projects / mesa.git / blob
? search:
summary | shortlog | log | commit | commitdiff | tree
history | raw | HEAD
radv: add a workaround for Monster Hunter World and LLVM 7&8
[mesa.git] / src / amd / common / ac_llvm_build.c
1 /*
2 * Copyright 2014 Advanced Micro Devices, Inc.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sub license, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
13 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
14 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
15 * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
16 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
17 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
18 * USE OR OTHER DEALINGS IN THE SOFTWARE.
19 *
20 * The above copyright notice and this permission notice (including the
21 * next paragraph) shall be included in all copies or substantial portions
22 * of the Software.
23 *
24 */
25 /* based on pieces from si_pipe.c and radeon_llvm_emit.c */
26 #include "ac_llvm_build.h"
27
28 #include <llvm-c/Core.h>
29
30 #include "c11/threads.h"
31
32 #include <assert.h>
33 #include <stdio.h>
34
35 #include "ac_llvm_util.h"
36 #include "ac_exp_param.h"
37 #include "util/bitscan.h"
38 #include "util/macros.h"
39 #include "util/u_atomic.h"
40 #include "util/u_math.h"
41 #include "sid.h"
42
43 #include "shader_enums.h"
44
45 #define AC_LLVM_INITIAL_CF_DEPTH 4
46
47 /* Data for if/else/endif and bgnloop/endloop control flow structures.
48 */
49 struct ac_llvm_flow {
50 /* Loop exit or next part of if/else/endif. */
51 LLVMBasicBlockRef next_block;
52 LLVMBasicBlockRef loop_entry_block;
53 };
54
55 /* Initialize module-independent parts of the context.
56 *
57 * The caller is responsible for initializing ctx::module and ctx::builder.
58 */
59 void
60 ac_llvm_context_init(struct ac_llvm_context *ctx,
61 enum chip_class chip_class, enum radeon_family family)
62 {
63 LLVMValueRef args[1];
64
65 ctx->context = LLVMContextCreate();
66
67 ctx->chip_class = chip_class;
68 ctx->family = family;
69 ctx->module = NULL;
70 ctx->builder = NULL;
71
72 ctx->voidt = LLVMVoidTypeInContext(ctx->context);
73 ctx->i1 = LLVMInt1TypeInContext(ctx->context);
74 ctx->i8 = LLVMInt8TypeInContext(ctx->context);
75 ctx->i16 = LLVMIntTypeInContext(ctx->context, 16);
76 ctx->i32 = LLVMIntTypeInContext(ctx->context, 32);
77 ctx->i64 = LLVMIntTypeInContext(ctx->context, 64);
78 ctx->intptr = ctx->i32;
79 ctx->f16 = LLVMHalfTypeInContext(ctx->context);
80 ctx->f32 = LLVMFloatTypeInContext(ctx->context);
81 ctx->f64 = LLVMDoubleTypeInContext(ctx->context);
82 ctx->v2i16 = LLVMVectorType(ctx->i16, 2);
83 ctx->v2i32 = LLVMVectorType(ctx->i32, 2);
84 ctx->v3i32 = LLVMVectorType(ctx->i32, 3);
85 ctx->v4i32 = LLVMVectorType(ctx->i32, 4);
86 ctx->v2f32 = LLVMVectorType(ctx->f32, 2);
87 ctx->v4f32 = LLVMVectorType(ctx->f32, 4);
88 ctx->v8i32 = LLVMVectorType(ctx->i32, 8);
89
90 ctx->i8_0 = LLVMConstInt(ctx->i8, 0, false);
91 ctx->i8_1 = LLVMConstInt(ctx->i8, 1, false);
92 ctx->i16_0 = LLVMConstInt(ctx->i16, 0, false);
93 ctx->i16_1 = LLVMConstInt(ctx->i16, 1, false);
94 ctx->i32_0 = LLVMConstInt(ctx->i32, 0, false);
95 ctx->i32_1 = LLVMConstInt(ctx->i32, 1, false);
96 ctx->i64_0 = LLVMConstInt(ctx->i64, 0, false);
97 ctx->i64_1 = LLVMConstInt(ctx->i64, 1, false);
98 ctx->f16_0 = LLVMConstReal(ctx->f16, 0.0);
99 ctx->f16_1 = LLVMConstReal(ctx->f16, 1.0);
100 ctx->f32_0 = LLVMConstReal(ctx->f32, 0.0);
101 ctx->f32_1 = LLVMConstReal(ctx->f32, 1.0);
102 ctx->f64_0 = LLVMConstReal(ctx->f64, 0.0);
103 ctx->f64_1 = LLVMConstReal(ctx->f64, 1.0);
104
105 ctx->i1false = LLVMConstInt(ctx->i1, 0, false);
106 ctx->i1true = LLVMConstInt(ctx->i1, 1, false);
107
108 ctx->range_md_kind = LLVMGetMDKindIDInContext(ctx->context,
109 "range", 5);
110
111 ctx->invariant_load_md_kind = LLVMGetMDKindIDInContext(ctx->context,
112 "invariant.load", 14);
113
114 ctx->fpmath_md_kind = LLVMGetMDKindIDInContext(ctx->context, "fpmath", 6);
115
116 args[0] = LLVMConstReal(ctx->f32, 2.5);
117 ctx->fpmath_md_2p5_ulp = LLVMMDNodeInContext(ctx->context, args, 1);
118
119 ctx->uniform_md_kind = LLVMGetMDKindIDInContext(ctx->context,
120 "amdgpu.uniform", 14);
121
122 ctx->empty_md = LLVMMDNodeInContext(ctx->context, NULL, 0);
123 }
124
125 void
126 ac_llvm_context_dispose(struct ac_llvm_context *ctx)
127 {
128 free(ctx->flow);
129 ctx->flow = NULL;
130 ctx->flow_depth_max = 0;
131 }
132
133 int
134 ac_get_llvm_num_components(LLVMValueRef value)
135 {
136 LLVMTypeRef type = LLVMTypeOf(value);
137 unsigned num_components = LLVMGetTypeKind(type) == LLVMVectorTypeKind
138 ? LLVMGetVectorSize(type)
139 : 1;
140 return num_components;
141 }
142
143 LLVMValueRef
144 ac_llvm_extract_elem(struct ac_llvm_context *ac,
145 LLVMValueRef value,
146 int index)
147 {
148 if (LLVMGetTypeKind(LLVMTypeOf(value)) != LLVMVectorTypeKind) {
149 assert(index == 0);
150 return value;
151 }
152
153 return LLVMBuildExtractElement(ac->builder, value,
154 LLVMConstInt(ac->i32, index, false), "");
155 }
156
157 int
158 ac_get_elem_bits(struct ac_llvm_context *ctx, LLVMTypeRef type)
159 {
160 if (LLVMGetTypeKind(type) == LLVMVectorTypeKind)
161 type = LLVMGetElementType(type);
162
163 if (LLVMGetTypeKind(type) == LLVMIntegerTypeKind)
164 return LLVMGetIntTypeWidth(type);
165
166 if (type == ctx->f16)
167 return 16;
168 if (type == ctx->f32)
169 return 32;
170 if (type == ctx->f64)
171 return 64;
172
173 unreachable("Unhandled type kind in get_elem_bits");
174 }
175
176 unsigned
177 ac_get_type_size(LLVMTypeRef type)
178 {
179 LLVMTypeKind kind = LLVMGetTypeKind(type);
180
181 switch (kind) {
182 case LLVMIntegerTypeKind:
183 return LLVMGetIntTypeWidth(type) / 8;
184 case LLVMHalfTypeKind:
185 return 2;
186 case LLVMFloatTypeKind:
187 return 4;
188 case LLVMDoubleTypeKind:
189 return 8;
190 case LLVMPointerTypeKind:
191 if (LLVMGetPointerAddressSpace(type) == AC_ADDR_SPACE_CONST_32BIT)
192 return 4;
193 return 8;
194 case LLVMVectorTypeKind:
195 return LLVMGetVectorSize(type) *
196 ac_get_type_size(LLVMGetElementType(type));
197 case LLVMArrayTypeKind:
198 return LLVMGetArrayLength(type) *
199 ac_get_type_size(LLVMGetElementType(type));
200 default:
201 assert(0);
202 return 0;
203 }
204 }
205
206 static LLVMTypeRef to_integer_type_scalar(struct ac_llvm_context *ctx, LLVMTypeRef t)
207 {
208 if (t == ctx->i8)
209 return ctx->i8;
210 else if (t == ctx->f16 || t == ctx->i16)
211 return ctx->i16;
212 else if (t == ctx->f32 || t == ctx->i32)
213 return ctx->i32;
214 else if (t == ctx->f64 || t == ctx->i64)
215 return ctx->i64;
216 else
217 unreachable("Unhandled integer size");
218 }
219
220 LLVMTypeRef
221 ac_to_integer_type(struct ac_llvm_context *ctx, LLVMTypeRef t)
222 {
223 if (LLVMGetTypeKind(t) == LLVMVectorTypeKind) {
224 LLVMTypeRef elem_type = LLVMGetElementType(t);
225 return LLVMVectorType(to_integer_type_scalar(ctx, elem_type),
226 LLVMGetVectorSize(t));
227 }
228 if (LLVMGetTypeKind(t) == LLVMPointerTypeKind) {
229 switch (LLVMGetPointerAddressSpace(t)) {
230 case AC_ADDR_SPACE_GLOBAL:
231 return ctx->i64;
232 case AC_ADDR_SPACE_LDS:
233 return ctx->i32;
234 default:
235 unreachable("unhandled address space");
236 }
237 }
238 return to_integer_type_scalar(ctx, t);
239 }
240
241 LLVMValueRef
242 ac_to_integer(struct ac_llvm_context *ctx, LLVMValueRef v)
243 {
244 LLVMTypeRef type = LLVMTypeOf(v);
245 if (LLVMGetTypeKind(type) == LLVMPointerTypeKind) {
246 return LLVMBuildPtrToInt(ctx->builder, v, ac_to_integer_type(ctx, type), "");
247 }
248 return LLVMBuildBitCast(ctx->builder, v, ac_to_integer_type(ctx, type), "");
249 }
250
251 LLVMValueRef
252 ac_to_integer_or_pointer(struct ac_llvm_context *ctx, LLVMValueRef v)
253 {
254 LLVMTypeRef type = LLVMTypeOf(v);
255 if (LLVMGetTypeKind(type) == LLVMPointerTypeKind)
256 return v;
257 return ac_to_integer(ctx, v);
258 }
259
260 static LLVMTypeRef to_float_type_scalar(struct ac_llvm_context *ctx, LLVMTypeRef t)
261 {
262 if (t == ctx->i8)
263 return ctx->i8;
264 else if (t == ctx->i16 || t == ctx->f16)
265 return ctx->f16;
266 else if (t == ctx->i32 || t == ctx->f32)
267 return ctx->f32;
268 else if (t == ctx->i64 || t == ctx->f64)
269 return ctx->f64;
270 else
271 unreachable("Unhandled float size");
272 }
273
274 LLVMTypeRef
275 ac_to_float_type(struct ac_llvm_context *ctx, LLVMTypeRef t)
276 {
277 if (LLVMGetTypeKind(t) == LLVMVectorTypeKind) {
278 LLVMTypeRef elem_type = LLVMGetElementType(t);
279 return LLVMVectorType(to_float_type_scalar(ctx, elem_type),
280 LLVMGetVectorSize(t));
281 }
282 return to_float_type_scalar(ctx, t);
283 }
284
285 LLVMValueRef
286 ac_to_float(struct ac_llvm_context *ctx, LLVMValueRef v)
287 {
288 LLVMTypeRef type = LLVMTypeOf(v);
289 return LLVMBuildBitCast(ctx->builder, v, ac_to_float_type(ctx, type), "");
290 }
291
292
293 LLVMValueRef
294 ac_build_intrinsic(struct ac_llvm_context *ctx, const char *name,
295 LLVMTypeRef return_type, LLVMValueRef *params,
296 unsigned param_count, unsigned attrib_mask)
297 {
298 LLVMValueRef function, call;
299 bool set_callsite_attrs = !(attrib_mask & AC_FUNC_ATTR_LEGACY);
300
301 function = LLVMGetNamedFunction(ctx->module, name);
302 if (!function) {
303 LLVMTypeRef param_types[32], function_type;
304 unsigned i;
305
306 assert(param_count <= 32);
307
308 for (i = 0; i < param_count; ++i) {
309 assert(params[i]);
310 param_types[i] = LLVMTypeOf(params[i]);
311 }
312 function_type =
313 LLVMFunctionType(return_type, param_types, param_count, 0);
314 function = LLVMAddFunction(ctx->module, name, function_type);
315
316 LLVMSetFunctionCallConv(function, LLVMCCallConv);
317 LLVMSetLinkage(function, LLVMExternalLinkage);
318
319 if (!set_callsite_attrs)
320 ac_add_func_attributes(ctx->context, function, attrib_mask);
321 }
322
323 call = LLVMBuildCall(ctx->builder, function, params, param_count, "");
324 if (set_callsite_attrs)
325 ac_add_func_attributes(ctx->context, call, attrib_mask);
326 return call;
327 }
328
329 /**
330 * Given the i32 or vNi32 \p type, generate the textual name (e.g. for use with
331 * intrinsic names).
332 */
333 void ac_build_type_name_for_intr(LLVMTypeRef type, char *buf, unsigned bufsize)
334 {
335 LLVMTypeRef elem_type = type;
336
337 assert(bufsize >= 8);
338
339 if (LLVMGetTypeKind(type) == LLVMVectorTypeKind) {
340 int ret = snprintf(buf, bufsize, "v%u",
341 LLVMGetVectorSize(type));
342 if (ret < 0) {
343 char *type_name = LLVMPrintTypeToString(type);
344 fprintf(stderr, "Error building type name for: %s\n",
345 type_name);
346 return;
347 }
348 elem_type = LLVMGetElementType(type);
349 buf += ret;
350 bufsize -= ret;
351 }
352 switch (LLVMGetTypeKind(elem_type)) {
353 default: break;
354 case LLVMIntegerTypeKind:
355 snprintf(buf, bufsize, "i%d", LLVMGetIntTypeWidth(elem_type));
356 break;
357 case LLVMHalfTypeKind:
358 snprintf(buf, bufsize, "f16");
359 break;
360 case LLVMFloatTypeKind:
361 snprintf(buf, bufsize, "f32");
362 break;
363 case LLVMDoubleTypeKind:
364 snprintf(buf, bufsize, "f64");
365 break;
366 }
367 }
368
369 /**
370 * Helper function that builds an LLVM IR PHI node and immediately adds
371 * incoming edges.
372 */
373 LLVMValueRef
374 ac_build_phi(struct ac_llvm_context *ctx, LLVMTypeRef type,
375 unsigned count_incoming, LLVMValueRef *values,
376 LLVMBasicBlockRef *blocks)
377 {
378 LLVMValueRef phi = LLVMBuildPhi(ctx->builder, type, "");
379 LLVMAddIncoming(phi, values, blocks, count_incoming);
380 return phi;
381 }
382
383 void ac_build_s_barrier(struct ac_llvm_context *ctx)
384 {
385 ac_build_intrinsic(ctx, "llvm.amdgcn.s.barrier", ctx->voidt, NULL,
386 0, AC_FUNC_ATTR_CONVERGENT);
387 }
388
389 /* Prevent optimizations (at least of memory accesses) across the current
390 * point in the program by emitting empty inline assembly that is marked as
391 * having side effects.
392 *
393 * Optionally, a value can be passed through the inline assembly to prevent
394 * LLVM from hoisting calls to ReadNone functions.
395 */
396 void
397 ac_build_optimization_barrier(struct ac_llvm_context *ctx,
398 LLVMValueRef *pvgpr)
399 {
400 static int counter = 0;
401
402 LLVMBuilderRef builder = ctx->builder;
403 char code[16];
404
405 snprintf(code, sizeof(code), "; %d", p_atomic_inc_return(&counter));
406
407 if (!pvgpr) {
408 LLVMTypeRef ftype = LLVMFunctionType(ctx->voidt, NULL, 0, false);
409 LLVMValueRef inlineasm = LLVMConstInlineAsm(ftype, code, "", true, false);
410 LLVMBuildCall(builder, inlineasm, NULL, 0, "");
411 } else {
412 LLVMTypeRef ftype = LLVMFunctionType(ctx->i32, &ctx->i32, 1, false);
413 LLVMValueRef inlineasm = LLVMConstInlineAsm(ftype, code, "=v,0", true, false);
414 LLVMValueRef vgpr = *pvgpr;
415 LLVMTypeRef vgpr_type = LLVMTypeOf(vgpr);
416 unsigned vgpr_size = ac_get_type_size(vgpr_type);
417 LLVMValueRef vgpr0;
418
419 assert(vgpr_size % 4 == 0);
420
421 vgpr = LLVMBuildBitCast(builder, vgpr, LLVMVectorType(ctx->i32, vgpr_size / 4), "");
422 vgpr0 = LLVMBuildExtractElement(builder, vgpr, ctx->i32_0, "");
423 vgpr0 = LLVMBuildCall(builder, inlineasm, &vgpr0, 1, "");
424 vgpr = LLVMBuildInsertElement(builder, vgpr, vgpr0, ctx->i32_0, "");
425 vgpr = LLVMBuildBitCast(builder, vgpr, vgpr_type, "");
426
427 *pvgpr = vgpr;
428 }
429 }
430
431 LLVMValueRef
432 ac_build_shader_clock(struct ac_llvm_context *ctx)
433 {
434 LLVMValueRef tmp = ac_build_intrinsic(ctx, "llvm.readcyclecounter",
435 ctx->i64, NULL, 0, 0);
436 return LLVMBuildBitCast(ctx->builder, tmp, ctx->v2i32, "");
437 }
438
439 LLVMValueRef
440 ac_build_ballot(struct ac_llvm_context *ctx,
441 LLVMValueRef value)
442 {
443 LLVMValueRef args[3] = {
444 value,
445 ctx->i32_0,
446 LLVMConstInt(ctx->i32, LLVMIntNE, 0)
447 };
448
449 /* We currently have no other way to prevent LLVM from lifting the icmp
450 * calls to a dominating basic block.
451 */
452 ac_build_optimization_barrier(ctx, &args[0]);
453
454 args[0] = ac_to_integer(ctx, args[0]);
455
456 return ac_build_intrinsic(ctx,
457 "llvm.amdgcn.icmp.i32",
458 ctx->i64, args, 3,
459 AC_FUNC_ATTR_NOUNWIND |
460 AC_FUNC_ATTR_READNONE |
461 AC_FUNC_ATTR_CONVERGENT);
462 }
463
464 LLVMValueRef ac_get_i1_sgpr_mask(struct ac_llvm_context *ctx,
465 LLVMValueRef value)
466 {
467 LLVMValueRef args[3] = {
468 value,
469 ctx->i1false,
470 LLVMConstInt(ctx->i32, LLVMIntNE, 0),
471 };
472
473 assert(HAVE_LLVM >= 0x0800);
474 return ac_build_intrinsic(ctx, "llvm.amdgcn.icmp.i1", ctx->i64, args, 3,
475 AC_FUNC_ATTR_NOUNWIND |
476 AC_FUNC_ATTR_READNONE |
477 AC_FUNC_ATTR_CONVERGENT);
478 }
479
480 LLVMValueRef
481 ac_build_vote_all(struct ac_llvm_context *ctx, LLVMValueRef value)
482 {
483 LLVMValueRef active_set = ac_build_ballot(ctx, ctx->i32_1);
484 LLVMValueRef vote_set = ac_build_ballot(ctx, value);
485 return LLVMBuildICmp(ctx->builder, LLVMIntEQ, vote_set, active_set, "");
486 }
487
488 LLVMValueRef
489 ac_build_vote_any(struct ac_llvm_context *ctx, LLVMValueRef value)
490 {
491 LLVMValueRef vote_set = ac_build_ballot(ctx, value);
492 return LLVMBuildICmp(ctx->builder, LLVMIntNE, vote_set,
493 LLVMConstInt(ctx->i64, 0, 0), "");
494 }
495
496 LLVMValueRef
497 ac_build_vote_eq(struct ac_llvm_context *ctx, LLVMValueRef value)
498 {
499 LLVMValueRef active_set = ac_build_ballot(ctx, ctx->i32_1);
500 LLVMValueRef vote_set = ac_build_ballot(ctx, value);
501
502 LLVMValueRef all = LLVMBuildICmp(ctx->builder, LLVMIntEQ,
503 vote_set, active_set, "");
504 LLVMValueRef none = LLVMBuildICmp(ctx->builder, LLVMIntEQ,
505 vote_set,
506 LLVMConstInt(ctx->i64, 0, 0), "");
507 return LLVMBuildOr(ctx->builder, all, none, "");
508 }
509
510 LLVMValueRef
511 ac_build_varying_gather_values(struct ac_llvm_context *ctx, LLVMValueRef *values,
512 unsigned value_count, unsigned component)
513 {
514 LLVMValueRef vec = NULL;
515
516 if (value_count == 1) {
517 return values[component];
518 } else if (!value_count)
519 unreachable("value_count is 0");
520
521 for (unsigned i = component; i < value_count + component; i++) {
522 LLVMValueRef value = values[i];
523
524 if (i == component)
525 vec = LLVMGetUndef( LLVMVectorType(LLVMTypeOf(value), value_count));
526 LLVMValueRef index = LLVMConstInt(ctx->i32, i - component, false);
527 vec = LLVMBuildInsertElement(ctx->builder, vec, value, index, "");
528 }
529 return vec;
530 }
531
532 LLVMValueRef
533 ac_build_gather_values_extended(struct ac_llvm_context *ctx,
534 LLVMValueRef *values,
535 unsigned value_count,
536 unsigned value_stride,
537 bool load,
538 bool always_vector)
539 {
540 LLVMBuilderRef builder = ctx->builder;
541 LLVMValueRef vec = NULL;
542 unsigned i;
543
544 if (value_count == 1 && !always_vector) {
545 if (load)
546 return LLVMBuildLoad(builder, values[0], "");
547 return values[0];
548 } else if (!value_count)
549 unreachable("value_count is 0");
550
551 for (i = 0; i < value_count; i++) {
552 LLVMValueRef value = values[i * value_stride];
553 if (load)
554 value = LLVMBuildLoad(builder, value, "");
555
556 if (!i)
557 vec = LLVMGetUndef( LLVMVectorType(LLVMTypeOf(value), value_count));
558 LLVMValueRef index = LLVMConstInt(ctx->i32, i, false);
559 vec = LLVMBuildInsertElement(builder, vec, value, index, "");
560 }
561 return vec;
562 }
563
564 LLVMValueRef
565 ac_build_gather_values(struct ac_llvm_context *ctx,
566 LLVMValueRef *values,
567 unsigned value_count)
568 {
569 return ac_build_gather_values_extended(ctx, values, value_count, 1, false, false);
570 }
571
572 /* Expand a scalar or vector to <dst_channels x type> by filling the remaining
573 * channels with undef. Extract at most src_channels components from the input.
574 */
575 static LLVMValueRef
576 ac_build_expand(struct ac_llvm_context *ctx,
577 LLVMValueRef value,
578 unsigned src_channels,
579 unsigned dst_channels)
580 {
581 LLVMTypeRef elemtype;
582 LLVMValueRef chan[dst_channels];
583
584 if (LLVMGetTypeKind(LLVMTypeOf(value)) == LLVMVectorTypeKind) {
585 unsigned vec_size = LLVMGetVectorSize(LLVMTypeOf(value));
586
587 if (src_channels == dst_channels && vec_size == dst_channels)
588 return value;
589
590 src_channels = MIN2(src_channels, vec_size);
591
592 for (unsigned i = 0; i < src_channels; i++)
593 chan[i] = ac_llvm_extract_elem(ctx, value, i);
594
595 elemtype = LLVMGetElementType(LLVMTypeOf(value));
596 } else {
597 if (src_channels) {
598 assert(src_channels == 1);
599 chan[0] = value;
600 }
601 elemtype = LLVMTypeOf(value);
602 }
603
604 for (unsigned i = src_channels; i < dst_channels; i++)
605 chan[i] = LLVMGetUndef(elemtype);
606
607 return ac_build_gather_values(ctx, chan, dst_channels);
608 }
609
610 /* Expand a scalar or vector to <4 x type> by filling the remaining channels
611 * with undef. Extract at most num_channels components from the input.
612 */
613 LLVMValueRef ac_build_expand_to_vec4(struct ac_llvm_context *ctx,
614 LLVMValueRef value,
615 unsigned num_channels)
616 {
617 return ac_build_expand(ctx, value, num_channels, 4);
618 }
619
620 LLVMValueRef ac_build_round(struct ac_llvm_context *ctx, LLVMValueRef value)
621 {
622 unsigned type_size = ac_get_type_size(LLVMTypeOf(value));
623 const char *name;
624
625 if (type_size == 2)
626 name = "llvm.rint.f16";
627 else if (type_size == 4)
628 name = "llvm.rint.f32";
629 else
630 name = "llvm.rint.f64";
631
632 return ac_build_intrinsic(ctx, name, LLVMTypeOf(value), &value, 1,
633 AC_FUNC_ATTR_READNONE);
634 }
635
636 LLVMValueRef
637 ac_build_fdiv(struct ac_llvm_context *ctx,
638 LLVMValueRef num,
639 LLVMValueRef den)
640 {
641 /* If we do (num / den), LLVM >= 7.0 does:
642 * return num * v_rcp_f32(den * (fabs(den) > 0x1.0p+96f ? 0x1.0p-32f : 1.0f));
643 *
644 * If we do (num * (1 / den)), LLVM does:
645 * return num * v_rcp_f32(den);
646 */
647 LLVMValueRef one = LLVMConstReal(LLVMTypeOf(num), 1.0);
648 LLVMValueRef rcp = LLVMBuildFDiv(ctx->builder, one, den, "");
649 LLVMValueRef ret = LLVMBuildFMul(ctx->builder, num, rcp, "");
650
651 /* Use v_rcp_f32 instead of precise division. */
652 if (!LLVMIsConstant(ret))
653 LLVMSetMetadata(ret, ctx->fpmath_md_kind, ctx->fpmath_md_2p5_ulp);
654 return ret;
655 }
656
657 /* See fast_idiv_by_const.h. */
658 /* Set: increment = util_fast_udiv_info::increment ? multiplier : 0; */
659 LLVMValueRef ac_build_fast_udiv(struct ac_llvm_context *ctx,
660 LLVMValueRef num,
661 LLVMValueRef multiplier,
662 LLVMValueRef pre_shift,
663 LLVMValueRef post_shift,
664 LLVMValueRef increment)
665 {
666 LLVMBuilderRef builder = ctx->builder;
667
668 num = LLVMBuildLShr(builder, num, pre_shift, "");
669 num = LLVMBuildMul(builder,
670 LLVMBuildZExt(builder, num, ctx->i64, ""),
671 LLVMBuildZExt(builder, multiplier, ctx->i64, ""), "");
672 num = LLVMBuildAdd(builder, num,
673 LLVMBuildZExt(builder, increment, ctx->i64, ""), "");
674 num = LLVMBuildLShr(builder, num, LLVMConstInt(ctx->i64, 32, 0), "");
675 num = LLVMBuildTrunc(builder, num, ctx->i32, "");
676 return LLVMBuildLShr(builder, num, post_shift, "");
677 }
678
679 /* See fast_idiv_by_const.h. */
680 /* If num != UINT_MAX, this more efficient version can be used. */
681 /* Set: increment = util_fast_udiv_info::increment; */
682 LLVMValueRef ac_build_fast_udiv_nuw(struct ac_llvm_context *ctx,
683 LLVMValueRef num,
684 LLVMValueRef multiplier,
685 LLVMValueRef pre_shift,
686 LLVMValueRef post_shift,
687 LLVMValueRef increment)
688 {
689 LLVMBuilderRef builder = ctx->builder;
690
691 num = LLVMBuildLShr(builder, num, pre_shift, "");
692 num = LLVMBuildNUWAdd(builder, num, increment, "");
693 num = LLVMBuildMul(builder,
694 LLVMBuildZExt(builder, num, ctx->i64, ""),
695 LLVMBuildZExt(builder, multiplier, ctx->i64, ""), "");
696 num = LLVMBuildLShr(builder, num, LLVMConstInt(ctx->i64, 32, 0), "");
697 num = LLVMBuildTrunc(builder, num, ctx->i32, "");
698 return LLVMBuildLShr(builder, num, post_shift, "");
699 }
700
701 /* See fast_idiv_by_const.h. */
702 /* Both operands must fit in 31 bits and the divisor must not be 1. */
703 LLVMValueRef ac_build_fast_udiv_u31_d_not_one(struct ac_llvm_context *ctx,
704 LLVMValueRef num,
705 LLVMValueRef multiplier,
706 LLVMValueRef post_shift)
707 {
708 LLVMBuilderRef builder = ctx->builder;
709
710 num = LLVMBuildMul(builder,
711 LLVMBuildZExt(builder, num, ctx->i64, ""),
712 LLVMBuildZExt(builder, multiplier, ctx->i64, ""), "");
713 num = LLVMBuildLShr(builder, num, LLVMConstInt(ctx->i64, 32, 0), "");
714 num = LLVMBuildTrunc(builder, num, ctx->i32, "");
715 return LLVMBuildLShr(builder, num, post_shift, "");
716 }
717
718 /* Coordinates for cube map selection. sc, tc, and ma are as in Table 8.27
719 * of the OpenGL 4.5 (Compatibility Profile) specification, except ma is
720 * already multiplied by two. id is the cube face number.
721 */
722 struct cube_selection_coords {
723 LLVMValueRef stc[2];
724 LLVMValueRef ma;
725 LLVMValueRef id;
726 };
727
728 static void
729 build_cube_intrinsic(struct ac_llvm_context *ctx,
730 LLVMValueRef in[3],
731 struct cube_selection_coords *out)
732 {
733 LLVMTypeRef f32 = ctx->f32;
734
735 out->stc[1] = ac_build_intrinsic(ctx, "llvm.amdgcn.cubetc",
736 f32, in, 3, AC_FUNC_ATTR_READNONE);
737 out->stc[0] = ac_build_intrinsic(ctx, "llvm.amdgcn.cubesc",
738 f32, in, 3, AC_FUNC_ATTR_READNONE);
739 out->ma = ac_build_intrinsic(ctx, "llvm.amdgcn.cubema",
740 f32, in, 3, AC_FUNC_ATTR_READNONE);
741 out->id = ac_build_intrinsic(ctx, "llvm.amdgcn.cubeid",
742 f32, in, 3, AC_FUNC_ATTR_READNONE);
743 }
744
745 /**
746 * Build a manual selection sequence for cube face sc/tc coordinates and
747 * major axis vector (multiplied by 2 for consistency) for the given
748 * vec3 \p coords, for the face implied by \p selcoords.
749 *
750 * For the major axis, we always adjust the sign to be in the direction of
751 * selcoords.ma; i.e., a positive out_ma means that coords is pointed towards
752 * the selcoords major axis.
753 */
754 static void build_cube_select(struct ac_llvm_context *ctx,
755 const struct cube_selection_coords *selcoords,
756 const LLVMValueRef *coords,
757 LLVMValueRef *out_st,
758 LLVMValueRef *out_ma)
759 {
760 LLVMBuilderRef builder = ctx->builder;
761 LLVMTypeRef f32 = LLVMTypeOf(coords[0]);
762 LLVMValueRef is_ma_positive;
763 LLVMValueRef sgn_ma;
764 LLVMValueRef is_ma_z, is_not_ma_z;
765 LLVMValueRef is_ma_y;
766 LLVMValueRef is_ma_x;
767 LLVMValueRef sgn;
768 LLVMValueRef tmp;
769
770 is_ma_positive = LLVMBuildFCmp(builder, LLVMRealUGE,
771 selcoords->ma, LLVMConstReal(f32, 0.0), "");
772 sgn_ma = LLVMBuildSelect(builder, is_ma_positive,
773 LLVMConstReal(f32, 1.0), LLVMConstReal(f32, -1.0), "");
774
775 is_ma_z = LLVMBuildFCmp(builder, LLVMRealUGE, selcoords->id, LLVMConstReal(f32, 4.0), "");
776 is_not_ma_z = LLVMBuildNot(builder, is_ma_z, "");
777 is_ma_y = LLVMBuildAnd(builder, is_not_ma_z,
778 LLVMBuildFCmp(builder, LLVMRealUGE, selcoords->id, LLVMConstReal(f32, 2.0), ""), "");
779 is_ma_x = LLVMBuildAnd(builder, is_not_ma_z, LLVMBuildNot(builder, is_ma_y, ""), "");
780
781 /* Select sc */
782 tmp = LLVMBuildSelect(builder, is_ma_x, coords[2], coords[0], "");
783 sgn = LLVMBuildSelect(builder, is_ma_y, LLVMConstReal(f32, 1.0),
784 LLVMBuildSelect(builder, is_ma_z, sgn_ma,
785 LLVMBuildFNeg(builder, sgn_ma, ""), ""), "");
786 out_st[0] = LLVMBuildFMul(builder, tmp, sgn, "");
787
788 /* Select tc */
789 tmp = LLVMBuildSelect(builder, is_ma_y, coords[2], coords[1], "");
790 sgn = LLVMBuildSelect(builder, is_ma_y, sgn_ma,
791 LLVMConstReal(f32, -1.0), "");
792 out_st[1] = LLVMBuildFMul(builder, tmp, sgn, "");
793
794 /* Select ma */
795 tmp = LLVMBuildSelect(builder, is_ma_z, coords[2],
796 LLVMBuildSelect(builder, is_ma_y, coords[1], coords[0], ""), "");
797 tmp = ac_build_intrinsic(ctx, "llvm.fabs.f32",
798 ctx->f32, &tmp, 1, AC_FUNC_ATTR_READNONE);
799 *out_ma = LLVMBuildFMul(builder, tmp, LLVMConstReal(f32, 2.0), "");
800 }
801
802 void
803 ac_prepare_cube_coords(struct ac_llvm_context *ctx,
804 bool is_deriv, bool is_array, bool is_lod,
805 LLVMValueRef *coords_arg,
806 LLVMValueRef *derivs_arg)
807 {
808
809 LLVMBuilderRef builder = ctx->builder;
810 struct cube_selection_coords selcoords;
811 LLVMValueRef coords[3];
812 LLVMValueRef invma;
813
814 if (is_array && !is_lod) {
815 LLVMValueRef tmp = ac_build_round(ctx, coords_arg[3]);
816
817 /* Section 8.9 (Texture Functions) of the GLSL 4.50 spec says:
818 *
819 * "For Array forms, the array layer used will be
820 *
821 * max(0, min(d−1, floor(layer+0.5)))
822 *
823 * where d is the depth of the texture array and layer
824 * comes from the component indicated in the tables below.
825 * Workaroudn for an issue where the layer is taken from a
826 * helper invocation which happens to fall on a different
827 * layer due to extrapolation."
828 *
829 * GFX8 and earlier attempt to implement this in hardware by
830 * clamping the value of coords[2] = (8 * layer) + face.
831 * Unfortunately, this means that the we end up with the wrong
832 * face when clamping occurs.
833 *
834 * Clamp the layer earlier to work around the issue.
835 */
836 if (ctx->chip_class <= GFX8) {
837 LLVMValueRef ge0;
838 ge0 = LLVMBuildFCmp(builder, LLVMRealOGE, tmp, ctx->f32_0, "");
839 tmp = LLVMBuildSelect(builder, ge0, tmp, ctx->f32_0, "");
840 }
841
842 coords_arg[3] = tmp;
843 }
844
845 build_cube_intrinsic(ctx, coords_arg, &selcoords);
846
847 invma = ac_build_intrinsic(ctx, "llvm.fabs.f32",
848 ctx->f32, &selcoords.ma, 1, AC_FUNC_ATTR_READNONE);
849 invma = ac_build_fdiv(ctx, LLVMConstReal(ctx->f32, 1.0), invma);
850
851 for (int i = 0; i < 2; ++i)
852 coords[i] = LLVMBuildFMul(builder, selcoords.stc[i], invma, "");
853
854 coords[2] = selcoords.id;
855
856 if (is_deriv && derivs_arg) {
857 LLVMValueRef derivs[4];
858 int axis;
859
860 /* Convert cube derivatives to 2D derivatives. */
861 for (axis = 0; axis < 2; axis++) {
862 LLVMValueRef deriv_st[2];
863 LLVMValueRef deriv_ma;
864
865 /* Transform the derivative alongside the texture
866 * coordinate. Mathematically, the correct formula is
867 * as follows. Assume we're projecting onto the +Z face
868 * and denote by dx/dh the derivative of the (original)
869 * X texture coordinate with respect to horizontal
870 * window coordinates. The projection onto the +Z face
871 * plane is:
872 *
873 * f(x,z) = x/z
874 *
875 * Then df/dh = df/dx * dx/dh + df/dz * dz/dh
876 * = 1/z * dx/dh - x/z * 1/z * dz/dh.
877 *
878 * This motivatives the implementation below.
879 *
880 * Whether this actually gives the expected results for
881 * apps that might feed in derivatives obtained via
882 * finite differences is anyone's guess. The OpenGL spec
883 * seems awfully quiet about how textureGrad for cube
884 * maps should be handled.
885 */
886 build_cube_select(ctx, &selcoords, &derivs_arg[axis * 3],
887 deriv_st, &deriv_ma);
888
889 deriv_ma = LLVMBuildFMul(builder, deriv_ma, invma, "");
890
891 for (int i = 0; i < 2; ++i)
892 derivs[axis * 2 + i] =
893 LLVMBuildFSub(builder,
894 LLVMBuildFMul(builder, deriv_st[i], invma, ""),
895 LLVMBuildFMul(builder, deriv_ma, coords[i], ""), "");
896 }
897
898 memcpy(derivs_arg, derivs, sizeof(derivs));
899 }
900
901 /* Shift the texture coordinate. This must be applied after the
902 * derivative calculation.
903 */
904 for (int i = 0; i < 2; ++i)
905 coords[i] = LLVMBuildFAdd(builder, coords[i], LLVMConstReal(ctx->f32, 1.5), "");
906
907 if (is_array) {
908 /* for cube arrays coord.z = coord.w(array_index) * 8 + face */
909 /* coords_arg.w component - array_index for cube arrays */
910 coords[2] = ac_build_fmad(ctx, coords_arg[3], LLVMConstReal(ctx->f32, 8.0), coords[2]);
911 }
912
913 memcpy(coords_arg, coords, sizeof(coords));
914 }
915
916
917 LLVMValueRef
918 ac_build_fs_interp(struct ac_llvm_context *ctx,
919 LLVMValueRef llvm_chan,
920 LLVMValueRef attr_number,
921 LLVMValueRef params,
922 LLVMValueRef i,
923 LLVMValueRef j)
924 {
925 LLVMValueRef args[5];
926 LLVMValueRef p1;
927
928 args[0] = i;
929 args[1] = llvm_chan;
930 args[2] = attr_number;
931 args[3] = params;
932
933 p1 = ac_build_intrinsic(ctx, "llvm.amdgcn.interp.p1",
934 ctx->f32, args, 4, AC_FUNC_ATTR_READNONE);
935
936 args[0] = p1;
937 args[1] = j;
938 args[2] = llvm_chan;
939 args[3] = attr_number;
940 args[4] = params;
941
942 return ac_build_intrinsic(ctx, "llvm.amdgcn.interp.p2",
943 ctx->f32, args, 5, AC_FUNC_ATTR_READNONE);
944 }
945
946 LLVMValueRef
947 ac_build_fs_interp_f16(struct ac_llvm_context *ctx,
948 LLVMValueRef llvm_chan,
949 LLVMValueRef attr_number,
950 LLVMValueRef params,
951 LLVMValueRef i,
952 LLVMValueRef j)
953 {
954 LLVMValueRef args[6];
955 LLVMValueRef p1;
956
957 args[0] = i;
958 args[1] = llvm_chan;
959 args[2] = attr_number;
960 args[3] = ctx->i1false;
961 args[4] = params;
962
963 p1 = ac_build_intrinsic(ctx, "llvm.amdgcn.interp.p1.f16",
964 ctx->f32, args, 5, AC_FUNC_ATTR_READNONE);
965
966 args[0] = p1;
967 args[1] = j;
968 args[2] = llvm_chan;
969 args[3] = attr_number;
970 args[4] = ctx->i1false;
971 args[5] = params;
972
973 return ac_build_intrinsic(ctx, "llvm.amdgcn.interp.p2.f16",
974 ctx->f16, args, 6, AC_FUNC_ATTR_READNONE);
975 }
976
977 LLVMValueRef
978 ac_build_fs_interp_mov(struct ac_llvm_context *ctx,
979 LLVMValueRef parameter,
980 LLVMValueRef llvm_chan,
981 LLVMValueRef attr_number,
982 LLVMValueRef params)
983 {
984 LLVMValueRef args[4];
985
986 args[0] = parameter;
987 args[1] = llvm_chan;
988 args[2] = attr_number;
989 args[3] = params;
990
991 return ac_build_intrinsic(ctx, "llvm.amdgcn.interp.mov",
992 ctx->f32, args, 4, AC_FUNC_ATTR_READNONE);
993 }
994
995 LLVMValueRef
996 ac_build_gep_ptr(struct ac_llvm_context *ctx,
997 LLVMValueRef base_ptr,
998 LLVMValueRef index)
999 {
1000 return LLVMBuildGEP(ctx->builder, base_ptr, &index, 1, "");
1001 }
1002
1003 LLVMValueRef
1004 ac_build_gep0(struct ac_llvm_context *ctx,
1005 LLVMValueRef base_ptr,
1006 LLVMValueRef index)
1007 {
1008 LLVMValueRef indices[2] = {
1009 ctx->i32_0,
1010 index,
1011 };
1012 return LLVMBuildGEP(ctx->builder, base_ptr, indices, 2, "");
1013 }
1014
1015 LLVMValueRef ac_build_pointer_add(struct ac_llvm_context *ctx, LLVMValueRef ptr,
1016 LLVMValueRef index)
1017 {
1018 return LLVMBuildPointerCast(ctx->builder,
1019 LLVMBuildGEP(ctx->builder, ptr, &index, 1, ""),
1020 LLVMTypeOf(ptr), "");
1021 }
1022
1023 void
1024 ac_build_indexed_store(struct ac_llvm_context *ctx,
1025 LLVMValueRef base_ptr, LLVMValueRef index,
1026 LLVMValueRef value)
1027 {
1028 LLVMBuildStore(ctx->builder, value,
1029 ac_build_gep0(ctx, base_ptr, index));
1030 }
1031
1032 /**
1033 * Build an LLVM bytecode indexed load using LLVMBuildGEP + LLVMBuildLoad.
1034 * It's equivalent to doing a load from &base_ptr[index].
1035 *
1036 * \param base_ptr Where the array starts.
1037 * \param index The element index into the array.
1038 * \param uniform Whether the base_ptr and index can be assumed to be
1039 * dynamically uniform (i.e. load to an SGPR)
1040 * \param invariant Whether the load is invariant (no other opcodes affect it)
1041 * \param no_unsigned_wraparound
1042 * For all possible re-associations and re-distributions of an expression
1043 * "base_ptr + index * elemsize" into "addr + offset" (excluding GEPs
1044 * without inbounds in base_ptr), this parameter is true if "addr + offset"
1045 * does not result in an unsigned integer wraparound. This is used for
1046 * optimal code generation of 32-bit pointer arithmetic.
1047 *
1048 * For example, a 32-bit immediate offset that causes a 32-bit unsigned
1049 * integer wraparound can't be an imm offset in s_load_dword, because
1050 * the instruction performs "addr + offset" in 64 bits.
1051 *
1052 * Expected usage for bindless textures by chaining GEPs:
1053 * // possible unsigned wraparound, don't use InBounds:
1054 * ptr1 = LLVMBuildGEP(base_ptr, index);
1055 * image = load(ptr1); // becomes "s_load ptr1, 0"
1056 *
1057 * ptr2 = LLVMBuildInBoundsGEP(ptr1, 32 / elemsize);
1058 * sampler = load(ptr2); // becomes "s_load ptr1, 32" thanks to InBounds
1059 */
1060 static LLVMValueRef
1061 ac_build_load_custom(struct ac_llvm_context *ctx, LLVMValueRef base_ptr,
1062 LLVMValueRef index, bool uniform, bool invariant,
1063 bool no_unsigned_wraparound)
1064 {
1065 LLVMValueRef pointer, result;
1066
1067 if (no_unsigned_wraparound &&
1068 LLVMGetPointerAddressSpace(LLVMTypeOf(base_ptr)) == AC_ADDR_SPACE_CONST_32BIT)
1069 pointer = LLVMBuildInBoundsGEP(ctx->builder, base_ptr, &index, 1, "");
1070 else
1071 pointer = LLVMBuildGEP(ctx->builder, base_ptr, &index, 1, "");
1072
1073 if (uniform)
1074 LLVMSetMetadata(pointer, ctx->uniform_md_kind, ctx->empty_md);
1075 result = LLVMBuildLoad(ctx->builder, pointer, "");
1076 if (invariant)
1077 LLVMSetMetadata(result, ctx->invariant_load_md_kind, ctx->empty_md);
1078 return result;
1079 }
1080
1081 LLVMValueRef ac_build_load(struct ac_llvm_context *ctx, LLVMValueRef base_ptr,
1082 LLVMValueRef index)
1083 {
1084 return ac_build_load_custom(ctx, base_ptr, index, false, false, false);
1085 }
1086
1087 LLVMValueRef ac_build_load_invariant(struct ac_llvm_context *ctx,
1088 LLVMValueRef base_ptr, LLVMValueRef index)
1089 {
1090 return ac_build_load_custom(ctx, base_ptr, index, false, true, false);
1091 }
1092
1093 /* This assumes that there is no unsigned integer wraparound during the address
1094 * computation, excluding all GEPs within base_ptr. */
1095 LLVMValueRef ac_build_load_to_sgpr(struct ac_llvm_context *ctx,
1096 LLVMValueRef base_ptr, LLVMValueRef index)
1097 {
1098 return ac_build_load_custom(ctx, base_ptr, index, true, true, true);
1099 }
1100
1101 /* See ac_build_load_custom() documentation. */
1102 LLVMValueRef ac_build_load_to_sgpr_uint_wraparound(struct ac_llvm_context *ctx,
1103 LLVMValueRef base_ptr, LLVMValueRef index)
1104 {
1105 return ac_build_load_custom(ctx, base_ptr, index, true, true, false);
1106 }
1107
1108 static void
1109 ac_build_buffer_store_common(struct ac_llvm_context *ctx,
1110 LLVMValueRef rsrc,
1111 LLVMValueRef data,
1112 LLVMValueRef vindex,
1113 LLVMValueRef voffset,
1114 unsigned num_channels,
1115 bool glc,
1116 bool slc,
1117 bool writeonly_memory,
1118 bool use_format)
1119 {
1120 LLVMValueRef args[] = {
1121 data,
1122 LLVMBuildBitCast(ctx->builder, rsrc, ctx->v4i32, ""),
1123 vindex ? vindex : ctx->i32_0,
1124 voffset,
1125 LLVMConstInt(ctx->i1, glc, 0),
1126 LLVMConstInt(ctx->i1, slc, 0)
1127 };
1128 unsigned func = CLAMP(num_channels, 1, 3) - 1;
1129
1130 const char *type_names[] = {"f32", "v2f32", "v4f32"};
1131 char name[256];
1132
1133 if (use_format) {
1134 snprintf(name, sizeof(name), "llvm.amdgcn.buffer.store.format.%s",
1135 type_names[func]);
1136 } else {
1137 snprintf(name, sizeof(name), "llvm.amdgcn.buffer.store.%s",
1138 type_names[func]);
1139 }
1140
1141 ac_build_intrinsic(ctx, name, ctx->voidt, args, ARRAY_SIZE(args),
1142 ac_get_store_intr_attribs(writeonly_memory));
1143 }
1144
1145 static void
1146 ac_build_llvm8_buffer_store_common(struct ac_llvm_context *ctx,
1147 LLVMValueRef rsrc,
1148 LLVMValueRef data,
1149 LLVMValueRef vindex,
1150 LLVMValueRef voffset,
1151 LLVMValueRef soffset,
1152 unsigned num_channels,
1153 LLVMTypeRef return_channel_type,
1154 bool glc,
1155 bool slc,
1156 bool writeonly_memory,
1157 bool use_format,
1158 bool structurized)
1159 {
1160 LLVMValueRef args[6];
1161 int idx = 0;
1162 args[idx++] = data;
1163 args[idx++] = LLVMBuildBitCast(ctx->builder, rsrc, ctx->v4i32, "");
1164 if (structurized)
1165 args[idx++] = vindex ? vindex : ctx->i32_0;
1166 args[idx++] = voffset ? voffset : ctx->i32_0;
1167 args[idx++] = soffset ? soffset : ctx->i32_0;
1168 args[idx++] = LLVMConstInt(ctx->i32, (glc ? 1 : 0) + (slc ? 2 : 0), 0);
1169 unsigned func = num_channels == 3 ? 4 : num_channels;
1170 const char *indexing_kind = structurized ? "struct" : "raw";
1171 char name[256], type_name[8];
1172
1173 LLVMTypeRef type = func > 1 ? LLVMVectorType(return_channel_type, func) : return_channel_type;
1174 ac_build_type_name_for_intr(type, type_name, sizeof(type_name));
1175
1176 if (use_format) {
1177 snprintf(name, sizeof(name), "llvm.amdgcn.%s.buffer.store.format.%s",
1178 indexing_kind, type_name);
1179 } else {
1180 snprintf(name, sizeof(name), "llvm.amdgcn.%s.buffer.store.%s",
1181 indexing_kind, type_name);
1182 }
1183
1184 ac_build_intrinsic(ctx, name, ctx->voidt, args, idx,
1185 ac_get_store_intr_attribs(writeonly_memory));
1186 }
1187
1188 void
1189 ac_build_buffer_store_format(struct ac_llvm_context *ctx,
1190 LLVMValueRef rsrc,
1191 LLVMValueRef data,
1192 LLVMValueRef vindex,
1193 LLVMValueRef voffset,
1194 unsigned num_channels,
1195 bool glc,
1196 bool writeonly_memory)
1197 {
1198 if (HAVE_LLVM >= 0x800) {
1199 ac_build_llvm8_buffer_store_common(ctx, rsrc, data, vindex,
1200 voffset, NULL, num_channels,
1201 ctx->f32, glc, false,
1202 writeonly_memory, true, true);
1203 } else {
1204 ac_build_buffer_store_common(ctx, rsrc, data, vindex, voffset,
1205 num_channels, glc, false,
1206 writeonly_memory, true);
1207 }
1208 }
1209
1210 /* TBUFFER_STORE_FORMAT_{X,XY,XYZ,XYZW} <- the suffix is selected by num_channels=1..4.
1211 * The type of vdata must be one of i32 (num_channels=1), v2i32 (num_channels=2),
1212 * or v4i32 (num_channels=3,4).
1213 */
1214 void
1215 ac_build_buffer_store_dword(struct ac_llvm_context *ctx,
1216 LLVMValueRef rsrc,
1217 LLVMValueRef vdata,
1218 unsigned num_channels,
1219 LLVMValueRef voffset,
1220 LLVMValueRef soffset,
1221 unsigned inst_offset,
1222 bool glc,
1223 bool slc,
1224 bool writeonly_memory,
1225 bool swizzle_enable_hint)
1226 {
1227 /* Split 3 channel stores, becase LLVM doesn't support 3-channel
1228 * intrinsics. */
1229 if (num_channels == 3) {
1230 LLVMValueRef v[3], v01;
1231
1232 for (int i = 0; i < 3; i++) {
1233 v[i] = LLVMBuildExtractElement(ctx->builder, vdata,
1234 LLVMConstInt(ctx->i32, i, 0), "");
1235 }
1236 v01 = ac_build_gather_values(ctx, v, 2);
1237
1238 ac_build_buffer_store_dword(ctx, rsrc, v01, 2, voffset,
1239 soffset, inst_offset, glc, slc,
1240 writeonly_memory, swizzle_enable_hint);
1241 ac_build_buffer_store_dword(ctx, rsrc, v[2], 1, voffset,
1242 soffset, inst_offset + 8,
1243 glc, slc,
1244 writeonly_memory, swizzle_enable_hint);
1245 return;
1246 }
1247
1248 /* SWIZZLE_ENABLE requires that soffset isn't folded into voffset
1249 * (voffset is swizzled, but soffset isn't swizzled).
1250 * llvm.amdgcn.buffer.store doesn't have a separate soffset parameter.
1251 */
1252 if (!swizzle_enable_hint) {
1253 LLVMValueRef offset = soffset;
1254
1255 if (inst_offset)
1256 offset = LLVMBuildAdd(ctx->builder, offset,
1257 LLVMConstInt(ctx->i32, inst_offset, 0), "");
1258
1259 if (HAVE_LLVM >= 0x800) {
1260 ac_build_llvm8_buffer_store_common(ctx, rsrc,
1261 ac_to_float(ctx, vdata),
1262 ctx->i32_0,
1263 voffset, offset,
1264 num_channels,
1265 ctx->f32,
1266 glc, slc,
1267 writeonly_memory,
1268 false, false);
1269 } else {
1270 if (voffset)
1271 offset = LLVMBuildAdd(ctx->builder, offset, voffset, "");
1272
1273 ac_build_buffer_store_common(ctx, rsrc,
1274 ac_to_float(ctx, vdata),
1275 ctx->i32_0, offset,
1276 num_channels, glc, slc,
1277 writeonly_memory, false);
1278 }
1279 return;
1280 }
1281
1282 static const unsigned dfmts[] = {
1283 V_008F0C_BUF_DATA_FORMAT_32,
1284 V_008F0C_BUF_DATA_FORMAT_32_32,
1285 V_008F0C_BUF_DATA_FORMAT_32_32_32,
1286 V_008F0C_BUF_DATA_FORMAT_32_32_32_32
1287 };
1288 unsigned dfmt = dfmts[num_channels - 1];
1289 unsigned nfmt = V_008F0C_BUF_NUM_FORMAT_UINT;
1290 LLVMValueRef immoffset = LLVMConstInt(ctx->i32, inst_offset, 0);
1291
1292 ac_build_raw_tbuffer_store(ctx, rsrc, vdata, voffset, soffset,
1293 immoffset, num_channels, dfmt, nfmt, glc,
1294 slc, writeonly_memory);
1295 }
1296
1297 static LLVMValueRef
1298 ac_build_buffer_load_common(struct ac_llvm_context *ctx,
1299 LLVMValueRef rsrc,
1300 LLVMValueRef vindex,
1301 LLVMValueRef voffset,
1302 unsigned num_channels,
1303 bool glc,
1304 bool slc,
1305 bool can_speculate,
1306 bool use_format)
1307 {
1308 LLVMValueRef args[] = {
1309 LLVMBuildBitCast(ctx->builder, rsrc, ctx->v4i32, ""),
1310 vindex ? vindex : ctx->i32_0,
1311 voffset,
1312 LLVMConstInt(ctx->i1, glc, 0),
1313 LLVMConstInt(ctx->i1, slc, 0)
1314 };
1315 unsigned func = CLAMP(num_channels, 1, 3) - 1;
1316
1317 LLVMTypeRef types[] = {ctx->f32, ctx->v2f32, ctx->v4f32};
1318 const char *type_names[] = {"f32", "v2f32", "v4f32"};
1319 char name[256];
1320
1321 if (use_format) {
1322 snprintf(name, sizeof(name), "llvm.amdgcn.buffer.load.format.%s",
1323 type_names[func]);
1324 } else {
1325 snprintf(name, sizeof(name), "llvm.amdgcn.buffer.load.%s",
1326 type_names[func]);
1327 }
1328
1329 return ac_build_intrinsic(ctx, name, types[func], args,
1330 ARRAY_SIZE(args),
1331 ac_get_load_intr_attribs(can_speculate));
1332 }
1333
1334 static LLVMValueRef
1335 ac_build_llvm8_buffer_load_common(struct ac_llvm_context *ctx,
1336 LLVMValueRef rsrc,
1337 LLVMValueRef vindex,
1338 LLVMValueRef voffset,
1339 LLVMValueRef soffset,
1340 unsigned num_channels,
1341 LLVMTypeRef channel_type,
1342 bool glc,
1343 bool slc,
1344 bool can_speculate,
1345 bool use_format,
1346 bool structurized)
1347 {
1348 LLVMValueRef args[5];
1349 int idx = 0;
1350 args[idx++] = LLVMBuildBitCast(ctx->builder, rsrc, ctx->v4i32, "");
1351 if (structurized)
1352 args[idx++] = vindex ? vindex : ctx->i32_0;
1353 args[idx++] = voffset ? voffset : ctx->i32_0;
1354 args[idx++] = soffset ? soffset : ctx->i32_0;
1355 args[idx++] = LLVMConstInt(ctx->i32, (glc ? 1 : 0) + (slc ? 2 : 0), 0);
1356 unsigned func = num_channels == 3 ? 4 : num_channels;
1357 const char *indexing_kind = structurized ? "struct" : "raw";
1358 char name[256], type_name[8];
1359
1360 LLVMTypeRef type = func > 1 ? LLVMVectorType(channel_type, func) : channel_type;
1361 ac_build_type_name_for_intr(type, type_name, sizeof(type_name));
1362
1363 if (use_format) {
1364 snprintf(name, sizeof(name), "llvm.amdgcn.%s.buffer.load.format.%s",
1365 indexing_kind, type_name);
1366 } else {
1367 snprintf(name, sizeof(name), "llvm.amdgcn.%s.buffer.load.%s",
1368 indexing_kind, type_name);
1369 }
1370
1371 return ac_build_intrinsic(ctx, name, type, args, idx,
1372 ac_get_load_intr_attribs(can_speculate));
1373 }
1374
1375 LLVMValueRef
1376 ac_build_buffer_load(struct ac_llvm_context *ctx,
1377 LLVMValueRef rsrc,
1378 int num_channels,
1379 LLVMValueRef vindex,
1380 LLVMValueRef voffset,
1381 LLVMValueRef soffset,
1382 unsigned inst_offset,
1383 unsigned glc,
1384 unsigned slc,
1385 bool can_speculate,
1386 bool allow_smem)
1387 {
1388 LLVMValueRef offset = LLVMConstInt(ctx->i32, inst_offset, 0);
1389 if (voffset)
1390 offset = LLVMBuildAdd(ctx->builder, offset, voffset, "");
1391 if (soffset)
1392 offset = LLVMBuildAdd(ctx->builder, offset, soffset, "");
1393
1394 if (allow_smem && !slc &&
1395 (!glc || (HAVE_LLVM >= 0x0800 && ctx->chip_class >= GFX8))) {
1396 assert(vindex == NULL);
1397
1398 LLVMValueRef result[8];
1399
1400 for (int i = 0; i < num_channels; i++) {
1401 if (i) {
1402 offset = LLVMBuildAdd(ctx->builder, offset,
1403 LLVMConstInt(ctx->i32, 4, 0), "");
1404 }
1405 const char *intrname =
1406 HAVE_LLVM >= 0x0800 ? "llvm.amdgcn.s.buffer.load.f32"
1407 : "llvm.SI.load.const.v4i32";
1408 unsigned num_args = HAVE_LLVM >= 0x0800 ? 3 : 2;
1409 LLVMValueRef args[3] = {
1410 rsrc,
1411 offset,
1412 glc ? ctx->i32_1 : ctx->i32_0,
1413 };
1414 result[i] = ac_build_intrinsic(ctx, intrname,
1415 ctx->f32, args, num_args,
1416 AC_FUNC_ATTR_READNONE |
1417 (HAVE_LLVM < 0x0800 ? AC_FUNC_ATTR_LEGACY : 0));
1418 }
1419 if (num_channels == 1)
1420 return result[0];
1421
1422 if (num_channels == 3)
1423 result[num_channels++] = LLVMGetUndef(ctx->f32);
1424 return ac_build_gather_values(ctx, result, num_channels);
1425 }
1426
1427 if (HAVE_LLVM >= 0x0800) {
1428 return ac_build_llvm8_buffer_load_common(ctx, rsrc, vindex,
1429 offset, ctx->i32_0,
1430 num_channels, ctx->f32,
1431 glc, slc,
1432 can_speculate, false,
1433 false);
1434 }
1435
1436 return ac_build_buffer_load_common(ctx, rsrc, vindex, offset,
1437 num_channels, glc, slc,
1438 can_speculate, false);
1439 }
1440
1441 LLVMValueRef ac_build_buffer_load_format(struct ac_llvm_context *ctx,
1442 LLVMValueRef rsrc,
1443 LLVMValueRef vindex,
1444 LLVMValueRef voffset,
1445 unsigned num_channels,
1446 bool glc,
1447 bool can_speculate)
1448 {
1449 if (HAVE_LLVM >= 0x800) {
1450 return ac_build_llvm8_buffer_load_common(ctx, rsrc, vindex, voffset, ctx->i32_0,
1451 num_channels, ctx->f32,
1452 glc, false,
1453 can_speculate, true, true);
1454 }
1455 return ac_build_buffer_load_common(ctx, rsrc, vindex, voffset,
1456 num_channels, glc, false,
1457 can_speculate, true);
1458 }
1459
1460 LLVMValueRef ac_build_buffer_load_format_gfx9_safe(struct ac_llvm_context *ctx,
1461 LLVMValueRef rsrc,
1462 LLVMValueRef vindex,
1463 LLVMValueRef voffset,
1464 unsigned num_channels,
1465 bool glc,
1466 bool can_speculate)
1467 {
1468 if (HAVE_LLVM >= 0x800) {
1469 return ac_build_llvm8_buffer_load_common(ctx, rsrc, vindex, voffset, ctx->i32_0,
1470 num_channels, ctx->f32,
1471 glc, false,
1472 can_speculate, true, true);
1473 }
1474
1475 LLVMValueRef elem_count = LLVMBuildExtractElement(ctx->builder, rsrc, LLVMConstInt(ctx->i32, 2, 0), "");
1476 LLVMValueRef stride = LLVMBuildExtractElement(ctx->builder, rsrc, ctx->i32_1, "");
1477 stride = LLVMBuildLShr(ctx->builder, stride, LLVMConstInt(ctx->i32, 16, 0), "");
1478
1479 LLVMValueRef new_elem_count = LLVMBuildSelect(ctx->builder,
1480 LLVMBuildICmp(ctx->builder, LLVMIntUGT, elem_count, stride, ""),
1481 elem_count, stride, "");
1482
1483 LLVMValueRef new_rsrc = LLVMBuildInsertElement(ctx->builder, rsrc, new_elem_count,
1484 LLVMConstInt(ctx->i32, 2, 0), "");
1485
1486 return ac_build_buffer_load_common(ctx, new_rsrc, vindex, voffset,
1487 num_channels, glc, false,
1488 can_speculate, true);
1489 }
1490
1491 static LLVMValueRef
1492 ac_build_llvm8_tbuffer_load(struct ac_llvm_context *ctx,
1493 LLVMValueRef rsrc,
1494 LLVMValueRef vindex,
1495 LLVMValueRef voffset,
1496 LLVMValueRef soffset,
1497 unsigned num_channels,
1498 unsigned dfmt,
1499 unsigned nfmt,
1500 bool glc,
1501 bool slc,
1502 bool can_speculate,
1503 bool structurized)
1504 {
1505 LLVMValueRef args[6];
1506 int idx = 0;
1507 args[idx++] = LLVMBuildBitCast(ctx->builder, rsrc, ctx->v4i32, "");
1508 if (structurized)
1509 args[idx++] = vindex ? vindex : ctx->i32_0;
1510 args[idx++] = voffset ? voffset : ctx->i32_0;
1511 args[idx++] = soffset ? soffset : ctx->i32_0;
1512 args[idx++] = LLVMConstInt(ctx->i32, dfmt | (nfmt << 4), 0);
1513 args[idx++] = LLVMConstInt(ctx->i32, (glc ? 1 : 0) + (slc ? 2 : 0), 0);
1514 unsigned func = num_channels == 3 ? 4 : num_channels;
1515 const char *indexing_kind = structurized ? "struct" : "raw";
1516 char name[256], type_name[8];
1517
1518 LLVMTypeRef type = func > 1 ? LLVMVectorType(ctx->i32, func) : ctx->i32;
1519 ac_build_type_name_for_intr(type, type_name, sizeof(type_name));
1520
1521 snprintf(name, sizeof(name), "llvm.amdgcn.%s.tbuffer.load.%s",
1522 indexing_kind, type_name);
1523
1524 return ac_build_intrinsic(ctx, name, type, args, idx,
1525 ac_get_load_intr_attribs(can_speculate));
1526 }
1527
1528 static LLVMValueRef
1529 ac_build_tbuffer_load(struct ac_llvm_context *ctx,
1530 LLVMValueRef rsrc,
1531 LLVMValueRef vindex,
1532 LLVMValueRef voffset,
1533 LLVMValueRef soffset,
1534 LLVMValueRef immoffset,
1535 unsigned num_channels,
1536 unsigned dfmt,
1537 unsigned nfmt,
1538 bool glc,
1539 bool slc,
1540 bool can_speculate,
1541 bool structurized) /* only matters for LLVM 8+ */
1542 {
1543 if (HAVE_LLVM >= 0x800) {
1544 voffset = LLVMBuildAdd(ctx->builder, voffset, immoffset, "");
1545
1546 return ac_build_llvm8_tbuffer_load(ctx, rsrc, vindex, voffset,
1547 soffset, num_channels,
1548 dfmt, nfmt, glc, slc,
1549 can_speculate, structurized);
1550 }
1551
1552 LLVMValueRef args[] = {
1553 rsrc,
1554 vindex ? vindex : ctx->i32_0,
1555 voffset,
1556 soffset,
1557 immoffset,
1558 LLVMConstInt(ctx->i32, dfmt, false),
1559 LLVMConstInt(ctx->i32, nfmt, false),
1560 LLVMConstInt(ctx->i1, glc, false),
1561 LLVMConstInt(ctx->i1, slc, false),
1562 };
1563 unsigned func = CLAMP(num_channels, 1, 3) - 1;
1564 LLVMTypeRef types[] = {ctx->i32, ctx->v2i32, ctx->v4i32};
1565 const char *type_names[] = {"i32", "v2i32", "v4i32"};
1566 char name[256];
1567
1568 snprintf(name, sizeof(name), "llvm.amdgcn.tbuffer.load.%s",
1569 type_names[func]);
1570
1571 return ac_build_intrinsic(ctx, name, types[func], args, 9,
1572 ac_get_load_intr_attribs(can_speculate));
1573 }
1574
1575 LLVMValueRef
1576 ac_build_struct_tbuffer_load(struct ac_llvm_context *ctx,
1577 LLVMValueRef rsrc,
1578 LLVMValueRef vindex,
1579 LLVMValueRef voffset,
1580 LLVMValueRef soffset,
1581 LLVMValueRef immoffset,
1582 unsigned num_channels,
1583 unsigned dfmt,
1584 unsigned nfmt,
1585 bool glc,
1586 bool slc,
1587 bool can_speculate)
1588 {
1589 return ac_build_tbuffer_load(ctx, rsrc, vindex, voffset, soffset,
1590 immoffset, num_channels, dfmt, nfmt, glc,
1591 slc, can_speculate, true);
1592 }
1593
1594 LLVMValueRef
1595 ac_build_raw_tbuffer_load(struct ac_llvm_context *ctx,
1596 LLVMValueRef rsrc,
1597 LLVMValueRef voffset,
1598 LLVMValueRef soffset,
1599 LLVMValueRef immoffset,
1600 unsigned num_channels,
1601 unsigned dfmt,
1602 unsigned nfmt,
1603 bool glc,
1604 bool slc,
1605 bool can_speculate)
1606 {
1607 return ac_build_tbuffer_load(ctx, rsrc, NULL, voffset, soffset,
1608 immoffset, num_channels, dfmt, nfmt, glc,
1609 slc, can_speculate, false);
1610 }
1611
1612 LLVMValueRef
1613 ac_build_tbuffer_load_short(struct ac_llvm_context *ctx,
1614 LLVMValueRef rsrc,
1615 LLVMValueRef voffset,
1616 LLVMValueRef soffset,
1617 LLVMValueRef immoffset,
1618 bool glc)
1619 {
1620 LLVMValueRef res;
1621
1622 if (HAVE_LLVM >= 0x900) {
1623 voffset = LLVMBuildAdd(ctx->builder, voffset, immoffset, "");
1624
1625 /* LLVM 9+ supports i8/i16 with struct/raw intrinsics. */
1626 res = ac_build_llvm8_buffer_load_common(ctx, rsrc, NULL,
1627 voffset, soffset,
1628 1, ctx->i16, glc, false,
1629 false, false, false);
1630 } else {
1631 unsigned dfmt = V_008F0C_BUF_DATA_FORMAT_16;
1632 unsigned nfmt = V_008F0C_BUF_NUM_FORMAT_UINT;
1633
1634 res = ac_build_raw_tbuffer_load(ctx, rsrc, voffset, soffset,
1635 immoffset, 1, dfmt, nfmt, glc, false,
1636 false);
1637
1638 res = LLVMBuildTrunc(ctx->builder, res, ctx->i16, "");
1639 }
1640
1641 return res;
1642 }
1643
1644 LLVMValueRef
1645 ac_build_tbuffer_load_byte(struct ac_llvm_context *ctx,
1646 LLVMValueRef rsrc,
1647 LLVMValueRef voffset,
1648 LLVMValueRef soffset,
1649 LLVMValueRef immoffset,
1650 bool glc)
1651 {
1652 LLVMValueRef res;
1653
1654 if (HAVE_LLVM >= 0x900) {
1655 voffset = LLVMBuildAdd(ctx->builder, voffset, immoffset, "");
1656
1657 /* LLVM 9+ supports i8/i16 with struct/raw intrinsics. */
1658 res = ac_build_llvm8_buffer_load_common(ctx, rsrc, NULL,
1659 voffset, soffset,
1660 1, ctx->i8, glc, false,
1661 false, false, false);
1662 } else {
1663 unsigned dfmt = V_008F0C_BUF_DATA_FORMAT_8;
1664 unsigned nfmt = V_008F0C_BUF_NUM_FORMAT_UINT;
1665
1666 res = ac_build_raw_tbuffer_load(ctx, rsrc, voffset, soffset,
1667 immoffset, 1, dfmt, nfmt, glc, false,
1668 false);
1669
1670 res = LLVMBuildTrunc(ctx->builder, res, ctx->i8, "");
1671 }
1672
1673 return res;
1674 }
1675
1676 /**
1677 * Convert an 11- or 10-bit unsigned floating point number to an f32.
1678 *
1679 * The input exponent is expected to be biased analogous to IEEE-754, i.e. by
1680 * 2^(exp_bits-1) - 1 (as defined in OpenGL and other graphics APIs).
1681 */
1682 static LLVMValueRef
1683 ac_ufN_to_float(struct ac_llvm_context *ctx, LLVMValueRef src, unsigned exp_bits, unsigned mant_bits)
1684 {
1685 assert(LLVMTypeOf(src) == ctx->i32);
1686
1687 LLVMValueRef tmp;
1688 LLVMValueRef mantissa;
1689 mantissa = LLVMBuildAnd(ctx->builder, src, LLVMConstInt(ctx->i32, (1 << mant_bits) - 1, false), "");
1690
1691 /* Converting normal numbers is just a shift + correcting the exponent bias */
1692 unsigned normal_shift = 23 - mant_bits;
1693 unsigned bias_shift = 127 - ((1 << (exp_bits - 1)) - 1);
1694 LLVMValueRef shifted, normal;
1695
1696 shifted = LLVMBuildShl(ctx->builder, src, LLVMConstInt(ctx->i32, normal_shift, false), "");
1697 normal = LLVMBuildAdd(ctx->builder, shifted, LLVMConstInt(ctx->i32, bias_shift << 23, false), "");
1698
1699 /* Converting nan/inf numbers is the same, but with a different exponent update */
1700 LLVMValueRef naninf;
1701 naninf = LLVMBuildOr(ctx->builder, normal, LLVMConstInt(ctx->i32, 0xff << 23, false), "");
1702
1703 /* Converting denormals is the complex case: determine the leading zeros of the
1704 * mantissa to obtain the correct shift for the mantissa and exponent correction.
1705 */
1706 LLVMValueRef denormal;
1707 LLVMValueRef params[2] = {
1708 mantissa,
1709 ctx->i1true, /* result can be undef when arg is 0 */
1710 };
1711 LLVMValueRef ctlz = ac_build_intrinsic(ctx, "llvm.ctlz.i32", ctx->i32,
1712 params, 2, AC_FUNC_ATTR_READNONE);
1713
1714 /* Shift such that the leading 1 ends up as the LSB of the exponent field. */
1715 tmp = LLVMBuildSub(ctx->builder, ctlz, LLVMConstInt(ctx->i32, 8, false), "");
1716 denormal = LLVMBuildShl(ctx->builder, mantissa, tmp, "");
1717
1718 unsigned denormal_exp = bias_shift + (32 - mant_bits) - 1;
1719 tmp = LLVMBuildSub(ctx->builder, LLVMConstInt(ctx->i32, denormal_exp, false), ctlz, "");
1720 tmp = LLVMBuildShl(ctx->builder, tmp, LLVMConstInt(ctx->i32, 23, false), "");
1721 denormal = LLVMBuildAdd(ctx->builder, denormal, tmp, "");
1722
1723 /* Select the final result. */
1724 LLVMValueRef result;
1725
1726 tmp = LLVMBuildICmp(ctx->builder, LLVMIntUGE, src,
1727 LLVMConstInt(ctx->i32, ((1 << exp_bits) - 1) << mant_bits, false), "");
1728 result = LLVMBuildSelect(ctx->builder, tmp, naninf, normal, "");
1729
1730 tmp = LLVMBuildICmp(ctx->builder, LLVMIntUGE, src,
1731 LLVMConstInt(ctx->i32, 1 << mant_bits, false), "");
1732 result = LLVMBuildSelect(ctx->builder, tmp, result, denormal, "");
1733
1734 tmp = LLVMBuildICmp(ctx->builder, LLVMIntNE, src, ctx->i32_0, "");
1735 result = LLVMBuildSelect(ctx->builder, tmp, result, ctx->i32_0, "");
1736
1737 return ac_to_float(ctx, result);
1738 }
1739
1740 /**
1741 * Generate a fully general open coded buffer format fetch with all required
1742 * fixups suitable for vertex fetch, using non-format buffer loads.
1743 *
1744 * Some combinations of argument values have special interpretations:
1745 * - size = 8 bytes, format = fixed indicates PIPE_FORMAT_R11G11B10_FLOAT
1746 * - size = 8 bytes, format != {float,fixed} indicates a 2_10_10_10 data format
1747 *
1748 * \param log_size log(size of channel in bytes)
1749 * \param num_channels number of channels (1 to 4)
1750 * \param format AC_FETCH_FORMAT_xxx value
1751 * \param reverse whether XYZ channels are reversed
1752 * \param known_aligned whether the source is known to be aligned to hardware's
1753 * effective element size for loading the given format
1754 * (note: this means dword alignment for 8_8_8_8, 16_16, etc.)
1755 * \param rsrc buffer resource descriptor
1756 * \return the resulting vector of floats or integers bitcast to <4 x i32>
1757 */
1758 LLVMValueRef
1759 ac_build_opencoded_load_format(struct ac_llvm_context *ctx,
1760 unsigned log_size,
1761 unsigned num_channels,
1762 unsigned format,
1763 bool reverse,
1764 bool known_aligned,
1765 LLVMValueRef rsrc,
1766 LLVMValueRef vindex,
1767 LLVMValueRef voffset,
1768 LLVMValueRef soffset,
1769 bool glc,
1770 bool slc,
1771 bool can_speculate)
1772 {
1773 LLVMValueRef tmp;
1774 unsigned load_log_size = log_size;
1775 unsigned load_num_channels = num_channels;
1776 if (log_size == 3) {
1777 load_log_size = 2;
1778 if (format == AC_FETCH_FORMAT_FLOAT) {
1779 load_num_channels = 2 * num_channels;
1780 } else {
1781 load_num_channels = 1; /* 10_11_11 or 2_10_10_10 */
1782 }
1783 }
1784
1785 int log_recombine = 0;
1786 if (ctx->chip_class == GFX6 && !known_aligned) {
1787 /* Avoid alignment restrictions by loading one byte at a time. */
1788 load_num_channels <<= load_log_size;
1789 log_recombine = load_log_size;
1790 load_log_size = 0;
1791 } else if (load_num_channels == 2 || load_num_channels == 4) {
1792 log_recombine = -util_logbase2(load_num_channels);
1793 load_num_channels = 1;
1794 load_log_size += -log_recombine;
1795 }
1796
1797 assert(load_log_size >= 2 || HAVE_LLVM >= 0x0900);
1798
1799 LLVMValueRef loads[32]; /* up to 32 bytes */
1800 for (unsigned i = 0; i < load_num_channels; ++i) {
1801 tmp = LLVMBuildAdd(ctx->builder, soffset,
1802 LLVMConstInt(ctx->i32, i << load_log_size, false), "");
1803 if (HAVE_LLVM >= 0x0800) {
1804 LLVMTypeRef channel_type = load_log_size == 0 ? ctx->i8 :
1805 load_log_size == 1 ? ctx->i16 : ctx->i32;
1806 unsigned num_channels = 1 << (MAX2(load_log_size, 2) - 2);
1807 loads[i] = ac_build_llvm8_buffer_load_common(
1808 ctx, rsrc, vindex, voffset, tmp,
1809 num_channels, channel_type, glc, slc,
1810 can_speculate, false, true);
1811 } else {
1812 tmp = LLVMBuildAdd(ctx->builder, voffset, tmp, "");
1813 loads[i] = ac_build_buffer_load_common(
1814 ctx, rsrc, vindex, tmp,
1815 1 << (load_log_size - 2), glc, slc, can_speculate, false);
1816 }
1817 if (load_log_size >= 2)
1818 loads[i] = ac_to_integer(ctx, loads[i]);
1819 }
1820
1821 if (log_recombine > 0) {
1822 /* Recombine bytes if necessary (GFX6 only) */
1823 LLVMTypeRef dst_type = log_recombine == 2 ? ctx->i32 : ctx->i16;
1824
1825 for (unsigned src = 0, dst = 0; src < load_num_channels; ++dst) {
1826 LLVMValueRef accum = NULL;
1827 for (unsigned i = 0; i < (1 << log_recombine); ++i, ++src) {
1828 tmp = LLVMBuildZExt(ctx->builder, loads[src], dst_type, "");
1829 if (i == 0) {
1830 accum = tmp;
1831 } else {
1832 tmp = LLVMBuildShl(ctx->builder, tmp,
1833 LLVMConstInt(dst_type, 8 * i, false), "");
1834 accum = LLVMBuildOr(ctx->builder, accum, tmp, "");
1835 }
1836 }
1837 loads[dst] = accum;
1838 }
1839 } else if (log_recombine < 0) {
1840 /* Split vectors of dwords */
1841 if (load_log_size > 2) {
1842 assert(load_num_channels == 1);
1843 LLVMValueRef loaded = loads[0];
1844 unsigned log_split = load_log_size - 2;
1845 log_recombine += log_split;
1846 load_num_channels = 1 << log_split;
1847 load_log_size = 2;
1848 for (unsigned i = 0; i < load_num_channels; ++i) {
1849 tmp = LLVMConstInt(ctx->i32, i, false);
1850 loads[i] = LLVMBuildExtractElement(ctx->builder, loaded, tmp, "");
1851 }
1852 }
1853
1854 /* Further split dwords and shorts if required */
1855 if (log_recombine < 0) {
1856 for (unsigned src = load_num_channels,
1857 dst = load_num_channels << -log_recombine;
1858 src > 0; --src) {
1859 unsigned dst_bits = 1 << (3 + load_log_size + log_recombine);
1860 LLVMTypeRef dst_type = LLVMIntTypeInContext(ctx->context, dst_bits);
1861 LLVMValueRef loaded = loads[src - 1];
1862 LLVMTypeRef loaded_type = LLVMTypeOf(loaded);
1863 for (unsigned i = 1 << -log_recombine; i > 0; --i, --dst) {
1864 tmp = LLVMConstInt(loaded_type, dst_bits * (i - 1), false);
1865 tmp = LLVMBuildLShr(ctx->builder, loaded, tmp, "");
1866 loads[dst - 1] = LLVMBuildTrunc(ctx->builder, tmp, dst_type, "");
1867 }
1868 }
1869 }
1870 }
1871
1872 if (log_size == 3) {
1873 if (format == AC_FETCH_FORMAT_FLOAT) {
1874 for (unsigned i = 0; i < num_channels; ++i) {
1875 tmp = ac_build_gather_values(ctx, &loads[2 * i], 2);
1876 loads[i] = LLVMBuildBitCast(ctx->builder, tmp, ctx->f64, "");
1877 }
1878 } else if (format == AC_FETCH_FORMAT_FIXED) {
1879 /* 10_11_11_FLOAT */
1880 LLVMValueRef data = loads[0];
1881 LLVMValueRef i32_2047 = LLVMConstInt(ctx->i32, 2047, false);
1882 LLVMValueRef r = LLVMBuildAnd(ctx->builder, data, i32_2047, "");
1883 tmp = LLVMBuildLShr(ctx->builder, data, LLVMConstInt(ctx->i32, 11, false), "");
1884 LLVMValueRef g = LLVMBuildAnd(ctx->builder, tmp, i32_2047, "");
1885 LLVMValueRef b = LLVMBuildLShr(ctx->builder, data, LLVMConstInt(ctx->i32, 22, false), "");
1886
1887 loads[0] = ac_to_integer(ctx, ac_ufN_to_float(ctx, r, 5, 6));
1888 loads[1] = ac_to_integer(ctx, ac_ufN_to_float(ctx, g, 5, 6));
1889 loads[2] = ac_to_integer(ctx, ac_ufN_to_float(ctx, b, 5, 5));
1890
1891 num_channels = 3;
1892 log_size = 2;
1893 format = AC_FETCH_FORMAT_FLOAT;
1894 } else {
1895 /* 2_10_10_10 data formats */
1896 LLVMValueRef data = loads[0];
1897 LLVMTypeRef i10 = LLVMIntTypeInContext(ctx->context, 10);
1898 LLVMTypeRef i2 = LLVMIntTypeInContext(ctx->context, 2);
1899 loads[0] = LLVMBuildTrunc(ctx->builder, data, i10, "");
1900 tmp = LLVMBuildLShr(ctx->builder, data, LLVMConstInt(ctx->i32, 10, false), "");
1901 loads[1] = LLVMBuildTrunc(ctx->builder, tmp, i10, "");
1902 tmp = LLVMBuildLShr(ctx->builder, data, LLVMConstInt(ctx->i32, 20, false), "");
1903 loads[2] = LLVMBuildTrunc(ctx->builder, tmp, i10, "");
1904 tmp = LLVMBuildLShr(ctx->builder, data, LLVMConstInt(ctx->i32, 30, false), "");
1905 loads[3] = LLVMBuildTrunc(ctx->builder, tmp, i2, "");
1906
1907 num_channels = 4;
1908 }
1909 }
1910
1911 if (format == AC_FETCH_FORMAT_FLOAT) {
1912 if (log_size != 2) {
1913 for (unsigned chan = 0; chan < num_channels; ++chan) {
1914 tmp = ac_to_float(ctx, loads[chan]);
1915 if (log_size == 3)
1916 tmp = LLVMBuildFPTrunc(ctx->builder, tmp, ctx->f32, "");
1917 else if (log_size == 1)
1918 tmp = LLVMBuildFPExt(ctx->builder, tmp, ctx->f32, "");
1919 loads[chan] = ac_to_integer(ctx, tmp);
1920 }
1921 }
1922 } else if (format == AC_FETCH_FORMAT_UINT) {
1923 if (log_size != 2) {
1924 for (unsigned chan = 0; chan < num_channels; ++chan)
1925 loads[chan] = LLVMBuildZExt(ctx->builder, loads[chan], ctx->i32, "");
1926 }
1927 } else if (format == AC_FETCH_FORMAT_SINT) {
1928 if (log_size != 2) {
1929 for (unsigned chan = 0; chan < num_channels; ++chan)
1930 loads[chan] = LLVMBuildSExt(ctx->builder, loads[chan], ctx->i32, "");
1931 }
1932 } else {
1933 bool unsign = format == AC_FETCH_FORMAT_UNORM ||
1934 format == AC_FETCH_FORMAT_USCALED ||
1935 format == AC_FETCH_FORMAT_UINT;
1936
1937 for (unsigned chan = 0; chan < num_channels; ++chan) {
1938 if (unsign) {
1939 tmp = LLVMBuildUIToFP(ctx->builder, loads[chan], ctx->f32, "");
1940 } else {
1941 tmp = LLVMBuildSIToFP(ctx->builder, loads[chan], ctx->f32, "");
1942 }
1943
1944 LLVMValueRef scale = NULL;
1945 if (format == AC_FETCH_FORMAT_FIXED) {
1946 assert(log_size == 2);
1947 scale = LLVMConstReal(ctx->f32, 1.0 / 0x10000);
1948 } else if (format == AC_FETCH_FORMAT_UNORM) {
1949 unsigned bits = LLVMGetIntTypeWidth(LLVMTypeOf(loads[chan]));
1950 scale = LLVMConstReal(ctx->f32, 1.0 / (((uint64_t)1 << bits) - 1));
1951 } else if (format == AC_FETCH_FORMAT_SNORM) {
1952 unsigned bits = LLVMGetIntTypeWidth(LLVMTypeOf(loads[chan]));
1953 scale = LLVMConstReal(ctx->f32, 1.0 / (((uint64_t)1 << (bits - 1)) - 1));
1954 }
1955 if (scale)
1956 tmp = LLVMBuildFMul(ctx->builder, tmp, scale, "");
1957
1958 if (format == AC_FETCH_FORMAT_SNORM) {
1959 /* Clamp to [-1, 1] */
1960 LLVMValueRef neg_one = LLVMConstReal(ctx->f32, -1.0);
1961 LLVMValueRef clamp =
1962 LLVMBuildFCmp(ctx->builder, LLVMRealULT, tmp, neg_one, "");
1963 tmp = LLVMBuildSelect(ctx->builder, clamp, neg_one, tmp, "");
1964 }
1965
1966 loads[chan] = ac_to_integer(ctx, tmp);
1967 }
1968 }
1969
1970 while (num_channels < 4) {
1971 if (format == AC_FETCH_FORMAT_UINT || format == AC_FETCH_FORMAT_SINT) {
1972 loads[num_channels] = num_channels == 3 ? ctx->i32_1 : ctx->i32_0;
1973 } else {
1974 loads[num_channels] = ac_to_integer(ctx, num_channels == 3 ? ctx->f32_1 : ctx->f32_0);
1975 }
1976 num_channels++;
1977 }
1978
1979 if (reverse) {
1980 tmp = loads[0];
1981 loads[0] = loads[2];
1982 loads[2] = tmp;
1983 }
1984
1985 return ac_build_gather_values(ctx, loads, 4);
1986 }
1987
1988 static void
1989 ac_build_llvm8_tbuffer_store(struct ac_llvm_context *ctx,
1990 LLVMValueRef rsrc,
1991 LLVMValueRef vdata,
1992 LLVMValueRef vindex,
1993 LLVMValueRef voffset,
1994 LLVMValueRef soffset,
1995 unsigned num_channels,
1996 unsigned dfmt,
1997 unsigned nfmt,
1998 bool glc,
1999 bool slc,
2000 bool writeonly_memory,
2001 bool structurized)
2002 {
2003 LLVMValueRef args[7];
2004 int idx = 0;
2005 args[idx++] = vdata;
2006 args[idx++] = LLVMBuildBitCast(ctx->builder, rsrc, ctx->v4i32, "");
2007 if (structurized)
2008 args[idx++] = vindex ? vindex : ctx->i32_0;
2009 args[idx++] = voffset ? voffset : ctx->i32_0;
2010 args[idx++] = soffset ? soffset : ctx->i32_0;
2011 args[idx++] = LLVMConstInt(ctx->i32, dfmt | (nfmt << 4), 0);
2012 args[idx++] = LLVMConstInt(ctx->i32, (glc ? 1 : 0) + (slc ? 2 : 0), 0);
2013 unsigned func = num_channels == 3 ? 4 : num_channels;
2014 const char *indexing_kind = structurized ? "struct" : "raw";
2015 char name[256], type_name[8];
2016
2017 LLVMTypeRef type = func > 1 ? LLVMVectorType(ctx->i32, func) : ctx->i32;
2018 ac_build_type_name_for_intr(type, type_name, sizeof(type_name));
2019
2020 snprintf(name, sizeof(name), "llvm.amdgcn.%s.tbuffer.store.%s",
2021 indexing_kind, type_name);
2022
2023 ac_build_intrinsic(ctx, name, ctx->voidt, args, idx,
2024 ac_get_store_intr_attribs(writeonly_memory));
2025 }
2026
2027 static void
2028 ac_build_tbuffer_store(struct ac_llvm_context *ctx,
2029 LLVMValueRef rsrc,
2030 LLVMValueRef vdata,
2031 LLVMValueRef vindex,
2032 LLVMValueRef voffset,
2033 LLVMValueRef soffset,
2034 LLVMValueRef immoffset,
2035 unsigned num_channels,
2036 unsigned dfmt,
2037 unsigned nfmt,
2038 bool glc,
2039 bool slc,
2040 bool writeonly_memory,
2041 bool structurized) /* only matters for LLVM 8+ */
2042 {
2043 if (HAVE_LLVM >= 0x800) {
2044 voffset = LLVMBuildAdd(ctx->builder,
2045 voffset ? voffset : ctx->i32_0,
2046 immoffset, "");
2047
2048 ac_build_llvm8_tbuffer_store(ctx, rsrc, vdata, vindex, voffset,
2049 soffset, num_channels, dfmt, nfmt,
2050 glc, slc, writeonly_memory,
2051 structurized);
2052 } else {
2053 LLVMValueRef params[] = {
2054 vdata,
2055 rsrc,
2056 vindex ? vindex : ctx->i32_0,
2057 voffset ? voffset : ctx->i32_0,
2058 soffset ? soffset : ctx->i32_0,
2059 immoffset,
2060 LLVMConstInt(ctx->i32, dfmt, false),
2061 LLVMConstInt(ctx->i32, nfmt, false),
2062 LLVMConstInt(ctx->i1, glc, false),
2063 LLVMConstInt(ctx->i1, slc, false),
2064 };
2065 unsigned func = CLAMP(num_channels, 1, 3) - 1;
2066 const char *type_names[] = {"i32", "v2i32", "v4i32"};
2067 char name[256];
2068
2069 snprintf(name, sizeof(name), "llvm.amdgcn.tbuffer.store.%s",
2070 type_names[func]);
2071
2072 ac_build_intrinsic(ctx, name, ctx->voidt, params, 10,
2073 ac_get_store_intr_attribs(writeonly_memory));
2074 }
2075 }
2076
2077 void
2078 ac_build_struct_tbuffer_store(struct ac_llvm_context *ctx,
2079 LLVMValueRef rsrc,
2080 LLVMValueRef vdata,
2081 LLVMValueRef vindex,
2082 LLVMValueRef voffset,
2083 LLVMValueRef soffset,
2084 LLVMValueRef immoffset,
2085 unsigned num_channels,
2086 unsigned dfmt,
2087 unsigned nfmt,
2088 bool glc,
2089 bool slc,
2090 bool writeonly_memory)
2091 {
2092 ac_build_tbuffer_store(ctx, rsrc, vdata, vindex, voffset, soffset,
2093 immoffset, num_channels, dfmt, nfmt, glc, slc,
2094 writeonly_memory, true);
2095 }
2096
2097 void
2098 ac_build_raw_tbuffer_store(struct ac_llvm_context *ctx,
2099 LLVMValueRef rsrc,
2100 LLVMValueRef vdata,
2101 LLVMValueRef voffset,
2102 LLVMValueRef soffset,
2103 LLVMValueRef immoffset,
2104 unsigned num_channels,
2105 unsigned dfmt,
2106 unsigned nfmt,
2107 bool glc,
2108 bool slc,
2109 bool writeonly_memory)
2110 {
2111 ac_build_tbuffer_store(ctx, rsrc, vdata, NULL, voffset, soffset,
2112 immoffset, num_channels, dfmt, nfmt, glc, slc,
2113 writeonly_memory, false);
2114 }
2115
2116 void
2117 ac_build_tbuffer_store_short(struct ac_llvm_context *ctx,
2118 LLVMValueRef rsrc,
2119 LLVMValueRef vdata,
2120 LLVMValueRef voffset,
2121 LLVMValueRef soffset,
2122 bool glc,
2123 bool writeonly_memory)
2124 {
2125 vdata = LLVMBuildBitCast(ctx->builder, vdata, ctx->i16, "");
2126
2127 if (HAVE_LLVM >= 0x900) {
2128 /* LLVM 9+ supports i8/i16 with struct/raw intrinsics. */
2129 ac_build_llvm8_buffer_store_common(ctx, rsrc, vdata, NULL,
2130 voffset, soffset, 1,
2131 ctx->i16, glc, false,
2132 writeonly_memory, false,
2133 false);
2134 } else {
2135 unsigned dfmt = V_008F0C_BUF_DATA_FORMAT_16;
2136 unsigned nfmt = V_008F0C_BUF_NUM_FORMAT_UINT;
2137
2138 vdata = LLVMBuildZExt(ctx->builder, vdata, ctx->i32, "");
2139
2140 ac_build_raw_tbuffer_store(ctx, rsrc, vdata, voffset, soffset,
2141 ctx->i32_0, 1, dfmt, nfmt, glc, false,
2142 writeonly_memory);
2143 }
2144 }
2145
2146 void
2147 ac_build_tbuffer_store_byte(struct ac_llvm_context *ctx,
2148 LLVMValueRef rsrc,
2149 LLVMValueRef vdata,
2150 LLVMValueRef voffset,
2151 LLVMValueRef soffset,
2152 bool glc,
2153 bool writeonly_memory)
2154 {
2155 vdata = LLVMBuildBitCast(ctx->builder, vdata, ctx->i8, "");
2156
2157 if (HAVE_LLVM >= 0x900) {
2158 /* LLVM 9+ supports i8/i16 with struct/raw intrinsics. */
2159 ac_build_llvm8_buffer_store_common(ctx, rsrc, vdata, NULL,
2160 voffset, soffset, 1,
2161 ctx->i8, glc, false,
2162 writeonly_memory, false,
2163 false);
2164 } else {
2165 unsigned dfmt = V_008F0C_BUF_DATA_FORMAT_8;
2166 unsigned nfmt = V_008F0C_BUF_NUM_FORMAT_UINT;
2167
2168 vdata = LLVMBuildZExt(ctx->builder, vdata, ctx->i32, "");
2169
2170 ac_build_raw_tbuffer_store(ctx, rsrc, vdata, voffset, soffset,
2171 ctx->i32_0, 1, dfmt, nfmt, glc, false,
2172 writeonly_memory);
2173 }
2174 }
2175 /**
2176 * Set range metadata on an instruction. This can only be used on load and
2177 * call instructions. If you know an instruction can only produce the values
2178 * 0, 1, 2, you would do set_range_metadata(value, 0, 3);
2179 * \p lo is the minimum value inclusive.
2180 * \p hi is the maximum value exclusive.
2181 */
2182 static void set_range_metadata(struct ac_llvm_context *ctx,
2183 LLVMValueRef value, unsigned lo, unsigned hi)
2184 {
2185 LLVMValueRef range_md, md_args[2];
2186 LLVMTypeRef type = LLVMTypeOf(value);
2187 LLVMContextRef context = LLVMGetTypeContext(type);
2188
2189 md_args[0] = LLVMConstInt(type, lo, false);
2190 md_args[1] = LLVMConstInt(type, hi, false);
2191 range_md = LLVMMDNodeInContext(context, md_args, 2);
2192 LLVMSetMetadata(value, ctx->range_md_kind, range_md);
2193 }
2194
2195 LLVMValueRef
2196 ac_get_thread_id(struct ac_llvm_context *ctx)
2197 {
2198 LLVMValueRef tid;
2199
2200 LLVMValueRef tid_args[2];
2201 tid_args[0] = LLVMConstInt(ctx->i32, 0xffffffff, false);
2202 tid_args[1] = ctx->i32_0;
2203 tid_args[1] = ac_build_intrinsic(ctx,
2204 "llvm.amdgcn.mbcnt.lo", ctx->i32,
2205 tid_args, 2, AC_FUNC_ATTR_READNONE);
2206
2207 tid = ac_build_intrinsic(ctx, "llvm.amdgcn.mbcnt.hi",
2208 ctx->i32, tid_args,
2209 2, AC_FUNC_ATTR_READNONE);
2210 set_range_metadata(ctx, tid, 0, 64);
2211 return tid;
2212 }
2213
2214 /*
2215 * AMD GCN implements derivatives using the local data store (LDS)
2216 * All writes to the LDS happen in all executing threads at
2217 * the same time. TID is the Thread ID for the current
2218 * thread and is a value between 0 and 63, representing
2219 * the thread's position in the wavefront.
2220 *
2221 * For the pixel shader threads are grouped into quads of four pixels.
2222 * The TIDs of the pixels of a quad are:
2223 *
2224 * +------+------+
2225 * |4n + 0|4n + 1|
2226 * +------+------+
2227 * |4n + 2|4n + 3|
2228 * +------+------+
2229 *
2230 * So, masking the TID with 0xfffffffc yields the TID of the top left pixel
2231 * of the quad, masking with 0xfffffffd yields the TID of the top pixel of
2232 * the current pixel's column, and masking with 0xfffffffe yields the TID
2233 * of the left pixel of the current pixel's row.
2234 *
2235 * Adding 1 yields the TID of the pixel to the right of the left pixel, and
2236 * adding 2 yields the TID of the pixel below the top pixel.
2237 */
2238 LLVMValueRef
2239 ac_build_ddxy(struct ac_llvm_context *ctx,
2240 uint32_t mask,
2241 int idx,
2242 LLVMValueRef val)
2243 {
2244 unsigned tl_lanes[4], trbl_lanes[4];
2245 char name[32], type[8];
2246 LLVMValueRef tl, trbl;
2247 LLVMTypeRef result_type;
2248 LLVMValueRef result;
2249
2250 result_type = ac_to_float_type(ctx, LLVMTypeOf(val));
2251
2252 if (result_type == ctx->f16)
2253 val = LLVMBuildZExt(ctx->builder, val, ctx->i32, "");
2254
2255 for (unsigned i = 0; i < 4; ++i) {
2256 tl_lanes[i] = i & mask;
2257 trbl_lanes[i] = (i & mask) + idx;
2258 }
2259
2260 tl = ac_build_quad_swizzle(ctx, val,
2261 tl_lanes[0], tl_lanes[1],
2262 tl_lanes[2], tl_lanes[3]);
2263 trbl = ac_build_quad_swizzle(ctx, val,
2264 trbl_lanes[0], trbl_lanes[1],
2265 trbl_lanes[2], trbl_lanes[3]);
2266
2267 if (result_type == ctx->f16) {
2268 tl = LLVMBuildTrunc(ctx->builder, tl, ctx->i16, "");
2269 trbl = LLVMBuildTrunc(ctx->builder, trbl, ctx->i16, "");
2270 }
2271
2272 tl = LLVMBuildBitCast(ctx->builder, tl, result_type, "");
2273 trbl = LLVMBuildBitCast(ctx->builder, trbl, result_type, "");
2274 result = LLVMBuildFSub(ctx->builder, trbl, tl, "");
2275
2276 ac_build_type_name_for_intr(result_type, type, sizeof(type));
2277 snprintf(name, sizeof(name), "llvm.amdgcn.wqm.%s", type);
2278
2279 return ac_build_intrinsic(ctx, name, result_type, &result, 1, 0);
2280 }
2281
2282 void
2283 ac_build_sendmsg(struct ac_llvm_context *ctx,
2284 uint32_t msg,
2285 LLVMValueRef wave_id)
2286 {
2287 LLVMValueRef args[2];
2288 args[0] = LLVMConstInt(ctx->i32, msg, false);
2289 args[1] = wave_id;
2290 ac_build_intrinsic(ctx, "llvm.amdgcn.s.sendmsg", ctx->voidt, args, 2, 0);
2291 }
2292
2293 LLVMValueRef
2294 ac_build_imsb(struct ac_llvm_context *ctx,
2295 LLVMValueRef arg,
2296 LLVMTypeRef dst_type)
2297 {
2298 LLVMValueRef msb = ac_build_intrinsic(ctx, "llvm.amdgcn.sffbh.i32",
2299 dst_type, &arg, 1,
2300 AC_FUNC_ATTR_READNONE);
2301
2302 /* The HW returns the last bit index from MSB, but NIR/TGSI wants
2303 * the index from LSB. Invert it by doing "31 - msb". */
2304 msb = LLVMBuildSub(ctx->builder, LLVMConstInt(ctx->i32, 31, false),
2305 msb, "");
2306
2307 LLVMValueRef all_ones = LLVMConstInt(ctx->i32, -1, true);
2308 LLVMValueRef cond = LLVMBuildOr(ctx->builder,
2309 LLVMBuildICmp(ctx->builder, LLVMIntEQ,
2310 arg, ctx->i32_0, ""),
2311 LLVMBuildICmp(ctx->builder, LLVMIntEQ,
2312 arg, all_ones, ""), "");
2313
2314 return LLVMBuildSelect(ctx->builder, cond, all_ones, msb, "");
2315 }
2316
2317 LLVMValueRef
2318 ac_build_umsb(struct ac_llvm_context *ctx,
2319 LLVMValueRef arg,
2320 LLVMTypeRef dst_type)
2321 {
2322 const char *intrin_name;
2323 LLVMTypeRef type;
2324 LLVMValueRef highest_bit;
2325 LLVMValueRef zero;
2326 unsigned bitsize;
2327
2328 bitsize = ac_get_elem_bits(ctx, LLVMTypeOf(arg));
2329 switch (bitsize) {
2330 case 64:
2331 intrin_name = "llvm.ctlz.i64";
2332 type = ctx->i64;
2333 highest_bit = LLVMConstInt(ctx->i64, 63, false);
2334 zero = ctx->i64_0;
2335 break;
2336 case 32:
2337 intrin_name = "llvm.ctlz.i32";
2338 type = ctx->i32;
2339 highest_bit = LLVMConstInt(ctx->i32, 31, false);
2340 zero = ctx->i32_0;
2341 break;
2342 case 16:
2343 intrin_name = "llvm.ctlz.i16";
2344 type = ctx->i16;
2345 highest_bit = LLVMConstInt(ctx->i16, 15, false);
2346 zero = ctx->i16_0;
2347 break;
2348 case 8:
2349 intrin_name = "llvm.ctlz.i8";
2350 type = ctx->i8;
2351 highest_bit = LLVMConstInt(ctx->i8, 7, false);
2352 zero = ctx->i8_0;
2353 break;
2354 default:
2355 unreachable(!"invalid bitsize");
2356 break;
2357 }
2358
2359 LLVMValueRef params[2] = {
2360 arg,
2361 ctx->i1true,
2362 };
2363
2364 LLVMValueRef msb = ac_build_intrinsic(ctx, intrin_name, type,
2365 params, 2,
2366 AC_FUNC_ATTR_READNONE);
2367
2368 /* The HW returns the last bit index from MSB, but TGSI/NIR wants
2369 * the index from LSB. Invert it by doing "31 - msb". */
2370 msb = LLVMBuildSub(ctx->builder, highest_bit, msb, "");
2371
2372 if (bitsize == 64) {
2373 msb = LLVMBuildTrunc(ctx->builder, msb, ctx->i32, "");
2374 } else if (bitsize < 32) {
2375 msb = LLVMBuildSExt(ctx->builder, msb, ctx->i32, "");
2376 }
2377
2378 /* check for zero */
2379 return LLVMBuildSelect(ctx->builder,
2380 LLVMBuildICmp(ctx->builder, LLVMIntEQ, arg, zero, ""),
2381 LLVMConstInt(ctx->i32, -1, true), msb, "");
2382 }
2383
2384 LLVMValueRef ac_build_fmin(struct ac_llvm_context *ctx, LLVMValueRef a,
2385 LLVMValueRef b)
2386 {
2387 char name[64];
2388 snprintf(name, sizeof(name), "llvm.minnum.f%d", ac_get_elem_bits(ctx, LLVMTypeOf(a)));
2389 LLVMValueRef args[2] = {a, b};
2390 return ac_build_intrinsic(ctx, name, LLVMTypeOf(a), args, 2,
2391 AC_FUNC_ATTR_READNONE);
2392 }
2393
2394 LLVMValueRef ac_build_fmax(struct ac_llvm_context *ctx, LLVMValueRef a,
2395 LLVMValueRef b)
2396 {
2397 char name[64];
2398 snprintf(name, sizeof(name), "llvm.maxnum.f%d", ac_get_elem_bits(ctx, LLVMTypeOf(a)));
2399 LLVMValueRef args[2] = {a, b};
2400 return ac_build_intrinsic(ctx, name, LLVMTypeOf(a), args, 2,
2401 AC_FUNC_ATTR_READNONE);
2402 }
2403
2404 LLVMValueRef ac_build_imin(struct ac_llvm_context *ctx, LLVMValueRef a,
2405 LLVMValueRef b)
2406 {
2407 LLVMValueRef cmp = LLVMBuildICmp(ctx->builder, LLVMIntSLE, a, b, "");
2408 return LLVMBuildSelect(ctx->builder, cmp, a, b, "");
2409 }
2410
2411 LLVMValueRef ac_build_imax(struct ac_llvm_context *ctx, LLVMValueRef a,
2412 LLVMValueRef b)
2413 {
2414 LLVMValueRef cmp = LLVMBuildICmp(ctx->builder, LLVMIntSGT, a, b, "");
2415 return LLVMBuildSelect(ctx->builder, cmp, a, b, "");
2416 }
2417
2418 LLVMValueRef ac_build_umin(struct ac_llvm_context *ctx, LLVMValueRef a,
2419 LLVMValueRef b)
2420 {
2421 LLVMValueRef cmp = LLVMBuildICmp(ctx->builder, LLVMIntULE, a, b, "");
2422 return LLVMBuildSelect(ctx->builder, cmp, a, b, "");
2423 }
2424
2425 LLVMValueRef ac_build_umax(struct ac_llvm_context *ctx, LLVMValueRef a,
2426 LLVMValueRef b)
2427 {
2428 LLVMValueRef cmp = LLVMBuildICmp(ctx->builder, LLVMIntUGE, a, b, "");
2429 return LLVMBuildSelect(ctx->builder, cmp, a, b, "");
2430 }
2431
2432 LLVMValueRef ac_build_clamp(struct ac_llvm_context *ctx, LLVMValueRef value)
2433 {
2434 LLVMTypeRef t = LLVMTypeOf(value);
2435 return ac_build_fmin(ctx, ac_build_fmax(ctx, value, LLVMConstReal(t, 0.0)),
2436 LLVMConstReal(t, 1.0));
2437 }
2438
2439 void ac_build_export(struct ac_llvm_context *ctx, struct ac_export_args *a)
2440 {
2441 LLVMValueRef args[9];
2442
2443 args[0] = LLVMConstInt(ctx->i32, a->target, 0);
2444 args[1] = LLVMConstInt(ctx->i32, a->enabled_channels, 0);
2445
2446 if (a->compr) {
2447 LLVMTypeRef i16 = LLVMInt16TypeInContext(ctx->context);
2448 LLVMTypeRef v2i16 = LLVMVectorType(i16, 2);
2449
2450 args[2] = LLVMBuildBitCast(ctx->builder, a->out[0],
2451 v2i16, "");
2452 args[3] = LLVMBuildBitCast(ctx->builder, a->out[1],
2453 v2i16, "");
2454 args[4] = LLVMConstInt(ctx->i1, a->done, 0);
2455 args[5] = LLVMConstInt(ctx->i1, a->valid_mask, 0);
2456
2457 ac_build_intrinsic(ctx, "llvm.amdgcn.exp.compr.v2i16",
2458 ctx->voidt, args, 6, 0);
2459 } else {
2460 args[2] = a->out[0];
2461 args[3] = a->out[1];
2462 args[4] = a->out[2];
2463 args[5] = a->out[3];
2464 args[6] = LLVMConstInt(ctx->i1, a->done, 0);
2465 args[7] = LLVMConstInt(ctx->i1, a->valid_mask, 0);
2466
2467 ac_build_intrinsic(ctx, "llvm.amdgcn.exp.f32",
2468 ctx->voidt, args, 8, 0);
2469 }
2470 }
2471
2472 void ac_build_export_null(struct ac_llvm_context *ctx)
2473 {
2474 struct ac_export_args args;
2475
2476 args.enabled_channels = 0x0; /* enabled channels */
2477 args.valid_mask = 1; /* whether the EXEC mask is valid */
2478 args.done = 1; /* DONE bit */
2479 args.target = V_008DFC_SQ_EXP_NULL;
2480 args.compr = 0; /* COMPR flag (0 = 32-bit export) */
2481 args.out[0] = LLVMGetUndef(ctx->f32); /* R */
2482 args.out[1] = LLVMGetUndef(ctx->f32); /* G */
2483 args.out[2] = LLVMGetUndef(ctx->f32); /* B */
2484 args.out[3] = LLVMGetUndef(ctx->f32); /* A */
2485
2486 ac_build_export(ctx, &args);
2487 }
2488
2489 static unsigned ac_num_coords(enum ac_image_dim dim)
2490 {
2491 switch (dim) {
2492 case ac_image_1d:
2493 return 1;
2494 case ac_image_2d:
2495 case ac_image_1darray:
2496 return 2;
2497 case ac_image_3d:
2498 case ac_image_cube:
2499 case ac_image_2darray:
2500 case ac_image_2dmsaa:
2501 return 3;
2502 case ac_image_2darraymsaa:
2503 return 4;
2504 default:
2505 unreachable("ac_num_coords: bad dim");
2506 }
2507 }
2508
2509 static unsigned ac_num_derivs(enum ac_image_dim dim)
2510 {
2511 switch (dim) {
2512 case ac_image_1d:
2513 case ac_image_1darray:
2514 return 2;
2515 case ac_image_2d:
2516 case ac_image_2darray:
2517 case ac_image_cube:
2518 return 4;
2519 case ac_image_3d:
2520 return 6;
2521 case ac_image_2dmsaa:
2522 case ac_image_2darraymsaa:
2523 default:
2524 unreachable("derivatives not supported");
2525 }
2526 }
2527
2528 static const char *get_atomic_name(enum ac_atomic_op op)
2529 {
2530 switch (op) {
2531 case ac_atomic_swap: return "swap";
2532 case ac_atomic_add: return "add";
2533 case ac_atomic_sub: return "sub";
2534 case ac_atomic_smin: return "smin";
2535 case ac_atomic_umin: return "umin";
2536 case ac_atomic_smax: return "smax";
2537 case ac_atomic_umax: return "umax";
2538 case ac_atomic_and: return "and";
2539 case ac_atomic_or: return "or";
2540 case ac_atomic_xor: return "xor";
2541 }
2542 unreachable("bad atomic op");
2543 }
2544
2545 LLVMValueRef ac_build_image_opcode(struct ac_llvm_context *ctx,
2546 struct ac_image_args *a)
2547 {
2548 const char *overload[3] = { "", "", "" };
2549 unsigned num_overloads = 0;
2550 LLVMValueRef args[18];
2551 unsigned num_args = 0;
2552 enum ac_image_dim dim = a->dim;
2553
2554 assert(!a->lod || a->lod == ctx->i32_0 || a->lod == ctx->f32_0 ||
2555 !a->level_zero);
2556 assert((a->opcode != ac_image_get_resinfo && a->opcode != ac_image_load_mip &&
2557 a->opcode != ac_image_store_mip) ||
2558 a->lod);
2559 assert(a->opcode == ac_image_sample || a->opcode == ac_image_gather4 ||
2560 (!a->compare && !a->offset));
2561 assert((a->opcode == ac_image_sample || a->opcode == ac_image_gather4 ||
2562 a->opcode == ac_image_get_lod) ||
2563 !a->bias);
2564 assert((a->bias ? 1 : 0) +
2565 (a->lod ? 1 : 0) +
2566 (a->level_zero ? 1 : 0) +
2567 (a->derivs[0] ? 1 : 0) <= 1);
2568
2569 if (a->opcode == ac_image_get_lod) {
2570 switch (dim) {
2571 case ac_image_1darray:
2572 dim = ac_image_1d;
2573 break;
2574 case ac_image_2darray:
2575 case ac_image_cube:
2576 dim = ac_image_2d;
2577 break;
2578 default:
2579 break;
2580 }
2581 }
2582
2583 bool sample = a->opcode == ac_image_sample ||
2584 a->opcode == ac_image_gather4 ||
2585 a->opcode == ac_image_get_lod;
2586 bool atomic = a->opcode == ac_image_atomic ||
2587 a->opcode == ac_image_atomic_cmpswap;
2588 LLVMTypeRef coord_type = sample ? ctx->f32 : ctx->i32;
2589
2590 if (atomic || a->opcode == ac_image_store || a->opcode == ac_image_store_mip) {
2591 args[num_args++] = a->data[0];
2592 if (a->opcode == ac_image_atomic_cmpswap)
2593 args[num_args++] = a->data[1];
2594 }
2595
2596 if (!atomic)
2597 args[num_args++] = LLVMConstInt(ctx->i32, a->dmask, false);
2598
2599 if (a->offset)
2600 args[num_args++] = ac_to_integer(ctx, a->offset);
2601 if (a->bias) {
2602 args[num_args++] = ac_to_float(ctx, a->bias);
2603 overload[num_overloads++] = ".f32";
2604 }
2605 if (a->compare)
2606 args[num_args++] = ac_to_float(ctx, a->compare);
2607 if (a->derivs[0]) {
2608 unsigned count = ac_num_derivs(dim);
2609 for (unsigned i = 0; i < count; ++i)
2610 args[num_args++] = ac_to_float(ctx, a->derivs[i]);
2611 overload[num_overloads++] = ".f32";
2612 }
2613 unsigned num_coords =
2614 a->opcode != ac_image_get_resinfo ? ac_num_coords(dim) : 0;
2615 for (unsigned i = 0; i < num_coords; ++i)
2616 args[num_args++] = LLVMBuildBitCast(ctx->builder, a->coords[i], coord_type, "");
2617 if (a->lod)
2618 args[num_args++] = LLVMBuildBitCast(ctx->builder, a->lod, coord_type, "");
2619 overload[num_overloads++] = sample ? ".f32" : ".i32";
2620
2621 args[num_args++] = a->resource;
2622 if (sample) {
2623 args[num_args++] = a->sampler;
2624 args[num_args++] = LLVMConstInt(ctx->i1, a->unorm, false);
2625 }
2626
2627 args[num_args++] = ctx->i32_0; /* texfailctrl */
2628 args[num_args++] = LLVMConstInt(ctx->i32, a->cache_policy, false);
2629
2630 const char *name;
2631 const char *atomic_subop = "";
2632 switch (a->opcode) {
2633 case ac_image_sample: name = "sample"; break;
2634 case ac_image_gather4: name = "gather4"; break;
2635 case ac_image_load: name = "load"; break;
2636 case ac_image_load_mip: name = "load.mip"; break;
2637 case ac_image_store: name = "store"; break;
2638 case ac_image_store_mip: name = "store.mip"; break;
2639 case ac_image_atomic:
2640 name = "atomic.";
2641 atomic_subop = get_atomic_name(a->atomic);
2642 break;
2643 case ac_image_atomic_cmpswap:
2644 name = "atomic.";
2645 atomic_subop = "cmpswap";
2646 break;
2647 case ac_image_get_lod: name = "getlod"; break;
2648 case ac_image_get_resinfo: name = "getresinfo"; break;
2649 default: unreachable("invalid image opcode");
2650 }
2651
2652 const char *dimname;
2653 switch (dim) {
2654 case ac_image_1d: dimname = "1d"; break;
2655 case ac_image_2d: dimname = "2d"; break;
2656 case ac_image_3d: dimname = "3d"; break;
2657 case ac_image_cube: dimname = "cube"; break;
2658 case ac_image_1darray: dimname = "1darray"; break;
2659 case ac_image_2darray: dimname = "2darray"; break;
2660 case ac_image_2dmsaa: dimname = "2dmsaa"; break;
2661 case ac_image_2darraymsaa: dimname = "2darraymsaa"; break;
2662 default: unreachable("invalid dim");
2663 }
2664
2665 bool lod_suffix =
2666 a->lod && (a->opcode == ac_image_sample || a->opcode == ac_image_gather4);
2667 char intr_name[96];
2668 snprintf(intr_name, sizeof(intr_name),
2669 "llvm.amdgcn.image.%s%s" /* base name */
2670 "%s%s%s" /* sample/gather modifiers */
2671 ".%s.%s%s%s%s", /* dimension and type overloads */
2672 name, atomic_subop,
2673 a->compare ? ".c" : "",
2674 a->bias ? ".b" :
2675 lod_suffix ? ".l" :
2676 a->derivs[0] ? ".d" :
2677 a->level_zero ? ".lz" : "",
2678 a->offset ? ".o" : "",
2679 dimname,
2680 atomic ? "i32" : "v4f32",
2681 overload[0], overload[1], overload[2]);
2682
2683 LLVMTypeRef retty;
2684 if (atomic)
2685 retty = ctx->i32;
2686 else if (a->opcode == ac_image_store || a->opcode == ac_image_store_mip)
2687 retty = ctx->voidt;
2688 else
2689 retty = ctx->v4f32;
2690
2691 LLVMValueRef result =
2692 ac_build_intrinsic(ctx, intr_name, retty, args, num_args,
2693 a->attributes);
2694 if (!sample && retty == ctx->v4f32) {
2695 result = LLVMBuildBitCast(ctx->builder, result,
2696 ctx->v4i32, "");
2697 }
2698 return result;
2699 }
2700
2701 LLVMValueRef ac_build_cvt_pkrtz_f16(struct ac_llvm_context *ctx,
2702 LLVMValueRef args[2])
2703 {
2704 LLVMTypeRef v2f16 =
2705 LLVMVectorType(LLVMHalfTypeInContext(ctx->context), 2);
2706
2707 return ac_build_intrinsic(ctx, "llvm.amdgcn.cvt.pkrtz", v2f16,
2708 args, 2, AC_FUNC_ATTR_READNONE);
2709 }
2710
2711 LLVMValueRef ac_build_cvt_pknorm_i16(struct ac_llvm_context *ctx,
2712 LLVMValueRef args[2])
2713 {
2714 LLVMValueRef res =
2715 ac_build_intrinsic(ctx, "llvm.amdgcn.cvt.pknorm.i16",
2716 ctx->v2i16, args, 2,
2717 AC_FUNC_ATTR_READNONE);
2718 return LLVMBuildBitCast(ctx->builder, res, ctx->i32, "");
2719 }
2720
2721 LLVMValueRef ac_build_cvt_pknorm_u16(struct ac_llvm_context *ctx,
2722 LLVMValueRef args[2])
2723 {
2724 LLVMValueRef res =
2725 ac_build_intrinsic(ctx, "llvm.amdgcn.cvt.pknorm.u16",
2726 ctx->v2i16, args, 2,
2727 AC_FUNC_ATTR_READNONE);
2728 return LLVMBuildBitCast(ctx->builder, res, ctx->i32, "");
2729 }
2730
2731 /* The 8-bit and 10-bit clamping is for HW workarounds. */
2732 LLVMValueRef ac_build_cvt_pk_i16(struct ac_llvm_context *ctx,
2733 LLVMValueRef args[2], unsigned bits, bool hi)
2734 {
2735 assert(bits == 8 || bits == 10 || bits == 16);
2736
2737 LLVMValueRef max_rgb = LLVMConstInt(ctx->i32,
2738 bits == 8 ? 127 : bits == 10 ? 511 : 32767, 0);
2739 LLVMValueRef min_rgb = LLVMConstInt(ctx->i32,
2740 bits == 8 ? -128 : bits == 10 ? -512 : -32768, 0);
2741 LLVMValueRef max_alpha =
2742 bits != 10 ? max_rgb : ctx->i32_1;
2743 LLVMValueRef min_alpha =
2744 bits != 10 ? min_rgb : LLVMConstInt(ctx->i32, -2, 0);
2745
2746 /* Clamp. */
2747 if (bits != 16) {
2748 for (int i = 0; i < 2; i++) {
2749 bool alpha = hi && i == 1;
2750 args[i] = ac_build_imin(ctx, args[i],
2751 alpha ? max_alpha : max_rgb);
2752 args[i] = ac_build_imax(ctx, args[i],
2753 alpha ? min_alpha : min_rgb);
2754 }
2755 }
2756
2757 LLVMValueRef res =
2758 ac_build_intrinsic(ctx, "llvm.amdgcn.cvt.pk.i16",
2759 ctx->v2i16, args, 2,
2760 AC_FUNC_ATTR_READNONE);
2761 return LLVMBuildBitCast(ctx->builder, res, ctx->i32, "");
2762 }
2763
2764 /* The 8-bit and 10-bit clamping is for HW workarounds. */
2765 LLVMValueRef ac_build_cvt_pk_u16(struct ac_llvm_context *ctx,
2766 LLVMValueRef args[2], unsigned bits, bool hi)
2767 {
2768 assert(bits == 8 || bits == 10 || bits == 16);
2769
2770 LLVMValueRef max_rgb = LLVMConstInt(ctx->i32,
2771 bits == 8 ? 255 : bits == 10 ? 1023 : 65535, 0);
2772 LLVMValueRef max_alpha =
2773 bits != 10 ? max_rgb : LLVMConstInt(ctx->i32, 3, 0);
2774
2775 /* Clamp. */
2776 if (bits != 16) {
2777 for (int i = 0; i < 2; i++) {
2778 bool alpha = hi && i == 1;
2779 args[i] = ac_build_umin(ctx, args[i],
2780 alpha ? max_alpha : max_rgb);
2781 }
2782 }
2783
2784 LLVMValueRef res =
2785 ac_build_intrinsic(ctx, "llvm.amdgcn.cvt.pk.u16",
2786 ctx->v2i16, args, 2,
2787 AC_FUNC_ATTR_READNONE);
2788 return LLVMBuildBitCast(ctx->builder, res, ctx->i32, "");
2789 }
2790
2791 LLVMValueRef ac_build_wqm_vote(struct ac_llvm_context *ctx, LLVMValueRef i1)
2792 {
2793 return ac_build_intrinsic(ctx, "llvm.amdgcn.wqm.vote", ctx->i1,
2794 &i1, 1, AC_FUNC_ATTR_READNONE);
2795 }
2796
2797 void ac_build_kill_if_false(struct ac_llvm_context *ctx, LLVMValueRef i1)
2798 {
2799 ac_build_intrinsic(ctx, "llvm.amdgcn.kill", ctx->voidt,
2800 &i1, 1, 0);
2801 }
2802
2803 LLVMValueRef ac_build_bfe(struct ac_llvm_context *ctx, LLVMValueRef input,
2804 LLVMValueRef offset, LLVMValueRef width,
2805 bool is_signed)
2806 {
2807 LLVMValueRef args[] = {
2808 input,
2809 offset,
2810 width,
2811 };
2812
2813 return ac_build_intrinsic(ctx,
2814 is_signed ? "llvm.amdgcn.sbfe.i32" :
2815 "llvm.amdgcn.ubfe.i32",
2816 ctx->i32, args, 3,
2817 AC_FUNC_ATTR_READNONE);
2818 }
2819
2820 LLVMValueRef ac_build_imad(struct ac_llvm_context *ctx, LLVMValueRef s0,
2821 LLVMValueRef s1, LLVMValueRef s2)
2822 {
2823 return LLVMBuildAdd(ctx->builder,
2824 LLVMBuildMul(ctx->builder, s0, s1, ""), s2, "");
2825 }
2826
2827 LLVMValueRef ac_build_fmad(struct ac_llvm_context *ctx, LLVMValueRef s0,
2828 LLVMValueRef s1, LLVMValueRef s2)
2829 {
2830 return LLVMBuildFAdd(ctx->builder,
2831 LLVMBuildFMul(ctx->builder, s0, s1, ""), s2, "");
2832 }
2833
2834 void ac_build_waitcnt(struct ac_llvm_context *ctx, unsigned simm16)
2835 {
2836 LLVMValueRef args[1] = {
2837 LLVMConstInt(ctx->i32, simm16, false),
2838 };
2839 ac_build_intrinsic(ctx, "llvm.amdgcn.s.waitcnt",
2840 ctx->voidt, args, 1, 0);
2841 }
2842
2843 LLVMValueRef ac_build_fmed3(struct ac_llvm_context *ctx, LLVMValueRef src0,
2844 LLVMValueRef src1, LLVMValueRef src2,
2845 unsigned bitsize)
2846 {
2847 LLVMTypeRef type;
2848 char *intr;
2849
2850 if (bitsize == 16) {
2851 intr = "llvm.amdgcn.fmed3.f16";
2852 type = ctx->f16;
2853 } else if (bitsize == 32) {
2854 intr = "llvm.amdgcn.fmed3.f32";
2855 type = ctx->f32;
2856 } else {
2857 intr = "llvm.amdgcn.fmed3.f64";
2858 type = ctx->f64;
2859 }
2860
2861 LLVMValueRef params[] = {
2862 src0,
2863 src1,
2864 src2,
2865 };
2866 return ac_build_intrinsic(ctx, intr, type, params, 3,
2867 AC_FUNC_ATTR_READNONE);
2868 }
2869
2870 LLVMValueRef ac_build_fract(struct ac_llvm_context *ctx, LLVMValueRef src0,
2871 unsigned bitsize)
2872 {
2873 LLVMTypeRef type;
2874 char *intr;
2875
2876 if (bitsize == 16) {
2877 intr = "llvm.amdgcn.fract.f16";
2878 type = ctx->f16;
2879 } else if (bitsize == 32) {
2880 intr = "llvm.amdgcn.fract.f32";
2881 type = ctx->f32;
2882 } else {
2883 intr = "llvm.amdgcn.fract.f64";
2884 type = ctx->f64;
2885 }
2886
2887 LLVMValueRef params[] = {
2888 src0,
2889 };
2890 return ac_build_intrinsic(ctx, intr, type, params, 1,
2891 AC_FUNC_ATTR_READNONE);
2892 }
2893
2894 LLVMValueRef ac_build_isign(struct ac_llvm_context *ctx, LLVMValueRef src0,
2895 unsigned bitsize)
2896 {
2897 LLVMTypeRef type = LLVMIntTypeInContext(ctx->context, bitsize);
2898 LLVMValueRef zero = LLVMConstInt(type, 0, false);
2899 LLVMValueRef one = LLVMConstInt(type, 1, false);
2900
2901 LLVMValueRef cmp, val;
2902 cmp = LLVMBuildICmp(ctx->builder, LLVMIntSGT, src0, zero, "");
2903 val = LLVMBuildSelect(ctx->builder, cmp, one, src0, "");
2904 cmp = LLVMBuildICmp(ctx->builder, LLVMIntSGE, val, zero, "");
2905 val = LLVMBuildSelect(ctx->builder, cmp, val, LLVMConstInt(type, -1, true), "");
2906 return val;
2907 }
2908
2909 LLVMValueRef ac_build_fsign(struct ac_llvm_context *ctx, LLVMValueRef src0,
2910 unsigned bitsize)
2911 {
2912 LLVMValueRef cmp, val, zero, one;
2913 LLVMTypeRef type;
2914
2915 if (bitsize == 16) {
2916 type = ctx->f16;
2917 zero = ctx->f16_0;
2918 one = ctx->f16_1;
2919 } else if (bitsize == 32) {
2920 type = ctx->f32;
2921 zero = ctx->f32_0;
2922 one = ctx->f32_1;
2923 } else {
2924 type = ctx->f64;
2925 zero = ctx->f64_0;
2926 one = ctx->f64_1;
2927 }
2928
2929 cmp = LLVMBuildFCmp(ctx->builder, LLVMRealOGT, src0, zero, "");
2930 val = LLVMBuildSelect(ctx->builder, cmp, one, src0, "");
2931 cmp = LLVMBuildFCmp(ctx->builder, LLVMRealOGE, val, zero, "");
2932 val = LLVMBuildSelect(ctx->builder, cmp, val, LLVMConstReal(type, -1.0), "");
2933 return val;
2934 }
2935
2936 LLVMValueRef ac_build_bit_count(struct ac_llvm_context *ctx, LLVMValueRef src0)
2937 {
2938 LLVMValueRef result;
2939 unsigned bitsize;
2940
2941 bitsize = ac_get_elem_bits(ctx, LLVMTypeOf(src0));
2942
2943 switch (bitsize) {
2944 case 64:
2945 result = ac_build_intrinsic(ctx, "llvm.ctpop.i64", ctx->i64,
2946 (LLVMValueRef []) { src0 }, 1,
2947 AC_FUNC_ATTR_READNONE);
2948
2949 result = LLVMBuildTrunc(ctx->builder, result, ctx->i32, "");
2950 break;
2951 case 32:
2952 result = ac_build_intrinsic(ctx, "llvm.ctpop.i32", ctx->i32,
2953 (LLVMValueRef []) { src0 }, 1,
2954 AC_FUNC_ATTR_READNONE);
2955 break;
2956 case 16:
2957 result = ac_build_intrinsic(ctx, "llvm.ctpop.i16", ctx->i16,
2958 (LLVMValueRef []) { src0 }, 1,
2959 AC_FUNC_ATTR_READNONE);
2960
2961 result = LLVMBuildZExt(ctx->builder, result, ctx->i32, "");
2962 break;
2963 case 8:
2964 result = ac_build_intrinsic(ctx, "llvm.ctpop.i8", ctx->i8,
2965 (LLVMValueRef []) { src0 }, 1,
2966 AC_FUNC_ATTR_READNONE);
2967
2968 result = LLVMBuildZExt(ctx->builder, result, ctx->i32, "");
2969 break;
2970 default:
2971 unreachable(!"invalid bitsize");
2972 break;
2973 }
2974
2975 return result;
2976 }
2977
2978 LLVMValueRef ac_build_bitfield_reverse(struct ac_llvm_context *ctx,
2979 LLVMValueRef src0)
2980 {
2981 LLVMValueRef result;
2982 unsigned bitsize;
2983
2984 bitsize = ac_get_elem_bits(ctx, LLVMTypeOf(src0));
2985
2986 switch (bitsize) {
2987 case 64:
2988 result = ac_build_intrinsic(ctx, "llvm.bitreverse.i64", ctx->i64,
2989 (LLVMValueRef []) { src0 }, 1,
2990 AC_FUNC_ATTR_READNONE);
2991
2992 result = LLVMBuildTrunc(ctx->builder, result, ctx->i32, "");
2993 break;
2994 case 32:
2995 result = ac_build_intrinsic(ctx, "llvm.bitreverse.i32", ctx->i32,
2996 (LLVMValueRef []) { src0 }, 1,
2997 AC_FUNC_ATTR_READNONE);
2998 break;
2999 case 16:
3000 result = ac_build_intrinsic(ctx, "llvm.bitreverse.i16", ctx->i16,
3001 (LLVMValueRef []) { src0 }, 1,
3002 AC_FUNC_ATTR_READNONE);
3003
3004 result = LLVMBuildZExt(ctx->builder, result, ctx->i32, "");
3005 break;
3006 case 8:
3007 result = ac_build_intrinsic(ctx, "llvm.bitreverse.i8", ctx->i8,
3008 (LLVMValueRef []) { src0 }, 1,
3009 AC_FUNC_ATTR_READNONE);
3010
3011 result = LLVMBuildZExt(ctx->builder, result, ctx->i32, "");
3012 break;
3013 default:
3014 unreachable(!"invalid bitsize");
3015 break;
3016 }
3017
3018 return result;
3019 }
3020
3021 #define AC_EXP_TARGET 0
3022 #define AC_EXP_ENABLED_CHANNELS 1
3023 #define AC_EXP_OUT0 2
3024
3025 enum ac_ir_type {
3026 AC_IR_UNDEF,
3027 AC_IR_CONST,
3028 AC_IR_VALUE,
3029 };
3030
3031 struct ac_vs_exp_chan
3032 {
3033 LLVMValueRef value;
3034 float const_float;
3035 enum ac_ir_type type;
3036 };
3037
3038 struct ac_vs_exp_inst {
3039 unsigned offset;
3040 LLVMValueRef inst;
3041 struct ac_vs_exp_chan chan[4];
3042 };
3043
3044 struct ac_vs_exports {
3045 unsigned num;
3046 struct ac_vs_exp_inst exp[VARYING_SLOT_MAX];
3047 };
3048
3049 /* Return true if the PARAM export has been eliminated. */
3050 static bool ac_eliminate_const_output(uint8_t *vs_output_param_offset,
3051 uint32_t num_outputs,
3052 struct ac_vs_exp_inst *exp)
3053 {
3054 unsigned i, default_val; /* SPI_PS_INPUT_CNTL_i.DEFAULT_VAL */
3055 bool is_zero[4] = {}, is_one[4] = {};
3056
3057 for (i = 0; i < 4; i++) {
3058 /* It's a constant expression. Undef outputs are eliminated too. */
3059 if (exp->chan[i].type == AC_IR_UNDEF) {
3060 is_zero[i] = true;
3061 is_one[i] = true;
3062 } else if (exp->chan[i].type == AC_IR_CONST) {
3063 if (exp->chan[i].const_float == 0)
3064 is_zero[i] = true;
3065 else if (exp->chan[i].const_float == 1)
3066 is_one[i] = true;
3067 else
3068 return false; /* other constant */
3069 } else
3070 return false;
3071 }
3072
3073 /* Only certain combinations of 0 and 1 can be eliminated. */
3074 if (is_zero[0] && is_zero[1] && is_zero[2])
3075 default_val = is_zero[3] ? 0 : 1;
3076 else if (is_one[0] && is_one[1] && is_one[2])
3077 default_val = is_zero[3] ? 2 : 3;
3078 else
3079 return false;
3080
3081 /* The PARAM export can be represented as DEFAULT_VAL. Kill it. */
3082 LLVMInstructionEraseFromParent(exp->inst);
3083
3084 /* Change OFFSET to DEFAULT_VAL. */
3085 for (i = 0; i < num_outputs; i++) {
3086 if (vs_output_param_offset[i] == exp->offset) {
3087 vs_output_param_offset[i] =
3088 AC_EXP_PARAM_DEFAULT_VAL_0000 + default_val;
3089 break;
3090 }
3091 }
3092 return true;
3093 }
3094
3095 static bool ac_eliminate_duplicated_output(struct ac_llvm_context *ctx,
3096 uint8_t *vs_output_param_offset,
3097 uint32_t num_outputs,
3098 struct ac_vs_exports *processed,
3099 struct ac_vs_exp_inst *exp)
3100 {
3101 unsigned p, copy_back_channels = 0;
3102
3103 /* See if the output is already in the list of processed outputs.
3104 * The LLVMValueRef comparison relies on SSA.
3105 */
3106 for (p = 0; p < processed->num; p++) {
3107 bool different = false;
3108
3109 for (unsigned j = 0; j < 4; j++) {
3110 struct ac_vs_exp_chan *c1 = &processed->exp[p].chan[j];
3111 struct ac_vs_exp_chan *c2 = &exp->chan[j];
3112
3113 /* Treat undef as a match. */
3114 if (c2->type == AC_IR_UNDEF)
3115 continue;
3116
3117 /* If c1 is undef but c2 isn't, we can copy c2 to c1
3118 * and consider the instruction duplicated.
3119 */
3120 if (c1->type == AC_IR_UNDEF) {
3121 copy_back_channels |= 1 << j;
3122 continue;
3123 }
3124
3125 /* Test whether the channels are not equal. */
3126 if (c1->type != c2->type ||
3127 (c1->type == AC_IR_CONST &&
3128 c1->const_float != c2->const_float) ||
3129 (c1->type == AC_IR_VALUE &&
3130 c1->value != c2->value)) {
3131 different = true;
3132 break;
3133 }
3134 }
3135 if (!different)
3136 break;
3137
3138 copy_back_channels = 0;
3139 }
3140 if (p == processed->num)
3141 return false;
3142
3143 /* If a match was found, but the matching export has undef where the new
3144 * one has a normal value, copy the normal value to the undef channel.
3145 */
3146 struct ac_vs_exp_inst *match = &processed->exp[p];
3147
3148 /* Get current enabled channels mask. */
3149 LLVMValueRef arg = LLVMGetOperand(match->inst, AC_EXP_ENABLED_CHANNELS);
3150 unsigned enabled_channels = LLVMConstIntGetZExtValue(arg);
3151
3152 while (copy_back_channels) {
3153 unsigned chan = u_bit_scan(&copy_back_channels);
3154
3155 assert(match->chan[chan].type == AC_IR_UNDEF);
3156 LLVMSetOperand(match->inst, AC_EXP_OUT0 + chan,
3157 exp->chan[chan].value);
3158 match->chan[chan] = exp->chan[chan];
3159
3160 /* Update number of enabled channels because the original mask
3161 * is not always 0xf.
3162 */
3163 enabled_channels |= (1 << chan);
3164 LLVMSetOperand(match->inst, AC_EXP_ENABLED_CHANNELS,
3165 LLVMConstInt(ctx->i32, enabled_channels, 0));
3166 }
3167
3168 /* The PARAM export is duplicated. Kill it. */
3169 LLVMInstructionEraseFromParent(exp->inst);
3170
3171 /* Change OFFSET to the matching export. */
3172 for (unsigned i = 0; i < num_outputs; i++) {
3173 if (vs_output_param_offset[i] == exp->offset) {
3174 vs_output_param_offset[i] = match->offset;
3175 break;
3176 }
3177 }
3178 return true;
3179 }
3180
3181 void ac_optimize_vs_outputs(struct ac_llvm_context *ctx,
3182 LLVMValueRef main_fn,
3183 uint8_t *vs_output_param_offset,
3184 uint32_t num_outputs,
3185 uint8_t *num_param_exports)
3186 {
3187 LLVMBasicBlockRef bb;
3188 bool removed_any = false;
3189 struct ac_vs_exports exports;
3190
3191 exports.num = 0;
3192
3193 /* Process all LLVM instructions. */
3194 bb = LLVMGetFirstBasicBlock(main_fn);
3195 while (bb) {
3196 LLVMValueRef inst = LLVMGetFirstInstruction(bb);
3197
3198 while (inst) {
3199 LLVMValueRef cur = inst;
3200 inst = LLVMGetNextInstruction(inst);
3201 struct ac_vs_exp_inst exp;
3202
3203 if (LLVMGetInstructionOpcode(cur) != LLVMCall)
3204 continue;
3205
3206 LLVMValueRef callee = ac_llvm_get_called_value(cur);
3207
3208 if (!ac_llvm_is_function(callee))
3209 continue;
3210
3211 const char *name = LLVMGetValueName(callee);
3212 unsigned num_args = LLVMCountParams(callee);
3213
3214 /* Check if this is an export instruction. */
3215 if ((num_args != 9 && num_args != 8) ||
3216 (strcmp(name, "llvm.SI.export") &&
3217 strcmp(name, "llvm.amdgcn.exp.f32")))
3218 continue;
3219
3220 LLVMValueRef arg = LLVMGetOperand(cur, AC_EXP_TARGET);
3221 unsigned target = LLVMConstIntGetZExtValue(arg);
3222
3223 if (target < V_008DFC_SQ_EXP_PARAM)
3224 continue;
3225
3226 target -= V_008DFC_SQ_EXP_PARAM;
3227
3228 /* Parse the instruction. */
3229 memset(&exp, 0, sizeof(exp));
3230 exp.offset = target;
3231 exp.inst = cur;
3232
3233 for (unsigned i = 0; i < 4; i++) {
3234 LLVMValueRef v = LLVMGetOperand(cur, AC_EXP_OUT0 + i);
3235
3236 exp.chan[i].value = v;
3237
3238 if (LLVMIsUndef(v)) {
3239 exp.chan[i].type = AC_IR_UNDEF;
3240 } else if (LLVMIsAConstantFP(v)) {
3241 LLVMBool loses_info;
3242 exp.chan[i].type = AC_IR_CONST;
3243 exp.chan[i].const_float =
3244 LLVMConstRealGetDouble(v, &loses_info);
3245 } else {
3246 exp.chan[i].type = AC_IR_VALUE;
3247 }
3248 }
3249
3250 /* Eliminate constant and duplicated PARAM exports. */
3251 if (ac_eliminate_const_output(vs_output_param_offset,
3252 num_outputs, &exp) ||
3253 ac_eliminate_duplicated_output(ctx,
3254 vs_output_param_offset,
3255 num_outputs, &exports,
3256 &exp)) {
3257 removed_any = true;
3258 } else {
3259 exports.exp[exports.num++] = exp;
3260 }
3261 }
3262 bb = LLVMGetNextBasicBlock(bb);
3263 }
3264
3265 /* Remove holes in export memory due to removed PARAM exports.
3266 * This is done by renumbering all PARAM exports.
3267 */
3268 if (removed_any) {
3269 uint8_t old_offset[VARYING_SLOT_MAX];
3270 unsigned out, i;
3271
3272 /* Make a copy of the offsets. We need the old version while
3273 * we are modifying some of them. */
3274 memcpy(old_offset, vs_output_param_offset,
3275 sizeof(old_offset));
3276
3277 for (i = 0; i < exports.num; i++) {
3278 unsigned offset = exports.exp[i].offset;
3279
3280 /* Update vs_output_param_offset. Multiple outputs can
3281 * have the same offset.
3282 */
3283 for (out = 0; out < num_outputs; out++) {
3284 if (old_offset[out] == offset)
3285 vs_output_param_offset[out] = i;
3286 }
3287
3288 /* Change the PARAM offset in the instruction. */
3289 LLVMSetOperand(exports.exp[i].inst, AC_EXP_TARGET,
3290 LLVMConstInt(ctx->i32,
3291 V_008DFC_SQ_EXP_PARAM + i, 0));
3292 }
3293 *num_param_exports = exports.num;
3294 }
3295 }
3296
3297 void ac_init_exec_full_mask(struct ac_llvm_context *ctx)
3298 {
3299 LLVMValueRef full_mask = LLVMConstInt(ctx->i64, ~0ull, 0);
3300 ac_build_intrinsic(ctx,
3301 "llvm.amdgcn.init.exec", ctx->voidt,
3302 &full_mask, 1, AC_FUNC_ATTR_CONVERGENT);
3303 }
3304
3305 void ac_declare_lds_as_pointer(struct ac_llvm_context *ctx)
3306 {
3307 unsigned lds_size = ctx->chip_class >= GFX7 ? 65536 : 32768;
3308 ctx->lds = LLVMBuildIntToPtr(ctx->builder, ctx->i32_0,
3309 LLVMPointerType(LLVMArrayType(ctx->i32, lds_size / 4), AC_ADDR_SPACE_LDS),
3310 "lds");
3311 }
3312
3313 LLVMValueRef ac_lds_load(struct ac_llvm_context *ctx,
3314 LLVMValueRef dw_addr)
3315 {
3316 return LLVMBuildLoad(ctx->builder, ac_build_gep0(ctx, ctx->lds, dw_addr), "");
3317 }
3318
3319 void ac_lds_store(struct ac_llvm_context *ctx,
3320 LLVMValueRef dw_addr,
3321 LLVMValueRef value)
3322 {
3323 value = ac_to_integer(ctx, value);
3324 ac_build_indexed_store(ctx, ctx->lds,
3325 dw_addr, value);
3326 }
3327
3328 LLVMValueRef ac_find_lsb(struct ac_llvm_context *ctx,
3329 LLVMTypeRef dst_type,
3330 LLVMValueRef src0)
3331 {
3332 unsigned src0_bitsize = ac_get_elem_bits(ctx, LLVMTypeOf(src0));
3333 const char *intrin_name;
3334 LLVMTypeRef type;
3335 LLVMValueRef zero;
3336
3337 switch (src0_bitsize) {
3338 case 64:
3339 intrin_name = "llvm.cttz.i64";
3340 type = ctx->i64;
3341 zero = ctx->i64_0;
3342 break;
3343 case 32:
3344 intrin_name = "llvm.cttz.i32";
3345 type = ctx->i32;
3346 zero = ctx->i32_0;
3347 break;
3348 case 16:
3349 intrin_name = "llvm.cttz.i16";
3350 type = ctx->i16;
3351 zero = ctx->i16_0;
3352 break;
3353 case 8:
3354 intrin_name = "llvm.cttz.i8";
3355 type = ctx->i8;
3356 zero = ctx->i8_0;
3357 break;
3358 default:
3359 unreachable(!"invalid bitsize");
3360 }
3361
3362 LLVMValueRef params[2] = {
3363 src0,
3364
3365 /* The value of 1 means that ffs(x=0) = undef, so LLVM won't
3366 * add special code to check for x=0. The reason is that
3367 * the LLVM behavior for x=0 is different from what we
3368 * need here. However, LLVM also assumes that ffs(x) is
3369 * in [0, 31], but GLSL expects that ffs(0) = -1, so
3370 * a conditional assignment to handle 0 is still required.
3371 *
3372 * The hardware already implements the correct behavior.
3373 */
3374 ctx->i1true,
3375 };
3376
3377 LLVMValueRef lsb = ac_build_intrinsic(ctx, intrin_name, type,
3378 params, 2,
3379 AC_FUNC_ATTR_READNONE);
3380
3381 if (src0_bitsize == 64) {
3382 lsb = LLVMBuildTrunc(ctx->builder, lsb, ctx->i32, "");
3383 } else if (src0_bitsize < 32) {
3384 lsb = LLVMBuildSExt(ctx->builder, lsb, ctx->i32, "");
3385 }
3386
3387 /* TODO: We need an intrinsic to skip this conditional. */
3388 /* Check for zero: */
3389 return LLVMBuildSelect(ctx->builder, LLVMBuildICmp(ctx->builder,
3390 LLVMIntEQ, src0,
3391 zero, ""),
3392 LLVMConstInt(ctx->i32, -1, 0), lsb, "");
3393 }
3394
3395 LLVMTypeRef ac_array_in_const_addr_space(LLVMTypeRef elem_type)
3396 {
3397 return LLVMPointerType(elem_type, AC_ADDR_SPACE_CONST);
3398 }
3399
3400 LLVMTypeRef ac_array_in_const32_addr_space(LLVMTypeRef elem_type)
3401 {
3402 return LLVMPointerType(elem_type, AC_ADDR_SPACE_CONST_32BIT);
3403 }
3404
3405 static struct ac_llvm_flow *
3406 get_current_flow(struct ac_llvm_context *ctx)
3407 {
3408 if (ctx->flow_depth > 0)
3409 return &ctx->flow[ctx->flow_depth - 1];
3410 return NULL;
3411 }
3412
3413 static struct ac_llvm_flow *
3414 get_innermost_loop(struct ac_llvm_context *ctx)
3415 {
3416 for (unsigned i = ctx->flow_depth; i > 0; --i) {
3417 if (ctx->flow[i - 1].loop_entry_block)
3418 return &ctx->flow[i - 1];
3419 }
3420 return NULL;
3421 }
3422
3423 static struct ac_llvm_flow *
3424 push_flow(struct ac_llvm_context *ctx)
3425 {
3426 struct ac_llvm_flow *flow;
3427
3428 if (ctx->flow_depth >= ctx->flow_depth_max) {
3429 unsigned new_max = MAX2(ctx->flow_depth << 1,
3430 AC_LLVM_INITIAL_CF_DEPTH);
3431
3432 ctx->flow = realloc(ctx->flow, new_max * sizeof(*ctx->flow));
3433 ctx->flow_depth_max = new_max;
3434 }
3435
3436 flow = &ctx->flow[ctx->flow_depth];
3437 ctx->flow_depth++;
3438
3439 flow->next_block = NULL;
3440 flow->loop_entry_block = NULL;
3441 return flow;
3442 }
3443
3444 static void set_basicblock_name(LLVMBasicBlockRef bb, const char *base,
3445 int label_id)
3446 {
3447 char buf[32];
3448 snprintf(buf, sizeof(buf), "%s%d", base, label_id);
3449 LLVMSetValueName(LLVMBasicBlockAsValue(bb), buf);
3450 }
3451
3452 /* Append a basic block at the level of the parent flow.
3453 */
3454 static LLVMBasicBlockRef append_basic_block(struct ac_llvm_context *ctx,
3455 const char *name)
3456 {
3457 assert(ctx->flow_depth >= 1);
3458
3459 if (ctx->flow_depth >= 2) {
3460 struct ac_llvm_flow *flow = &ctx->flow[ctx->flow_depth - 2];
3461
3462 return LLVMInsertBasicBlockInContext(ctx->context,
3463 flow->next_block, name);
3464 }
3465
3466 LLVMValueRef main_fn =
3467 LLVMGetBasicBlockParent(LLVMGetInsertBlock(ctx->builder));
3468 return LLVMAppendBasicBlockInContext(ctx->context, main_fn, name);
3469 }
3470
3471 /* Emit a branch to the given default target for the current block if
3472 * applicable -- that is, if the current block does not already contain a
3473 * branch from a break or continue.
3474 */
3475 static void emit_default_branch(LLVMBuilderRef builder,
3476 LLVMBasicBlockRef target)
3477 {
3478 if (!LLVMGetBasicBlockTerminator(LLVMGetInsertBlock(builder)))
3479 LLVMBuildBr(builder, target);
3480 }
3481
3482 void ac_build_bgnloop(struct ac_llvm_context *ctx, int label_id)
3483 {
3484 struct ac_llvm_flow *flow = push_flow(ctx);
3485 flow->loop_entry_block = append_basic_block(ctx, "LOOP");
3486 flow->next_block = append_basic_block(ctx, "ENDLOOP");
3487 set_basicblock_name(flow->loop_entry_block, "loop", label_id);
3488 LLVMBuildBr(ctx->builder, flow->loop_entry_block);
3489 LLVMPositionBuilderAtEnd(ctx->builder, flow->loop_entry_block);
3490 }
3491
3492 void ac_build_break(struct ac_llvm_context *ctx)
3493 {
3494 struct ac_llvm_flow *flow = get_innermost_loop(ctx);
3495 LLVMBuildBr(ctx->builder, flow->next_block);
3496 }
3497
3498 void ac_build_continue(struct ac_llvm_context *ctx)
3499 {
3500 struct ac_llvm_flow *flow = get_innermost_loop(ctx);
3501 LLVMBuildBr(ctx->builder, flow->loop_entry_block);
3502 }
3503
3504 void ac_build_else(struct ac_llvm_context *ctx, int label_id)
3505 {
3506 struct ac_llvm_flow *current_branch = get_current_flow(ctx);
3507 LLVMBasicBlockRef endif_block;
3508
3509 assert(!current_branch->loop_entry_block);
3510
3511 endif_block = append_basic_block(ctx, "ENDIF");
3512 emit_default_branch(ctx->builder, endif_block);
3513
3514 LLVMPositionBuilderAtEnd(ctx->builder, current_branch->next_block);
3515 set_basicblock_name(current_branch->next_block, "else", label_id);
3516
3517 current_branch->next_block = endif_block;
3518 }
3519
3520 void ac_build_endif(struct ac_llvm_context *ctx, int label_id)
3521 {
3522 struct ac_llvm_flow *current_branch = get_current_flow(ctx);
3523
3524 assert(!current_branch->loop_entry_block);
3525
3526 emit_default_branch(ctx->builder, current_branch->next_block);
3527 LLVMPositionBuilderAtEnd(ctx->builder, current_branch->next_block);
3528 set_basicblock_name(current_branch->next_block, "endif", label_id);
3529
3530 ctx->flow_depth--;
3531 }
3532
3533 void ac_build_endloop(struct ac_llvm_context *ctx, int label_id)
3534 {
3535 struct ac_llvm_flow *current_loop = get_current_flow(ctx);
3536
3537 assert(current_loop->loop_entry_block);
3538
3539 emit_default_branch(ctx->builder, current_loop->loop_entry_block);
3540
3541 LLVMPositionBuilderAtEnd(ctx->builder, current_loop->next_block);
3542 set_basicblock_name(current_loop->next_block, "endloop", label_id);
3543 ctx->flow_depth--;
3544 }
3545
3546 void ac_build_ifcc(struct ac_llvm_context *ctx, LLVMValueRef cond, int label_id)
3547 {
3548 struct ac_llvm_flow *flow = push_flow(ctx);
3549 LLVMBasicBlockRef if_block;
3550
3551 if_block = append_basic_block(ctx, "IF");
3552 flow->next_block = append_basic_block(ctx, "ELSE");
3553 set_basicblock_name(if_block, "if", label_id);
3554 LLVMBuildCondBr(ctx->builder, cond, if_block, flow->next_block);
3555 LLVMPositionBuilderAtEnd(ctx->builder, if_block);
3556 }
3557
3558 void ac_build_if(struct ac_llvm_context *ctx, LLVMValueRef value,
3559 int label_id)
3560 {
3561 LLVMValueRef cond = LLVMBuildFCmp(ctx->builder, LLVMRealUNE,
3562 value, ctx->f32_0, "");
3563 ac_build_ifcc(ctx, cond, label_id);
3564 }
3565
3566 void ac_build_uif(struct ac_llvm_context *ctx, LLVMValueRef value,
3567 int label_id)
3568 {
3569 LLVMValueRef cond = LLVMBuildICmp(ctx->builder, LLVMIntNE,
3570 ac_to_integer(ctx, value),
3571 ctx->i32_0, "");
3572 ac_build_ifcc(ctx, cond, label_id);
3573 }
3574
3575 LLVMValueRef ac_build_alloca_undef(struct ac_llvm_context *ac, LLVMTypeRef type,
3576 const char *name)
3577 {
3578 LLVMBuilderRef builder = ac->builder;
3579 LLVMBasicBlockRef current_block = LLVMGetInsertBlock(builder);
3580 LLVMValueRef function = LLVMGetBasicBlockParent(current_block);
3581 LLVMBasicBlockRef first_block = LLVMGetEntryBasicBlock(function);
3582 LLVMValueRef first_instr = LLVMGetFirstInstruction(first_block);
3583 LLVMBuilderRef first_builder = LLVMCreateBuilderInContext(ac->context);
3584 LLVMValueRef res;
3585
3586 if (first_instr) {
3587 LLVMPositionBuilderBefore(first_builder, first_instr);
3588 } else {
3589 LLVMPositionBuilderAtEnd(first_builder, first_block);
3590 }
3591
3592 res = LLVMBuildAlloca(first_builder, type, name);
3593 LLVMDisposeBuilder(first_builder);
3594 return res;
3595 }
3596
3597 LLVMValueRef ac_build_alloca(struct ac_llvm_context *ac,
3598 LLVMTypeRef type, const char *name)
3599 {
3600 LLVMValueRef ptr = ac_build_alloca_undef(ac, type, name);
3601 LLVMBuildStore(ac->builder, LLVMConstNull(type), ptr);
3602 return ptr;
3603 }
3604
3605 LLVMValueRef ac_cast_ptr(struct ac_llvm_context *ctx, LLVMValueRef ptr,
3606 LLVMTypeRef type)
3607 {
3608 int addr_space = LLVMGetPointerAddressSpace(LLVMTypeOf(ptr));
3609 return LLVMBuildBitCast(ctx->builder, ptr,
3610 LLVMPointerType(type, addr_space), "");
3611 }
3612
3613 LLVMValueRef ac_trim_vector(struct ac_llvm_context *ctx, LLVMValueRef value,
3614 unsigned count)
3615 {
3616 unsigned num_components = ac_get_llvm_num_components(value);
3617 if (count == num_components)
3618 return value;
3619
3620 LLVMValueRef masks[MAX2(count, 2)];
3621 masks[0] = ctx->i32_0;
3622 masks[1] = ctx->i32_1;
3623 for (unsigned i = 2; i < count; i++)
3624 masks[i] = LLVMConstInt(ctx->i32, i, false);
3625
3626 if (count == 1)
3627 return LLVMBuildExtractElement(ctx->builder, value, masks[0],
3628 "");
3629
3630 LLVMValueRef swizzle = LLVMConstVector(masks, count);
3631 return LLVMBuildShuffleVector(ctx->builder, value, value, swizzle, "");
3632 }
3633
3634 LLVMValueRef ac_unpack_param(struct ac_llvm_context *ctx, LLVMValueRef param,
3635 unsigned rshift, unsigned bitwidth)
3636 {
3637 LLVMValueRef value = param;
3638 if (rshift)
3639 value = LLVMBuildLShr(ctx->builder, value,
3640 LLVMConstInt(ctx->i32, rshift, false), "");
3641
3642 if (rshift + bitwidth < 32) {
3643 unsigned mask = (1 << bitwidth) - 1;
3644 value = LLVMBuildAnd(ctx->builder, value,
3645 LLVMConstInt(ctx->i32, mask, false), "");
3646 }
3647 return value;
3648 }
3649
3650 /* Adjust the sample index according to FMASK.
3651 *
3652 * For uncompressed MSAA surfaces, FMASK should return 0x76543210,
3653 * which is the identity mapping. Each nibble says which physical sample
3654 * should be fetched to get that sample.
3655 *
3656 * For example, 0x11111100 means there are only 2 samples stored and
3657 * the second sample covers 3/4 of the pixel. When reading samples 0
3658 * and 1, return physical sample 0 (determined by the first two 0s
3659 * in FMASK), otherwise return physical sample 1.
3660 *
3661 * The sample index should be adjusted as follows:
3662 * addr[sample_index] = (fmask >> (addr[sample_index] * 4)) & 0xF;
3663 */
3664 void ac_apply_fmask_to_sample(struct ac_llvm_context *ac, LLVMValueRef fmask,
3665 LLVMValueRef *addr, bool is_array_tex)
3666 {
3667 struct ac_image_args fmask_load = {};
3668 fmask_load.opcode = ac_image_load;
3669 fmask_load.resource = fmask;
3670 fmask_load.dmask = 0xf;
3671 fmask_load.dim = is_array_tex ? ac_image_2darray : ac_image_2d;
3672 fmask_load.attributes = AC_FUNC_ATTR_READNONE;
3673
3674 fmask_load.coords[0] = addr[0];
3675 fmask_load.coords[1] = addr[1];
3676 if (is_array_tex)
3677 fmask_load.coords[2] = addr[2];
3678
3679 LLVMValueRef fmask_value = ac_build_image_opcode(ac, &fmask_load);
3680 fmask_value = LLVMBuildExtractElement(ac->builder, fmask_value,
3681 ac->i32_0, "");
3682
3683 /* Apply the formula. */
3684 unsigned sample_chan = is_array_tex ? 3 : 2;
3685 LLVMValueRef final_sample;
3686 final_sample = LLVMBuildMul(ac->builder, addr[sample_chan],
3687 LLVMConstInt(ac->i32, 4, 0), "");
3688 final_sample = LLVMBuildLShr(ac->builder, fmask_value, final_sample, "");
3689 /* Mask the sample index by 0x7, because 0x8 means an unknown value
3690 * with EQAA, so those will map to 0. */
3691 final_sample = LLVMBuildAnd(ac->builder, final_sample,
3692 LLVMConstInt(ac->i32, 0x7, 0), "");
3693
3694 /* Don't rewrite the sample index if WORD1.DATA_FORMAT of the FMASK
3695 * resource descriptor is 0 (invalid).
3696 */
3697 LLVMValueRef tmp;
3698 tmp = LLVMBuildBitCast(ac->builder, fmask, ac->v8i32, "");
3699 tmp = LLVMBuildExtractElement(ac->builder, tmp, ac->i32_1, "");
3700 tmp = LLVMBuildICmp(ac->builder, LLVMIntNE, tmp, ac->i32_0, "");
3701
3702 /* Replace the MSAA sample index. */
3703 addr[sample_chan] = LLVMBuildSelect(ac->builder, tmp, final_sample,
3704 addr[sample_chan], "");
3705 }
3706
3707 static LLVMValueRef
3708 _ac_build_readlane(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef lane)
3709 {
3710 ac_build_optimization_barrier(ctx, &src);
3711 return ac_build_intrinsic(ctx,
3712 lane == NULL ? "llvm.amdgcn.readfirstlane" : "llvm.amdgcn.readlane",
3713 LLVMTypeOf(src), (LLVMValueRef []) {
3714 src, lane },
3715 lane == NULL ? 1 : 2,
3716 AC_FUNC_ATTR_READNONE |
3717 AC_FUNC_ATTR_CONVERGENT);
3718 }
3719
3720 /**
3721 * Builds the "llvm.amdgcn.readlane" or "llvm.amdgcn.readfirstlane" intrinsic.
3722 * @param ctx
3723 * @param src
3724 * @param lane - id of the lane or NULL for the first active lane
3725 * @return value of the lane
3726 */
3727 LLVMValueRef
3728 ac_build_readlane(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef lane)
3729 {
3730 LLVMTypeRef src_type = LLVMTypeOf(src);
3731 src = ac_to_integer(ctx, src);
3732 unsigned bits = LLVMGetIntTypeWidth(LLVMTypeOf(src));
3733 LLVMValueRef ret;
3734
3735 if (bits == 32) {
3736 ret = _ac_build_readlane(ctx, src, lane);
3737 } else {
3738 assert(bits % 32 == 0);
3739 LLVMTypeRef vec_type = LLVMVectorType(ctx->i32, bits / 32);
3740 LLVMValueRef src_vector =
3741 LLVMBuildBitCast(ctx->builder, src, vec_type, "");
3742 ret = LLVMGetUndef(vec_type);
3743 for (unsigned i = 0; i < bits / 32; i++) {
3744 src = LLVMBuildExtractElement(ctx->builder, src_vector,
3745 LLVMConstInt(ctx->i32, i, 0), "");
3746 LLVMValueRef ret_comp = _ac_build_readlane(ctx, src, lane);
3747 ret = LLVMBuildInsertElement(ctx->builder, ret, ret_comp,
3748 LLVMConstInt(ctx->i32, i, 0), "");
3749 }
3750 }
3751 return LLVMBuildBitCast(ctx->builder, ret, src_type, "");
3752 }
3753
3754 LLVMValueRef
3755 ac_build_writelane(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef value, LLVMValueRef lane)
3756 {
3757 /* TODO: Use the actual instruction when LLVM adds an intrinsic for it.
3758 */
3759 LLVMValueRef pred = LLVMBuildICmp(ctx->builder, LLVMIntEQ, lane,
3760 ac_get_thread_id(ctx), "");
3761 return LLVMBuildSelect(ctx->builder, pred, value, src, "");
3762 }
3763
3764 LLVMValueRef
3765 ac_build_mbcnt(struct ac_llvm_context *ctx, LLVMValueRef mask)
3766 {
3767 LLVMValueRef mask_vec = LLVMBuildBitCast(ctx->builder, mask,
3768 LLVMVectorType(ctx->i32, 2),
3769 "");
3770 LLVMValueRef mask_lo = LLVMBuildExtractElement(ctx->builder, mask_vec,
3771 ctx->i32_0, "");
3772 LLVMValueRef mask_hi = LLVMBuildExtractElement(ctx->builder, mask_vec,
3773 ctx->i32_1, "");
3774 LLVMValueRef val =
3775 ac_build_intrinsic(ctx, "llvm.amdgcn.mbcnt.lo", ctx->i32,
3776 (LLVMValueRef []) { mask_lo, ctx->i32_0 },
3777 2, AC_FUNC_ATTR_READNONE);
3778 val = ac_build_intrinsic(ctx, "llvm.amdgcn.mbcnt.hi", ctx->i32,
3779 (LLVMValueRef []) { mask_hi, val },
3780 2, AC_FUNC_ATTR_READNONE);
3781 return val;
3782 }
3783
3784 enum dpp_ctrl {
3785 _dpp_quad_perm = 0x000,
3786 _dpp_row_sl = 0x100,
3787 _dpp_row_sr = 0x110,
3788 _dpp_row_rr = 0x120,
3789 dpp_wf_sl1 = 0x130,
3790 dpp_wf_rl1 = 0x134,
3791 dpp_wf_sr1 = 0x138,
3792 dpp_wf_rr1 = 0x13C,
3793 dpp_row_mirror = 0x140,
3794 dpp_row_half_mirror = 0x141,
3795 dpp_row_bcast15 = 0x142,
3796 dpp_row_bcast31 = 0x143
3797 };
3798
3799 static inline enum dpp_ctrl
3800 dpp_quad_perm(unsigned lane0, unsigned lane1, unsigned lane2, unsigned lane3)
3801 {
3802 assert(lane0 < 4 && lane1 < 4 && lane2 < 4 && lane3 < 4);
3803 return _dpp_quad_perm | lane0 | (lane1 << 2) | (lane2 << 4) | (lane3 << 6);
3804 }
3805
3806 static inline enum dpp_ctrl
3807 dpp_row_sl(unsigned amount)
3808 {
3809 assert(amount > 0 && amount < 16);
3810 return _dpp_row_sl | amount;
3811 }
3812
3813 static inline enum dpp_ctrl
3814 dpp_row_sr(unsigned amount)
3815 {
3816 assert(amount > 0 && amount < 16);
3817 return _dpp_row_sr | amount;
3818 }
3819
3820 static LLVMValueRef
3821 _ac_build_dpp(struct ac_llvm_context *ctx, LLVMValueRef old, LLVMValueRef src,
3822 enum dpp_ctrl dpp_ctrl, unsigned row_mask, unsigned bank_mask,
3823 bool bound_ctrl)
3824 {
3825 return ac_build_intrinsic(ctx, "llvm.amdgcn.update.dpp.i32",
3826 LLVMTypeOf(old),
3827 (LLVMValueRef[]) {
3828 old, src,
3829 LLVMConstInt(ctx->i32, dpp_ctrl, 0),
3830 LLVMConstInt(ctx->i32, row_mask, 0),
3831 LLVMConstInt(ctx->i32, bank_mask, 0),
3832 LLVMConstInt(ctx->i1, bound_ctrl, 0) },
3833 6, AC_FUNC_ATTR_READNONE | AC_FUNC_ATTR_CONVERGENT);
3834 }
3835
3836 static LLVMValueRef
3837 ac_build_dpp(struct ac_llvm_context *ctx, LLVMValueRef old, LLVMValueRef src,
3838 enum dpp_ctrl dpp_ctrl, unsigned row_mask, unsigned bank_mask,
3839 bool bound_ctrl)
3840 {
3841 LLVMTypeRef src_type = LLVMTypeOf(src);
3842 src = ac_to_integer(ctx, src);
3843 old = ac_to_integer(ctx, old);
3844 unsigned bits = LLVMGetIntTypeWidth(LLVMTypeOf(src));
3845 LLVMValueRef ret;
3846 if (bits == 32) {
3847 ret = _ac_build_dpp(ctx, old, src, dpp_ctrl, row_mask,
3848 bank_mask, bound_ctrl);
3849 } else {
3850 assert(bits % 32 == 0);
3851 LLVMTypeRef vec_type = LLVMVectorType(ctx->i32, bits / 32);
3852 LLVMValueRef src_vector =
3853 LLVMBuildBitCast(ctx->builder, src, vec_type, "");
3854 LLVMValueRef old_vector =
3855 LLVMBuildBitCast(ctx->builder, old, vec_type, "");
3856 ret = LLVMGetUndef(vec_type);
3857 for (unsigned i = 0; i < bits / 32; i++) {
3858 src = LLVMBuildExtractElement(ctx->builder, src_vector,
3859 LLVMConstInt(ctx->i32, i,
3860 0), "");
3861 old = LLVMBuildExtractElement(ctx->builder, old_vector,
3862 LLVMConstInt(ctx->i32, i,
3863 0), "");
3864 LLVMValueRef ret_comp = _ac_build_dpp(ctx, old, src,
3865 dpp_ctrl,
3866 row_mask,
3867 bank_mask,
3868 bound_ctrl);
3869 ret = LLVMBuildInsertElement(ctx->builder, ret,
3870 ret_comp,
3871 LLVMConstInt(ctx->i32, i,
3872 0), "");
3873 }
3874 }
3875 return LLVMBuildBitCast(ctx->builder, ret, src_type, "");
3876 }
3877
3878 static inline unsigned
3879 ds_pattern_bitmode(unsigned and_mask, unsigned or_mask, unsigned xor_mask)
3880 {
3881 assert(and_mask < 32 && or_mask < 32 && xor_mask < 32);
3882 return and_mask | (or_mask << 5) | (xor_mask << 10);
3883 }
3884
3885 static LLVMValueRef
3886 _ac_build_ds_swizzle(struct ac_llvm_context *ctx, LLVMValueRef src, unsigned mask)
3887 {
3888 return ac_build_intrinsic(ctx, "llvm.amdgcn.ds.swizzle",
3889 LLVMTypeOf(src), (LLVMValueRef []) {
3890 src, LLVMConstInt(ctx->i32, mask, 0) },
3891 2, AC_FUNC_ATTR_READNONE | AC_FUNC_ATTR_CONVERGENT);
3892 }
3893
3894 LLVMValueRef
3895 ac_build_ds_swizzle(struct ac_llvm_context *ctx, LLVMValueRef src, unsigned mask)
3896 {
3897 LLVMTypeRef src_type = LLVMTypeOf(src);
3898 src = ac_to_integer(ctx, src);
3899 unsigned bits = LLVMGetIntTypeWidth(LLVMTypeOf(src));
3900 LLVMValueRef ret;
3901 if (bits == 32) {
3902 ret = _ac_build_ds_swizzle(ctx, src, mask);
3903 } else {
3904 assert(bits % 32 == 0);
3905 LLVMTypeRef vec_type = LLVMVectorType(ctx->i32, bits / 32);
3906 LLVMValueRef src_vector =
3907 LLVMBuildBitCast(ctx->builder, src, vec_type, "");
3908 ret = LLVMGetUndef(vec_type);
3909 for (unsigned i = 0; i < bits / 32; i++) {
3910 src = LLVMBuildExtractElement(ctx->builder, src_vector,
3911 LLVMConstInt(ctx->i32, i,
3912 0), "");
3913 LLVMValueRef ret_comp = _ac_build_ds_swizzle(ctx, src,
3914 mask);
3915 ret = LLVMBuildInsertElement(ctx->builder, ret,
3916 ret_comp,
3917 LLVMConstInt(ctx->i32, i,
3918 0), "");
3919 }
3920 }
3921 return LLVMBuildBitCast(ctx->builder, ret, src_type, "");
3922 }
3923
3924 static LLVMValueRef
3925 ac_build_wwm(struct ac_llvm_context *ctx, LLVMValueRef src)
3926 {
3927 char name[32], type[8];
3928 ac_build_type_name_for_intr(LLVMTypeOf(src), type, sizeof(type));
3929 snprintf(name, sizeof(name), "llvm.amdgcn.wwm.%s", type);
3930 return ac_build_intrinsic(ctx, name, LLVMTypeOf(src),
3931 (LLVMValueRef []) { src }, 1,
3932 AC_FUNC_ATTR_READNONE);
3933 }
3934
3935 static LLVMValueRef
3936 ac_build_set_inactive(struct ac_llvm_context *ctx, LLVMValueRef src,
3937 LLVMValueRef inactive)
3938 {
3939 char name[33], type[8];
3940 LLVMTypeRef src_type = LLVMTypeOf(src);
3941 src = ac_to_integer(ctx, src);
3942 inactive = ac_to_integer(ctx, inactive);
3943 ac_build_type_name_for_intr(LLVMTypeOf(src), type, sizeof(type));
3944 snprintf(name, sizeof(name), "llvm.amdgcn.set.inactive.%s", type);
3945 LLVMValueRef ret =
3946 ac_build_intrinsic(ctx, name,
3947 LLVMTypeOf(src), (LLVMValueRef []) {
3948 src, inactive }, 2,
3949 AC_FUNC_ATTR_READNONE |
3950 AC_FUNC_ATTR_CONVERGENT);
3951 return LLVMBuildBitCast(ctx->builder, ret, src_type, "");
3952 }
3953
3954 static LLVMValueRef
3955 get_reduction_identity(struct ac_llvm_context *ctx, nir_op op, unsigned type_size)
3956 {
3957 if (type_size == 4) {
3958 switch (op) {
3959 case nir_op_iadd: return ctx->i32_0;
3960 case nir_op_fadd: return ctx->f32_0;
3961 case nir_op_imul: return ctx->i32_1;
3962 case nir_op_fmul: return ctx->f32_1;
3963 case nir_op_imin: return LLVMConstInt(ctx->i32, INT32_MAX, 0);
3964 case nir_op_umin: return LLVMConstInt(ctx->i32, UINT32_MAX, 0);
3965 case nir_op_fmin: return LLVMConstReal(ctx->f32, INFINITY);
3966 case nir_op_imax: return LLVMConstInt(ctx->i32, INT32_MIN, 0);
3967 case nir_op_umax: return ctx->i32_0;
3968 case nir_op_fmax: return LLVMConstReal(ctx->f32, -INFINITY);
3969 case nir_op_iand: return LLVMConstInt(ctx->i32, -1, 0);
3970 case nir_op_ior: return ctx->i32_0;
3971 case nir_op_ixor: return ctx->i32_0;
3972 default:
3973 unreachable("bad reduction intrinsic");
3974 }
3975 } else { /* type_size == 64bit */
3976 switch (op) {
3977 case nir_op_iadd: return ctx->i64_0;
3978 case nir_op_fadd: return ctx->f64_0;
3979 case nir_op_imul: return ctx->i64_1;
3980 case nir_op_fmul: return ctx->f64_1;
3981 case nir_op_imin: return LLVMConstInt(ctx->i64, INT64_MAX, 0);
3982 case nir_op_umin: return LLVMConstInt(ctx->i64, UINT64_MAX, 0);
3983 case nir_op_fmin: return LLVMConstReal(ctx->f64, INFINITY);
3984 case nir_op_imax: return LLVMConstInt(ctx->i64, INT64_MIN, 0);
3985 case nir_op_umax: return ctx->i64_0;
3986 case nir_op_fmax: return LLVMConstReal(ctx->f64, -INFINITY);
3987 case nir_op_iand: return LLVMConstInt(ctx->i64, -1, 0);
3988 case nir_op_ior: return ctx->i64_0;
3989 case nir_op_ixor: return ctx->i64_0;
3990 default:
3991 unreachable("bad reduction intrinsic");
3992 }
3993 }
3994 }
3995
3996 static LLVMValueRef
3997 ac_build_alu_op(struct ac_llvm_context *ctx, LLVMValueRef lhs, LLVMValueRef rhs, nir_op op)
3998 {
3999 bool _64bit = ac_get_type_size(LLVMTypeOf(lhs)) == 8;
4000 switch (op) {
4001 case nir_op_iadd: return LLVMBuildAdd(ctx->builder, lhs, rhs, "");
4002 case nir_op_fadd: return LLVMBuildFAdd(ctx->builder, lhs, rhs, "");
4003 case nir_op_imul: return LLVMBuildMul(ctx->builder, lhs, rhs, "");
4004 case nir_op_fmul: return LLVMBuildFMul(ctx->builder, lhs, rhs, "");
4005 case nir_op_imin: return LLVMBuildSelect(ctx->builder,
4006 LLVMBuildICmp(ctx->builder, LLVMIntSLT, lhs, rhs, ""),
4007 lhs, rhs, "");
4008 case nir_op_umin: return LLVMBuildSelect(ctx->builder,
4009 LLVMBuildICmp(ctx->builder, LLVMIntULT, lhs, rhs, ""),
4010 lhs, rhs, "");
4011 case nir_op_fmin: return ac_build_intrinsic(ctx,
4012 _64bit ? "llvm.minnum.f64" : "llvm.minnum.f32",
4013 _64bit ? ctx->f64 : ctx->f32,
4014 (LLVMValueRef[]){lhs, rhs}, 2, AC_FUNC_ATTR_READNONE);
4015 case nir_op_imax: return LLVMBuildSelect(ctx->builder,
4016 LLVMBuildICmp(ctx->builder, LLVMIntSGT, lhs, rhs, ""),
4017 lhs, rhs, "");
4018 case nir_op_umax: return LLVMBuildSelect(ctx->builder,
4019 LLVMBuildICmp(ctx->builder, LLVMIntUGT, lhs, rhs, ""),
4020 lhs, rhs, "");
4021 case nir_op_fmax: return ac_build_intrinsic(ctx,
4022 _64bit ? "llvm.maxnum.f64" : "llvm.maxnum.f32",
4023 _64bit ? ctx->f64 : ctx->f32,
4024 (LLVMValueRef[]){lhs, rhs}, 2, AC_FUNC_ATTR_READNONE);
4025 case nir_op_iand: return LLVMBuildAnd(ctx->builder, lhs, rhs, "");
4026 case nir_op_ior: return LLVMBuildOr(ctx->builder, lhs, rhs, "");
4027 case nir_op_ixor: return LLVMBuildXor(ctx->builder, lhs, rhs, "");
4028 default:
4029 unreachable("bad reduction intrinsic");
4030 }
4031 }
4032
4033 /**
4034 * \param maxprefix specifies that the result only needs to be correct for a
4035 * prefix of this many threads
4036 *
4037 * TODO: add inclusive and excluse scan functions for GFX6.
4038 */
4039 static LLVMValueRef
4040 ac_build_scan(struct ac_llvm_context *ctx, nir_op op, LLVMValueRef src, LLVMValueRef identity,
4041 unsigned maxprefix)
4042 {
4043 LLVMValueRef result, tmp;
4044 result = src;
4045 if (maxprefix <= 1)
4046 return result;
4047 tmp = ac_build_dpp(ctx, identity, src, dpp_row_sr(1), 0xf, 0xf, false);
4048 result = ac_build_alu_op(ctx, result, tmp, op);
4049 if (maxprefix <= 2)
4050 return result;
4051 tmp = ac_build_dpp(ctx, identity, src, dpp_row_sr(2), 0xf, 0xf, false);
4052 result = ac_build_alu_op(ctx, result, tmp, op);
4053 if (maxprefix <= 3)
4054 return result;
4055 tmp = ac_build_dpp(ctx, identity, src, dpp_row_sr(3), 0xf, 0xf, false);
4056 result = ac_build_alu_op(ctx, result, tmp, op);
4057 if (maxprefix <= 4)
4058 return result;
4059 tmp = ac_build_dpp(ctx, identity, result, dpp_row_sr(4), 0xf, 0xe, false);
4060 result = ac_build_alu_op(ctx, result, tmp, op);
4061 if (maxprefix <= 8)
4062 return result;
4063 tmp = ac_build_dpp(ctx, identity, result, dpp_row_sr(8), 0xf, 0xc, false);
4064 result = ac_build_alu_op(ctx, result, tmp, op);
4065 if (maxprefix <= 16)
4066 return result;
4067 tmp = ac_build_dpp(ctx, identity, result, dpp_row_bcast15, 0xa, 0xf, false);
4068 result = ac_build_alu_op(ctx, result, tmp, op);
4069 if (maxprefix <= 32)
4070 return result;
4071 tmp = ac_build_dpp(ctx, identity, result, dpp_row_bcast31, 0xc, 0xf, false);
4072 result = ac_build_alu_op(ctx, result, tmp, op);
4073 return result;
4074 }
4075
4076 LLVMValueRef
4077 ac_build_inclusive_scan(struct ac_llvm_context *ctx, LLVMValueRef src, nir_op op)
4078 {
4079 LLVMValueRef result;
4080
4081 if (LLVMTypeOf(src) == ctx->i1 && op == nir_op_iadd) {
4082 LLVMBuilderRef builder = ctx->builder;
4083 src = LLVMBuildZExt(builder, src, ctx->i32, "");
4084 result = ac_build_ballot(ctx, src);
4085 result = ac_build_mbcnt(ctx, result);
4086 result = LLVMBuildAdd(builder, result, src, "");
4087 return result;
4088 }
4089
4090 ac_build_optimization_barrier(ctx, &src);
4091
4092 LLVMValueRef identity =
4093 get_reduction_identity(ctx, op, ac_get_type_size(LLVMTypeOf(src)));
4094 result = LLVMBuildBitCast(ctx->builder, ac_build_set_inactive(ctx, src, identity),
4095 LLVMTypeOf(identity), "");
4096 result = ac_build_scan(ctx, op, result, identity, 64);
4097
4098 return ac_build_wwm(ctx, result);
4099 }
4100
4101 LLVMValueRef
4102 ac_build_exclusive_scan(struct ac_llvm_context *ctx, LLVMValueRef src, nir_op op)
4103 {
4104 LLVMValueRef result;
4105
4106 if (LLVMTypeOf(src) == ctx->i1 && op == nir_op_iadd) {
4107 LLVMBuilderRef builder = ctx->builder;
4108 src = LLVMBuildZExt(builder, src, ctx->i32, "");
4109 result = ac_build_ballot(ctx, src);
4110 result = ac_build_mbcnt(ctx, result);
4111 return result;
4112 }
4113
4114 ac_build_optimization_barrier(ctx, &src);
4115
4116 LLVMValueRef identity =
4117 get_reduction_identity(ctx, op, ac_get_type_size(LLVMTypeOf(src)));
4118 result = LLVMBuildBitCast(ctx->builder, ac_build_set_inactive(ctx, src, identity),
4119 LLVMTypeOf(identity), "");
4120 result = ac_build_dpp(ctx, identity, result, dpp_wf_sr1, 0xf, 0xf, false);
4121 result = ac_build_scan(ctx, op, result, identity, 64);
4122
4123 return ac_build_wwm(ctx, result);
4124 }
4125
4126 LLVMValueRef
4127 ac_build_reduce(struct ac_llvm_context *ctx, LLVMValueRef src, nir_op op, unsigned cluster_size)
4128 {
4129 if (cluster_size == 1) return src;
4130 ac_build_optimization_barrier(ctx, &src);
4131 LLVMValueRef result, swap;
4132 LLVMValueRef identity = get_reduction_identity(ctx, op,
4133 ac_get_type_size(LLVMTypeOf(src)));
4134 result = LLVMBuildBitCast(ctx->builder,
4135 ac_build_set_inactive(ctx, src, identity),
4136 LLVMTypeOf(identity), "");
4137 swap = ac_build_quad_swizzle(ctx, result, 1, 0, 3, 2);
4138 result = ac_build_alu_op(ctx, result, swap, op);
4139 if (cluster_size == 2) return ac_build_wwm(ctx, result);
4140
4141 swap = ac_build_quad_swizzle(ctx, result, 2, 3, 0, 1);
4142 result = ac_build_alu_op(ctx, result, swap, op);
4143 if (cluster_size == 4) return ac_build_wwm(ctx, result);
4144
4145 if (ctx->chip_class >= GFX8)
4146 swap = ac_build_dpp(ctx, identity, result, dpp_row_half_mirror, 0xf, 0xf, false);
4147 else
4148 swap = ac_build_ds_swizzle(ctx, result, ds_pattern_bitmode(0x1f, 0, 0x04));
4149 result = ac_build_alu_op(ctx, result, swap, op);
4150 if (cluster_size == 8) return ac_build_wwm(ctx, result);
4151
4152 if (ctx->chip_class >= GFX8)
4153 swap = ac_build_dpp(ctx, identity, result, dpp_row_mirror, 0xf, 0xf, false);
4154 else
4155 swap = ac_build_ds_swizzle(ctx, result, ds_pattern_bitmode(0x1f, 0, 0x08));
4156 result = ac_build_alu_op(ctx, result, swap, op);
4157 if (cluster_size == 16) return ac_build_wwm(ctx, result);
4158
4159 if (ctx->chip_class >= GFX8 && cluster_size != 32)
4160 swap = ac_build_dpp(ctx, identity, result, dpp_row_bcast15, 0xa, 0xf, false);
4161 else
4162 swap = ac_build_ds_swizzle(ctx, result, ds_pattern_bitmode(0x1f, 0, 0x10));
4163 result = ac_build_alu_op(ctx, result, swap, op);
4164 if (cluster_size == 32) return ac_build_wwm(ctx, result);
4165
4166 if (ctx->chip_class >= GFX8) {
4167 swap = ac_build_dpp(ctx, identity, result, dpp_row_bcast31, 0xc, 0xf, false);
4168 result = ac_build_alu_op(ctx, result, swap, op);
4169 result = ac_build_readlane(ctx, result, LLVMConstInt(ctx->i32, 63, 0));
4170 return ac_build_wwm(ctx, result);
4171 } else {
4172 swap = ac_build_readlane(ctx, result, ctx->i32_0);
4173 result = ac_build_readlane(ctx, result, LLVMConstInt(ctx->i32, 32, 0));
4174 result = ac_build_alu_op(ctx, result, swap, op);
4175 return ac_build_wwm(ctx, result);
4176 }
4177 }
4178
4179 /**
4180 * "Top half" of a scan that reduces per-wave values across an entire
4181 * workgroup.
4182 *
4183 * The source value must be present in the highest lane of the wave, and the
4184 * highest lane must be live.
4185 */
4186 void
4187 ac_build_wg_wavescan_top(struct ac_llvm_context *ctx, struct ac_wg_scan *ws)
4188 {
4189 if (ws->maxwaves <= 1)
4190 return;
4191
4192 const LLVMValueRef i32_63 = LLVMConstInt(ctx->i32, 63, false);
4193 LLVMBuilderRef builder = ctx->builder;
4194 LLVMValueRef tid = ac_get_thread_id(ctx);
4195 LLVMValueRef tmp;
4196
4197 tmp = LLVMBuildICmp(builder, LLVMIntEQ, tid, i32_63, "");
4198 ac_build_ifcc(ctx, tmp, 1000);
4199 LLVMBuildStore(builder, ws->src, LLVMBuildGEP(builder, ws->scratch, &ws->waveidx, 1, ""));
4200 ac_build_endif(ctx, 1000);
4201 }
4202
4203 /**
4204 * "Bottom half" of a scan that reduces per-wave values across an entire
4205 * workgroup.
4206 *
4207 * The caller must place a barrier between the top and bottom halves.
4208 */
4209 void
4210 ac_build_wg_wavescan_bottom(struct ac_llvm_context *ctx, struct ac_wg_scan *ws)
4211 {
4212 const LLVMTypeRef type = LLVMTypeOf(ws->src);
4213 const LLVMValueRef identity =
4214 get_reduction_identity(ctx, ws->op, ac_get_type_size(type));
4215
4216 if (ws->maxwaves <= 1) {
4217 ws->result_reduce = ws->src;
4218 ws->result_inclusive = ws->src;
4219 ws->result_exclusive = identity;
4220 return;
4221 }
4222 assert(ws->maxwaves <= 32);
4223
4224 LLVMBuilderRef builder = ctx->builder;
4225 LLVMValueRef tid = ac_get_thread_id(ctx);
4226 LLVMBasicBlockRef bbs[2];
4227 LLVMValueRef phivalues_scan[2];
4228 LLVMValueRef tmp, tmp2;
4229
4230 bbs[0] = LLVMGetInsertBlock(builder);
4231 phivalues_scan[0] = LLVMGetUndef(type);
4232
4233 if (ws->enable_reduce)
4234 tmp = LLVMBuildICmp(builder, LLVMIntULT, tid, ws->numwaves, "");
4235 else if (ws->enable_inclusive)
4236 tmp = LLVMBuildICmp(builder, LLVMIntULE, tid, ws->waveidx, "");
4237 else
4238 tmp = LLVMBuildICmp(builder, LLVMIntULT, tid, ws->waveidx, "");
4239 ac_build_ifcc(ctx, tmp, 1001);
4240 {
4241 tmp = LLVMBuildLoad(builder, LLVMBuildGEP(builder, ws->scratch, &tid, 1, ""), "");
4242
4243 ac_build_optimization_barrier(ctx, &tmp);
4244
4245 bbs[1] = LLVMGetInsertBlock(builder);
4246 phivalues_scan[1] = ac_build_scan(ctx, ws->op, tmp, identity, ws->maxwaves);
4247 }
4248 ac_build_endif(ctx, 1001);
4249
4250 const LLVMValueRef scan = ac_build_phi(ctx, type, 2, phivalues_scan, bbs);
4251
4252 if (ws->enable_reduce) {
4253 tmp = LLVMBuildSub(builder, ws->numwaves, ctx->i32_1, "");
4254 ws->result_reduce = ac_build_readlane(ctx, scan, tmp);
4255 }
4256 if (ws->enable_inclusive)
4257 ws->result_inclusive = ac_build_readlane(ctx, scan, ws->waveidx);
4258 if (ws->enable_exclusive) {
4259 tmp = LLVMBuildSub(builder, ws->waveidx, ctx->i32_1, "");
4260 tmp = ac_build_readlane(ctx, scan, tmp);
4261 tmp2 = LLVMBuildICmp(builder, LLVMIntEQ, ws->waveidx, ctx->i32_0, "");
4262 ws->result_exclusive = LLVMBuildSelect(builder, tmp2, identity, tmp, "");
4263 }
4264 }
4265
4266 /**
4267 * Inclusive scan of a per-wave value across an entire workgroup.
4268 *
4269 * This implies an s_barrier instruction.
4270 *
4271 * Unlike ac_build_inclusive_scan, the caller \em must ensure that all threads
4272 * of the workgroup are live. (This requirement cannot easily be relaxed in a
4273 * useful manner because of the barrier in the algorithm.)
4274 */
4275 void
4276 ac_build_wg_wavescan(struct ac_llvm_context *ctx, struct ac_wg_scan *ws)
4277 {
4278 ac_build_wg_wavescan_top(ctx, ws);
4279 ac_build_s_barrier(ctx);
4280 ac_build_wg_wavescan_bottom(ctx, ws);
4281 }
4282
4283 /**
4284 * "Top half" of a scan that reduces per-thread values across an entire
4285 * workgroup.
4286 *
4287 * All lanes must be active when this code runs.
4288 */
4289 void
4290 ac_build_wg_scan_top(struct ac_llvm_context *ctx, struct ac_wg_scan *ws)
4291 {
4292 if (ws->enable_exclusive) {
4293 ws->extra = ac_build_exclusive_scan(ctx, ws->src, ws->op);
4294 if (LLVMTypeOf(ws->src) == ctx->i1 && ws->op == nir_op_iadd)
4295 ws->src = LLVMBuildZExt(ctx->builder, ws->src, ctx->i32, "");
4296 ws->src = ac_build_alu_op(ctx, ws->extra, ws->src, ws->op);
4297 } else {
4298 ws->src = ac_build_inclusive_scan(ctx, ws->src, ws->op);
4299 }
4300
4301 bool enable_inclusive = ws->enable_inclusive;
4302 bool enable_exclusive = ws->enable_exclusive;
4303 ws->enable_inclusive = false;
4304 ws->enable_exclusive = ws->enable_exclusive || enable_inclusive;
4305 ac_build_wg_wavescan_top(ctx, ws);
4306 ws->enable_inclusive = enable_inclusive;
4307 ws->enable_exclusive = enable_exclusive;
4308 }
4309
4310 /**
4311 * "Bottom half" of a scan that reduces per-thread values across an entire
4312 * workgroup.
4313 *
4314 * The caller must place a barrier between the top and bottom halves.
4315 */
4316 void
4317 ac_build_wg_scan_bottom(struct ac_llvm_context *ctx, struct ac_wg_scan *ws)
4318 {
4319 bool enable_inclusive = ws->enable_inclusive;
4320 bool enable_exclusive = ws->enable_exclusive;
4321 ws->enable_inclusive = false;
4322 ws->enable_exclusive = ws->enable_exclusive || enable_inclusive;
4323 ac_build_wg_wavescan_bottom(ctx, ws);
4324 ws->enable_inclusive = enable_inclusive;
4325 ws->enable_exclusive = enable_exclusive;
4326
4327 /* ws->result_reduce is already the correct value */
4328 if (ws->enable_inclusive)
4329 ws->result_inclusive = ac_build_alu_op(ctx, ws->result_exclusive, ws->src, ws->op);
4330 if (ws->enable_exclusive)
4331 ws->result_exclusive = ac_build_alu_op(ctx, ws->result_exclusive, ws->extra, ws->op);
4332 }
4333
4334 /**
4335 * A scan that reduces per-thread values across an entire workgroup.
4336 *
4337 * The caller must ensure that all lanes are active when this code runs
4338 * (WWM is insufficient!), because there is an implied barrier.
4339 */
4340 void
4341 ac_build_wg_scan(struct ac_llvm_context *ctx, struct ac_wg_scan *ws)
4342 {
4343 ac_build_wg_scan_top(ctx, ws);
4344 ac_build_s_barrier(ctx);
4345 ac_build_wg_scan_bottom(ctx, ws);
4346 }
4347
4348 LLVMValueRef
4349 ac_build_quad_swizzle(struct ac_llvm_context *ctx, LLVMValueRef src,
4350 unsigned lane0, unsigned lane1, unsigned lane2, unsigned lane3)
4351 {
4352 unsigned mask = dpp_quad_perm(lane0, lane1, lane2, lane3);
4353 if (ctx->chip_class >= GFX8) {
4354 return ac_build_dpp(ctx, src, src, mask, 0xf, 0xf, false);
4355 } else {
4356 return ac_build_ds_swizzle(ctx, src, (1 << 15) | mask);
4357 }
4358 }
4359
4360 LLVMValueRef
4361 ac_build_shuffle(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef index)
4362 {
4363 index = LLVMBuildMul(ctx->builder, index, LLVMConstInt(ctx->i32, 4, 0), "");
4364 return ac_build_intrinsic(ctx,
4365 "llvm.amdgcn.ds.bpermute", ctx->i32,
4366 (LLVMValueRef []) {index, src}, 2,
4367 AC_FUNC_ATTR_READNONE |
4368 AC_FUNC_ATTR_CONVERGENT);
4369 }
4370
4371 LLVMValueRef
4372 ac_build_frexp_exp(struct ac_llvm_context *ctx, LLVMValueRef src0,
4373 unsigned bitsize)
4374 {
4375 LLVMTypeRef type;
4376 char *intr;
4377
4378 if (bitsize == 16) {
4379 intr = "llvm.amdgcn.frexp.exp.i16.f16";
4380 type = ctx->i16;
4381 } else if (bitsize == 32) {
4382 intr = "llvm.amdgcn.frexp.exp.i32.f32";
4383 type = ctx->i32;
4384 } else {
4385 intr = "llvm.amdgcn.frexp.exp.i32.f64";
4386 type = ctx->i32;
4387 }
4388
4389 LLVMValueRef params[] = {
4390 src0,
4391 };
4392 return ac_build_intrinsic(ctx, intr, type, params, 1,
4393 AC_FUNC_ATTR_READNONE);
4394 }
4395 LLVMValueRef
4396 ac_build_frexp_mant(struct ac_llvm_context *ctx, LLVMValueRef src0,
4397 unsigned bitsize)
4398 {
4399 LLVMTypeRef type;
4400 char *intr;
4401
4402 if (bitsize == 16) {
4403 intr = "llvm.amdgcn.frexp.mant.f16";
4404 type = ctx->f16;
4405 } else if (bitsize == 32) {
4406 intr = "llvm.amdgcn.frexp.mant.f32";
4407 type = ctx->f32;
4408 } else {
4409 intr = "llvm.amdgcn.frexp.mant.f64";
4410 type = ctx->f64;
4411 }
4412
4413 LLVMValueRef params[] = {
4414 src0,
4415 };
4416 return ac_build_intrinsic(ctx, intr, type, params, 1,
4417 AC_FUNC_ATTR_READNONE);
4418 }
4419
4420 /*
4421 * this takes an I,J coordinate pair,
4422 * and works out the X and Y derivatives.
4423 * it returns DDX(I), DDX(J), DDY(I), DDY(J).
4424 */
4425 LLVMValueRef
4426 ac_build_ddxy_interp(struct ac_llvm_context *ctx, LLVMValueRef interp_ij)
4427 {
4428 LLVMValueRef result[4], a;
4429 unsigned i;
4430
4431 for (i = 0; i < 2; i++) {
4432 a = LLVMBuildExtractElement(ctx->builder, interp_ij,
4433 LLVMConstInt(ctx->i32, i, false), "");
4434 result[i] = ac_build_ddxy(ctx, AC_TID_MASK_TOP_LEFT, 1, a);
4435 result[2+i] = ac_build_ddxy(ctx, AC_TID_MASK_TOP_LEFT, 2, a);
4436 }
4437 return ac_build_gather_values(ctx, result, 4);
4438 }
4439
4440 LLVMValueRef
4441 ac_build_load_helper_invocation(struct ac_llvm_context *ctx)
4442 {
4443 LLVMValueRef result = ac_build_intrinsic(ctx, "llvm.amdgcn.ps.live",
4444 ctx->i1, NULL, 0,
4445 AC_FUNC_ATTR_READNONE);
4446 result = LLVMBuildNot(ctx->builder, result, "");
4447 return LLVMBuildSExt(ctx->builder, result, ctx->i32, "");
4448 }