr < 128);
170
171 gen7_convert_mrf_to_grf(p, &dest);
172
173 brw_inst_set_dst_reg_file(brw, inst, dest.file);
174 brw_inst_set_dst_reg_type(brw, inst, brw_reg_type_to_hw_type(brw, dest.type,
175 dest.file));
176 brw_inst_set_dst_address_mode(brw, inst, dest.address_mode);
177
178 if (dest.address_mode == BRW_ADDRESS_DIRECT) {
179 brw_inst_set_dst_da_reg_nr(brw, inst, dest.nr);
180
181 if (brw_inst_access_mode(brw, inst) == BRW_ALIGN_1) {
182 brw_inst_set_dst_da1_subreg_nr(brw, inst, dest.subnr);
183 if (dest.hstride == BRW_HORIZONTAL_STRIDE_0)
184 dest.hstride = BRW_HORIZONTAL_STRIDE_1;
185 brw_inst_set_dst_hstride(brw, inst, dest.hstride);
186 } else {
187 brw_inst_set_dst_da16_subreg_nr(brw, inst, dest.subnr / 16);
188 brw_inst_set_da16_writemask(brw, inst, dest.dw1.bits.writemask);
189 if (dest.file == BRW_GENERAL_REGISTER_FILE ||
190 dest.file == BRW_MESSAGE_REGISTER_FILE) {
191 assert(dest.dw1.bits.writemask != 0);
192 }
193 /* From the Ivybridge PRM, Vol 4, Part 3, Section 5.2.4.1:
194 * Although Dst.HorzStride is a don't care for Align16, HW needs
195 * this to be programmed as "01".
196 */
197 brw_inst_set_dst_hstride(brw, inst, 1);
198 }
199 } else {
200 brw_inst_set_dst_ia_subreg_nr(brw, inst, dest.subnr);
201
202 /* These are different sizes in align1 vs align16:
203 */
204 if (brw_inst_access_mode(brw, inst) == BRW_ALIGN_1) {
205 brw_inst_set_dst_ia1_addr_imm(brw, inst,
206 dest.dw1.bits.indirect_offset);
207 if (dest.hstride == BRW_HORIZONTAL_STRIDE_0)
208 dest.hstride = BRW_HORIZONTAL_STRIDE_1;
209 brw_inst_set_dst_hstride(brw, inst, dest.hstride);
210 } else {
211 brw_inst_set_dst_ia16_addr_imm(brw, inst,
212 dest.dw1.bits.indirect_offset);
213 /* even ignored in da16, still need to set as '01' */
214 brw_inst_set_dst_hstride(brw, inst, 1);
215 }
216 }
217
218 /* NEW: Set the execution size based on dest.width and
219 * inst->compression_control:
220 */
221 guess_execution_size(p, inst, dest);
222 }
223
224 extern int reg_type_size[];
225
226 static void
227 validate_reg(const struct brw_context *brw, brw_inst *inst, struct brw_reg reg)
228 {
229 int hstride_for_reg[] = {0, 1, 2, 4};
230 int vstride_for_reg[] = {0, 1, 2, 4, 8, 16, 32, 64, 128, 256};
231 int width_for_reg[] = {1, 2, 4, 8, 16};
232 int execsize_for_reg[] = {1, 2, 4, 8, 16};
233 int width, hstride, vstride, execsize;
234
235 if (reg.file == BRW_IMMEDIATE_VALUE) {
236 /* 3.3.6: Region Parameters. Restriction: Immediate vectors
237 * mean the destination has to be 128-bit aligned and the
238 * destination horiz stride has to be a word.
239 */
240 if (reg.type == BRW_REGISTER_TYPE_V) {
241 assert(hstride_for_reg[brw_inst_dst_hstride(brw, inst)] *
242 reg_type_size[brw_inst_dst_reg_type(brw, inst)] == 2);
243 }
244
245 return;
246 }
247
248 if (reg.file == BRW_ARCHITECTURE_REGISTER_FILE &&
249 reg.file == BRW_ARF_NULL)
250 return;
251
252 assert(reg.hstride >= 0 && reg.hstride < Elements(hstride_for_reg));
253 hstride = hstride_for_reg[reg.hstride];
254
255 if (reg.vstride == 0xf) {
256 vstride = -1;
257 } else {
258 assert(reg.vstride >= 0 && reg.vstride < Elements(vstride_for_reg));
259 vstride = vstride_for_reg[reg.vstride];
260 }
261
262 assert(reg.width >= 0 && reg.width < Elements(width_for_reg));
263 width = width_for_reg[reg.width];
264
265 assert(brw_inst_exec_size(brw, inst) >= 0 &&
266 brw_inst_exec_size(brw, inst) < Elements(execsize_for_reg));
267 execsize = execsize_for_reg[brw_inst_exec_size(brw, inst)];
268
269 /* Restrictions from 3.3.10: Register Region Restrictions. */
270 /* 3. */
271 assert(execsize >= width);
272
273 /* 4. */
274 if (execsize == width && hstride != 0) {
275 assert(vstride == -1 || vstride == width * hstride);
276 }
277
278 /* 5. */
279 if (execsize == width && hstride == 0) {
280 /* no restriction on vstride. */
281 }
282
283 /* 6. */
284 if (width == 1) {
285 assert(hstride == 0);
286 }
287
288 /* 7. */
289 if (execsize == 1 && width == 1) {
290 assert(hstride == 0);
291 assert(vstride == 0);
292 }
293
294 /* 8. */
295 if (vstride == 0 && hstride == 0) {
296 assert(width == 1);
297 }
298
299 /* 10. Check destination issues. */
300 }
301
302 static bool
303 is_compactable_immediate(unsigned imm)
304 {
305 /* We get the low 12 bits as-is. */
306 imm &= ~0xfff;
307
308 /* We get one bit replicated through the top 20 bits. */
309 return imm == 0 || imm == 0xfffff000;
310 }
311
312 void
313 brw_set_src0(struct brw_compile *p, brw_inst *inst, struct brw_reg reg)
314 {
315 struct brw_context *brw = p->brw;
316
317 if (reg.file != BRW_ARCHITECTURE_REGISTER_FILE)
318 assert(reg.nr < 128);
319
320 gen7_convert_mrf_to_grf(p, &reg);
321
322 if (brw->gen >= 6 && (brw_inst_opcode(brw, inst) == BRW_OPCODE_SEND ||
323 brw_inst_opcode(brw, inst) == BRW_OPCODE_SENDC)) {
324 /* Any source modifiers or regions will be ignored, since this just
325 * identifies the MRF/GRF to start reading the message contents from.
326 * Check for some likely failures.
327 */
328 assert(!reg.negate);
329 assert(!reg.abs);
330 assert(reg.address_mode == BRW_ADDRESS_DIRECT);
331 }
332
333 validate_reg(brw, inst, reg);
334
335 brw_inst_set_src0_reg_file(brw, inst, reg.file);
336 brw_inst_set_src0_reg_type(brw, inst,
337 brw_reg_type_to_hw_type(brw, reg.type, reg.file));
338 brw_inst_set_src0_abs(brw, inst, reg.abs);
339 brw_inst_set_src0_negate(brw, inst, reg.negate);
340 brw_inst_set_src0_address_mode(brw, inst, reg.address_mode);
341
342 if (reg.file == BRW_IMMEDIATE_VALUE) {
343 brw_inst_set_imm_ud(brw, inst, reg.dw1.ud);
344
345 /* The Bspec's section titled "Non-present Operands" claims that if src0
346 * is an immediate that src1's type must be the same as that of src0.
347 *
348 * The SNB+ DataTypeIndex instruction compaction tables contain mappings
349 * that do not follow this rule. E.g., from the IVB/HSW table:
350 *
351 * DataTypeIndex 18-Bit Mapping Mapped Meaning
352 * 3 001000001011111101 r:f | i:vf | a:ud | <1> | dir |
353 *
354 * And from the SNB table:
355 *
356 * DataTypeIndex 18-Bit Mapping Mapped Meaning
357 * 8 001000000111101100 a:w | i:w | a:ud | <1> | dir |
358 *
359 * Neither of these cause warnings from the simulator when used,
360 * compacted or otherwise. In fact, all compaction mappings that have an
361 * immediate in src0 use a:ud for src1.
362 *
363 * The GM45 instruction compaction tables do not contain mapped meanings
364 * so it's not clear whether it has the restriction. We'll assume it was
365 * lifted on SNB. (FINISHME: decode the GM45 tables and check.)
366 */
367 brw_inst_set_src1_reg_file(brw, inst, BRW_ARCHITECTURE_REGISTER_FILE);
368 if (brw->gen < 6) {
369 brw_inst_set_src1_reg_type(brw, inst,
370 brw_inst_src0_reg_type(brw, inst));
371 } else {
372 brw_inst_set_src1_reg_type(brw, inst, BRW_HW_REG_TYPE_UD);
373 }
374
375 /* Compacted instructions only have 12-bits (plus 1 for the other 20)
376 * for immediate values. Presumably the hardware engineers realized
377 * that the only useful floating-point value that could be represented
378 * in this format is 0.0, which can also be represented as a VF-typed
379 * immediate, so they gave us the previously mentioned mapping on IVB+.
380 *
381 * Strangely, we do have a mapping for imm:f in src1, so we don't need
382 * to do this there.
383 *
384 * If we see a 0.0:F, change the type to VF so that it can be compacted.
385 */
386 if (brw_inst_imm_ud(brw, inst) == 0x0 &&
387 brw_inst_src0_reg_type(brw, inst) == BRW_HW_REG_TYPE_F) {
388 brw_inst_set_src0_reg_type(brw, inst, BRW_HW_REG_IMM_TYPE_VF);
389 }
390
391 /* There are no mappings for dst:d | i:d, so if the immediate is suitable
392 * set the types to :UD so the instruction can be compacted.
393 */
394 if (is_compactable_immediate(brw_inst_imm_ud(brw, inst)) &&
395 brw_inst_cond_modifier(brw, inst) == BRW_CONDITIONAL_NONE &&
396 brw_inst_src0_reg_type(brw, inst) == BRW_HW_REG_TYPE_D &&
397 brw_inst_dst_reg_type(brw, inst) == BRW_HW_REG_TYPE_D) {
398 brw_inst_set_src0_reg_type(brw, inst, BRW_HW_REG_TYPE_UD);
399 brw_inst_set_dst_reg_type(brw, inst, BRW_HW_REG_TYPE_UD);
400 }
401 } else {
402 if (reg.address_mode == BRW_ADDRESS_DIRECT) {
403 brw_inst_set_src0_da_reg_nr(brw, inst, reg.nr);
404 if (brw_inst_access_mode(brw, inst) == BRW_ALIGN_1) {
405 brw_inst_set_src0_da1_subreg_nr(brw, inst, reg.subnr);
406 } else {
407 brw_inst_set_src0_da16_subreg_nr(brw, inst, reg.subnr / 16);
408 }
409 } else {
410 brw_inst_set_src0_ia_subreg_nr(brw, inst, reg.subnr);
411
412 if (brw_inst_access_mode(brw, inst) == BRW_ALIGN_1) {
413 brw_inst_set_src0_ia1_addr_imm(brw, inst, reg.dw1.bits.indirect_offset);
414 } else {
415 brw_inst_set_src0_ia_subreg_nr(brw, inst, reg.dw1.bits.indirect_offset);
416 }
417 }
418
419 if (brw_inst_access_mode(brw, inst) == BRW_ALIGN_1) {
420 if (reg.width == BRW_WIDTH_1 &&
421 brw_inst_exec_size(brw, inst) == BRW_EXECUTE_1) {
422 brw_inst_set_src0_hstride(brw, inst, BRW_HORIZONTAL_STRIDE_0);
423 brw_inst_set_src0_width(brw, inst, BRW_WIDTH_1);
424 brw_inst_set_src0_vstride(brw, inst, BRW_VERTICAL_STRIDE_0);
425 } else {
426 brw_inst_set_src0_hstride(brw, inst, reg.hstride);
427 brw_inst_set_src0_width(brw, inst, reg.width);
428 brw_inst_set_src0_vstride(brw, inst, reg.vstride);
429 }
430 } else {
431 brw_inst_set_src0_da16_swiz_x(brw, inst,
432 BRW_GET_SWZ(reg.dw1.bits.swizzle, BRW_CHANNEL_X));
433 brw_inst_set_src0_da16_swiz_y(brw, inst,
434 BRW_GET_SWZ(reg.dw1.bits.swizzle, BRW_CHANNEL_Y));
435 brw_inst_set_src0_da16_swiz_z(brw, inst,
436 BRW_GET_SWZ(reg.dw1.bits.swizzle, BRW_CHANNEL_Z));
437 brw_inst_set_src0_da16_swiz_w(brw, inst,
438 BRW_GET_SWZ(reg.dw1.bits.swizzle, BRW_CHANNEL_W));
439
440 /* This is an oddity of the fact we're using the same
441 * descriptions for registers in align_16 as align_1:
442 */
443 if (reg.vstride == BRW_VERTICAL_STRIDE_8)
444 brw_inst_set_src0_vstride(brw, inst, BRW_VERTICAL_STRIDE_4);
445 else
446 brw_inst_set_src0_vstride(brw, inst, reg.vstride);
447 }
448 }
449 }
450
451
452 void
453 brw_set_src1(struct brw_compile *p, brw_inst *inst, struct brw_reg reg)
454 {
455 const struct brw_context *brw = p->brw;
456 assert(reg.file != BRW_MESSAGE_REGISTER_FILE);
457
458 if (reg.file != BRW_ARCHITECTURE_REGISTER_FILE)
459 assert(reg.nr < 128);
460
461 gen7_convert_mrf_to_grf(p, &reg);
462
463 validate_reg(brw, inst, reg);
464
465 brw_inst_set_src1_reg_file(brw, inst, reg.file);
466 brw_inst_set_src1_reg_type(brw, inst,
467 brw_reg_type_to_hw_type(brw, reg.type, reg.file));
468 brw_inst_set_src1_abs(brw, inst, reg.abs);
469 brw_inst_set_src1_negate(brw, inst, reg.negate);
470
471 /* Only src1 can be immediate in two-argument instructions.
472 */
473 assert(brw_inst_src0_reg_file(brw, inst) != BRW_IMMEDIATE_VALUE);
474
475 if (reg.file == BRW_IMMEDIATE_VALUE) {
476 brw_inst_set_imm_ud(brw, inst, reg.dw1.ud);
477 } else {
478 /* This is a hardware restriction, which may or may not be lifted
479 * in the future:
480 */
481 assert (reg.address_mode == BRW_ADDRESS_DIRECT);
482 /* assert (reg.file == BRW_GENERAL_REGISTER_FILE); */
483
484 brw_inst_set_src1_da_reg_nr(brw, inst, reg.nr);
485 if (brw_inst_access_mode(brw, inst) == BRW_ALIGN_1) {
486 brw_inst_set_src1_da1_subreg_nr(brw, inst, reg.subnr);
487 } else {
488 brw_inst_set_src1_da16_subreg_nr(brw, inst, reg.subnr / 16);
489 }
490
491 if (brw_inst_access_mode(brw, inst) == BRW_ALIGN_1) {
492 if (reg.width == BRW_WIDTH_1 &&
493 brw_inst_exec_size(brw, inst) == BRW_EXECUTE_1) {
494 brw_inst_set_src1_hstride(brw, inst, BRW_HORIZONTAL_STRIDE_0);
495 brw_inst_set_src1_width(brw, inst, BRW_WIDTH_1);
496 brw_inst_set_src1_vstride(brw, inst, BRW_VERTICAL_STRIDE_0);
497 } else {
498 brw_inst_set_src1_hstride(brw, inst, reg.hstride);
499 brw_inst_set_src1_width(brw, inst, reg.width);
500 brw_inst_set_src1_vstride(brw, inst, reg.vstride);
501 }
502 } else {
503 brw_inst_set_src1_da16_swiz_x(brw, inst,
504 BRW_GET_SWZ(reg.dw1.bits.swizzle, BRW_CHANNEL_X));
505 brw_inst_set_src1_da16_swiz_y(brw, inst,
506 BRW_GET_SWZ(reg.dw1.bits.swizzle, BRW_CHANNEL_Y));
507 brw_inst_set_src1_da16_swiz_z(brw, inst,
508 BRW_GET_SWZ(reg.dw1.bits.swizzle, BRW_CHANNEL_Z));
509 brw_inst_set_src1_da16_swiz_w(brw, inst,
510 BRW_GET_SWZ(reg.dw1.bits.swizzle, BRW_CHANNEL_W));
511
512 /* This is an oddity of the fact we're using the same
513 * descriptions for registers in align_16 as align_1:
514 */
515 if (reg.vstride == BRW_VERTICAL_STRIDE_8)
516 brw_inst_set_src1_vstride(brw, inst, BRW_VERTICAL_STRIDE_4);
517 else
518 brw_inst_set_src1_vstride(brw, inst, reg.vstride);
519 }
520 }
521 }
522
523 /**
524 * Set the Message Descriptor and Extended Message Descriptor fields
525 * for SEND messages.
526 *
527 * \note This zeroes out the Function Control bits, so it must be called
528 * \b before filling out any message-specific data. Callers can
529 * choose not to fill in irrelevant bits; they will be zero.
530 */
531 static void
532 brw_set_message_descriptor(struct brw_compile *p,
533 brw_inst *inst,
534 enum brw_message_target sfid,
535 unsigned msg_length,
536 unsigned response_length,
537 bool header_present,
538 bool end_of_thread)
539 {
540 struct brw_context *brw = p->brw;
541
542 brw_set_src1(p, inst, brw_imm_d(0));
543 brw_inst_set_sfid(brw, inst, sfid);
544 brw_inst_set_mlen(brw, inst, msg_length);
545 brw_inst_set_rlen(brw, inst, response_length);
546 brw_inst_set_eot(brw, inst, end_of_thread);
547
548 if (brw->gen >= 5) {
549 brw_inst_set_header_present(brw, inst, header_present);
550 }
551 }
552
553 static void brw_set_math_message( struct brw_compile *p,
554 brw_inst *inst,
555 unsigned function,
556 unsigned integer_type,
557 bool low_precision,
558 unsigned dataType )
559 {
560 struct brw_context *brw = p->brw;
561 unsigned msg_length;
562 unsigned response_length;
563
564 /* Infer message length from the function */
565 switch (function) {
566 case BRW_MATH_FUNCTION_POW:
567 case BRW_MATH_FUNCTION_INT_DIV_QUOTIENT:
568 case BRW_MATH_FUNCTION_INT_DIV_REMAINDER:
569 case BRW_MATH_FUNCTION_INT_DIV_QUOTIENT_AND_REMAINDER:
570 msg_length = 2;
571 break;
572 default:
573 msg_length = 1;
574 break;
575 }
576
577 /* Infer response length from the function */
578 switch (function) {
579 case BRW_MATH_FUNCTION_SINCOS:
580 case BRW_MATH_FUNCTION_INT_DIV_QUOTIENT_AND_REMAINDER:
581 response_length = 2;
582 break;
583 default:
584 response_length = 1;
585 break;
586 }
587
588
589 brw_set_message_descriptor(p, inst, BRW_SFID_MATH,
590 msg_length, response_length, false, false);
591 brw_inst_set_math_msg_function(brw, inst, function);
592 brw_inst_set_math_msg_signed_int(brw, inst, integer_type);
593 brw_inst_set_math_msg_precision(brw, inst, low_precision);
594 brw_inst_set_math_msg_saturate(brw, inst, brw_inst_saturate(brw, inst));
595 brw_inst_set_math_msg_data_type(brw, inst, dataType);
596 brw_inst_set_saturate(brw, inst, 0);
597 }
598
599
600 static void brw_set_ff_sync_message(struct brw_compile *p,
601 brw_inst *insn,
602 bool allocate,
603 unsigned response_length,
604 bool end_of_thread)
605 {
606 const struct brw_context *brw = p->brw;
607
608 brw_set_message_descriptor(p, insn, BRW_SFID_URB,
609 1, response_length, true, end_of_thread);
610 brw_inst_set_urb_opcode(brw, insn, 1); /* FF_SYNC */
611 brw_inst_set_urb_allocate(brw, insn, allocate);
612 /* The following fields are not used by FF_SYNC: */
613 brw_inst_set_urb_global_offset(brw, insn, 0);
614 brw_inst_set_urb_swizzle_control(brw, insn, 0);
615 brw_inst_set_urb_used(brw, insn, 0);
616 brw_inst_set_urb_complete(brw, insn, 0);
617 }
618
619 static void brw_set_urb_message( struct brw_compile *p,
620 brw_inst *insn,
621 enum brw_urb_write_flags flags,
622 unsigned msg_length,
623 unsigned response_length,
624 unsigned offset,
625 unsigned swizzle_control )
626 {
627 struct brw_context *brw = p->brw;
628
629 assert(brw->gen < 7 || swizzle_control != BRW_URB_SWIZZLE_TRANSPOSE);
630 assert(brw->gen < 7 || !(flags & BRW_URB_WRITE_ALLOCATE));
631 assert(brw->gen >= 7 || !(flags & BRW_URB_WRITE_PER_SLOT_OFFSET));
632
633 brw_set_message_descriptor(p, insn, BRW_SFID_URB,
634 msg_length, response_length, true,
635 flags & BRW_URB_WRITE_EOT);
636
637 if (flags & BRW_URB_WRITE_OWORD) {
638 assert(msg_length == 2); /* header + one OWORD of data */
639 brw_inst_set_urb_opcode(brw, insn, BRW_URB_OPCODE_WRITE_OWORD);
640 } else {
641 brw_inst_set_urb_opcode(brw, insn, BRW_URB_OPCODE_WRITE_HWORD);
642 }
643
644 brw_inst_set_urb_global_offset(brw, insn, offset);
645 brw_inst_set_urb_swizzle_control(brw, insn, swizzle_control);
646
647 if (brw->gen < 8) {
648 brw_inst_set_urb_complete(brw, insn, !!(flags & BRW_URB_WRITE_COMPLETE));
649 }
650
651 if (brw->gen < 7) {
652 brw_inst_set_urb_allocate(brw, insn, !!(flags & BRW_URB_WRITE_ALLOCATE));
653 brw_inst_set_urb_used(brw, insn, !(flags & BRW_URB_WRITE_UNUSED));
654 } else {
655 brw_inst_set_urb_per_slot_offset(brw, insn,
656 !!(flags & BRW_URB_WRITE_PER_SLOT_OFFSET));
657 }
658 }
659
660 void
661 brw_set_dp_write_message(struct brw_compile *p,
662 brw_inst *insn,
663 unsigned binding_table_index,
664 unsigned msg_control,
665 unsigned msg_type,
666 unsigned msg_length,
667 bool header_present,
668 unsigned last_render_target,
669 unsigned response_length,
670 unsigned end_of_thread,
671 unsigned send_commit_msg)
672 {
673 struct brw_context *brw = p->brw;
674 unsigned sfid;
675
676 if (brw->gen >= 7) {
677 /* Use the Render Cache for RT writes; otherwise use the Data Cache */
678 if (msg_type == GEN6_DATAPORT_WRITE_MESSAGE_RENDER_TARGET_WRITE)
679 sfid = GEN6_SFID_DATAPORT_RENDER_CACHE;
680 else
681 sfid = GEN7_SFID_DATAPORT_DATA_CACHE;
682 } else if (brw->gen == 6) {
683 /* Use the render cache for all write messages. */
684 sfid = GEN6_SFID_DATAPORT_RENDER_CACHE;
685 } else {
686 sfid = BRW_SFID_DATAPORT_WRITE;
687 }
688
689 brw_set_message_descriptor(p, insn, sfid, msg_length, response_length,
690 header_present, end_of_thread);
691
692 brw_inst_set_binding_table_index(brw, insn, binding_table_index);
693 brw_inst_set_dp_write_msg_type(brw, insn, msg_type);
694 brw_inst_set_dp_write_msg_control(brw, insn, msg_control);
695 brw_inst_set_rt_last(brw, insn, last_render_target);
696 if (brw->gen < 7) {
697 brw_inst_set_dp_write_commit(brw, insn, send_commit_msg);
698 }
699 }
700
701 void
702 brw_set_dp_read_message(struct brw_compile *p,
703 brw_inst *insn,
704 unsigned binding_table_index,
705 unsigned msg_control,
706 unsigned msg_type,
707 unsigned target_cache,
708 unsigned msg_length,
709 bool header_present,
710 unsigned response_length)
711 {
712 struct brw_context *brw = p->brw;
713 unsigned sfid;
714
715 if (brw->gen >= 7) {
716 sfid = GEN7_SFID_DATAPORT_DATA_CACHE;
717 } else if (brw->gen == 6) {
718 if (target_cache == BRW_DATAPORT_READ_TARGET_RENDER_CACHE)
719 sfid = GEN6_SFID_DATAPORT_RENDER_CACHE;
720 else
721 sfid = GEN6_SFID_DATAPORT_SAMPLER_CACHE;
722 } else {
723 sfid = BRW_SFID_DATAPORT_READ;
724 }
725
726 brw_set_message_descriptor(p, insn, sfid, msg_length, response_length,
727 header_present, false);
728
729 brw_inst_set_binding_table_index(brw, insn, binding_table_index);
730 brw_inst_set_dp_read_msg_type(brw, insn, msg_type);
731 brw_inst_set_dp_read_msg_control(brw, insn, msg_control);
732 if (brw->gen < 6)
733 brw_inst_set_dp_read_target_cache(brw, insn, target_cache);
734 }
735
736 void
737 brw_set_sampler_message(struct brw_compile *p,
738 brw_inst *inst,
739 unsigned binding_table_index,
740 unsigned sampler,
741 unsigned msg_type,
742 unsigned response_length,
743 unsigned msg_length,
744 unsigned header_present,
745 unsigned simd_mode,
746 unsigned return_format)
747 {
748 struct brw_context *brw = p->brw;
749
750 brw_set_message_descriptor(p, inst, BRW_SFID_SAMPLER, msg_length,
751 response_length, header_present, false);
752
753 brw_inst_set_binding_table_index(brw, inst, binding_table_index);
754 brw_inst_set_sampler(brw, inst, sampler);
755 brw_inst_set_sampler_msg_type(brw, inst, msg_type);
756 if (brw->gen >= 5) {
757 brw_inst_set_sampler_simd_mode(brw, inst, simd_mode);
758 } else if (brw->gen == 4 && !brw->is_g4x) {
759 brw_inst_set_sampler_return_format(brw, inst, return_format);
760 }
761 }
762
763 static void
764 gen7_set_dp_scratch_message(struct brw_compile *p,
765 brw_inst *inst,
766 bool write,
767 bool dword,
768 bool invalidate_after_read,
769 unsigned num_regs,
770 unsigned addr_offset,
771 unsigned mlen,
772 unsigned rlen,
773 bool header_present)
774 {
775 const struct brw_context *brw = p->brw;
776 assert(num_regs == 1 || num_regs == 2 || num_regs == 4 ||
777 (brw->gen >= 8 && num_regs == 8));
778 brw_set_message_descriptor(p, inst, GEN7_SFID_DATAPORT_DATA_CACHE,
779 mlen, rlen, header_present, false);
780 brw_inst_set_dp_category(brw, inst, 1); /* Scratch Block Read/Write msgs */
781 brw_inst_set_scratch_read_write(brw, inst, write);
782 brw_inst_set_scratch_type(brw, inst, dword);
783 brw_inst_set_scratch_invalidate_after_read(brw, inst, invalidate_after_read);
784 brw_inst_set_scratch_block_size(brw, inst, ffs(num_regs) - 1);
785 brw_inst_set_scratch_addr_offset(brw, inst, addr_offset);
786 }
787
788 #define next_insn brw_next_insn
789 brw_inst *
790 brw_next_insn(struct brw_compile *p, unsigned opcode)
791 {
792 const struct brw_context *brw = p->brw;
793 brw_inst *insn;
794
795 if (p->nr_insn + 1 > p->store_size) {
796 p->store_size <<= 1;
797 p->store = reralloc(p->mem_ctx, p->store, brw_inst, p->store_size);
798 }
799
800 p->next_insn_offset += 16;
801 insn = &p->store[p->nr_insn++];
802 memcpy(insn, p->current, sizeof(*insn));
803
804 brw_inst_set_opcode(brw, insn, opcode);
805 return insn;
806 }
807
808 static brw_inst *
809 brw_alu1(struct brw_compile *p, unsigned opcode,
810 struct brw_reg dest, struct brw_reg src)
811 {
812 brw_inst *insn = next_insn(p, opcode);
813 brw_set_dest(p, insn, dest);
814 brw_set_src0(p, insn, src);
815 return insn;
816 }
817
818 static brw_inst *
819 brw_alu2(struct brw_compile *p, unsigned opcode,
820 struct brw_reg dest, struct brw_reg src0, struct brw_reg src1)
821 {
822 brw_inst *insn = next_insn(p, opcode);
823 brw_set_dest(p, insn, dest);
824 brw_set_src0(p, insn, src0);
825 brw_set_src1(p, insn, src1);
826 return insn;
827 }
828
829 static int
830 get_3src_subreg_nr(struct brw_reg reg)
831 {
832 if (reg.vstride == BRW_VERTICAL_STRIDE_0) {
833 assert(brw_is_single_value_swizzle(reg.dw1.bits.swizzle));
834 return reg.subnr / 4 + BRW_GET_SWZ(reg.dw1.bits.swizzle, 0);
835 } else {
836 return reg.subnr / 4;
837 }
838 }
839
840 static brw_inst *
841 brw_alu3(struct brw_compile *p, unsigned opcode, struct brw_reg dest,
842 struct brw_reg src0, struct brw_reg src1, struct brw_reg src2)
843 {
844 struct brw_context *brw = p->brw;
845 brw_inst *inst = next_insn(p, opcode);
846
847 gen7_convert_mrf_to_grf(p, &dest);
848
849 assert(brw_inst_access_mode(brw, inst) == BRW_ALIGN_16);
850
851 assert(dest.file == BRW_GENERAL_REGISTER_FILE ||
852 dest.file == BRW_MESSAGE_REGISTER_FILE);
853 assert(dest.nr < 128);
854 assert(dest.address_mode == BRW_ADDRESS_DIRECT);
855 assert(dest.type == BRW_REGISTER_TYPE_F ||
856 dest.type == BRW_REGISTER_TYPE_D ||
857 dest.type == BRW_REGISTER_TYPE_UD);
858 if (brw->gen == 6) {
859 brw_inst_set_3src_dst_reg_file(brw, inst,
860 dest.file == BRW_MESSAGE_REGISTER_FILE);
861 }
862 brw_inst_set_3src_dst_reg_nr(brw, inst, dest.nr);
863 brw_inst_set_3src_dst_subreg_nr(brw, inst, dest.subnr / 16);
864 brw_inst_set_3src_dst_writemask(brw, inst, dest.dw1.bits.writemask);
865 guess_execution_size(p, inst, dest);
866
867 assert(src0.file == BRW_GENERAL_REGISTER_FILE);
868 assert(src0.address_mode == BRW_ADDRESS_DIRECT);
869 assert(src0.nr < 128);
870 brw_inst_set_3src_src0_swizzle(brw, inst, src0.dw1.bits.swizzle);
871 brw_inst_set_3src_src0_subreg_nr(brw, inst, get_3src_subreg_nr(src0));
872 brw_inst_set_3src_src0_reg_nr(brw, inst, src0.nr);
873 brw_inst_set_3src_src0_abs(brw, inst, src0.abs);
874 brw_inst_set_3src_src0_negate(brw, inst, src0.negate);
875 brw_inst_set_3src_src0_rep_ctrl(brw, inst,
876 src0.vstride == BRW_VERTICAL_STRIDE_0);
877
878 assert(src1.file == BRW_GENERAL_REGISTER_FILE);
879 assert(src1.address_mode == BRW_ADDRESS_DIRECT);
880 assert(src1.nr < 128);
881 brw_inst_set_3src_src1_swizzle(brw, inst, src1.dw1.bits.swizzle);
882 brw_inst_set_3src_src1_subreg_nr(brw, inst, get_3src_subreg_nr(src1));
883 brw_inst_set_3src_src1_reg_nr(brw, inst, src1.nr);
884 brw_inst_set_3src_src1_abs(brw, inst, src1.abs);
885 brw_inst_set_3src_src1_negate(brw, inst, src1.negate);
886 brw_inst_set_3src_src1_rep_ctrl(brw, inst,
887 src1.vstride == BRW_VERTICAL_STRIDE_0);
888
889 assert(src2.file == BRW_GENERAL_REGISTER_FILE);
890 assert(src2.address_mode == BRW_ADDRESS_DIRECT);
891 assert(src2.nr < 128);
892 brw_inst_set_3src_src2_swizzle(brw, inst, src2.dw1.bits.swizzle);
893 brw_inst_set_3src_src2_subreg_nr(brw, inst, get_3src_subreg_nr(src2));
894 brw_inst_set_3src_src2_reg_nr(brw, inst, src2.nr);
895 brw_inst_set_3src_src2_abs(brw, inst, src2.abs);
896 brw_inst_set_3src_src2_negate(brw, inst, src2.negate);
897 brw_inst_set_3src_src2_rep_ctrl(brw, inst,
898 src2.vstride == BRW_VERTICAL_STRIDE_0);
899
900 if (brw->gen >= 7) {
901 /* Set both the source and destination types based on dest.type,
902 * ignoring the source register types. The MAD and LRP emitters ensure
903 * that all four types are float. The BFE and BFI2 emitters, however,
904 * may send us mixed D and UD types and want us to ignore that and use
905 * the destination type.
906 */
907 switch (dest.type) {
908 case BRW_REGISTER_TYPE_F:
909 brw_inst_set_3src_src_type(brw, inst, BRW_3SRC_TYPE_F);
910 brw_inst_set_3src_dst_type(brw, inst, BRW_3SRC_TYPE_F);
911 break;
912 case BRW_REGISTER_TYPE_D:
913 brw_inst_set_3src_src_type(brw, inst, BRW_3SRC_TYPE_D);
914 brw_inst_set_3src_dst_type(brw, inst, BRW_3SRC_TYPE_D);
915 break;
916 case BRW_REGISTER_TYPE_UD:
917 brw_inst_set_3src_src_type(brw, inst, BRW_3SRC_TYPE_UD);
918 brw_inst_set_3src_dst_type(brw, inst, BRW_3SRC_TYPE_UD);
919 break;
920 }
921 }
922
923 return inst;
924 }
925
926
927 /***********************************************************************
928 * Convenience routines.
929 */
930 #define ALU1(OP) \
931 brw_inst *brw_##OP(struct brw_compile *p, \
932 struct brw_reg dest, \
933 struct brw_reg src0) \
934 { \
935 return brw_alu1(p, BRW_OPCODE_##OP, dest, src0); \
936 }
937
938 #define ALU2(OP) \
939 brw_inst *brw_##OP(struct brw_compile *p, \
940 struct brw_reg dest, \
941 struct brw_reg src0, \
942 struct brw_reg src1) \
943 { \
944 return brw_alu2(p, BRW_OPCODE_##OP, dest, src0, src1); \
945 }
946
947 #define ALU3(OP) \
948 brw_inst *brw_##OP(struct brw_compile *p, \
949 struct brw_reg dest, \
950 struct brw_reg src0, \
951 struct brw_reg src1, \
952 struct brw_reg src2) \
953 { \
954 return brw_alu3(p, BRW_OPCODE_##OP, dest, src0, src1, src2); \
955 }
956
957 #define ALU3F(OP) \
958 brw_inst *brw_##OP(struct brw_compile *p, \
959 struct brw_reg dest, \
960 struct brw_reg src0, \
961 struct brw_reg src1, \
962 struct brw_reg src2) \
963 { \
964 assert(dest.type == BRW_REGISTER_TYPE_F); \
965 assert(src0.type == BRW_REGISTER_TYPE_F); \
966 assert(src1.type == BRW_REGISTER_TYPE_F); \
967 assert(src2.type == BRW_REGISTER_TYPE_F); \
968 return brw_alu3(p, BRW_OPCODE_##OP, dest, src0, src1, src2); \
969 }
970
971 /* Rounding operations (other than RNDD) require two instructions - the first
972 * stores a rounded value (possibly the wrong way) in the dest register, but
973 * also sets a per-channel "increment bit" in the flag register. A predicated
974 * add of 1.0 fixes dest to contain the desired result.
975 *
976 * Sandybridge and later appear to round correctly without an ADD.
977 */
978 #define ROUND(OP) \
979 void brw_##OP(struct brw_compile *p, \
980 struct brw_reg dest, \
981 struct brw_reg src) \
982 { \
983 struct brw_context *brw = p->brw; \
984 brw_inst *rnd, *add; \
985 rnd = next_insn(p, BRW_OPCODE_##OP); \
986 brw_set_dest(p, rnd, dest); \
987 brw_set_src0(p, rnd, src); \
988 \
989 if (brw->gen < 6) { \
990 /* turn on round-increments */ \
991 brw_inst_set_cond_modifier(brw, rnd, BRW_CONDITIONAL_R); \
992 add = brw_ADD(p, dest, dest, brw_imm_f(1.0f)); \
993 brw_inst_set_pred_control(brw, add, BRW_PREDICATE_NORMAL); \
994 } \
995 }
996
997
998 ALU1(MOV)
999 ALU2(SEL)
1000 ALU1(NOT)
1001 ALU2(AND)
1002 ALU2(OR)
1003 ALU2(XOR)
1004 ALU2(SHR)
1005 ALU2(SHL)
1006 ALU2(ASR)
1007 ALU1(F32TO16)
1008 ALU1(F16TO32)
1009 ALU1(FRC)
1010 ALU1(RNDD)
1011 ALU2(MAC)
1012 ALU2(MACH)
1013 ALU1(LZD)
1014 ALU2(DP4)
1015 ALU2(DPH)
1016 ALU2(DP3)
1017 ALU2(DP2)
1018 ALU2(LINE)
1019 ALU2(PLN)
1020 ALU3F(MAD)
1021 ALU3F(LRP)
1022 ALU1(BFREV)
1023 ALU3(BFE)
1024 ALU2(BFI1)
1025 ALU3(BFI2)
1026 ALU1(FBH)
1027 ALU1(FBL)
1028 ALU1(CBIT)
1029 ALU2(ADDC)
1030 ALU2(SUBB)
1031
1032 ROUND(RNDZ)
1033 ROUND(RNDE)
1034
1035
1036 brw_inst *
1037 brw_ADD(struct brw_compile *p, struct brw_reg dest,
1038 struct brw_reg src0, struct brw_reg src1)
1039 {
1040 /* 6.2.2: add */
1041 if (src0.type == BRW_REGISTER_TYPE_F ||
1042 (src0.file == BRW_IMMEDIATE_VALUE &&
1043 src0.type == BRW_REGISTER_TYPE_VF)) {
1044 assert(src1.type != BRW_REGISTER_TYPE_UD);
1045 assert(src1.type != BRW_REGISTER_TYPE_D);
1046 }
1047
1048 if (src1.type == BRW_REGISTER_TYPE_F ||
1049 (src1.file == BRW_IMMEDIATE_VALUE &&
1050 src1.type == BRW_REGISTER_TYPE_VF)) {
1051 assert(src0.type != BRW_REGISTER_TYPE_UD);
1052 assert(src0.type != BRW_REGISTER_TYPE_D);
1053 }
1054
1055 return brw_alu2(p, BRW_OPCODE_ADD, dest, src0, src1);
1056 }
1057
1058 brw_inst *
1059 brw_AVG(struct brw_compile *p, struct brw_reg dest,
1060 struct brw_reg src0, struct brw_reg src1)
1061 {
1062 assert(dest.type == src0.type);
1063 assert(src0.type == src1.type);
1064 switch (src0.type) {
1065 case BRW_REGISTER_TYPE_B:
1066 case BRW_REGISTER_TYPE_UB:
1067 case BRW_REGISTER_TYPE_W:
1068 case BRW_REGISTER_TYPE_UW:
1069 case BRW_REGISTER_TYPE_D:
1070 case BRW_REGISTER_TYPE_UD:
1071 break;
1072 default:
1073 unreachable("Bad type for brw_AVG");
1074 }
1075
1076 return brw_alu2(p, BRW_OPCODE_AVG, dest, src0, src1);
1077 }
1078
1079 brw_inst *
1080 brw_MUL(struct brw_compile *p, struct brw_reg dest,
1081 struct brw_reg src0, struct brw_reg src1)
1082 {
1083 /* 6.32.38: mul */
1084 if (src0.type == BRW_REGISTER_TYPE_D ||
1085 src0.type == BRW_REGISTER_TYPE_UD ||
1086 src1.type == BRW_REGISTER_TYPE_D ||
1087 src1.type == BRW_REGISTER_TYPE_UD) {
1088 assert(dest.type != BRW_REGISTER_TYPE_F);
1089 }
1090
1091 if (src0.type == BRW_REGISTER_TYPE_F ||
1092 (src0.file == BRW_IMMEDIATE_VALUE &&
1093 src0.type == BRW_REGISTER_TYPE_VF)) {
1094 assert(src1.type != BRW_REGISTER_TYPE_UD);
1095 assert(src1.type != BRW_REGISTER_TYPE_D);
1096 }
1097
1098 if (src1.type == BRW_REGISTER_TYPE_F ||
1099 (src1.file == BRW_IMMEDIATE_VALUE &&
1100 src1.type == BRW_REGISTER_TYPE_VF)) {
1101 assert(src0.type != BRW_REGISTER_TYPE_UD);
1102 assert(src0.type != BRW_REGISTER_TYPE_D);
1103 }
1104
1105 assert(src0.file != BRW_ARCHITECTURE_REGISTER_FILE ||
1106 src0.nr != BRW_ARF_ACCUMULATOR);
1107 assert(src1.file != BRW_ARCHITECTURE_REGISTER_FILE ||
1108 src1.nr != BRW_ARF_ACCUMULATOR);
1109
1110 return brw_alu2(p, BRW_OPCODE_MUL, dest, src0, src1);
1111 }
1112
1113
1114 void brw_NOP(struct brw_compile *p)
1115 {
1116 brw_inst *insn = next_insn(p, BRW_OPCODE_NOP);
1117 brw_set_dest(p, insn, retype(brw_vec4_grf(0,0), BRW_REGISTER_TYPE_UD));
1118 brw_set_src0(p, insn, retype(brw_vec4_grf(0,0), BRW_REGISTER_TYPE_UD));
1119 brw_set_src1(p, insn, brw_imm_ud(0x0));
1120 }
1121
1122
1123
1124
1125
1126 /***********************************************************************
1127 * Comparisons, if/else/endif
1128 */
1129
1130 brw_inst *
1131 brw_JMPI(struct brw_compile *p, struct brw_reg index,
1132 unsigned predicate_control)
1133 {
1134 const struct brw_context *brw = p->brw;
1135 struct brw_reg ip = brw_ip_reg();
1136 brw_inst *inst = brw_alu2(p, BRW_OPCODE_JMPI, ip, ip, index);
1137
1138 brw_inst_set_exec_size(brw, inst, BRW_EXECUTE_2);
1139 brw_inst_set_qtr_control(brw, inst, BRW_COMPRESSION_NONE);
1140 brw_inst_set_mask_control(brw, inst, BRW_MASK_DISABLE);
1141 brw_inst_set_pred_control(brw, inst, predicate_control);
1142
1143 return inst;
1144 }
1145
1146 static void
1147 push_if_stack(struct brw_compile *p, brw_inst *inst)
1148 {
1149 p->if_stack[p->if_stack_depth] = inst - p->store;
1150
1151 p->if_stack_depth++;
1152 if (p->if_stack_array_size <= p->if_stack_depth) {
1153 p->if_stack_array_size *= 2;
1154 p->if_stack = reralloc(p->mem_ctx, p->if_stack, int,
1155 p->if_stack_array_size);
1156 }
1157 }
1158
1159 static brw_inst *
1160 pop_if_stack(struct brw_compile *p)
1161 {
1162 p->if_stack_depth--;
1163 return &p->store[p->if_stack[p->if_stack_depth]];
1164 }
1165
1166 static void
1167 push_loop_stack(struct brw_compile *p, brw_inst *inst)
1168 {
1169 if (p->loop_stack_array_size < p->loop_stack_depth) {
1170 p->loop_stack_array_size *= 2;
1171 p->loop_stack = reralloc(p->mem_ctx, p->loop_stack, int,
1172 p->loop_stack_array_size);
1173 p->if_depth_in_loop = reralloc(p->mem_ctx, p->if_depth_in_loop, int,
1174 p->loop_stack_array_size);
1175 }
1176
1177 p->loop_stack[p->loop_stack_depth] = inst - p->store;
1178 p->loop_stack_depth++;
1179 p->if_depth_in_loop[p->loop_stack_depth] = 0;
1180 }
1181
1182 static brw_inst *
1183 get_inner_do_insn(struct brw_compile *p)
1184 {
1185 return &p->store[p->loop_stack[p->loop_stack_depth - 1]];
1186 }
1187
1188 /* EU takes the value from the flag register and pushes it onto some
1189 * sort of a stack (presumably merging with any flag value already on
1190 * the stack). Within an if block, the flags at the top of the stack
1191 * control execution on each channel of the unit, eg. on each of the
1192 * 16 pixel values in our wm programs.
1193 *
1194 * When the matching 'else' instruction is reached (presumably by
1195 * countdown of the instruction count patched in by our ELSE/ENDIF
1196 * functions), the relevent flags are inverted.
1197 *
1198 * When the matching 'endif' instruction is reached, the flags are
1199 * popped off. If the stack is now empty, normal execution resumes.
1200 */
1201 brw_inst *
1202 brw_IF(struct brw_compile *p, unsigned execute_size)
1203 {
1204 struct brw_context *brw = p->brw;
1205 brw_inst *insn;
1206
1207 insn = next_insn(p, BRW_OPCODE_IF);
1208
1209 /* Override the defaults for this instruction:
1210 */
1211 if (brw->gen < 6) {
1212 brw_set_dest(p, insn, brw_ip_reg());
1213 brw_set_src0(p, insn, brw_ip_reg());
1214 brw_set_src1(p, insn, brw_imm_d(0x0));
1215 } else if (brw->gen == 6) {
1216 brw_set_dest(p, insn, brw_imm_w(0));
1217 brw_inst_set_gen6_jump_count(brw, insn, 0);
1218 brw_set_src0(p, insn, vec1(retype(brw_null_reg(), BRW_REGISTER_TYPE_D)));
1219 brw_set_src1(p, insn, vec1(retype(brw_null_reg(), BRW_REGISTER_TYPE_D)));
1220 } else {
1221 brw_set_dest(p, insn, vec1(retype(brw_null_reg(), BRW_REGISTER_TYPE_D)));
1222 brw_set_src0(p, insn, vec1(retype(brw_null_reg(), BRW_REGISTER_TYPE_D)));
1223 brw_set_src1(p, insn, brw_imm_ud(0));
1224 brw_inst_set_jip(brw, insn, 0);
1225 brw_inst_set_uip(brw, insn, 0);
1226 }
1227
1228 brw_inst_set_exec_size(brw, insn, execute_size);
1229 brw_inst_set_qtr_control(brw, insn, BRW_COMPRESSION_NONE);
1230 brw_inst_set_pred_control(brw, insn, BRW_PREDICATE_NORMAL);
1231 brw_inst_set_mask_control(brw, insn, BRW_MASK_ENABLE);
1232 if (!p->single_program_flow && brw->gen < 6)
1233 brw_inst_set_thread_control(brw, insn, BRW_THREAD_SWITCH);
1234
1235 push_if_stack(p, insn);
1236 p->if_depth_in_loop[p->loop_stack_depth]++;
1237 return insn;
1238 }
1239
1240 /* This function is only used for gen6-style IF instructions with an
1241 * embedded comparison (conditional modifier). It is not used on gen7.
1242 */
1243 brw_inst *
1244 gen6_IF(struct brw_compile *p, enum brw_conditional_mod conditional,
1245 struct brw_reg src0, struct brw_reg src1)
1246 {
1247 const struct brw_context *brw = p->brw;
1248 brw_inst *insn;
1249
1250 insn = next_insn(p, BRW_OPCODE_IF);
1251
1252 brw_set_dest(p, insn, brw_imm_w(0));
1253 brw_inst_set_exec_size(brw, insn, p->compressed ? BRW_EXECUTE_16
1254 : BRW_EXECUTE_8);
1255 brw_inst_set_gen6_jump_count(brw, insn, 0);
1256 brw_set_src0(p, insn, src0);
1257 brw_set_src1(p, insn, src1);
1258
1259 assert(brw_inst_qtr_control(brw, insn) == BRW_COMPRESSION_NONE);
1260 assert(brw_inst_pred_control(brw, insn) == BRW_PREDICATE_NONE);
1261 brw_inst_set_cond_modifier(brw, insn, conditional);
1262
1263 push_if_stack(p, insn);
1264 return insn;
1265 }
1266
1267 /**
1268 * In single-program-flow (SPF) mode, convert IF and ELSE into ADDs.
1269 */
1270 static void
1271 convert_IF_ELSE_to_ADD(struct brw_compile *p,
1272 brw_inst *if_inst, brw_inst *else_inst)
1273 {
1274 const struct brw_context *brw = p->brw;
1275
1276 /* The next instruction (where the ENDIF would be, if it existed) */
1277 brw_inst *next_inst = &p->store[p->nr_insn];
1278
1279 assert(p->single_program_flow);
1280 assert(if_inst != NULL && brw_inst_opcode(brw, if_inst) == BRW_OPCODE_IF);
1281 assert(else_inst == NULL || brw_inst_opcode(brw, else_inst) == BRW_OPCODE_ELSE);
1282 assert(brw_inst_exec_size(brw, if_inst) == BRW_EXECUTE_1);
1283
1284 /* Convert IF to an ADD instruction that moves the instruction pointer
1285 * to the first instruction of the ELSE block. If there is no ELSE
1286 * block, point to where ENDIF would be. Reverse the predicate.
1287 *
1288 * There's no need to execute an ENDIF since we don't need to do any
1289 * stack operations, and if we're currently executing, we just want to
1290 * continue normally.
1291 */
1292 brw_inst_set_opcode(brw, if_inst, BRW_OPCODE_ADD);
1293 brw_inst_set_pred_inv(brw, if_inst, true);
1294
1295 if (else_inst != NULL) {
1296 /* Convert ELSE to an ADD instruction that points where the ENDIF
1297 * would be.
1298 */
1299 brw_inst_set_opcode(brw, else_inst, BRW_OPCODE_ADD);
1300
1301 brw_inst_set_imm_ud(brw, if_inst, (else_inst - if_inst + 1) * 16);
1302 brw_inst_set_imm_ud(brw, else_inst, (next_inst - else_inst) * 16);
1303 } else {
1304 brw_inst_set_imm_ud(brw, if_inst, (next_inst - if_inst) * 16);
1305 }
1306 }
1307
1308 /**
1309 * Patch IF and ELSE instructions with appropriate jump targets.
1310 */
1311 static void
1312 patch_IF_ELSE(struct brw_compile *p,
1313 brw_inst *if_inst, brw_inst *else_inst, brw_inst *endif_inst)
1314 {
1315 struct brw_context *brw = p->brw;
1316
1317 /* We shouldn't be patching IF and ELSE instructions in single program flow
1318 * mode when gen < 6, because in single program flow mode on those
1319 * platforms, we convert flow control instructions to conditional ADDs that
1320 * operate on IP (see brw_ENDIF).
1321 *
1322 * However, on Gen6, writing to IP doesn't work in single program flow mode
1323 * (see the SandyBridge PRM, Volume 4 part 2, p79: "When SPF is ON, IP may
1324 * not be updated by non-flow control instructions."). And on later
1325 * platforms, there is no significant benefit to converting control flow
1326 * instructions to conditional ADDs. So we do patch IF and ELSE
1327 * instructions in single program flow mode on those platforms.
1328 */
1329 if (brw->gen < 6)
1330 assert(!p->single_program_flow);
1331
1332 assert(if_inst != NULL && brw_inst_opcode(brw, if_inst) == BRW_OPCODE_IF);
1333 assert(endif_inst != NULL);
1334 assert(else_inst == NULL || brw_inst_opcode(brw, else_inst) == BRW_OPCODE_ELSE);
1335
1336 unsigned br = 1;
1337 /* Jump count is for 64bit data chunk each, so one 128bit instruction
1338 * requires 2 chunks.
1339 */
1340 if (brw->gen >= 5)
1341 br = 2;
1342
1343 assert(brw_inst_opcode(brw, endif_inst) == BRW_OPCODE_ENDIF);
1344 brw_inst_set_exec_size(brw, endif_inst, brw_inst_exec_size(brw, if_inst));
1345
1346 if (else_inst == NULL) {
1347 /* Patch IF -> ENDIF */
1348 if (brw->gen < 6) {
1349 /* Turn it into an IFF, which means no mask stack operations for
1350 * all-false and jumping past the ENDIF.
1351 */
1352 brw_inst_set_opcode(brw, if_inst, BRW_OPCODE_IFF);
1353 brw_inst_set_gen4_jump_count(brw, if_inst,
1354 br * (endif_inst - if_inst + 1));
1355 brw_inst_set_gen4_pop_count(brw, if_inst, 0);
1356 } else if (brw->gen == 6) {
1357 /* As of gen6, there is no IFF and IF must point to the ENDIF. */
1358 brw_inst_set_gen6_jump_count(brw, if_inst, br*(endif_inst - if_inst));
1359 } else {
1360 brw_inst_set_uip(brw, if_inst, br * (endif_inst - if_inst));
1361 brw_inst_set_jip(brw, if_inst, br * (endif_inst - if_inst));
1362 }
1363 } else {
1364 brw_inst_set_exec_size(brw, else_inst, brw_inst_exec_size(brw, if_inst));
1365
1366 /* Patch IF -> ELSE */
1367 if (brw->gen < 6) {
1368 brw_inst_set_gen4_jump_count(brw, if_inst,
1369 br * (else_inst - if_inst));
1370 brw_inst_set_gen4_pop_count(brw, if_inst, 0);
1371 } else if (brw->gen == 6) {
1372 brw_inst_set_gen6_jump_count(brw, if_inst,
1373 br * (else_inst - if_inst + 1));
1374 }
1375
1376 /* Patch ELSE -> ENDIF */
1377 if (brw->gen < 6) {
1378 /* BRW_OPCODE_ELSE pre-gen6 should point just past the
1379 * matching ENDIF.
1380 */
1381 brw_inst_set_gen4_jump_count(brw, else_inst,
1382 br * (endif_inst - else_inst + 1));
1383 brw_inst_set_gen4_pop_count(brw, else_inst, 1);
1384 } else if (brw->gen == 6) {
1385 /* BRW_OPCODE_ELSE on gen6 should point to the matching ENDIF. */
1386 brw_inst_set_gen6_jump_count(brw, else_inst,
1387 br * (endif_inst - else_inst));
1388 } else {
1389 /* The IF instruction's JIP should point just past the ELSE */
1390 brw_inst_set_jip(brw, if_inst, br * (else_inst - if_inst + 1));
1391 /* The IF instruction's UIP and ELSE's JIP should point to ENDIF */
1392 brw_inst_set_uip(brw, if_inst, br * (endif_inst - if_inst));
1393 brw_inst_set_jip(brw, else_inst, br * (endif_inst - else_inst));
1394 }
1395 }
1396 }
1397
1398 void
1399 brw_ELSE(struct brw_compile *p)
1400 {
1401 struct brw_context *brw = p->brw;
1402 brw_inst *insn;
1403
1404 insn = next_insn(p, BRW_OPCODE_ELSE);
1405
1406 if (brw->gen < 6) {
1407 brw_set_dest(p, insn, brw_ip_reg());
1408 brw_set_src0(p, insn, brw_ip_reg());
1409 brw_set_src1(p, insn, brw_imm_d(0x0));
1410 } else if (brw->gen == 6) {
1411 brw_set_dest(p, insn, brw_imm_w(0));
1412 brw_inst_set_gen6_jump_count(brw, insn, 0);
1413 brw_set_src0(p, insn, retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
1414 brw_set_src1(p, insn, retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
1415 } else {
1416 brw_set_dest(p, insn, retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
1417 brw_set_src0(p, insn, retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
1418 brw_set_src1(p, insn, brw_imm_ud(0));
1419 brw_inst_set_jip(brw, insn, 0);
1420 brw_inst_set_uip(brw, insn, 0);
1421 }
1422
1423 brw_inst_set_qtr_control(brw, insn, BRW_COMPRESSION_NONE);
1424 brw_inst_set_mask_control(brw, insn, BRW_MASK_ENABLE);
1425 if (!p->single_program_flow && brw->gen < 6)
1426 brw_inst_set_thread_control(brw, insn, BRW_THREAD_SWITCH);
1427
1428 push_if_stack(p, insn);
1429 }
1430
1431 void
1432 brw_ENDIF(struct brw_compile *p)
1433 {
1434 struct brw_context *brw = p->brw;
1435 brw_inst *insn = NULL;
1436 brw_inst *else_inst = NULL;
1437 brw_inst *if_inst = NULL;
1438 brw_inst *tmp;
1439 bool emit_endif = true;
1440
1441 /* In single program flow mode, we can express IF and ELSE instructions
1442 * equivalently as ADD instructions that operate on IP. On platforms prior
1443 * to Gen6, flow control instructions cause an implied thread switch, so
1444 * this is a significant savings.
1445 *
1446 * However, on Gen6, writing to IP doesn't work in single program flow mode
1447 * (see the SandyBridge PRM, Volume 4 part 2, p79: "When SPF is ON, IP may
1448 * not be updated by non-flow control instructions."). And on later
1449 * platforms, there is no significant benefit to converting control flow
1450 * instructions to conditional ADDs. So we only do this trick on Gen4 and
1451 * Gen5.
1452 */
1453 if (brw->gen < 6 && p->single_program_flow)
1454 emit_endif = false;
1455
1456 /*
1457 * A single next_insn() may change the base adress of instruction store
1458 * memory(p->store), so call it first before referencing the instruction
1459 * store pointer from an index
1460 */
1461 if (emit_endif)
1462 insn = next_insn(p, BRW_OPCODE_ENDIF);
1463
1464 /* Pop the IF and (optional) ELSE instructions from the stack */
1465 p->if_depth_in_loop[p->loop_stack_depth]--;
1466 tmp = pop_if_stack(p);
1467 if (brw_inst_opcode(brw, tmp) == BRW_OPCODE_ELSE) {
1468 else_inst = tmp;
1469 tmp = pop_if_stack(p);
1470 }
1471 if_inst = tmp;
1472
1473 if (!emit_endif) {
1474 /* ENDIF is useless; don't bother emitting it. */
1475 convert_IF_ELSE_to_ADD(p, if_inst, else_inst);
1476 return;
1477 }
1478
1479 if (brw->gen < 6) {
1480 brw_set_dest(p, insn, retype(brw_vec4_grf(0,0), BRW_REGISTER_TYPE_UD));
1481 brw_set_src0(p, insn, retype(brw_vec4_grf(0,0), BRW_REGISTER_TYPE_UD));
1482 brw_set_src1(p, insn, brw_imm_d(0x0));
1483 } else if (brw->gen == 6) {
1484 brw_set_dest(p, insn, brw_imm_w(0));
1485 brw_set_src0(p, insn, retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
1486 brw_set_src1(p, insn, retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
1487 } else {
1488 brw_set_dest(p, insn, retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
1489 brw_set_src0(p, insn, retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
1490 brw_set_src1(p, insn, brw_imm_ud(0));
1491 }
1492
1493 brw_inst_set_qtr_control(brw, insn, BRW_COMPRESSION_NONE);
1494 brw_inst_set_mask_control(brw, insn, BRW_MASK_ENABLE);
1495 if (brw->gen < 6)
1496 brw_inst_set_thread_control(brw, insn, BRW_THREAD_SWITCH);
1497
1498 /* Also pop item off the stack in the endif instruction: */
1499 if (brw->gen < 6) {
1500 brw_inst_set_gen4_jump_count(brw, insn, 0);
1501 brw_inst_set_gen4_pop_count(brw, insn, 1);
1502 } else if (brw->gen == 6) {
1503 brw_inst_set_gen6_jump_count(brw, insn, 2);
1504 } else {
1505 brw_inst_set_jip(brw, insn, 2);
1506 }
1507 patch_IF_ELSE(p, if_inst, else_inst, insn);
1508 }
1509
1510 brw_inst *
1511 brw_BREAK(struct brw_compile *p)
1512 {
1513 struct brw_context *brw = p->brw;
1514 brw_inst *insn;
1515
1516 insn = next_insn(p, BRW_OPCODE_BREAK);
1517 if (brw->gen >= 6) {
1518 brw_set_dest(p, insn, retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
1519 brw_set_src0(p, insn, retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
1520 brw_set_src1(p, insn, brw_imm_d(0x0));
1521 } else {
1522 brw_set_dest(p, insn, brw_ip_reg());
1523 brw_set_src0(p, insn, brw_ip_reg());
1524 brw_set_src1(p, insn, brw_imm_d(0x0));
1525 brw_inst_set_gen4_pop_count(brw, insn,
1526 p->if_depth_in_loop[p->loop_stack_depth]);
1527 }
1528 brw_inst_set_qtr_control(brw, insn, BRW_COMPRESSION_NONE);
1529 brw_inst_set_exec_size(brw, insn, p->compressed ? BRW_EXECUTE_16
1530 : BRW_EXECUTE_8);
1531
1532 return insn;
1533 }
1534
1535 brw_inst *
1536 brw_CONT(struct brw_compile *p)
1537 {
1538 const struct brw_context *brw = p->brw;
1539 brw_inst *insn;
1540
1541 insn = next_insn(p, BRW_OPCODE_CONTINUE);
1542 brw_set_dest(p, insn, brw_ip_reg());
1543 brw_set_src0(p, insn, brw_ip_reg());
1544 brw_set_src1(p, insn, brw_imm_d(0x0));
1545
1546 if (brw->gen < 6) {
1547 brw_inst_set_gen4_pop_count(brw, insn,
1548 p->if_depth_in_loop[p->loop_stack_depth]);
1549 }
1550 brw_inst_set_qtr_control(brw, insn, BRW_COMPRESSION_NONE);
1551 brw_inst_set_exec_size(brw, insn, p->compressed ? BRW_EXECUTE_16
1552 : BRW_EXECUTE_8);
1553 return insn;
1554 }
1555
1556 brw_inst *
1557 gen6_HALT(struct brw_compile *p)
1558 {
1559 const struct brw_context *brw = p->brw;
1560 brw_inst *insn;
1561
1562 insn = next_insn(p, BRW_OPCODE_HALT);
1563 brw_set_dest(p, insn, retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
1564 brw_set_src0(p, insn, retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
1565 brw_set_src1(p, insn, brw_imm_d(0x0)); /* UIP and JIP, updated later. */
1566
1567 if (p->compressed) {
1568 brw_inst_set_exec_size(brw, insn, BRW_EXECUTE_16);
1569 } else {
1570 brw_inst_set_qtr_control(brw, insn, BRW_COMPRESSION_NONE);
1571 brw_inst_set_exec_size(brw, insn, BRW_EXECUTE_8);
1572 }
1573 return insn;
1574 }
1575
1576 /* DO/WHILE loop:
1577 *
1578 * The DO/WHILE is just an unterminated loop -- break or continue are
1579 * used for control within the loop. We have a few ways they can be
1580 * done.
1581 *
1582 * For uniform control flow, the WHILE is just a jump, so ADD ip, ip,
1583 * jip and no DO instruction.
1584 *
1585 * For non-uniform control flow pre-gen6, there's a DO instruction to
1586 * push the mask, and a WHILE to jump back, and BREAK to get out and
1587 * pop the mask.
1588 *
1589 * For gen6, there's no more mask stack, so no need for DO. WHILE
1590 * just points back to the first instruction of the loop.
1591 */
1592 brw_inst *
1593 brw_DO(struct brw_compile *p, unsigned execute_size)
1594 {
1595 struct brw_context *brw = p->brw;
1596
1597 if (brw->gen >= 6 || p->single_program_flow) {
1598 push_loop_stack(p, &p->store[p->nr_insn]);
1599 return &p->store[p->nr_insn];
1600 } else {
1601 brw_inst *insn = next_insn(p, BRW_OPCODE_DO);
1602
1603 push_loop_stack(p, insn);
1604
1605 /* Override the defaults for this instruction:
1606 */
1607 brw_set_dest(p, insn, brw_null_reg());
1608 brw_set_src0(p, insn, brw_null_reg());
1609 brw_set_src1(p, insn, brw_null_reg());
1610
1611 brw_inst_set_qtr_control(brw, insn, BRW_COMPRESSION_NONE);
1612 brw_inst_set_exec_size(brw, insn, execute_size);
1613 brw_inst_set_pred_control(brw, insn, BRW_PREDICATE_NONE);
1614
1615 return insn;
1616 }
1617 }
1618
1619 /**
1620 * For pre-gen6, we patch BREAK/CONT instructions to point at the WHILE
1621 * instruction here.
1622 *
1623 * For gen6+, see brw_set_uip_jip(), which doesn't care so much about the loop
1624 * nesting, since it can always just point to the end of the block/current loop.
1625 */
1626 static void
1627 brw_patch_break_cont(struct brw_compile *p, brw_inst *while_inst)
1628 {
1629 struct brw_context *brw = p->brw;
1630 brw_inst *do_inst = get_inner_do_insn(p);
1631 brw_inst *inst;
1632 int br = (brw->gen == 5) ? 2 : 1;
1633
1634 for (inst = while_inst - 1; inst != do_inst; inst--) {
1635 /* If the jump count is != 0, that means that this instruction has already
1636 * been patched because it's part of a loop inside of the one we're
1637 * patching.
1638 */
1639 if (brw_inst_opcode(brw, inst) == BRW_OPCODE_BREAK &&
1640 brw_inst_gen4_jump_count(brw, inst) == 0) {
1641 brw_inst_set_gen4_jump_count(brw, inst, br*((while_inst - inst) + 1));
1642 } else if (brw_inst_opcode(brw, inst) == BRW_OPCODE_CONTINUE &&
1643 brw_inst_gen4_jump_count(brw, inst) == 0) {
1644 brw_inst_set_gen4_jump_count(brw, inst, br * (while_inst - inst));
1645 }
1646 }
1647 }
1648
1649 brw_inst *
1650 brw_WHILE(struct brw_compile *p)
1651 {
1652 struct brw_context *brw = p->brw;
1653 brw_inst *insn, *do_insn;
1654 unsigned br = 1;
1655
1656 if (brw->gen >= 5)
1657 br = 2;
1658
1659 if (brw->gen >= 7) {
1660 insn = next_insn(p, BRW_OPCODE_WHILE);
1661 do_insn = get_inner_do_insn(p);
1662
1663 brw_set_dest(p, insn, retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
1664 brw_set_src0(p, insn, retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
1665 brw_set_src1(p, insn, brw_imm_ud(0));
1666 brw_inst_set_jip(brw, insn, br * (do_insn - insn));
1667
1668 brw_inst_set_exec_size(brw, insn, p->compressed ? BRW_EXECUTE_16
1669 : BRW_EXECUTE_8);
1670 } else if (brw->gen == 6) {
1671 insn = next_insn(p, BRW_OPCODE_WHILE);
1672 do_insn = get_inner_do_insn(p);
1673
1674 brw_set_dest(p, insn, brw_imm_w(0));
1675 brw_inst_set_gen6_jump_count(brw, insn, br * (do_insn - insn));
1676 brw_set_src0(p, insn, retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
1677 brw_set_src1(p, insn, retype(brw_null_reg(), BRW_REGISTER_TYPE_D));
1678
1679 brw_inst_set_exec_size(brw, insn, p->compressed ? BRW_EXECUTE_16
1680 : BRW_EXECUTE_8);
1681 } else {
1682 if (p->single_program_flow) {
1683 insn = next_insn(p, BRW_OPCODE_ADD);
1684 do_insn = get_inner_do_insn(p);
1685
1686 brw_set_dest(p, insn, brw_ip_reg());
1687 brw_set_src0(p, insn, brw_ip_reg());
1688 brw_set_src1(p, insn, brw_imm_d((do_insn - insn) * 16));
1689 brw_inst_set_exec_size(brw, insn, BRW_EXECUTE_1);
1690 } else {
1691 insn = next_insn(p, BRW_OPCODE_WHILE);
1692 do_insn = get_inner_do_insn(p);
1693
1694 assert(brw_inst_opcode(brw, do_insn) == BRW_OPCODE_DO);
1695
1696 brw_set_dest(p, insn, brw_ip_reg());
1697 brw_set_src0(p, insn, brw_ip_reg());
1698 brw_set_src1(p, insn, brw_imm_d(0));
1699
1700 brw_inst_set_exec_size(brw, insn, brw_inst_exec_size(brw, do_insn));
1701 brw_inst_set_gen4_jump_count(brw, insn, br * (do_insn - insn + 1));
1702 brw_inst_set_gen4_pop_count(brw, insn, 0);
1703
1704 brw_patch_break_cont(p, insn);
1705 }
1706 }
1707 brw_inst_set_qtr_control(brw, insn, BRW_COMPRESSION_NONE);
1708
1709 p->loop_stack_depth--;
1710
1711 return insn;
1712 }
1713
1714 /* FORWARD JUMPS:
1715 */
1716 void brw_land_fwd_jump(struct brw_compile *p, int jmp_insn_idx)
1717 {
1718 struct brw_context *brw = p->brw;
1719 brw_inst *jmp_insn = &p->store[jmp_insn_idx];
1720 unsigned jmpi = 1;
1721
1722 if (brw->gen >= 5)
1723 jmpi = 2;
1724
1725 assert(brw_inst_opcode(brw, jmp_insn) == BRW_OPCODE_JMPI);
1726 assert(brw_inst_src1_reg_file(brw, jmp_insn) == BRW_IMMEDIATE_VALUE);
1727
1728 brw_inst_set_gen4_jump_count(brw, jmp_insn,
1729 jmpi * (p->nr_insn - jmp_insn_idx - 1));
1730 }
1731
1732 /* To integrate with the above, it makes sense that the comparison
1733 * instruction should populate the flag register. It might be simpler
1734 * just to use the flag reg for most WM tasks?
1735 */
1736 void brw_CMP(struct brw_compile *p,
1737 struct brw_reg dest,
1738 unsigned conditional,
1739 struct brw_reg src0,
1740 struct brw_reg src1)
1741 {
1742 struct brw_context *brw = p->brw;
1743 brw_inst *insn = next_insn(p, BRW_OPCODE_CMP);
1744
1745 if (brw->gen >= 8) {
1746 /* The CMP instruction appears to behave erratically for floating point
1747 * sources unless the destination type is also float. Overriding it to
1748 * match src0 makes it work in all cases.
1749 */
1750 dest.type = src0.type;
1751 }
1752
1753 brw_inst_set_cond_modifier(brw, insn, conditional);
1754 brw_set_dest(p, insn, dest);
1755 brw_set_src0(p, insn, src0);
1756 brw_set_src1(p, insn, src1);
1757
1758 /* Item WaCMPInstNullDstForcesThreadSwitch in the Haswell Bspec workarounds
1759 * page says:
1760 * "Any CMP instruction with a null destination must use a {switch}."
1761 *
1762 * It also applies to other Gen7 platforms (IVB, BYT) even though it isn't
1763 * mentioned on their work-arounds pages.
1764 */
1765 if (brw->gen == 7) {
1766 if (dest.file == BRW_ARCHITECTURE_REGISTER_FILE &&
1767 dest.nr == BRW_ARF_NULL) {
1768 brw_inst_set_thread_control(brw, insn, BRW_THREAD_SWITCH);
1769 }
1770 }
1771 }
1772
1773 /***********************************************************************
1774 * Helpers for the various SEND message types:
1775 */
1776
1777 /** Extended math function, float[8].
1778 */
1779 void gen4_math(struct brw_compile *p,
1780 struct brw_reg dest,
1781 unsigned function,
1782 unsigned msg_reg_nr,
1783 struct brw_reg src,
1784 unsigned data_type,
1785 unsigned precision )
1786 {
1787 struct brw_context *brw = p->brw;
1788 brw_inst *insn = next_insn(p, BRW_OPCODE_SEND);
1789
1790 assert(brw->gen < 6);
1791
1792 /* Example code doesn't set predicate_control for send
1793 * instructions.
1794 */
1795 brw_inst_set_pred_control(brw, insn, 0);
1796 brw_inst_set_base_mrf(brw, insn, msg_reg_nr);
1797
1798 brw_set_dest(p, insn, dest);
1799 brw_set_src0(p, insn, src);
1800 brw_set_math_message(p,
1801 insn,
1802 function,
1803 src.type == BRW_REGISTER_TYPE_D,
1804 precision,
1805 data_type);
1806 }
1807
1808 void gen6_math(struct brw_compile *p,
1809 struct brw_reg dest,
1810 unsigned function,
1811 struct brw_reg src0,
1812 struct brw_reg src1)
1813 {
1814 struct brw_context *brw = p->brw;
1815 brw_inst *insn = next_insn(p, BRW_OPCODE_MATH);
1816
1817 assert(brw->gen >= 6);
1818
1819 assert(dest.file == BRW_GENERAL_REGISTER_FILE ||
1820 (brw->gen >= 7 && dest.file == BRW_MESSAGE_REGISTER_FILE));
1821 assert(src0.file == BRW_GENERAL_REGISTER_FILE);
1822
1823 assert(dest.hstride == BRW_HORIZONTAL_STRIDE_1);
1824 if (brw->gen == 6) {
1825 assert(src0.hstride == BRW_HORIZONTAL_STRIDE_1);
1826 assert(src1.hstride == BRW_HORIZONTAL_STRIDE_1);
1827 }
1828
1829 if (function == BRW_MATH_FUNCTION_INT_DIV_QUOTIENT ||
1830 function == BRW_MATH_FUNCTION_INT_DIV_REMAINDER ||
1831 function == BRW_MATH_FUNCTION_INT_DIV_QUOTIENT_AND_REMAINDER) {
1832 assert(src0.type != BRW_REGISTER_TYPE_F);
1833 assert(src1.type != BRW_REGISTER_TYPE_F);
1834 assert(src1.file == BRW_GENERAL_REGISTER_FILE);
1835 } else {
1836 assert(src0.type == BRW_REGISTER_TYPE_F);
1837 assert(src1.type == BRW_REGISTER_TYPE_F);
1838 if (function == BRW_MATH_FUNCTION_POW) {
1839 assert(src1.file == BRW_GENERAL_REGISTER_FILE);
1840 } else {
1841 assert(src1.file == BRW_ARCHITECTURE_REGISTER_FILE &&
1842 src1.nr == BRW_ARF_NULL);
1843 }
1844 }
1845
1846 /* Source modifiers are ignored for extended math instructions on Gen6. */
1847 if (brw->gen == 6) {
1848 assert(!src0.negate);
1849 assert(!src0.abs);
1850 assert(!src1.negate);
1851 assert(!src1.abs);
1852 }
1853
1854 brw_inst_set_math_function(brw, insn, function);
1855
1856 brw_set_dest(p, insn, dest);
1857 brw_set_src0(p, insn, src0);
1858 brw_set_src1(p, insn, src1);
1859 }
1860
1861
1862 /**
1863 * Write a block of OWORDs (half a GRF each) from the scratch buffer,
1864 * using a constant offset per channel.
1865 *
1866 * The offset must be aligned to oword size (16 bytes). Used for
1867 * register spilling.
1868 */
1869 void brw_oword_block_write_scratch(struct brw_compile *p,
1870 struct brw_reg mrf,
1871 int num_regs,
1872 unsigned offset)
1873 {
1874 struct brw_context *brw = p->brw;
1875 uint32_t msg_control, msg_type;
1876 int mlen;
1877
1878 if (brw->gen >= 6)
1879 offset /= 16;
1880
1881 mrf = retype(mrf, BRW_REGISTER_TYPE_UD);
1882
1883 if (num_regs == 1) {
1884 msg_control = BRW_DATAPORT_OWORD_BLOCK_2_OWORDS;
1885 mlen = 2;
1886 } else {
1887 msg_control = BRW_DATAPORT_OWORD_BLOCK_4_OWORDS;
1888 mlen = 3;
1889 }
1890
1891 /* Set up the message header. This is g0, with g0.2 filled with
1892 * the offset. We don't want to leave our offset around in g0 or
1893 * it'll screw up texture samples, so set it up inside the message
1894 * reg.
1895 */
1896 {
1897 brw_push_insn_state(p);
1898 brw_set_default_mask_control(p, BRW_MASK_DISABLE);
1899 brw_set_default_compression_control(p, BRW_COMPRESSION_NONE);
1900
1901 brw_MOV(p, mrf, retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UD));
1902
1903 /* set message header global offset field (reg 0, element 2) */
1904 brw_MOV(p,
1905 retype(brw_vec1_reg(BRW_MESSAGE_REGISTER_FILE,
1906 mrf.nr,
1907 2), BRW_REGISTER_TYPE_UD),
1908 brw_imm_ud(offset));
1909
1910 brw_pop_insn_state(p);
1911 }
1912
1913 {
1914 struct brw_reg dest;
1915 brw_inst *insn = next_insn(p, BRW_OPCODE_SEND);
1916 int send_commit_msg;
1917 struct brw_reg src_header = retype(brw_vec8_grf(0, 0),
1918 BRW_REGISTER_TYPE_UW);
1919
1920 if (brw_inst_qtr_control(brw, insn) != BRW_COMPRESSION_NONE) {
1921 brw_inst_set_qtr_control(brw, insn, BRW_COMPRESSION_NONE);
1922 src_header = vec16(src_header);
1923 }
1924 assert(brw_inst_pred_control(brw, insn) == BRW_PREDICATE_NONE);
1925 if (brw->gen < 6)
1926 brw_inst_set_base_mrf(brw, insn, mrf.nr);
1927
1928 /* Until gen6, writes followed by reads from the same location
1929 * are not guaranteed to be ordered unless write_commit is set.
1930 * If set, then a no-op write is issued to the destination
1931 * register to set a dependency, and a read from the destination
1932 * can be used to ensure the ordering.
1933 *
1934 * For gen6, only writes between different threads need ordering
1935 * protection. Our use of DP writes is all about register
1936 * spilling within a thread.
1937 */
1938 if (brw->gen >= 6) {
1939 dest = retype(vec16(brw_null_reg()), BRW_REGISTER_TYPE_UW);
1940 send_commit_msg = 0;
1941 } else {
1942 dest = src_header;
1943 send_commit_msg = 1;
1944 }
1945
1946 brw_set_dest(p, insn, dest);
1947 if (brw->gen >= 6) {
1948 brw_set_src0(p, insn, mrf);
1949 } else {
1950 brw_set_src0(p, insn, brw_null_reg());
1951 }
1952
1953 if (brw->gen >= 6)
1954 msg_type = GEN6_DATAPORT_WRITE_MESSAGE_OWORD_BLOCK_WRITE;
1955 else
1956 msg_type = BRW_DATAPORT_WRITE_MESSAGE_OWORD_BLOCK_WRITE;
1957
1958 brw_set_dp_write_message(p,
1959 insn,
1960 255, /* binding table index (255=stateless) */
1961 msg_control,
1962 msg_type,
1963 mlen,
1964 true, /* header_present */
1965 0, /* not a render target */
1966 send_commit_msg, /* response_length */
1967 0, /* eot */
1968 send_commit_msg);
1969 }
1970 }
1971
1972
1973 /**
1974 * Read a block of owords (half a GRF each) from the scratch buffer
1975 * using a constant index per channel.
1976 *
1977 * Offset must be aligned to oword size (16 bytes). Used for register
1978 * spilling.
1979 */
1980 void
1981 brw_oword_block_read_scratch(struct brw_compile *p,
1982 struct brw_reg dest,
1983 struct brw_reg mrf,
1984 int num_regs,
1985 unsigned offset)
1986 {
1987 struct brw_context *brw = p->brw;
1988 uint32_t msg_control;
1989 int rlen;
1990
1991 if (brw->gen >= 6)
1992 offset /= 16;
1993
1994 mrf = retype(mrf, BRW_REGISTER_TYPE_UD);
1995 dest = retype(dest, BRW_REGISTER_TYPE_UW);
1996
1997 if (num_regs == 1) {
1998 msg_control = BRW_DATAPORT_OWORD_BLOCK_2_OWORDS;
1999 rlen = 1;
2000 } else {
2001 msg_control = BRW_DATAPORT_OWORD_BLOCK_4_OWORDS;
2002 rlen = 2;
2003 }
2004
2005 {
2006 brw_push_insn_state(p);
2007 brw_set_default_compression_control(p, BRW_COMPRESSION_NONE);
2008 brw_set_default_mask_control(p, BRW_MASK_DISABLE);
2009
2010 brw_MOV(p, mrf, retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UD));
2011
2012 /* set message header global offset field (reg 0, element 2) */
2013 brw_MOV(p,
2014 retype(brw_vec1_reg(BRW_MESSAGE_REGISTER_FILE,
2015 mrf.nr,
2016 2), BRW_REGISTER_TYPE_UD),
2017 brw_imm_ud(offset));
2018
2019 brw_pop_insn_state(p);
2020 }
2021
2022 {
2023 brw_inst *insn = next_insn(p, BRW_OPCODE_SEND);
2024
2025 assert(brw_inst_pred_control(brw, insn) == 0);
2026 brw_inst_set_qtr_control(brw, insn, BRW_COMPRESSION_NONE);
2027
2028 brw_set_dest(p, insn, dest); /* UW? */
2029 if (brw->gen >= 6) {
2030 brw_set_src0(p, insn, mrf);
2031 } else {
2032 brw_set_src0(p, insn, brw_null_reg());
2033 brw_inst_set_base_mrf(brw, insn, mrf.nr);
2034 }
2035
2036 brw_set_dp_read_message(p,
2037 insn,
2038 255, /* binding table index (255=stateless) */
2039 msg_control,
2040 BRW_DATAPORT_READ_MESSAGE_OWORD_BLOCK_READ, /* msg_type */
2041 BRW_DATAPORT_READ_TARGET_RENDER_CACHE,
2042 1, /* msg_length */
2043 true, /* header_present */
2044 rlen);
2045 }
2046 }
2047
2048 void
2049 gen7_block_read_scratch(struct brw_compile *p,
2050 struct brw_reg dest,
2051 int num_regs,
2052 unsigned offset)
2053 {
2054 const struct brw_context *brw = p->brw;
2055 brw_inst *insn = next_insn(p, BRW_OPCODE_SEND);
2056 assert(brw_inst_pred_control(brw, insn) == BRW_PREDICATE_NONE);
2057
2058 brw_inst_set_qtr_control(brw, insn, BRW_COMPRESSION_NONE);
2059 brw_set_dest(p, insn, retype(dest, BRW_REGISTER_TYPE_UW));
2060
2061 /* The HW requires that the header is present; this is to get the g0.5
2062 * scratch offset.
2063 */
2064 brw_set_src0(p, insn, brw_vec8_grf(0, 0));
2065
2066 /* According to the docs, offset is "A 12-bit HWord offset into the memory
2067 * Immediate Memory buffer as specified by binding table 0xFF." An HWORD
2068 * is 32 bytes, which happens to be the size of a register.
2069 */
2070 offset /= REG_SIZE;
2071 assert(offset < (1 << 12));
2072
2073 gen7_set_dp_scratch_message(p, insn,
2074 false, /* scratch read */
2075 false, /* OWords */
2076 false, /* invalidate after read */
2077 num_regs,
2078 offset,
2079 1, /* mlen: just g0 */
2080 num_regs, /* rlen */
2081 true); /* header present */
2082 }
2083
2084 /**
2085 * Read a float[4] vector from the data port Data Cache (const buffer).
2086 * Location (in buffer) should be a multiple of 16.
2087 * Used for fetching shader constants.
2088 */
2089 void brw_oword_block_read(struct brw_compile *p,
2090 struct brw_reg dest,
2091 struct brw_reg mrf,
2092 uint32_t offset,
2093 uint32_t bind_table_index)
2094 {
2095 struct brw_context *brw = p->brw;
2096
2097 /* On newer hardware, offset is in units of owords. */
2098 if (brw->gen >= 6)
2099 offset /= 16;
2100
2101 mrf = retype(mrf, BRW_REGISTER_TYPE_UD);
2102
2103 brw_push_insn_state(p);
2104 brw_set_default_predicate_control(p, BRW_PREDICATE_NONE);
2105 brw_set_default_compression_control(p, BRW_COMPRESSION_NONE);
2106 brw_set_default_mask_control(p, BRW_MASK_DISABLE);
2107
2108 brw_MOV(p, mrf, retype(brw_vec8_grf(0, 0), BRW_REGISTER_TYPE_UD));
2109
2110 /* set message header global offset field (reg 0, element 2) */
2111 brw_MOV(p,
2112 retype(brw_vec1_reg(BRW_MESSAGE_REGISTER_FILE,
2113 mrf.nr,
2114 2), BRW_REGISTER_TYPE_UD),
2115 brw_imm_ud(offset));
2116
2117 brw_inst *insn = next_insn(p, BRW_OPCODE_SEND);
2118
2119 /* cast dest to a uword[8] vector */
2120 dest = retype(vec8(dest), BRW_REGISTER_TYPE_UW);
2121
2122 brw_set_dest(p, insn, dest);
2123 if (brw->gen >= 6) {
2124 brw_set_src0(p, insn, mrf);
2125 } else {
2126 brw_set_src0(p, insn, brw_null_reg());
2127 brw_inst_set_base_mrf(brw, insn, mrf.nr);
2128 }
2129
2130 brw_set_dp_read_message(p,
2131 insn,
2132 bind_table_index,
2133 BRW_DATAPORT_OWORD_BLOCK_1_OWORDLOW,
2134 BRW_DATAPORT_READ_MESSAGE_OWORD_BLOCK_READ,
2135 BRW_DATAPORT_READ_TARGET_DATA_CACHE,
2136 1, /* msg_length */
2137 true, /* header_present */
2138 1); /* response_length (1 reg, 2 owords!) */
2139
2140 brw_pop_insn_state(p);
2141 }
2142
2143
2144 void brw_fb_WRITE(struct brw_compile *p,
2145 int dispatch_width,
2146 unsigned msg_reg_nr,
2147 struct brw_reg src0,
2148 unsigned msg_control,
2149 unsigned binding_table_index,
2150 unsigned msg_length,
2151 unsigned response_length,
2152 bool eot,
2153 bool header_present)
2154 {
2155 struct brw_context *brw = p->brw;
2156 brw_inst *insn;
2157 unsigned msg_type;
2158 struct brw_reg dest;
2159
2160 if (dispatch_width == 16)
2161 dest = retype(vec16(brw_null_reg()), BRW_REGISTER_TYPE_UW);
2162 else
2163 dest = retype(vec8(brw_null_reg()), BRW_REGISTER_TYPE_UW);
2164
2165 if (brw->gen >= 6) {
2166 insn = next_insn(p, BRW_OPCODE_SENDC);
2167 } else {
2168 insn = next_insn(p, BRW_OPCODE_SEND);
2169 }
2170 brw_inst_set_qtr_control(brw, insn, BRW_COMPRESSION_NONE);
2171
2172 if (brw->gen >= 6) {
2173 /* headerless version, just submit color payload */
2174 src0 = brw_message_reg(msg_reg_nr);
2175
2176 msg_type = GEN6_DATAPORT_WRITE_MESSAGE_RENDER_TARGET_WRITE;
2177 } else {
2178 brw_inst_set_base_mrf(brw, insn, msg_reg_nr);
2179
2180 msg_type = BRW_DATAPORT_WRITE_MESSAGE_RENDER_TARGET_WRITE;
2181 }
2182
2183 brw_set_dest(p, insn, dest);
2184 brw_set_src0(p, insn, src0);
2185 brw_set_dp_write_message(p,
2186 insn,
2187 binding_table_index,
2188 msg_control,
2189 msg_type,
2190 msg_length,
2191 header_present,
2192 eot, /* last render target write */
2193 response_length,
2194 eot,
2195 0 /* send_commit_msg */);
2196 }
2197
2198
2199 /**
2200 * Texture sample instruction.
2201 * Note: the msg_type plus msg_length values determine exactly what kind
2202 * of sampling operation is performed. See volume 4, page 161 of docs.
2203 */
2204 void brw_SAMPLE(struct brw_compile *p,
2205 struct brw_reg dest,
2206 unsigned msg_reg_nr,
2207 struct brw_reg src0,
2208 unsigned binding_table_index,
2209 unsigned sampler,
2210 unsigned msg_type,
2211 unsigned response_length,
2212 unsigned msg_length,
2213 unsigned header_present,
2214 unsigned simd_mode,
2215 unsigned return_format)
2216 {
2217 struct brw_context *brw = p->brw;
2218 brw_inst *insn;
2219
2220 if (msg_reg_nr != -1)
2221 gen6_resolve_implied_move(p, &src0, msg_reg_nr);
2222
2223 insn = next_insn(p, BRW_OPCODE_SEND);
2224 brw_inst_set_pred_control(brw, insn, BRW_PREDICATE_NONE); /* XXX */
2225
2226 /* From the 965 PRM (volume 4, part 1, section 14.2.41):
2227 *
2228 * "Instruction compression is not allowed for this instruction (that
2229 * is, send). The hardware behavior is undefined if this instruction is
2230 * set as compressed. However, compress control can be set to "SecHalf"
2231 * to affect the EMask generation."
2232 *
2233 * No similar wording is found in later PRMs, but there are examples
2234 * utilizing send with SecHalf. More importantly, SIMD8 sampler messages
2235 * are allowed in SIMD16 mode and they could not work without SecHalf. For
2236 * these reasons, we allow BRW_COMPRESSION_2NDHALF here.
2237 */
2238 if (brw_inst_qtr_control(brw, insn) != BRW_COMPRESSION_2NDHALF)
2239 brw_inst_set_qtr_control(brw, insn, BRW_COMPRESSION_NONE);
2240
2241 if (brw->gen < 6)
2242 brw_inst_set_base_mrf(brw, insn, msg_reg_nr);
2243
2244 brw_set_dest(p, insn, dest);
2245 brw_set_src0(p, insn, src0);
2246 brw_set_sampler_message(p, insn,
2247 binding_table_index,
2248 sampler,
2249 msg_type,
2250 response_length,
2251 msg_length,
2252 header_present,
2253 simd_mode,
2254 return_format);
2255 }
2256
2257 /* All these variables are pretty confusing - we might be better off
2258 * using bitmasks and macros for this, in the old style. Or perhaps
2259 * just having the caller instantiate the fields in dword3 itself.
2260 */
2261 void brw_urb_WRITE(struct brw_compile *p,
2262 struct brw_reg dest,
2263 unsigned msg_reg_nr,
2264 struct brw_reg src0,
2265 enum brw_urb_write_flags flags,
2266 unsigned msg_length,
2267 unsigned response_length,
2268 unsigned offset,
2269 unsigned swizzle)
2270 {
2271 struct brw_context *brw = p->brw;
2272 brw_inst *insn;
2273
2274 gen6_resolve_implied_move(p, &src0, msg_reg_nr);
2275
2276 if (brw->gen >= 7 && !(flags & BRW_URB_WRITE_USE_CHANNEL_MASKS)) {
2277 /* Enable Channel Masks in the URB_WRITE_HWORD message header */
2278 brw_push_insn_state(p);
2279 brw_set_default_access_mode(p, BRW_ALIGN_1);
2280 brw_set_default_mask_control(p, BRW_MASK_DISABLE);
2281 brw_OR(p, retype(brw_vec1_reg(BRW_MESSAGE_REGISTER_FILE, msg_reg_nr, 5),
2282 BRW_REGISTER_TYPE_UD),
2283 retype(brw_vec1_grf(0, 5), BRW_REGISTER_TYPE_UD),
2284 brw_imm_ud(0xff00));
2285 brw_pop_insn_state(p);
2286 }
2287
2288 insn = next_insn(p, BRW_OPCODE_SEND);
2289
2290 assert(msg_length < BRW_MAX_MRF);
2291
2292 brw_set_dest(p, insn, dest);
2293 brw_set_src0(p, insn, src0);
2294 brw_set_src1(p, insn, brw_imm_d(0));
2295
2296 if (brw->gen < 6)
2297 brw_inst_set_base_mrf(brw, insn, msg_reg_nr);
2298
2299 brw_set_urb_message(p,
2300 insn,
2301 flags,
2302 msg_length,
2303 response_length,
2304 offset,
2305 swizzle);
2306 }
2307
2308 static int
2309 brw_find_next_block_end(struct brw_compile *p, int start_offset)
2310 {
2311 int offset;
2312 void *store = p->store;
2313 const struct brw_context *brw = p->brw;
2314
2315 for (offset = next_offset(brw, store, start_offset);
2316 offset < p->next_insn_offset;
2317 offset = next_offset(brw, store, offset)) {
2318 brw_inst *insn = store + offset;
2319
2320 switch (brw_inst_opcode(brw, insn)) {
2321 case BRW_OPCODE_ENDIF:
2322 case BRW_OPCODE_ELSE:
2323 case BRW_OPCODE_WHILE:
2324 case BRW_OPCODE_HALT:
2325 return offset;
2326 }
2327 }
2328
2329 return 0;
2330 }
2331
2332 /* There is no DO instruction on gen6, so to find the end of the loop
2333 * we have to see if the loop is jumping back before our start
2334 * instruction.
2335 */
2336 static int
2337 brw_find_loop_end(struct brw_compile *p, int start_offset)
2338 {
2339 struct brw_context *brw = p->brw;
2340 int offset;
2341 int scale = 8;
2342 void *store = p->store;
2343
2344 /* Always start after the instruction (such as a WHILE) we're trying to fix
2345 * up.
2346 */
2347 for (offset = next_offset(brw, store, start_offset);
2348 offset < p->next_insn_offset;
2349 offset = next_offset(brw, store, offset)) {
2350 brw_inst *insn = store + offset;
2351
2352 if (brw_inst_opcode(brw, insn) == BRW_OPCODE_WHILE) {
2353 int jip = brw->gen == 6 ? brw_inst_gen6_jump_count(brw, insn)
2354 : brw_inst_jip(brw, insn);
2355 if (offset + jip * scale <= start_offset)
2356 return offset;
2357 }
2358 }
2359 assert(!"not reached");
2360 return start_offset;
2361 }
2362
2363 /* After program generation, go back and update the UIP and JIP of
2364 * BREAK, CONT, and HALT instructions to their correct locations.
2365 */
2366 void
2367 brw_set_uip_jip(struct brw_compile *p)
2368 {
2369 struct brw_context *brw = p->brw;
2370 int offset;
2371 int scale = 8;
2372 void *store = p->store;
2373
2374 if (brw->gen < 6)
2375 return;
2376
2377 for (offset = 0; offset < p->next_insn_offset;
2378 offset = next_offset(brw, store, offset)) {
2379 brw_inst *insn = store + offset;
2380
2381 if (brw_inst_cmpt_control(brw, insn)) {
2382 /* Fixups for compacted BREAK/CONTINUE not supported yet. */
2383 assert(brw_inst_opcode(brw, insn) != BRW_OPCODE_BREAK &&
2384 brw_inst_opcode(brw, insn) != BRW_OPCODE_CONTINUE &&
2385 brw_inst_opcode(brw, insn) != BRW_OPCODE_HALT);
2386 continue;
2387 }
2388
2389 int block_end_offset = brw_find_next_block_end(p, offset);
2390 switch (brw_inst_opcode(brw, insn)) {
2391 case BRW_OPCODE_BREAK:
2392 assert(block_end_offset != 0);
2393 brw_inst_set_jip(brw, insn, (block_end_offset - offset) / scale);
2394 /* Gen7 UIP points to WHILE; Gen6 points just after it */
2395 brw_inst_set_uip(brw, insn,
2396 (brw_find_loop_end(p, offset) - offset +
2397 (brw->gen == 6 ? 16 : 0)) / scale);
2398 break;
2399 case BRW_OPCODE_CONTINUE:
2400 assert(block_end_offset != 0);
2401 brw_inst_set_jip(brw, insn, (block_end_offset - offset) / scale);
2402 brw_inst_set_uip(brw, insn,
2403 (brw_find_loop_end(p, offset) - offset) / scale);
2404
2405 assert(brw_inst_uip(brw, insn) != 0);
2406 assert(brw_inst_jip(brw, insn) != 0);
2407 break;
2408
2409 case BRW_OPCODE_ENDIF:
2410 if (block_end_offset == 0)
2411 brw_inst_set_jip(brw, insn, 2);
2412 else
2413 brw_inst_set_jip(brw, insn, (block_end_offset - offset) / scale);
2414 break;
2415
2416 case BRW_OPCODE_HALT:
2417 /* From the Sandy Bridge PRM (volume 4, part 2, section 8.3.19):
2418 *
2419 * "In case of the halt instruction not inside any conditional
2420 * code block, the value of <JIP> and <UIP> should be the
2421 * same. In case of the halt instruction inside conditional code
2422 * block, the <UIP> should be the end of the program, and the
2423 * <JIP> should be end of the most inner conditional code block."
2424 *
2425 * The uip will have already been set by whoever set up the
2426 * instruction.
2427 */
2428 if (block_end_offset == 0) {
2429 brw_inst_set_jip(brw, insn, brw_inst_uip(brw, insn));
2430 } else {
2431 brw_inst_set_jip(brw, insn, (block_end_offset - offset) / scale);
2432 }
2433 assert(brw_inst_uip(brw, insn) != 0);
2434 assert(brw_inst_jip(brw, insn) != 0);
2435 break;
2436 }
2437 }
2438 }
2439
2440 void brw_ff_sync(struct brw_compile *p,
2441 struct brw_reg dest,
2442 unsigned msg_reg_nr,
2443 struct brw_reg src0,
2444 bool allocate,
2445 unsigned response_length,
2446 bool eot)
2447 {
2448 struct brw_context *brw = p->brw;
2449 brw_inst *insn;
2450
2451 gen6_resolve_implied_move(p, &src0, msg_reg_nr);
2452
2453 insn = next_insn(p, BRW_OPCODE_SEND);
2454 brw_set_dest(p, insn, dest);
2455 brw_set_src0(p, insn, src0);
2456 brw_set_src1(p, insn, brw_imm_d(0));
2457
2458 if (brw->gen < 6)
2459 brw_inst_set_base_mrf(brw, insn, msg_reg_nr);
2460
2461 brw_set_ff_sync_message(p,
2462 insn,
2463 allocate,
2464 response_length,
2465 eot);
2466 }
2467
2468 /**
2469 * Emit the SEND instruction necessary to generate stream output data on Gen6
2470 * (for transform feedback).
2471 *
2472 * If send_commit_msg is true, this is the last piece of stream output data
2473 * from this thread, so send the data as a committed write. According to the
2474 * Sandy Bridge PRM (volume 2 part 1, section 4.5.1):
2475 *
2476 * "Prior to End of Thread with a URB_WRITE, the kernel must ensure all
2477 * writes are complete by sending the final write as a committed write."
2478 */
2479 void
2480 brw_svb_write(struct brw_compile *p,
2481 struct brw_reg dest,
2482 unsigned msg_reg_nr,
2483 struct brw_reg src0,
2484 unsigned binding_table_index,
2485 bool send_commit_msg)
2486 {
2487 brw_inst *insn;
2488
2489 gen6_resolve_implied_move(p, &src0, msg_reg_nr);
2490
2491 insn = next_insn(p, BRW_OPCODE_SEND);
2492 brw_set_dest(p, insn, dest);
2493 brw_set_src0(p, insn, src0);
2494 brw_set_src1(p, insn, brw_imm_d(0));
2495 brw_set_dp_write_message(p, insn,
2496 binding_table_index,
2497 0, /* msg_control: ignored */
2498 GEN6_DATAPORT_WRITE_MESSAGE_STREAMED_VB_WRITE,
2499 1, /* msg_length */
2500 true, /* header_present */
2501 0, /* last_render_target: ignored */
2502 send_commit_msg, /* response_length */
2503 0, /* end_of_thread */
2504 send_commit_msg); /* send_commit_msg */
2505 }
2506
2507 static void
2508 brw_set_dp_untyped_atomic_message(struct brw_compile *p,
2509 brw_inst *insn,
2510 unsigned atomic_op,
2511 unsigned bind_table_index,
2512 unsigned msg_length,
2513 unsigned response_length,
2514 bool header_present)
2515 {
2516 const struct brw_context *brw = p->brw;
2517
2518 unsigned msg_control =
2519 atomic_op | /* Atomic Operation Type: BRW_AOP_* */
2520 (response_length ? 1 << 5 : 0); /* Return data expected */
2521
2522 if (brw->gen >= 8 || brw->is_haswell) {
2523 brw_set_message_descriptor(p, insn, HSW_SFID_DATAPORT_DATA_CACHE_1,
2524 msg_length, response_length,
2525 header_present, false);
2526
2527
2528 if (brw_inst_access_mode(brw, insn) == BRW_ALIGN_1) {
2529 if (brw_inst_exec_size(brw, insn) != BRW_EXECUTE_16)
2530 msg_control |= 1 << 4; /* SIMD8 mode */
2531
2532 brw_inst_set_dp_msg_type(brw, insn,
2533 HSW_DATAPORT_DC_PORT1_UNTYPED_ATOMIC_OP);
2534 } else {
2535 brw_inst_set_dp_msg_type(brw, insn,
2536 HSW_DATAPORT_DC_PORT1_UNTYPED_ATOMIC_OP_SIMD4X2);
2537 }
2538 } else {
2539 brw_set_message_descriptor(p, insn, GEN7_SFID_DATAPORT_DATA_CACHE,
2540 msg_length, response_length,
2541 header_present, false);
2542
2543 brw_inst_set_dp_msg_type(brw, insn, GEN7_DATAPORT_DC_UNTYPED_ATOMIC_OP);
2544
2545 if (brw_inst_exec_size(brw, insn) != BRW_EXECUTE_16)
2546 msg_control |= 1 << 4; /* SIMD8 mode */
2547 }
2548
2549 brw_inst_set_binding_table_index(brw, insn, bind_table_index);
2550 brw_inst_set_dp_msg_control(brw, insn, msg_control);
2551 }
2552
2553 void
2554 brw_untyped_atomic(struct brw_compile *p,
2555 struct brw_reg dest,
2556 struct brw_reg mrf,
2557 unsigned atomic_op,
2558 unsigned bind_table_index,
2559 unsigned msg_length,
2560 unsigned response_length) {
2561 const struct brw_context *brw = p->brw;
2562 brw_inst *insn = brw_next_insn(p, BRW_OPCODE_SEND);
2563
2564 brw_set_dest(p, insn, retype(dest, BRW_REGISTER_TYPE_UD));
2565 brw_set_src0(p, insn, retype(mrf, BRW_REGISTER_TYPE_UD));
2566 brw_set_src1(p, insn, brw_imm_d(0));
2567 brw_set_dp_untyped_atomic_message(
2568 p, insn, atomic_op, bind_table_index, msg_length, response_length,
2569 brw_inst_access_mode(brw, insn) == BRW_ALIGN_1);
2570 }
2571
2572 static void
2573 brw_set_dp_untyped_surface_read_message(struct brw_compile *p,
2574 brw_inst *insn,
2575 unsigned bind_table_index,
2576 unsigned msg_length,
2577 unsigned response_length,
2578 bool header_present)
2579 {
2580 const struct brw_context *brw = p->brw;
2581 const unsigned dispatch_width =
2582 (brw_inst_exec_size(brw, insn) == BRW_EXECUTE_16 ? 16 : 8);
2583 const unsigned num_channels = response_length / (dispatch_width / 8);
2584
2585 if (brw->gen >= 8 || brw->is_haswell) {
2586 brw_set_message_descriptor(p, insn, HSW_SFID_DATAPORT_DATA_CACHE_1,
2587 msg_length, response_length,
2588 header_present, false);
2589
2590 brw_inst_set_dp_msg_type(brw, insn,
2591 HSW_DATAPORT_DC_PORT1_UNTYPED_SURFACE_READ);
2592 } else {
2593 brw_set_message_descriptor(p, insn, GEN7_SFID_DATAPORT_DATA_CACHE,
2594 msg_length, response_length,
2595 header_present, false);
2596
2597 brw_inst_set_dp_msg_type(brw, insn,
2598 GEN7_DATAPORT_DC_UNTYPED_SURFACE_READ);
2599 }
2600
2601 /* Set mask of 32-bit channels to drop. */
2602 unsigned msg_control = (0xf & (0xf << num_channels));
2603
2604 if (brw_inst_access_mode(brw, insn) == BRW_ALIGN_1) {
2605 if (dispatch_width == 16)
2606 msg_control |= 1 << 4; /* SIMD16 mode */
2607 else
2608 msg_control |= 2 << 4; /* SIMD8 mode */
2609 }
2610
2611 brw_inst_set_binding_table_index(brw, insn, bind_table_index);
2612 brw_inst_set_dp_msg_control(brw, insn, msg_control);
2613 }
2614
2615 void
2616 brw_untyped_surface_read(struct brw_compile *p,
2617 struct brw_reg dest,
2618 struct brw_reg mrf,
2619 unsigned bind_table_index,
2620 unsigned msg_length,
2621 unsigned response_length)
2622 {
2623 const struct brw_context *brw = p->brw;
2624 brw_inst *insn = next_insn(p, BRW_OPCODE_SEND);
2625
2626 brw_set_dest(p, insn, retype(dest, BRW_REGISTER_TYPE_UD));
2627 brw_set_src0(p, insn, retype(mrf, BRW_REGISTER_TYPE_UD));
2628 brw_set_dp_untyped_surface_read_message(
2629 p, insn, bind_table_index, msg_length, response_length,
2630 brw_inst_access_mode(brw, insn) == BRW_ALIGN_1);
2631 }
2632
2633 void
2634 brw_pixel_interpolator_query(struct brw_compile *p,
2635 struct brw_reg dest,
2636 struct brw_reg mrf,
2637 bool noperspective,
2638 unsigned mode,
2639 unsigned data,
2640 unsigned msg_length,
2641 unsigned response_length)
2642 {
2643 const struct brw_context *brw = p->brw;
2644 struct brw_inst *insn = next_insn(p, BRW_OPCODE_SEND);
2645
2646 brw_set_dest(p, insn, dest);
2647 brw_set_src0(p, insn, mrf);
2648 brw_set_message_descriptor(p, insn, GEN7_SFID_PIXEL_INTERPOLATOR,
2649 msg_length, response_length,
2650 false /* header is never present for PI */,
2651 false);
2652
2653 brw_inst_set_pi_simd_mode(
2654 brw, insn, brw_inst_exec_size(brw, insn) == BRW_EXECUTE_16);
2655 brw_inst_set_pi_slot_group(brw, insn, 0); /* zero unless 32/64px dispatch */
2656 brw_inst_set_pi_nopersp(brw, insn, noperspective);
2657 brw_inst_set_pi_message_type(brw, insn, mode);
2658 brw_inst_set_pi_message_data(brw, insn, data);
2659 }
2660
2661 /**
2662 * This instruction is generated as a single-channel align1 instruction by
2663 * both the VS and FS stages when using INTEL_DEBUG=shader_time.
2664 *
2665 * We can't use the typed atomic op in the FS because that has the execution
2666 * mask ANDed with the pixel mask, but we just want to write the one dword for
2667 * all the pixels.
2668 *
2669 * We don't use the SIMD4x2 atomic ops in the VS because want to just write
2670 * one u32. So we use the same untyped atomic write message as the pixel
2671 * shader.
2672 *
2673 * The untyped atomic operation requires a BUFFER surface type with RAW
2674 * format, and is only accessible through the legacy DATA_CACHE dataport
2675 * messages.
2676 */
2677 void brw_shader_time_add(struct brw_compile *p,
2678 struct brw_reg payload,
2679 uint32_t surf_index)
2680 {
2681 assert(p->brw->gen >= 7);
2682
2683 brw_push_insn_state(p);
2684 brw_set_default_access_mode(p, BRW_ALIGN_1);
2685 brw_set_default_mask_control(p, BRW_MASK_DISABLE);
2686 brw_inst *send = brw_next_insn(p, BRW_OPCODE_SEND);
2687 brw_pop_insn_state(p);
2688
2689 /* We use brw_vec1_reg and unmasked because we want to increment the given
2690 * offset only once.
2691 */
2692 brw_set_dest(p, send, brw_vec1_reg(BRW_ARCHITECTURE_REGISTER_FILE,
2693 BRW_ARF_NULL, 0));
2694 brw_set_src0(p, send, brw_vec1_reg(payload.file,
2695 payload.nr, 0));
2696 brw_set_dp_untyped_atomic_message(p, send, BRW_AOP_ADD, surf_index,
2697 2 /* message length */,
2698 0 /* response length */,
2699 false /* header present */);
2700 }