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ac/llvm: fix ac_to_integer_type() for 32-bit const addr space pointers
[mesa.git] / src / amd / llvm / 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 #include <llvm/Config/llvm-config.h>
30
31 #include "c11/threads.h"
32
33 #include <assert.h>
34 #include <stdio.h>
35
36 #include "ac_llvm_util.h"
37 #include "ac_shader_util.h"
38 #include "ac_exp_param.h"
39 #include "util/bitscan.h"
40 #include "util/macros.h"
41 #include "util/u_atomic.h"
42 #include "util/u_math.h"
43 #include "sid.h"
44
45 #include "shader_enums.h"
46
47 #define AC_LLVM_INITIAL_CF_DEPTH 4
48
49 /* Data for if/else/endif and bgnloop/endloop control flow structures.
50 */
51 struct ac_llvm_flow {
52 /* Loop exit or next part of if/else/endif. */
53 LLVMBasicBlockRef next_block;
54 LLVMBasicBlockRef loop_entry_block;
55 };
56
57 /* Initialize module-independent parts of the context.
58 *
59 * The caller is responsible for initializing ctx::module and ctx::builder.
60 */
61 void
62 ac_llvm_context_init(struct ac_llvm_context *ctx,
63 struct ac_llvm_compiler *compiler,
64 enum chip_class chip_class, enum radeon_family family,
65 enum ac_float_mode float_mode, unsigned wave_size,
66 unsigned ballot_mask_bits)
67 {
68 LLVMValueRef args[1];
69
70 ctx->context = LLVMContextCreate();
71
72 ctx->chip_class = chip_class;
73 ctx->family = family;
74 ctx->wave_size = wave_size;
75 ctx->ballot_mask_bits = ballot_mask_bits;
76 ctx->float_mode = float_mode;
77 ctx->module = ac_create_module(wave_size == 32 ? compiler->tm_wave32
78 : compiler->tm,
79 ctx->context);
80 ctx->builder = ac_create_builder(ctx->context, float_mode);
81
82 ctx->voidt = LLVMVoidTypeInContext(ctx->context);
83 ctx->i1 = LLVMInt1TypeInContext(ctx->context);
84 ctx->i8 = LLVMInt8TypeInContext(ctx->context);
85 ctx->i16 = LLVMIntTypeInContext(ctx->context, 16);
86 ctx->i32 = LLVMIntTypeInContext(ctx->context, 32);
87 ctx->i64 = LLVMIntTypeInContext(ctx->context, 64);
88 ctx->intptr = ctx->i32;
89 ctx->f16 = LLVMHalfTypeInContext(ctx->context);
90 ctx->f32 = LLVMFloatTypeInContext(ctx->context);
91 ctx->f64 = LLVMDoubleTypeInContext(ctx->context);
92 ctx->v2i16 = LLVMVectorType(ctx->i16, 2);
93 ctx->v2i32 = LLVMVectorType(ctx->i32, 2);
94 ctx->v3i32 = LLVMVectorType(ctx->i32, 3);
95 ctx->v4i32 = LLVMVectorType(ctx->i32, 4);
96 ctx->v2f32 = LLVMVectorType(ctx->f32, 2);
97 ctx->v3f32 = LLVMVectorType(ctx->f32, 3);
98 ctx->v4f32 = LLVMVectorType(ctx->f32, 4);
99 ctx->v8i32 = LLVMVectorType(ctx->i32, 8);
100 ctx->iN_wavemask = LLVMIntTypeInContext(ctx->context, ctx->wave_size);
101 ctx->iN_ballotmask = LLVMIntTypeInContext(ctx->context, ballot_mask_bits);
102
103 ctx->i8_0 = LLVMConstInt(ctx->i8, 0, false);
104 ctx->i8_1 = LLVMConstInt(ctx->i8, 1, false);
105 ctx->i16_0 = LLVMConstInt(ctx->i16, 0, false);
106 ctx->i16_1 = LLVMConstInt(ctx->i16, 1, false);
107 ctx->i32_0 = LLVMConstInt(ctx->i32, 0, false);
108 ctx->i32_1 = LLVMConstInt(ctx->i32, 1, false);
109 ctx->i64_0 = LLVMConstInt(ctx->i64, 0, false);
110 ctx->i64_1 = LLVMConstInt(ctx->i64, 1, false);
111 ctx->f16_0 = LLVMConstReal(ctx->f16, 0.0);
112 ctx->f16_1 = LLVMConstReal(ctx->f16, 1.0);
113 ctx->f32_0 = LLVMConstReal(ctx->f32, 0.0);
114 ctx->f32_1 = LLVMConstReal(ctx->f32, 1.0);
115 ctx->f64_0 = LLVMConstReal(ctx->f64, 0.0);
116 ctx->f64_1 = LLVMConstReal(ctx->f64, 1.0);
117
118 ctx->i1false = LLVMConstInt(ctx->i1, 0, false);
119 ctx->i1true = LLVMConstInt(ctx->i1, 1, false);
120
121 ctx->range_md_kind = LLVMGetMDKindIDInContext(ctx->context,
122 "range", 5);
123
124 ctx->invariant_load_md_kind = LLVMGetMDKindIDInContext(ctx->context,
125 "invariant.load", 14);
126
127 ctx->fpmath_md_kind = LLVMGetMDKindIDInContext(ctx->context, "fpmath", 6);
128
129 args[0] = LLVMConstReal(ctx->f32, 2.5);
130 ctx->fpmath_md_2p5_ulp = LLVMMDNodeInContext(ctx->context, args, 1);
131
132 ctx->uniform_md_kind = LLVMGetMDKindIDInContext(ctx->context,
133 "amdgpu.uniform", 14);
134
135 ctx->empty_md = LLVMMDNodeInContext(ctx->context, NULL, 0);
136 ctx->flow = calloc(1, sizeof(*ctx->flow));
137 }
138
139 void
140 ac_llvm_context_dispose(struct ac_llvm_context *ctx)
141 {
142 free(ctx->flow->stack);
143 free(ctx->flow);
144 ctx->flow = NULL;
145 }
146
147 int
148 ac_get_llvm_num_components(LLVMValueRef value)
149 {
150 LLVMTypeRef type = LLVMTypeOf(value);
151 unsigned num_components = LLVMGetTypeKind(type) == LLVMVectorTypeKind
152 ? LLVMGetVectorSize(type)
153 : 1;
154 return num_components;
155 }
156
157 LLVMValueRef
158 ac_llvm_extract_elem(struct ac_llvm_context *ac,
159 LLVMValueRef value,
160 int index)
161 {
162 if (LLVMGetTypeKind(LLVMTypeOf(value)) != LLVMVectorTypeKind) {
163 assert(index == 0);
164 return value;
165 }
166
167 return LLVMBuildExtractElement(ac->builder, value,
168 LLVMConstInt(ac->i32, index, false), "");
169 }
170
171 int
172 ac_get_elem_bits(struct ac_llvm_context *ctx, LLVMTypeRef type)
173 {
174 if (LLVMGetTypeKind(type) == LLVMVectorTypeKind)
175 type = LLVMGetElementType(type);
176
177 if (LLVMGetTypeKind(type) == LLVMIntegerTypeKind)
178 return LLVMGetIntTypeWidth(type);
179
180 if (type == ctx->f16)
181 return 16;
182 if (type == ctx->f32)
183 return 32;
184 if (type == ctx->f64)
185 return 64;
186
187 unreachable("Unhandled type kind in get_elem_bits");
188 }
189
190 unsigned
191 ac_get_type_size(LLVMTypeRef type)
192 {
193 LLVMTypeKind kind = LLVMGetTypeKind(type);
194
195 switch (kind) {
196 case LLVMIntegerTypeKind:
197 return LLVMGetIntTypeWidth(type) / 8;
198 case LLVMHalfTypeKind:
199 return 2;
200 case LLVMFloatTypeKind:
201 return 4;
202 case LLVMDoubleTypeKind:
203 return 8;
204 case LLVMPointerTypeKind:
205 if (LLVMGetPointerAddressSpace(type) == AC_ADDR_SPACE_CONST_32BIT)
206 return 4;
207 return 8;
208 case LLVMVectorTypeKind:
209 return LLVMGetVectorSize(type) *
210 ac_get_type_size(LLVMGetElementType(type));
211 case LLVMArrayTypeKind:
212 return LLVMGetArrayLength(type) *
213 ac_get_type_size(LLVMGetElementType(type));
214 default:
215 assert(0);
216 return 0;
217 }
218 }
219
220 static LLVMTypeRef to_integer_type_scalar(struct ac_llvm_context *ctx, LLVMTypeRef t)
221 {
222 if (t == ctx->i8)
223 return ctx->i8;
224 else if (t == ctx->f16 || t == ctx->i16)
225 return ctx->i16;
226 else if (t == ctx->f32 || t == ctx->i32)
227 return ctx->i32;
228 else if (t == ctx->f64 || t == ctx->i64)
229 return ctx->i64;
230 else
231 unreachable("Unhandled integer size");
232 }
233
234 LLVMTypeRef
235 ac_to_integer_type(struct ac_llvm_context *ctx, LLVMTypeRef t)
236 {
237 if (LLVMGetTypeKind(t) == LLVMVectorTypeKind) {
238 LLVMTypeRef elem_type = LLVMGetElementType(t);
239 return LLVMVectorType(to_integer_type_scalar(ctx, elem_type),
240 LLVMGetVectorSize(t));
241 }
242 if (LLVMGetTypeKind(t) == LLVMPointerTypeKind) {
243 switch (LLVMGetPointerAddressSpace(t)) {
244 case AC_ADDR_SPACE_GLOBAL:
245 return ctx->i64;
246 case AC_ADDR_SPACE_CONST_32BIT:
247 case AC_ADDR_SPACE_LDS:
248 return ctx->i32;
249 default:
250 unreachable("unhandled address space");
251 }
252 }
253 return to_integer_type_scalar(ctx, t);
254 }
255
256 LLVMValueRef
257 ac_to_integer(struct ac_llvm_context *ctx, LLVMValueRef v)
258 {
259 LLVMTypeRef type = LLVMTypeOf(v);
260 if (LLVMGetTypeKind(type) == LLVMPointerTypeKind) {
261 return LLVMBuildPtrToInt(ctx->builder, v, ac_to_integer_type(ctx, type), "");
262 }
263 return LLVMBuildBitCast(ctx->builder, v, ac_to_integer_type(ctx, type), "");
264 }
265
266 LLVMValueRef
267 ac_to_integer_or_pointer(struct ac_llvm_context *ctx, LLVMValueRef v)
268 {
269 LLVMTypeRef type = LLVMTypeOf(v);
270 if (LLVMGetTypeKind(type) == LLVMPointerTypeKind)
271 return v;
272 return ac_to_integer(ctx, v);
273 }
274
275 static LLVMTypeRef to_float_type_scalar(struct ac_llvm_context *ctx, LLVMTypeRef t)
276 {
277 if (t == ctx->i8)
278 return ctx->i8;
279 else if (t == ctx->i16 || t == ctx->f16)
280 return ctx->f16;
281 else if (t == ctx->i32 || t == ctx->f32)
282 return ctx->f32;
283 else if (t == ctx->i64 || t == ctx->f64)
284 return ctx->f64;
285 else
286 unreachable("Unhandled float size");
287 }
288
289 LLVMTypeRef
290 ac_to_float_type(struct ac_llvm_context *ctx, LLVMTypeRef t)
291 {
292 if (LLVMGetTypeKind(t) == LLVMVectorTypeKind) {
293 LLVMTypeRef elem_type = LLVMGetElementType(t);
294 return LLVMVectorType(to_float_type_scalar(ctx, elem_type),
295 LLVMGetVectorSize(t));
296 }
297 return to_float_type_scalar(ctx, t);
298 }
299
300 LLVMValueRef
301 ac_to_float(struct ac_llvm_context *ctx, LLVMValueRef v)
302 {
303 LLVMTypeRef type = LLVMTypeOf(v);
304 return LLVMBuildBitCast(ctx->builder, v, ac_to_float_type(ctx, type), "");
305 }
306
307
308 LLVMValueRef
309 ac_build_intrinsic(struct ac_llvm_context *ctx, const char *name,
310 LLVMTypeRef return_type, LLVMValueRef *params,
311 unsigned param_count, unsigned attrib_mask)
312 {
313 LLVMValueRef function, call;
314 bool set_callsite_attrs = !(attrib_mask & AC_FUNC_ATTR_LEGACY);
315
316 function = LLVMGetNamedFunction(ctx->module, name);
317 if (!function) {
318 LLVMTypeRef param_types[32], function_type;
319 unsigned i;
320
321 assert(param_count <= 32);
322
323 for (i = 0; i < param_count; ++i) {
324 assert(params[i]);
325 param_types[i] = LLVMTypeOf(params[i]);
326 }
327 function_type =
328 LLVMFunctionType(return_type, param_types, param_count, 0);
329 function = LLVMAddFunction(ctx->module, name, function_type);
330
331 LLVMSetFunctionCallConv(function, LLVMCCallConv);
332 LLVMSetLinkage(function, LLVMExternalLinkage);
333
334 if (!set_callsite_attrs)
335 ac_add_func_attributes(ctx->context, function, attrib_mask);
336 }
337
338 call = LLVMBuildCall(ctx->builder, function, params, param_count, "");
339 if (set_callsite_attrs)
340 ac_add_func_attributes(ctx->context, call, attrib_mask);
341 return call;
342 }
343
344 /**
345 * Given the i32 or vNi32 \p type, generate the textual name (e.g. for use with
346 * intrinsic names).
347 */
348 void ac_build_type_name_for_intr(LLVMTypeRef type, char *buf, unsigned bufsize)
349 {
350 LLVMTypeRef elem_type = type;
351
352 assert(bufsize >= 8);
353
354 if (LLVMGetTypeKind(type) == LLVMVectorTypeKind) {
355 int ret = snprintf(buf, bufsize, "v%u",
356 LLVMGetVectorSize(type));
357 if (ret < 0) {
358 char *type_name = LLVMPrintTypeToString(type);
359 fprintf(stderr, "Error building type name for: %s\n",
360 type_name);
361 LLVMDisposeMessage(type_name);
362 return;
363 }
364 elem_type = LLVMGetElementType(type);
365 buf += ret;
366 bufsize -= ret;
367 }
368 switch (LLVMGetTypeKind(elem_type)) {
369 default: break;
370 case LLVMIntegerTypeKind:
371 snprintf(buf, bufsize, "i%d", LLVMGetIntTypeWidth(elem_type));
372 break;
373 case LLVMHalfTypeKind:
374 snprintf(buf, bufsize, "f16");
375 break;
376 case LLVMFloatTypeKind:
377 snprintf(buf, bufsize, "f32");
378 break;
379 case LLVMDoubleTypeKind:
380 snprintf(buf, bufsize, "f64");
381 break;
382 }
383 }
384
385 /**
386 * Helper function that builds an LLVM IR PHI node and immediately adds
387 * incoming edges.
388 */
389 LLVMValueRef
390 ac_build_phi(struct ac_llvm_context *ctx, LLVMTypeRef type,
391 unsigned count_incoming, LLVMValueRef *values,
392 LLVMBasicBlockRef *blocks)
393 {
394 LLVMValueRef phi = LLVMBuildPhi(ctx->builder, type, "");
395 LLVMAddIncoming(phi, values, blocks, count_incoming);
396 return phi;
397 }
398
399 void ac_build_s_barrier(struct ac_llvm_context *ctx)
400 {
401 ac_build_intrinsic(ctx, "llvm.amdgcn.s.barrier", ctx->voidt, NULL,
402 0, AC_FUNC_ATTR_CONVERGENT);
403 }
404
405 /* Prevent optimizations (at least of memory accesses) across the current
406 * point in the program by emitting empty inline assembly that is marked as
407 * having side effects.
408 *
409 * Optionally, a value can be passed through the inline assembly to prevent
410 * LLVM from hoisting calls to ReadNone functions.
411 */
412 void
413 ac_build_optimization_barrier(struct ac_llvm_context *ctx,
414 LLVMValueRef *pvgpr)
415 {
416 static int counter = 0;
417
418 LLVMBuilderRef builder = ctx->builder;
419 char code[16];
420
421 snprintf(code, sizeof(code), "; %d", p_atomic_inc_return(&counter));
422
423 if (!pvgpr) {
424 LLVMTypeRef ftype = LLVMFunctionType(ctx->voidt, NULL, 0, false);
425 LLVMValueRef inlineasm = LLVMConstInlineAsm(ftype, code, "", true, false);
426 LLVMBuildCall(builder, inlineasm, NULL, 0, "");
427 } else {
428 LLVMTypeRef ftype = LLVMFunctionType(ctx->i32, &ctx->i32, 1, false);
429 LLVMValueRef inlineasm = LLVMConstInlineAsm(ftype, code, "=v,0", true, false);
430 LLVMValueRef vgpr = *pvgpr;
431 LLVMTypeRef vgpr_type = LLVMTypeOf(vgpr);
432 unsigned vgpr_size = ac_get_type_size(vgpr_type);
433 LLVMValueRef vgpr0;
434
435 assert(vgpr_size % 4 == 0);
436
437 vgpr = LLVMBuildBitCast(builder, vgpr, LLVMVectorType(ctx->i32, vgpr_size / 4), "");
438 vgpr0 = LLVMBuildExtractElement(builder, vgpr, ctx->i32_0, "");
439 vgpr0 = LLVMBuildCall(builder, inlineasm, &vgpr0, 1, "");
440 vgpr = LLVMBuildInsertElement(builder, vgpr, vgpr0, ctx->i32_0, "");
441 vgpr = LLVMBuildBitCast(builder, vgpr, vgpr_type, "");
442
443 *pvgpr = vgpr;
444 }
445 }
446
447 LLVMValueRef
448 ac_build_shader_clock(struct ac_llvm_context *ctx)
449 {
450 const char *intr = LLVM_VERSION_MAJOR >= 9 && ctx->chip_class >= GFX8 ?
451 "llvm.amdgcn.s.memrealtime" : "llvm.readcyclecounter";
452 LLVMValueRef tmp = ac_build_intrinsic(ctx, intr, ctx->i64, NULL, 0, 0);
453 return LLVMBuildBitCast(ctx->builder, tmp, ctx->v2i32, "");
454 }
455
456 LLVMValueRef
457 ac_build_ballot(struct ac_llvm_context *ctx,
458 LLVMValueRef value)
459 {
460 const char *name;
461
462 if (LLVM_VERSION_MAJOR >= 9) {
463 if (ctx->wave_size == 64)
464 name = "llvm.amdgcn.icmp.i64.i32";
465 else
466 name = "llvm.amdgcn.icmp.i32.i32";
467 } else {
468 name = "llvm.amdgcn.icmp.i32";
469 }
470 LLVMValueRef args[3] = {
471 value,
472 ctx->i32_0,
473 LLVMConstInt(ctx->i32, LLVMIntNE, 0)
474 };
475
476 /* We currently have no other way to prevent LLVM from lifting the icmp
477 * calls to a dominating basic block.
478 */
479 ac_build_optimization_barrier(ctx, &args[0]);
480
481 args[0] = ac_to_integer(ctx, args[0]);
482
483 return ac_build_intrinsic(ctx, name, ctx->iN_wavemask, args, 3,
484 AC_FUNC_ATTR_NOUNWIND |
485 AC_FUNC_ATTR_READNONE |
486 AC_FUNC_ATTR_CONVERGENT);
487 }
488
489 LLVMValueRef ac_get_i1_sgpr_mask(struct ac_llvm_context *ctx,
490 LLVMValueRef value)
491 {
492 const char *name = LLVM_VERSION_MAJOR >= 9 ? "llvm.amdgcn.icmp.i64.i1" : "llvm.amdgcn.icmp.i1";
493 LLVMValueRef args[3] = {
494 value,
495 ctx->i1false,
496 LLVMConstInt(ctx->i32, LLVMIntNE, 0),
497 };
498
499 return ac_build_intrinsic(ctx, name, ctx->i64, args, 3,
500 AC_FUNC_ATTR_NOUNWIND |
501 AC_FUNC_ATTR_READNONE |
502 AC_FUNC_ATTR_CONVERGENT);
503 }
504
505 LLVMValueRef
506 ac_build_vote_all(struct ac_llvm_context *ctx, LLVMValueRef value)
507 {
508 LLVMValueRef active_set = ac_build_ballot(ctx, ctx->i32_1);
509 LLVMValueRef vote_set = ac_build_ballot(ctx, value);
510 return LLVMBuildICmp(ctx->builder, LLVMIntEQ, vote_set, active_set, "");
511 }
512
513 LLVMValueRef
514 ac_build_vote_any(struct ac_llvm_context *ctx, LLVMValueRef value)
515 {
516 LLVMValueRef vote_set = ac_build_ballot(ctx, value);
517 return LLVMBuildICmp(ctx->builder, LLVMIntNE, vote_set,
518 LLVMConstInt(ctx->iN_wavemask, 0, 0), "");
519 }
520
521 LLVMValueRef
522 ac_build_vote_eq(struct ac_llvm_context *ctx, LLVMValueRef value)
523 {
524 LLVMValueRef active_set = ac_build_ballot(ctx, ctx->i32_1);
525 LLVMValueRef vote_set = ac_build_ballot(ctx, value);
526
527 LLVMValueRef all = LLVMBuildICmp(ctx->builder, LLVMIntEQ,
528 vote_set, active_set, "");
529 LLVMValueRef none = LLVMBuildICmp(ctx->builder, LLVMIntEQ,
530 vote_set,
531 LLVMConstInt(ctx->iN_wavemask, 0, 0), "");
532 return LLVMBuildOr(ctx->builder, all, none, "");
533 }
534
535 LLVMValueRef
536 ac_build_varying_gather_values(struct ac_llvm_context *ctx, LLVMValueRef *values,
537 unsigned value_count, unsigned component)
538 {
539 LLVMValueRef vec = NULL;
540
541 if (value_count == 1) {
542 return values[component];
543 } else if (!value_count)
544 unreachable("value_count is 0");
545
546 for (unsigned i = component; i < value_count + component; i++) {
547 LLVMValueRef value = values[i];
548
549 if (i == component)
550 vec = LLVMGetUndef( LLVMVectorType(LLVMTypeOf(value), value_count));
551 LLVMValueRef index = LLVMConstInt(ctx->i32, i - component, false);
552 vec = LLVMBuildInsertElement(ctx->builder, vec, value, index, "");
553 }
554 return vec;
555 }
556
557 LLVMValueRef
558 ac_build_gather_values_extended(struct ac_llvm_context *ctx,
559 LLVMValueRef *values,
560 unsigned value_count,
561 unsigned value_stride,
562 bool load,
563 bool always_vector)
564 {
565 LLVMBuilderRef builder = ctx->builder;
566 LLVMValueRef vec = NULL;
567 unsigned i;
568
569 if (value_count == 1 && !always_vector) {
570 if (load)
571 return LLVMBuildLoad(builder, values[0], "");
572 return values[0];
573 } else if (!value_count)
574 unreachable("value_count is 0");
575
576 for (i = 0; i < value_count; i++) {
577 LLVMValueRef value = values[i * value_stride];
578 if (load)
579 value = LLVMBuildLoad(builder, value, "");
580
581 if (!i)
582 vec = LLVMGetUndef( LLVMVectorType(LLVMTypeOf(value), value_count));
583 LLVMValueRef index = LLVMConstInt(ctx->i32, i, false);
584 vec = LLVMBuildInsertElement(builder, vec, value, index, "");
585 }
586 return vec;
587 }
588
589 LLVMValueRef
590 ac_build_gather_values(struct ac_llvm_context *ctx,
591 LLVMValueRef *values,
592 unsigned value_count)
593 {
594 return ac_build_gather_values_extended(ctx, values, value_count, 1, false, false);
595 }
596
597 /* Expand a scalar or vector to <dst_channels x type> by filling the remaining
598 * channels with undef. Extract at most src_channels components from the input.
599 */
600 static LLVMValueRef
601 ac_build_expand(struct ac_llvm_context *ctx,
602 LLVMValueRef value,
603 unsigned src_channels,
604 unsigned dst_channels)
605 {
606 LLVMTypeRef elemtype;
607 LLVMValueRef chan[dst_channels];
608
609 if (LLVMGetTypeKind(LLVMTypeOf(value)) == LLVMVectorTypeKind) {
610 unsigned vec_size = LLVMGetVectorSize(LLVMTypeOf(value));
611
612 if (src_channels == dst_channels && vec_size == dst_channels)
613 return value;
614
615 src_channels = MIN2(src_channels, vec_size);
616
617 for (unsigned i = 0; i < src_channels; i++)
618 chan[i] = ac_llvm_extract_elem(ctx, value, i);
619
620 elemtype = LLVMGetElementType(LLVMTypeOf(value));
621 } else {
622 if (src_channels) {
623 assert(src_channels == 1);
624 chan[0] = value;
625 }
626 elemtype = LLVMTypeOf(value);
627 }
628
629 for (unsigned i = src_channels; i < dst_channels; i++)
630 chan[i] = LLVMGetUndef(elemtype);
631
632 return ac_build_gather_values(ctx, chan, dst_channels);
633 }
634
635 /* Extract components [start, start + channels) from a vector.
636 */
637 LLVMValueRef
638 ac_extract_components(struct ac_llvm_context *ctx,
639 LLVMValueRef value,
640 unsigned start,
641 unsigned channels)
642 {
643 LLVMValueRef chan[channels];
644
645 for (unsigned i = 0; i < channels; i++)
646 chan[i] = ac_llvm_extract_elem(ctx, value, i + start);
647
648 return ac_build_gather_values(ctx, chan, channels);
649 }
650
651 /* Expand a scalar or vector to <4 x type> by filling the remaining channels
652 * with undef. Extract at most num_channels components from the input.
653 */
654 LLVMValueRef ac_build_expand_to_vec4(struct ac_llvm_context *ctx,
655 LLVMValueRef value,
656 unsigned num_channels)
657 {
658 return ac_build_expand(ctx, value, num_channels, 4);
659 }
660
661 LLVMValueRef ac_build_round(struct ac_llvm_context *ctx, LLVMValueRef value)
662 {
663 unsigned type_size = ac_get_type_size(LLVMTypeOf(value));
664 const char *name;
665
666 if (type_size == 2)
667 name = "llvm.rint.f16";
668 else if (type_size == 4)
669 name = "llvm.rint.f32";
670 else
671 name = "llvm.rint.f64";
672
673 return ac_build_intrinsic(ctx, name, LLVMTypeOf(value), &value, 1,
674 AC_FUNC_ATTR_READNONE);
675 }
676
677 LLVMValueRef
678 ac_build_fdiv(struct ac_llvm_context *ctx,
679 LLVMValueRef num,
680 LLVMValueRef den)
681 {
682 /* If we do (num / den), LLVM >= 7.0 does:
683 * return num * v_rcp_f32(den * (fabs(den) > 0x1.0p+96f ? 0x1.0p-32f : 1.0f));
684 *
685 * If we do (num * (1 / den)), LLVM does:
686 * return num * v_rcp_f32(den);
687 */
688 LLVMValueRef one = LLVMConstReal(LLVMTypeOf(num), 1.0);
689 LLVMValueRef rcp = LLVMBuildFDiv(ctx->builder, one, den, "");
690 LLVMValueRef ret = LLVMBuildFMul(ctx->builder, num, rcp, "");
691
692 /* Use v_rcp_f32 instead of precise division. */
693 if (!LLVMIsConstant(ret))
694 LLVMSetMetadata(ret, ctx->fpmath_md_kind, ctx->fpmath_md_2p5_ulp);
695 return ret;
696 }
697
698 /* See fast_idiv_by_const.h. */
699 /* Set: increment = util_fast_udiv_info::increment ? multiplier : 0; */
700 LLVMValueRef ac_build_fast_udiv(struct ac_llvm_context *ctx,
701 LLVMValueRef num,
702 LLVMValueRef multiplier,
703 LLVMValueRef pre_shift,
704 LLVMValueRef post_shift,
705 LLVMValueRef increment)
706 {
707 LLVMBuilderRef builder = ctx->builder;
708
709 num = LLVMBuildLShr(builder, num, pre_shift, "");
710 num = LLVMBuildMul(builder,
711 LLVMBuildZExt(builder, num, ctx->i64, ""),
712 LLVMBuildZExt(builder, multiplier, ctx->i64, ""), "");
713 num = LLVMBuildAdd(builder, num,
714 LLVMBuildZExt(builder, increment, ctx->i64, ""), "");
715 num = LLVMBuildLShr(builder, num, LLVMConstInt(ctx->i64, 32, 0), "");
716 num = LLVMBuildTrunc(builder, num, ctx->i32, "");
717 return LLVMBuildLShr(builder, num, post_shift, "");
718 }
719
720 /* See fast_idiv_by_const.h. */
721 /* If num != UINT_MAX, this more efficient version can be used. */
722 /* Set: increment = util_fast_udiv_info::increment; */
723 LLVMValueRef ac_build_fast_udiv_nuw(struct ac_llvm_context *ctx,
724 LLVMValueRef num,
725 LLVMValueRef multiplier,
726 LLVMValueRef pre_shift,
727 LLVMValueRef post_shift,
728 LLVMValueRef increment)
729 {
730 LLVMBuilderRef builder = ctx->builder;
731
732 num = LLVMBuildLShr(builder, num, pre_shift, "");
733 num = LLVMBuildNUWAdd(builder, num, increment, "");
734 num = LLVMBuildMul(builder,
735 LLVMBuildZExt(builder, num, ctx->i64, ""),
736 LLVMBuildZExt(builder, multiplier, ctx->i64, ""), "");
737 num = LLVMBuildLShr(builder, num, LLVMConstInt(ctx->i64, 32, 0), "");
738 num = LLVMBuildTrunc(builder, num, ctx->i32, "");
739 return LLVMBuildLShr(builder, num, post_shift, "");
740 }
741
742 /* See fast_idiv_by_const.h. */
743 /* Both operands must fit in 31 bits and the divisor must not be 1. */
744 LLVMValueRef ac_build_fast_udiv_u31_d_not_one(struct ac_llvm_context *ctx,
745 LLVMValueRef num,
746 LLVMValueRef multiplier,
747 LLVMValueRef post_shift)
748 {
749 LLVMBuilderRef builder = ctx->builder;
750
751 num = LLVMBuildMul(builder,
752 LLVMBuildZExt(builder, num, ctx->i64, ""),
753 LLVMBuildZExt(builder, multiplier, ctx->i64, ""), "");
754 num = LLVMBuildLShr(builder, num, LLVMConstInt(ctx->i64, 32, 0), "");
755 num = LLVMBuildTrunc(builder, num, ctx->i32, "");
756 return LLVMBuildLShr(builder, num, post_shift, "");
757 }
758
759 /* Coordinates for cube map selection. sc, tc, and ma are as in Table 8.27
760 * of the OpenGL 4.5 (Compatibility Profile) specification, except ma is
761 * already multiplied by two. id is the cube face number.
762 */
763 struct cube_selection_coords {
764 LLVMValueRef stc[2];
765 LLVMValueRef ma;
766 LLVMValueRef id;
767 };
768
769 static void
770 build_cube_intrinsic(struct ac_llvm_context *ctx,
771 LLVMValueRef in[3],
772 struct cube_selection_coords *out)
773 {
774 LLVMTypeRef f32 = ctx->f32;
775
776 out->stc[1] = ac_build_intrinsic(ctx, "llvm.amdgcn.cubetc",
777 f32, in, 3, AC_FUNC_ATTR_READNONE);
778 out->stc[0] = ac_build_intrinsic(ctx, "llvm.amdgcn.cubesc",
779 f32, in, 3, AC_FUNC_ATTR_READNONE);
780 out->ma = ac_build_intrinsic(ctx, "llvm.amdgcn.cubema",
781 f32, in, 3, AC_FUNC_ATTR_READNONE);
782 out->id = ac_build_intrinsic(ctx, "llvm.amdgcn.cubeid",
783 f32, in, 3, AC_FUNC_ATTR_READNONE);
784 }
785
786 /**
787 * Build a manual selection sequence for cube face sc/tc coordinates and
788 * major axis vector (multiplied by 2 for consistency) for the given
789 * vec3 \p coords, for the face implied by \p selcoords.
790 *
791 * For the major axis, we always adjust the sign to be in the direction of
792 * selcoords.ma; i.e., a positive out_ma means that coords is pointed towards
793 * the selcoords major axis.
794 */
795 static void build_cube_select(struct ac_llvm_context *ctx,
796 const struct cube_selection_coords *selcoords,
797 const LLVMValueRef *coords,
798 LLVMValueRef *out_st,
799 LLVMValueRef *out_ma)
800 {
801 LLVMBuilderRef builder = ctx->builder;
802 LLVMTypeRef f32 = LLVMTypeOf(coords[0]);
803 LLVMValueRef is_ma_positive;
804 LLVMValueRef sgn_ma;
805 LLVMValueRef is_ma_z, is_not_ma_z;
806 LLVMValueRef is_ma_y;
807 LLVMValueRef is_ma_x;
808 LLVMValueRef sgn;
809 LLVMValueRef tmp;
810
811 is_ma_positive = LLVMBuildFCmp(builder, LLVMRealUGE,
812 selcoords->ma, LLVMConstReal(f32, 0.0), "");
813 sgn_ma = LLVMBuildSelect(builder, is_ma_positive,
814 LLVMConstReal(f32, 1.0), LLVMConstReal(f32, -1.0), "");
815
816 is_ma_z = LLVMBuildFCmp(builder, LLVMRealUGE, selcoords->id, LLVMConstReal(f32, 4.0), "");
817 is_not_ma_z = LLVMBuildNot(builder, is_ma_z, "");
818 is_ma_y = LLVMBuildAnd(builder, is_not_ma_z,
819 LLVMBuildFCmp(builder, LLVMRealUGE, selcoords->id, LLVMConstReal(f32, 2.0), ""), "");
820 is_ma_x = LLVMBuildAnd(builder, is_not_ma_z, LLVMBuildNot(builder, is_ma_y, ""), "");
821
822 /* Select sc */
823 tmp = LLVMBuildSelect(builder, is_ma_x, coords[2], coords[0], "");
824 sgn = LLVMBuildSelect(builder, is_ma_y, LLVMConstReal(f32, 1.0),
825 LLVMBuildSelect(builder, is_ma_z, sgn_ma,
826 LLVMBuildFNeg(builder, sgn_ma, ""), ""), "");
827 out_st[0] = LLVMBuildFMul(builder, tmp, sgn, "");
828
829 /* Select tc */
830 tmp = LLVMBuildSelect(builder, is_ma_y, coords[2], coords[1], "");
831 sgn = LLVMBuildSelect(builder, is_ma_y, sgn_ma,
832 LLVMConstReal(f32, -1.0), "");
833 out_st[1] = LLVMBuildFMul(builder, tmp, sgn, "");
834
835 /* Select ma */
836 tmp = LLVMBuildSelect(builder, is_ma_z, coords[2],
837 LLVMBuildSelect(builder, is_ma_y, coords[1], coords[0], ""), "");
838 tmp = ac_build_intrinsic(ctx, "llvm.fabs.f32",
839 ctx->f32, &tmp, 1, AC_FUNC_ATTR_READNONE);
840 *out_ma = LLVMBuildFMul(builder, tmp, LLVMConstReal(f32, 2.0), "");
841 }
842
843 void
844 ac_prepare_cube_coords(struct ac_llvm_context *ctx,
845 bool is_deriv, bool is_array, bool is_lod,
846 LLVMValueRef *coords_arg,
847 LLVMValueRef *derivs_arg)
848 {
849
850 LLVMBuilderRef builder = ctx->builder;
851 struct cube_selection_coords selcoords;
852 LLVMValueRef coords[3];
853 LLVMValueRef invma;
854
855 if (is_array && !is_lod) {
856 LLVMValueRef tmp = ac_build_round(ctx, coords_arg[3]);
857
858 /* Section 8.9 (Texture Functions) of the GLSL 4.50 spec says:
859 *
860 * "For Array forms, the array layer used will be
861 *
862 * max(0, min(d−1, floor(layer+0.5)))
863 *
864 * where d is the depth of the texture array and layer
865 * comes from the component indicated in the tables below.
866 * Workaroudn for an issue where the layer is taken from a
867 * helper invocation which happens to fall on a different
868 * layer due to extrapolation."
869 *
870 * GFX8 and earlier attempt to implement this in hardware by
871 * clamping the value of coords[2] = (8 * layer) + face.
872 * Unfortunately, this means that the we end up with the wrong
873 * face when clamping occurs.
874 *
875 * Clamp the layer earlier to work around the issue.
876 */
877 if (ctx->chip_class <= GFX8) {
878 LLVMValueRef ge0;
879 ge0 = LLVMBuildFCmp(builder, LLVMRealOGE, tmp, ctx->f32_0, "");
880 tmp = LLVMBuildSelect(builder, ge0, tmp, ctx->f32_0, "");
881 }
882
883 coords_arg[3] = tmp;
884 }
885
886 build_cube_intrinsic(ctx, coords_arg, &selcoords);
887
888 invma = ac_build_intrinsic(ctx, "llvm.fabs.f32",
889 ctx->f32, &selcoords.ma, 1, AC_FUNC_ATTR_READNONE);
890 invma = ac_build_fdiv(ctx, LLVMConstReal(ctx->f32, 1.0), invma);
891
892 for (int i = 0; i < 2; ++i)
893 coords[i] = LLVMBuildFMul(builder, selcoords.stc[i], invma, "");
894
895 coords[2] = selcoords.id;
896
897 if (is_deriv && derivs_arg) {
898 LLVMValueRef derivs[4];
899 int axis;
900
901 /* Convert cube derivatives to 2D derivatives. */
902 for (axis = 0; axis < 2; axis++) {
903 LLVMValueRef deriv_st[2];
904 LLVMValueRef deriv_ma;
905
906 /* Transform the derivative alongside the texture
907 * coordinate. Mathematically, the correct formula is
908 * as follows. Assume we're projecting onto the +Z face
909 * and denote by dx/dh the derivative of the (original)
910 * X texture coordinate with respect to horizontal
911 * window coordinates. The projection onto the +Z face
912 * plane is:
913 *
914 * f(x,z) = x/z
915 *
916 * Then df/dh = df/dx * dx/dh + df/dz * dz/dh
917 * = 1/z * dx/dh - x/z * 1/z * dz/dh.
918 *
919 * This motivatives the implementation below.
920 *
921 * Whether this actually gives the expected results for
922 * apps that might feed in derivatives obtained via
923 * finite differences is anyone's guess. The OpenGL spec
924 * seems awfully quiet about how textureGrad for cube
925 * maps should be handled.
926 */
927 build_cube_select(ctx, &selcoords, &derivs_arg[axis * 3],
928 deriv_st, &deriv_ma);
929
930 deriv_ma = LLVMBuildFMul(builder, deriv_ma, invma, "");
931
932 for (int i = 0; i < 2; ++i)
933 derivs[axis * 2 + i] =
934 LLVMBuildFSub(builder,
935 LLVMBuildFMul(builder, deriv_st[i], invma, ""),
936 LLVMBuildFMul(builder, deriv_ma, coords[i], ""), "");
937 }
938
939 memcpy(derivs_arg, derivs, sizeof(derivs));
940 }
941
942 /* Shift the texture coordinate. This must be applied after the
943 * derivative calculation.
944 */
945 for (int i = 0; i < 2; ++i)
946 coords[i] = LLVMBuildFAdd(builder, coords[i], LLVMConstReal(ctx->f32, 1.5), "");
947
948 if (is_array) {
949 /* for cube arrays coord.z = coord.w(array_index) * 8 + face */
950 /* coords_arg.w component - array_index for cube arrays */
951 coords[2] = ac_build_fmad(ctx, coords_arg[3], LLVMConstReal(ctx->f32, 8.0), coords[2]);
952 }
953
954 memcpy(coords_arg, coords, sizeof(coords));
955 }
956
957
958 LLVMValueRef
959 ac_build_fs_interp(struct ac_llvm_context *ctx,
960 LLVMValueRef llvm_chan,
961 LLVMValueRef attr_number,
962 LLVMValueRef params,
963 LLVMValueRef i,
964 LLVMValueRef j)
965 {
966 LLVMValueRef args[5];
967 LLVMValueRef p1;
968
969 args[0] = i;
970 args[1] = llvm_chan;
971 args[2] = attr_number;
972 args[3] = params;
973
974 p1 = ac_build_intrinsic(ctx, "llvm.amdgcn.interp.p1",
975 ctx->f32, args, 4, AC_FUNC_ATTR_READNONE);
976
977 args[0] = p1;
978 args[1] = j;
979 args[2] = llvm_chan;
980 args[3] = attr_number;
981 args[4] = params;
982
983 return ac_build_intrinsic(ctx, "llvm.amdgcn.interp.p2",
984 ctx->f32, args, 5, AC_FUNC_ATTR_READNONE);
985 }
986
987 LLVMValueRef
988 ac_build_fs_interp_f16(struct ac_llvm_context *ctx,
989 LLVMValueRef llvm_chan,
990 LLVMValueRef attr_number,
991 LLVMValueRef params,
992 LLVMValueRef i,
993 LLVMValueRef j)
994 {
995 LLVMValueRef args[6];
996 LLVMValueRef p1;
997
998 args[0] = i;
999 args[1] = llvm_chan;
1000 args[2] = attr_number;
1001 args[3] = ctx->i1false;
1002 args[4] = params;
1003
1004 p1 = ac_build_intrinsic(ctx, "llvm.amdgcn.interp.p1.f16",
1005 ctx->f32, args, 5, AC_FUNC_ATTR_READNONE);
1006
1007 args[0] = p1;
1008 args[1] = j;
1009 args[2] = llvm_chan;
1010 args[3] = attr_number;
1011 args[4] = ctx->i1false;
1012 args[5] = params;
1013
1014 return ac_build_intrinsic(ctx, "llvm.amdgcn.interp.p2.f16",
1015 ctx->f16, args, 6, AC_FUNC_ATTR_READNONE);
1016 }
1017
1018 LLVMValueRef
1019 ac_build_fs_interp_mov(struct ac_llvm_context *ctx,
1020 LLVMValueRef parameter,
1021 LLVMValueRef llvm_chan,
1022 LLVMValueRef attr_number,
1023 LLVMValueRef params)
1024 {
1025 LLVMValueRef args[4];
1026
1027 args[0] = parameter;
1028 args[1] = llvm_chan;
1029 args[2] = attr_number;
1030 args[3] = params;
1031
1032 return ac_build_intrinsic(ctx, "llvm.amdgcn.interp.mov",
1033 ctx->f32, args, 4, AC_FUNC_ATTR_READNONE);
1034 }
1035
1036 LLVMValueRef
1037 ac_build_gep_ptr(struct ac_llvm_context *ctx,
1038 LLVMValueRef base_ptr,
1039 LLVMValueRef index)
1040 {
1041 return LLVMBuildGEP(ctx->builder, base_ptr, &index, 1, "");
1042 }
1043
1044 LLVMValueRef
1045 ac_build_gep0(struct ac_llvm_context *ctx,
1046 LLVMValueRef base_ptr,
1047 LLVMValueRef index)
1048 {
1049 LLVMValueRef indices[2] = {
1050 ctx->i32_0,
1051 index,
1052 };
1053 return LLVMBuildGEP(ctx->builder, base_ptr, indices, 2, "");
1054 }
1055
1056 LLVMValueRef ac_build_pointer_add(struct ac_llvm_context *ctx, LLVMValueRef ptr,
1057 LLVMValueRef index)
1058 {
1059 return LLVMBuildPointerCast(ctx->builder,
1060 LLVMBuildGEP(ctx->builder, ptr, &index, 1, ""),
1061 LLVMTypeOf(ptr), "");
1062 }
1063
1064 void
1065 ac_build_indexed_store(struct ac_llvm_context *ctx,
1066 LLVMValueRef base_ptr, LLVMValueRef index,
1067 LLVMValueRef value)
1068 {
1069 LLVMBuildStore(ctx->builder, value,
1070 ac_build_gep0(ctx, base_ptr, index));
1071 }
1072
1073 /**
1074 * Build an LLVM bytecode indexed load using LLVMBuildGEP + LLVMBuildLoad.
1075 * It's equivalent to doing a load from &base_ptr[index].
1076 *
1077 * \param base_ptr Where the array starts.
1078 * \param index The element index into the array.
1079 * \param uniform Whether the base_ptr and index can be assumed to be
1080 * dynamically uniform (i.e. load to an SGPR)
1081 * \param invariant Whether the load is invariant (no other opcodes affect it)
1082 * \param no_unsigned_wraparound
1083 * For all possible re-associations and re-distributions of an expression
1084 * "base_ptr + index * elemsize" into "addr + offset" (excluding GEPs
1085 * without inbounds in base_ptr), this parameter is true if "addr + offset"
1086 * does not result in an unsigned integer wraparound. This is used for
1087 * optimal code generation of 32-bit pointer arithmetic.
1088 *
1089 * For example, a 32-bit immediate offset that causes a 32-bit unsigned
1090 * integer wraparound can't be an imm offset in s_load_dword, because
1091 * the instruction performs "addr + offset" in 64 bits.
1092 *
1093 * Expected usage for bindless textures by chaining GEPs:
1094 * // possible unsigned wraparound, don't use InBounds:
1095 * ptr1 = LLVMBuildGEP(base_ptr, index);
1096 * image = load(ptr1); // becomes "s_load ptr1, 0"
1097 *
1098 * ptr2 = LLVMBuildInBoundsGEP(ptr1, 32 / elemsize);
1099 * sampler = load(ptr2); // becomes "s_load ptr1, 32" thanks to InBounds
1100 */
1101 static LLVMValueRef
1102 ac_build_load_custom(struct ac_llvm_context *ctx, LLVMValueRef base_ptr,
1103 LLVMValueRef index, bool uniform, bool invariant,
1104 bool no_unsigned_wraparound)
1105 {
1106 LLVMValueRef pointer, result;
1107
1108 if (no_unsigned_wraparound &&
1109 LLVMGetPointerAddressSpace(LLVMTypeOf(base_ptr)) == AC_ADDR_SPACE_CONST_32BIT)
1110 pointer = LLVMBuildInBoundsGEP(ctx->builder, base_ptr, &index, 1, "");
1111 else
1112 pointer = LLVMBuildGEP(ctx->builder, base_ptr, &index, 1, "");
1113
1114 if (uniform)
1115 LLVMSetMetadata(pointer, ctx->uniform_md_kind, ctx->empty_md);
1116 result = LLVMBuildLoad(ctx->builder, pointer, "");
1117 if (invariant)
1118 LLVMSetMetadata(result, ctx->invariant_load_md_kind, ctx->empty_md);
1119 return result;
1120 }
1121
1122 LLVMValueRef ac_build_load(struct ac_llvm_context *ctx, LLVMValueRef base_ptr,
1123 LLVMValueRef index)
1124 {
1125 return ac_build_load_custom(ctx, base_ptr, index, false, false, false);
1126 }
1127
1128 LLVMValueRef ac_build_load_invariant(struct ac_llvm_context *ctx,
1129 LLVMValueRef base_ptr, LLVMValueRef index)
1130 {
1131 return ac_build_load_custom(ctx, base_ptr, index, false, true, false);
1132 }
1133
1134 /* This assumes that there is no unsigned integer wraparound during the address
1135 * computation, excluding all GEPs within base_ptr. */
1136 LLVMValueRef ac_build_load_to_sgpr(struct ac_llvm_context *ctx,
1137 LLVMValueRef base_ptr, LLVMValueRef index)
1138 {
1139 return ac_build_load_custom(ctx, base_ptr, index, true, true, true);
1140 }
1141
1142 /* See ac_build_load_custom() documentation. */
1143 LLVMValueRef ac_build_load_to_sgpr_uint_wraparound(struct ac_llvm_context *ctx,
1144 LLVMValueRef base_ptr, LLVMValueRef index)
1145 {
1146 return ac_build_load_custom(ctx, base_ptr, index, true, true, false);
1147 }
1148
1149 static unsigned get_load_cache_policy(struct ac_llvm_context *ctx,
1150 unsigned cache_policy)
1151 {
1152 return cache_policy |
1153 (ctx->chip_class >= GFX10 && cache_policy & ac_glc ? ac_dlc : 0);
1154 }
1155
1156 static void
1157 ac_build_buffer_store_common(struct ac_llvm_context *ctx,
1158 LLVMValueRef rsrc,
1159 LLVMValueRef data,
1160 LLVMValueRef vindex,
1161 LLVMValueRef voffset,
1162 LLVMValueRef soffset,
1163 unsigned num_channels,
1164 LLVMTypeRef return_channel_type,
1165 unsigned cache_policy,
1166 bool use_format,
1167 bool structurized)
1168 {
1169 LLVMValueRef args[6];
1170 int idx = 0;
1171 args[idx++] = data;
1172 args[idx++] = LLVMBuildBitCast(ctx->builder, rsrc, ctx->v4i32, "");
1173 if (structurized)
1174 args[idx++] = vindex ? vindex : ctx->i32_0;
1175 args[idx++] = voffset ? voffset : ctx->i32_0;
1176 args[idx++] = soffset ? soffset : ctx->i32_0;
1177 args[idx++] = LLVMConstInt(ctx->i32, cache_policy, 0);
1178 unsigned func = !ac_has_vec3_support(ctx->chip_class, use_format) && num_channels == 3 ? 4 : num_channels;
1179 const char *indexing_kind = structurized ? "struct" : "raw";
1180 char name[256], type_name[8];
1181
1182 LLVMTypeRef type = func > 1 ? LLVMVectorType(return_channel_type, func) : return_channel_type;
1183 ac_build_type_name_for_intr(type, type_name, sizeof(type_name));
1184
1185 if (use_format) {
1186 snprintf(name, sizeof(name), "llvm.amdgcn.%s.buffer.store.format.%s",
1187 indexing_kind, type_name);
1188 } else {
1189 snprintf(name, sizeof(name), "llvm.amdgcn.%s.buffer.store.%s",
1190 indexing_kind, type_name);
1191 }
1192
1193 ac_build_intrinsic(ctx, name, ctx->voidt, args, idx,
1194 AC_FUNC_ATTR_INACCESSIBLE_MEM_ONLY);
1195 }
1196
1197 void
1198 ac_build_buffer_store_format(struct ac_llvm_context *ctx,
1199 LLVMValueRef rsrc,
1200 LLVMValueRef data,
1201 LLVMValueRef vindex,
1202 LLVMValueRef voffset,
1203 unsigned num_channels,
1204 unsigned cache_policy)
1205 {
1206 ac_build_buffer_store_common(ctx, rsrc, data, vindex,
1207 voffset, NULL, num_channels,
1208 ctx->f32, cache_policy,
1209 true, true);
1210 }
1211
1212 /* TBUFFER_STORE_FORMAT_{X,XY,XYZ,XYZW} <- the suffix is selected by num_channels=1..4.
1213 * The type of vdata must be one of i32 (num_channels=1), v2i32 (num_channels=2),
1214 * or v4i32 (num_channels=3,4).
1215 */
1216 void
1217 ac_build_buffer_store_dword(struct ac_llvm_context *ctx,
1218 LLVMValueRef rsrc,
1219 LLVMValueRef vdata,
1220 unsigned num_channels,
1221 LLVMValueRef voffset,
1222 LLVMValueRef soffset,
1223 unsigned inst_offset,
1224 unsigned cache_policy,
1225 bool swizzle_enable_hint)
1226 {
1227 /* Split 3 channel stores, because only LLVM 9+ support 3-channel
1228 * intrinsics. */
1229 if (num_channels == 3 && !ac_has_vec3_support(ctx->chip_class, false)) {
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, cache_policy,
1240 swizzle_enable_hint);
1241 ac_build_buffer_store_dword(ctx, rsrc, v[2], 1, voffset,
1242 soffset, inst_offset + 8,
1243 cache_policy,
1244 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 ac_build_buffer_store_common(ctx, rsrc, ac_to_float(ctx, vdata),
1260 ctx->i32_0, voffset, offset,
1261 num_channels, ctx->f32,
1262 cache_policy, false, false);
1263 return;
1264 }
1265
1266 static const unsigned dfmts[] = {
1267 V_008F0C_BUF_DATA_FORMAT_32,
1268 V_008F0C_BUF_DATA_FORMAT_32_32,
1269 V_008F0C_BUF_DATA_FORMAT_32_32_32,
1270 V_008F0C_BUF_DATA_FORMAT_32_32_32_32
1271 };
1272 unsigned dfmt = dfmts[num_channels - 1];
1273 unsigned nfmt = V_008F0C_BUF_NUM_FORMAT_UINT;
1274 LLVMValueRef immoffset = LLVMConstInt(ctx->i32, inst_offset, 0);
1275
1276 ac_build_raw_tbuffer_store(ctx, rsrc, vdata, voffset, soffset,
1277 immoffset, num_channels, dfmt, nfmt, cache_policy);
1278 }
1279
1280 static LLVMValueRef
1281 ac_build_buffer_load_common(struct ac_llvm_context *ctx,
1282 LLVMValueRef rsrc,
1283 LLVMValueRef vindex,
1284 LLVMValueRef voffset,
1285 LLVMValueRef soffset,
1286 unsigned num_channels,
1287 LLVMTypeRef channel_type,
1288 unsigned cache_policy,
1289 bool can_speculate,
1290 bool use_format,
1291 bool structurized)
1292 {
1293 LLVMValueRef args[5];
1294 int idx = 0;
1295 args[idx++] = LLVMBuildBitCast(ctx->builder, rsrc, ctx->v4i32, "");
1296 if (structurized)
1297 args[idx++] = vindex ? vindex : ctx->i32_0;
1298 args[idx++] = voffset ? voffset : ctx->i32_0;
1299 args[idx++] = soffset ? soffset : ctx->i32_0;
1300 args[idx++] = LLVMConstInt(ctx->i32, get_load_cache_policy(ctx, cache_policy), 0);
1301 unsigned func = !ac_has_vec3_support(ctx->chip_class, use_format) && num_channels == 3 ? 4 : num_channels;
1302 const char *indexing_kind = structurized ? "struct" : "raw";
1303 char name[256], type_name[8];
1304
1305 LLVMTypeRef type = func > 1 ? LLVMVectorType(channel_type, func) : channel_type;
1306 ac_build_type_name_for_intr(type, type_name, sizeof(type_name));
1307
1308 if (use_format) {
1309 snprintf(name, sizeof(name), "llvm.amdgcn.%s.buffer.load.format.%s",
1310 indexing_kind, type_name);
1311 } else {
1312 snprintf(name, sizeof(name), "llvm.amdgcn.%s.buffer.load.%s",
1313 indexing_kind, type_name);
1314 }
1315
1316 return ac_build_intrinsic(ctx, name, type, args, idx,
1317 ac_get_load_intr_attribs(can_speculate));
1318 }
1319
1320 LLVMValueRef
1321 ac_build_buffer_load(struct ac_llvm_context *ctx,
1322 LLVMValueRef rsrc,
1323 int num_channels,
1324 LLVMValueRef vindex,
1325 LLVMValueRef voffset,
1326 LLVMValueRef soffset,
1327 unsigned inst_offset,
1328 unsigned cache_policy,
1329 bool can_speculate,
1330 bool allow_smem)
1331 {
1332 LLVMValueRef offset = LLVMConstInt(ctx->i32, inst_offset, 0);
1333 if (voffset)
1334 offset = LLVMBuildAdd(ctx->builder, offset, voffset, "");
1335 if (soffset)
1336 offset = LLVMBuildAdd(ctx->builder, offset, soffset, "");
1337
1338 if (allow_smem && !(cache_policy & ac_slc) &&
1339 (!(cache_policy & ac_glc) || ctx->chip_class >= GFX8)) {
1340 assert(vindex == NULL);
1341
1342 LLVMValueRef result[8];
1343
1344 for (int i = 0; i < num_channels; i++) {
1345 if (i) {
1346 offset = LLVMBuildAdd(ctx->builder, offset,
1347 LLVMConstInt(ctx->i32, 4, 0), "");
1348 }
1349 LLVMValueRef args[3] = {
1350 rsrc,
1351 offset,
1352 LLVMConstInt(ctx->i32, get_load_cache_policy(ctx, cache_policy), 0),
1353 };
1354 result[i] = ac_build_intrinsic(ctx,
1355 "llvm.amdgcn.s.buffer.load.f32",
1356 ctx->f32, args, 3,
1357 AC_FUNC_ATTR_READNONE);
1358 }
1359 if (num_channels == 1)
1360 return result[0];
1361
1362 if (num_channels == 3 && !ac_has_vec3_support(ctx->chip_class, false))
1363 result[num_channels++] = LLVMGetUndef(ctx->f32);
1364 return ac_build_gather_values(ctx, result, num_channels);
1365 }
1366
1367 return ac_build_buffer_load_common(ctx, rsrc, vindex,
1368 offset, ctx->i32_0,
1369 num_channels, ctx->f32,
1370 cache_policy,
1371 can_speculate, false, false);
1372 }
1373
1374 LLVMValueRef ac_build_buffer_load_format(struct ac_llvm_context *ctx,
1375 LLVMValueRef rsrc,
1376 LLVMValueRef vindex,
1377 LLVMValueRef voffset,
1378 unsigned num_channels,
1379 unsigned cache_policy,
1380 bool can_speculate)
1381 {
1382 return ac_build_buffer_load_common(ctx, rsrc, vindex, voffset,
1383 ctx->i32_0, num_channels, ctx->f32,
1384 cache_policy, can_speculate,
1385 true, true);
1386 }
1387
1388 static LLVMValueRef
1389 ac_build_tbuffer_load(struct ac_llvm_context *ctx,
1390 LLVMValueRef rsrc,
1391 LLVMValueRef vindex,
1392 LLVMValueRef voffset,
1393 LLVMValueRef soffset,
1394 LLVMValueRef immoffset,
1395 unsigned num_channels,
1396 unsigned dfmt,
1397 unsigned nfmt,
1398 unsigned cache_policy,
1399 bool can_speculate,
1400 bool structurized)
1401 {
1402 voffset = LLVMBuildAdd(ctx->builder, voffset, immoffset, "");
1403
1404 LLVMValueRef args[6];
1405 int idx = 0;
1406 args[idx++] = LLVMBuildBitCast(ctx->builder, rsrc, ctx->v4i32, "");
1407 if (structurized)
1408 args[idx++] = vindex ? vindex : ctx->i32_0;
1409 args[idx++] = voffset ? voffset : ctx->i32_0;
1410 args[idx++] = soffset ? soffset : ctx->i32_0;
1411 args[idx++] = LLVMConstInt(ctx->i32, ac_get_tbuffer_format(ctx->chip_class, dfmt, nfmt), 0);
1412 args[idx++] = LLVMConstInt(ctx->i32, get_load_cache_policy(ctx, cache_policy), 0);
1413 unsigned func = !ac_has_vec3_support(ctx->chip_class, true) && num_channels == 3 ? 4 : num_channels;
1414 const char *indexing_kind = structurized ? "struct" : "raw";
1415 char name[256], type_name[8];
1416
1417 LLVMTypeRef type = func > 1 ? LLVMVectorType(ctx->i32, func) : ctx->i32;
1418 ac_build_type_name_for_intr(type, type_name, sizeof(type_name));
1419
1420 snprintf(name, sizeof(name), "llvm.amdgcn.%s.tbuffer.load.%s",
1421 indexing_kind, type_name);
1422
1423 return ac_build_intrinsic(ctx, name, type, args, idx,
1424 ac_get_load_intr_attribs(can_speculate));
1425 }
1426
1427 LLVMValueRef
1428 ac_build_struct_tbuffer_load(struct ac_llvm_context *ctx,
1429 LLVMValueRef rsrc,
1430 LLVMValueRef vindex,
1431 LLVMValueRef voffset,
1432 LLVMValueRef soffset,
1433 LLVMValueRef immoffset,
1434 unsigned num_channels,
1435 unsigned dfmt,
1436 unsigned nfmt,
1437 unsigned cache_policy,
1438 bool can_speculate)
1439 {
1440 return ac_build_tbuffer_load(ctx, rsrc, vindex, voffset, soffset,
1441 immoffset, num_channels, dfmt, nfmt,
1442 cache_policy, can_speculate, true);
1443 }
1444
1445 LLVMValueRef
1446 ac_build_raw_tbuffer_load(struct ac_llvm_context *ctx,
1447 LLVMValueRef rsrc,
1448 LLVMValueRef voffset,
1449 LLVMValueRef soffset,
1450 LLVMValueRef immoffset,
1451 unsigned num_channels,
1452 unsigned dfmt,
1453 unsigned nfmt,
1454 unsigned cache_policy,
1455 bool can_speculate)
1456 {
1457 return ac_build_tbuffer_load(ctx, rsrc, NULL, voffset, soffset,
1458 immoffset, num_channels, dfmt, nfmt,
1459 cache_policy, can_speculate, false);
1460 }
1461
1462 LLVMValueRef
1463 ac_build_tbuffer_load_short(struct ac_llvm_context *ctx,
1464 LLVMValueRef rsrc,
1465 LLVMValueRef voffset,
1466 LLVMValueRef soffset,
1467 LLVMValueRef immoffset,
1468 unsigned cache_policy)
1469 {
1470 LLVMValueRef res;
1471
1472 if (LLVM_VERSION_MAJOR >= 9) {
1473 voffset = LLVMBuildAdd(ctx->builder, voffset, immoffset, "");
1474
1475 /* LLVM 9+ supports i8/i16 with struct/raw intrinsics. */
1476 res = ac_build_buffer_load_common(ctx, rsrc, NULL,
1477 voffset, soffset,
1478 1, ctx->i16, cache_policy,
1479 false, false, false);
1480 } else {
1481 unsigned dfmt = V_008F0C_BUF_DATA_FORMAT_16;
1482 unsigned nfmt = V_008F0C_BUF_NUM_FORMAT_UINT;
1483
1484 res = ac_build_raw_tbuffer_load(ctx, rsrc, voffset, soffset,
1485 immoffset, 1, dfmt, nfmt, cache_policy,
1486 false);
1487
1488 res = LLVMBuildTrunc(ctx->builder, res, ctx->i16, "");
1489 }
1490
1491 return res;
1492 }
1493
1494 LLVMValueRef
1495 ac_build_tbuffer_load_byte(struct ac_llvm_context *ctx,
1496 LLVMValueRef rsrc,
1497 LLVMValueRef voffset,
1498 LLVMValueRef soffset,
1499 LLVMValueRef immoffset,
1500 unsigned cache_policy)
1501 {
1502 LLVMValueRef res;
1503
1504 if (LLVM_VERSION_MAJOR >= 9) {
1505 voffset = LLVMBuildAdd(ctx->builder, voffset, immoffset, "");
1506
1507 /* LLVM 9+ supports i8/i16 with struct/raw intrinsics. */
1508 res = ac_build_buffer_load_common(ctx, rsrc, NULL,
1509 voffset, soffset,
1510 1, ctx->i8, cache_policy,
1511 false, false, false);
1512 } else {
1513 unsigned dfmt = V_008F0C_BUF_DATA_FORMAT_8;
1514 unsigned nfmt = V_008F0C_BUF_NUM_FORMAT_UINT;
1515
1516 res = ac_build_raw_tbuffer_load(ctx, rsrc, voffset, soffset,
1517 immoffset, 1, dfmt, nfmt, cache_policy,
1518 false);
1519
1520 res = LLVMBuildTrunc(ctx->builder, res, ctx->i8, "");
1521 }
1522
1523 return res;
1524 }
1525
1526 /**
1527 * Convert an 11- or 10-bit unsigned floating point number to an f32.
1528 *
1529 * The input exponent is expected to be biased analogous to IEEE-754, i.e. by
1530 * 2^(exp_bits-1) - 1 (as defined in OpenGL and other graphics APIs).
1531 */
1532 static LLVMValueRef
1533 ac_ufN_to_float(struct ac_llvm_context *ctx, LLVMValueRef src, unsigned exp_bits, unsigned mant_bits)
1534 {
1535 assert(LLVMTypeOf(src) == ctx->i32);
1536
1537 LLVMValueRef tmp;
1538 LLVMValueRef mantissa;
1539 mantissa = LLVMBuildAnd(ctx->builder, src, LLVMConstInt(ctx->i32, (1 << mant_bits) - 1, false), "");
1540
1541 /* Converting normal numbers is just a shift + correcting the exponent bias */
1542 unsigned normal_shift = 23 - mant_bits;
1543 unsigned bias_shift = 127 - ((1 << (exp_bits - 1)) - 1);
1544 LLVMValueRef shifted, normal;
1545
1546 shifted = LLVMBuildShl(ctx->builder, src, LLVMConstInt(ctx->i32, normal_shift, false), "");
1547 normal = LLVMBuildAdd(ctx->builder, shifted, LLVMConstInt(ctx->i32, bias_shift << 23, false), "");
1548
1549 /* Converting nan/inf numbers is the same, but with a different exponent update */
1550 LLVMValueRef naninf;
1551 naninf = LLVMBuildOr(ctx->builder, normal, LLVMConstInt(ctx->i32, 0xff << 23, false), "");
1552
1553 /* Converting denormals is the complex case: determine the leading zeros of the
1554 * mantissa to obtain the correct shift for the mantissa and exponent correction.
1555 */
1556 LLVMValueRef denormal;
1557 LLVMValueRef params[2] = {
1558 mantissa,
1559 ctx->i1true, /* result can be undef when arg is 0 */
1560 };
1561 LLVMValueRef ctlz = ac_build_intrinsic(ctx, "llvm.ctlz.i32", ctx->i32,
1562 params, 2, AC_FUNC_ATTR_READNONE);
1563
1564 /* Shift such that the leading 1 ends up as the LSB of the exponent field. */
1565 tmp = LLVMBuildSub(ctx->builder, ctlz, LLVMConstInt(ctx->i32, 8, false), "");
1566 denormal = LLVMBuildShl(ctx->builder, mantissa, tmp, "");
1567
1568 unsigned denormal_exp = bias_shift + (32 - mant_bits) - 1;
1569 tmp = LLVMBuildSub(ctx->builder, LLVMConstInt(ctx->i32, denormal_exp, false), ctlz, "");
1570 tmp = LLVMBuildShl(ctx->builder, tmp, LLVMConstInt(ctx->i32, 23, false), "");
1571 denormal = LLVMBuildAdd(ctx->builder, denormal, tmp, "");
1572
1573 /* Select the final result. */
1574 LLVMValueRef result;
1575
1576 tmp = LLVMBuildICmp(ctx->builder, LLVMIntUGE, src,
1577 LLVMConstInt(ctx->i32, ((1 << exp_bits) - 1) << mant_bits, false), "");
1578 result = LLVMBuildSelect(ctx->builder, tmp, naninf, normal, "");
1579
1580 tmp = LLVMBuildICmp(ctx->builder, LLVMIntUGE, src,
1581 LLVMConstInt(ctx->i32, 1 << mant_bits, false), "");
1582 result = LLVMBuildSelect(ctx->builder, tmp, result, denormal, "");
1583
1584 tmp = LLVMBuildICmp(ctx->builder, LLVMIntNE, src, ctx->i32_0, "");
1585 result = LLVMBuildSelect(ctx->builder, tmp, result, ctx->i32_0, "");
1586
1587 return ac_to_float(ctx, result);
1588 }
1589
1590 /**
1591 * Generate a fully general open coded buffer format fetch with all required
1592 * fixups suitable for vertex fetch, using non-format buffer loads.
1593 *
1594 * Some combinations of argument values have special interpretations:
1595 * - size = 8 bytes, format = fixed indicates PIPE_FORMAT_R11G11B10_FLOAT
1596 * - size = 8 bytes, format != {float,fixed} indicates a 2_10_10_10 data format
1597 *
1598 * \param log_size log(size of channel in bytes)
1599 * \param num_channels number of channels (1 to 4)
1600 * \param format AC_FETCH_FORMAT_xxx value
1601 * \param reverse whether XYZ channels are reversed
1602 * \param known_aligned whether the source is known to be aligned to hardware's
1603 * effective element size for loading the given format
1604 * (note: this means dword alignment for 8_8_8_8, 16_16, etc.)
1605 * \param rsrc buffer resource descriptor
1606 * \return the resulting vector of floats or integers bitcast to <4 x i32>
1607 */
1608 LLVMValueRef
1609 ac_build_opencoded_load_format(struct ac_llvm_context *ctx,
1610 unsigned log_size,
1611 unsigned num_channels,
1612 unsigned format,
1613 bool reverse,
1614 bool known_aligned,
1615 LLVMValueRef rsrc,
1616 LLVMValueRef vindex,
1617 LLVMValueRef voffset,
1618 LLVMValueRef soffset,
1619 unsigned cache_policy,
1620 bool can_speculate)
1621 {
1622 LLVMValueRef tmp;
1623 unsigned load_log_size = log_size;
1624 unsigned load_num_channels = num_channels;
1625 if (log_size == 3) {
1626 load_log_size = 2;
1627 if (format == AC_FETCH_FORMAT_FLOAT) {
1628 load_num_channels = 2 * num_channels;
1629 } else {
1630 load_num_channels = 1; /* 10_11_11 or 2_10_10_10 */
1631 }
1632 }
1633
1634 int log_recombine = 0;
1635 if (ctx->chip_class == GFX6 && !known_aligned) {
1636 /* Avoid alignment restrictions by loading one byte at a time. */
1637 load_num_channels <<= load_log_size;
1638 log_recombine = load_log_size;
1639 load_log_size = 0;
1640 } else if (load_num_channels == 2 || load_num_channels == 4) {
1641 log_recombine = -util_logbase2(load_num_channels);
1642 load_num_channels = 1;
1643 load_log_size += -log_recombine;
1644 }
1645
1646 assert(load_log_size >= 2 || LLVM_VERSION_MAJOR >= 9);
1647
1648 LLVMValueRef loads[32]; /* up to 32 bytes */
1649 for (unsigned i = 0; i < load_num_channels; ++i) {
1650 tmp = LLVMBuildAdd(ctx->builder, soffset,
1651 LLVMConstInt(ctx->i32, i << load_log_size, false), "");
1652 LLVMTypeRef channel_type = load_log_size == 0 ? ctx->i8 :
1653 load_log_size == 1 ? ctx->i16 : ctx->i32;
1654 unsigned num_channels = 1 << (MAX2(load_log_size, 2) - 2);
1655 loads[i] = ac_build_buffer_load_common(
1656 ctx, rsrc, vindex, voffset, tmp,
1657 num_channels, channel_type, cache_policy,
1658 can_speculate, false, true);
1659 if (load_log_size >= 2)
1660 loads[i] = ac_to_integer(ctx, loads[i]);
1661 }
1662
1663 if (log_recombine > 0) {
1664 /* Recombine bytes if necessary (GFX6 only) */
1665 LLVMTypeRef dst_type = log_recombine == 2 ? ctx->i32 : ctx->i16;
1666
1667 for (unsigned src = 0, dst = 0; src < load_num_channels; ++dst) {
1668 LLVMValueRef accum = NULL;
1669 for (unsigned i = 0; i < (1 << log_recombine); ++i, ++src) {
1670 tmp = LLVMBuildZExt(ctx->builder, loads[src], dst_type, "");
1671 if (i == 0) {
1672 accum = tmp;
1673 } else {
1674 tmp = LLVMBuildShl(ctx->builder, tmp,
1675 LLVMConstInt(dst_type, 8 * i, false), "");
1676 accum = LLVMBuildOr(ctx->builder, accum, tmp, "");
1677 }
1678 }
1679 loads[dst] = accum;
1680 }
1681 } else if (log_recombine < 0) {
1682 /* Split vectors of dwords */
1683 if (load_log_size > 2) {
1684 assert(load_num_channels == 1);
1685 LLVMValueRef loaded = loads[0];
1686 unsigned log_split = load_log_size - 2;
1687 log_recombine += log_split;
1688 load_num_channels = 1 << log_split;
1689 load_log_size = 2;
1690 for (unsigned i = 0; i < load_num_channels; ++i) {
1691 tmp = LLVMConstInt(ctx->i32, i, false);
1692 loads[i] = LLVMBuildExtractElement(ctx->builder, loaded, tmp, "");
1693 }
1694 }
1695
1696 /* Further split dwords and shorts if required */
1697 if (log_recombine < 0) {
1698 for (unsigned src = load_num_channels,
1699 dst = load_num_channels << -log_recombine;
1700 src > 0; --src) {
1701 unsigned dst_bits = 1 << (3 + load_log_size + log_recombine);
1702 LLVMTypeRef dst_type = LLVMIntTypeInContext(ctx->context, dst_bits);
1703 LLVMValueRef loaded = loads[src - 1];
1704 LLVMTypeRef loaded_type = LLVMTypeOf(loaded);
1705 for (unsigned i = 1 << -log_recombine; i > 0; --i, --dst) {
1706 tmp = LLVMConstInt(loaded_type, dst_bits * (i - 1), false);
1707 tmp = LLVMBuildLShr(ctx->builder, loaded, tmp, "");
1708 loads[dst - 1] = LLVMBuildTrunc(ctx->builder, tmp, dst_type, "");
1709 }
1710 }
1711 }
1712 }
1713
1714 if (log_size == 3) {
1715 if (format == AC_FETCH_FORMAT_FLOAT) {
1716 for (unsigned i = 0; i < num_channels; ++i) {
1717 tmp = ac_build_gather_values(ctx, &loads[2 * i], 2);
1718 loads[i] = LLVMBuildBitCast(ctx->builder, tmp, ctx->f64, "");
1719 }
1720 } else if (format == AC_FETCH_FORMAT_FIXED) {
1721 /* 10_11_11_FLOAT */
1722 LLVMValueRef data = loads[0];
1723 LLVMValueRef i32_2047 = LLVMConstInt(ctx->i32, 2047, false);
1724 LLVMValueRef r = LLVMBuildAnd(ctx->builder, data, i32_2047, "");
1725 tmp = LLVMBuildLShr(ctx->builder, data, LLVMConstInt(ctx->i32, 11, false), "");
1726 LLVMValueRef g = LLVMBuildAnd(ctx->builder, tmp, i32_2047, "");
1727 LLVMValueRef b = LLVMBuildLShr(ctx->builder, data, LLVMConstInt(ctx->i32, 22, false), "");
1728
1729 loads[0] = ac_to_integer(ctx, ac_ufN_to_float(ctx, r, 5, 6));
1730 loads[1] = ac_to_integer(ctx, ac_ufN_to_float(ctx, g, 5, 6));
1731 loads[2] = ac_to_integer(ctx, ac_ufN_to_float(ctx, b, 5, 5));
1732
1733 num_channels = 3;
1734 log_size = 2;
1735 format = AC_FETCH_FORMAT_FLOAT;
1736 } else {
1737 /* 2_10_10_10 data formats */
1738 LLVMValueRef data = loads[0];
1739 LLVMTypeRef i10 = LLVMIntTypeInContext(ctx->context, 10);
1740 LLVMTypeRef i2 = LLVMIntTypeInContext(ctx->context, 2);
1741 loads[0] = LLVMBuildTrunc(ctx->builder, data, i10, "");
1742 tmp = LLVMBuildLShr(ctx->builder, data, LLVMConstInt(ctx->i32, 10, false), "");
1743 loads[1] = LLVMBuildTrunc(ctx->builder, tmp, i10, "");
1744 tmp = LLVMBuildLShr(ctx->builder, data, LLVMConstInt(ctx->i32, 20, false), "");
1745 loads[2] = LLVMBuildTrunc(ctx->builder, tmp, i10, "");
1746 tmp = LLVMBuildLShr(ctx->builder, data, LLVMConstInt(ctx->i32, 30, false), "");
1747 loads[3] = LLVMBuildTrunc(ctx->builder, tmp, i2, "");
1748
1749 num_channels = 4;
1750 }
1751 }
1752
1753 if (format == AC_FETCH_FORMAT_FLOAT) {
1754 if (log_size != 2) {
1755 for (unsigned chan = 0; chan < num_channels; ++chan) {
1756 tmp = ac_to_float(ctx, loads[chan]);
1757 if (log_size == 3)
1758 tmp = LLVMBuildFPTrunc(ctx->builder, tmp, ctx->f32, "");
1759 else if (log_size == 1)
1760 tmp = LLVMBuildFPExt(ctx->builder, tmp, ctx->f32, "");
1761 loads[chan] = ac_to_integer(ctx, tmp);
1762 }
1763 }
1764 } else if (format == AC_FETCH_FORMAT_UINT) {
1765 if (log_size != 2) {
1766 for (unsigned chan = 0; chan < num_channels; ++chan)
1767 loads[chan] = LLVMBuildZExt(ctx->builder, loads[chan], ctx->i32, "");
1768 }
1769 } else if (format == AC_FETCH_FORMAT_SINT) {
1770 if (log_size != 2) {
1771 for (unsigned chan = 0; chan < num_channels; ++chan)
1772 loads[chan] = LLVMBuildSExt(ctx->builder, loads[chan], ctx->i32, "");
1773 }
1774 } else {
1775 bool unsign = format == AC_FETCH_FORMAT_UNORM ||
1776 format == AC_FETCH_FORMAT_USCALED ||
1777 format == AC_FETCH_FORMAT_UINT;
1778
1779 for (unsigned chan = 0; chan < num_channels; ++chan) {
1780 if (unsign) {
1781 tmp = LLVMBuildUIToFP(ctx->builder, loads[chan], ctx->f32, "");
1782 } else {
1783 tmp = LLVMBuildSIToFP(ctx->builder, loads[chan], ctx->f32, "");
1784 }
1785
1786 LLVMValueRef scale = NULL;
1787 if (format == AC_FETCH_FORMAT_FIXED) {
1788 assert(log_size == 2);
1789 scale = LLVMConstReal(ctx->f32, 1.0 / 0x10000);
1790 } else if (format == AC_FETCH_FORMAT_UNORM) {
1791 unsigned bits = LLVMGetIntTypeWidth(LLVMTypeOf(loads[chan]));
1792 scale = LLVMConstReal(ctx->f32, 1.0 / (((uint64_t)1 << bits) - 1));
1793 } else if (format == AC_FETCH_FORMAT_SNORM) {
1794 unsigned bits = LLVMGetIntTypeWidth(LLVMTypeOf(loads[chan]));
1795 scale = LLVMConstReal(ctx->f32, 1.0 / (((uint64_t)1 << (bits - 1)) - 1));
1796 }
1797 if (scale)
1798 tmp = LLVMBuildFMul(ctx->builder, tmp, scale, "");
1799
1800 if (format == AC_FETCH_FORMAT_SNORM) {
1801 /* Clamp to [-1, 1] */
1802 LLVMValueRef neg_one = LLVMConstReal(ctx->f32, -1.0);
1803 LLVMValueRef clamp =
1804 LLVMBuildFCmp(ctx->builder, LLVMRealULT, tmp, neg_one, "");
1805 tmp = LLVMBuildSelect(ctx->builder, clamp, neg_one, tmp, "");
1806 }
1807
1808 loads[chan] = ac_to_integer(ctx, tmp);
1809 }
1810 }
1811
1812 while (num_channels < 4) {
1813 if (format == AC_FETCH_FORMAT_UINT || format == AC_FETCH_FORMAT_SINT) {
1814 loads[num_channels] = num_channels == 3 ? ctx->i32_1 : ctx->i32_0;
1815 } else {
1816 loads[num_channels] = ac_to_integer(ctx, num_channels == 3 ? ctx->f32_1 : ctx->f32_0);
1817 }
1818 num_channels++;
1819 }
1820
1821 if (reverse) {
1822 tmp = loads[0];
1823 loads[0] = loads[2];
1824 loads[2] = tmp;
1825 }
1826
1827 return ac_build_gather_values(ctx, loads, 4);
1828 }
1829
1830 static void
1831 ac_build_tbuffer_store(struct ac_llvm_context *ctx,
1832 LLVMValueRef rsrc,
1833 LLVMValueRef vdata,
1834 LLVMValueRef vindex,
1835 LLVMValueRef voffset,
1836 LLVMValueRef soffset,
1837 LLVMValueRef immoffset,
1838 unsigned num_channels,
1839 unsigned dfmt,
1840 unsigned nfmt,
1841 unsigned cache_policy,
1842 bool structurized)
1843 {
1844 voffset = LLVMBuildAdd(ctx->builder, voffset ? voffset : ctx->i32_0,
1845 immoffset, "");
1846
1847 LLVMValueRef args[7];
1848 int idx = 0;
1849 args[idx++] = vdata;
1850 args[idx++] = LLVMBuildBitCast(ctx->builder, rsrc, ctx->v4i32, "");
1851 if (structurized)
1852 args[idx++] = vindex ? vindex : ctx->i32_0;
1853 args[idx++] = voffset ? voffset : ctx->i32_0;
1854 args[idx++] = soffset ? soffset : ctx->i32_0;
1855 args[idx++] = LLVMConstInt(ctx->i32, ac_get_tbuffer_format(ctx->chip_class, dfmt, nfmt), 0);
1856 args[idx++] = LLVMConstInt(ctx->i32, cache_policy, 0);
1857 unsigned func = !ac_has_vec3_support(ctx->chip_class, true) && num_channels == 3 ? 4 : num_channels;
1858 const char *indexing_kind = structurized ? "struct" : "raw";
1859 char name[256], type_name[8];
1860
1861 LLVMTypeRef type = func > 1 ? LLVMVectorType(ctx->i32, func) : ctx->i32;
1862 ac_build_type_name_for_intr(type, type_name, sizeof(type_name));
1863
1864 snprintf(name, sizeof(name), "llvm.amdgcn.%s.tbuffer.store.%s",
1865 indexing_kind, type_name);
1866
1867 ac_build_intrinsic(ctx, name, ctx->voidt, args, idx,
1868 AC_FUNC_ATTR_INACCESSIBLE_MEM_ONLY);
1869 }
1870
1871 void
1872 ac_build_struct_tbuffer_store(struct ac_llvm_context *ctx,
1873 LLVMValueRef rsrc,
1874 LLVMValueRef vdata,
1875 LLVMValueRef vindex,
1876 LLVMValueRef voffset,
1877 LLVMValueRef soffset,
1878 LLVMValueRef immoffset,
1879 unsigned num_channels,
1880 unsigned dfmt,
1881 unsigned nfmt,
1882 unsigned cache_policy)
1883 {
1884 ac_build_tbuffer_store(ctx, rsrc, vdata, vindex, voffset, soffset,
1885 immoffset, num_channels, dfmt, nfmt, cache_policy,
1886 true);
1887 }
1888
1889 void
1890 ac_build_raw_tbuffer_store(struct ac_llvm_context *ctx,
1891 LLVMValueRef rsrc,
1892 LLVMValueRef vdata,
1893 LLVMValueRef voffset,
1894 LLVMValueRef soffset,
1895 LLVMValueRef immoffset,
1896 unsigned num_channels,
1897 unsigned dfmt,
1898 unsigned nfmt,
1899 unsigned cache_policy)
1900 {
1901 ac_build_tbuffer_store(ctx, rsrc, vdata, NULL, voffset, soffset,
1902 immoffset, num_channels, dfmt, nfmt, cache_policy,
1903 false);
1904 }
1905
1906 void
1907 ac_build_tbuffer_store_short(struct ac_llvm_context *ctx,
1908 LLVMValueRef rsrc,
1909 LLVMValueRef vdata,
1910 LLVMValueRef voffset,
1911 LLVMValueRef soffset,
1912 unsigned cache_policy)
1913 {
1914 vdata = LLVMBuildBitCast(ctx->builder, vdata, ctx->i16, "");
1915
1916 if (LLVM_VERSION_MAJOR >= 9) {
1917 /* LLVM 9+ supports i8/i16 with struct/raw intrinsics. */
1918 ac_build_buffer_store_common(ctx, rsrc, vdata, NULL,
1919 voffset, soffset, 1,
1920 ctx->i16, cache_policy,
1921 false, false);
1922 } else {
1923 unsigned dfmt = V_008F0C_BUF_DATA_FORMAT_16;
1924 unsigned nfmt = V_008F0C_BUF_NUM_FORMAT_UINT;
1925
1926 vdata = LLVMBuildZExt(ctx->builder, vdata, ctx->i32, "");
1927
1928 ac_build_raw_tbuffer_store(ctx, rsrc, vdata, voffset, soffset,
1929 ctx->i32_0, 1, dfmt, nfmt, cache_policy);
1930 }
1931 }
1932
1933 void
1934 ac_build_tbuffer_store_byte(struct ac_llvm_context *ctx,
1935 LLVMValueRef rsrc,
1936 LLVMValueRef vdata,
1937 LLVMValueRef voffset,
1938 LLVMValueRef soffset,
1939 unsigned cache_policy)
1940 {
1941 vdata = LLVMBuildBitCast(ctx->builder, vdata, ctx->i8, "");
1942
1943 if (LLVM_VERSION_MAJOR >= 9) {
1944 /* LLVM 9+ supports i8/i16 with struct/raw intrinsics. */
1945 ac_build_buffer_store_common(ctx, rsrc, vdata, NULL,
1946 voffset, soffset, 1,
1947 ctx->i8, cache_policy,
1948 false, false);
1949 } else {
1950 unsigned dfmt = V_008F0C_BUF_DATA_FORMAT_8;
1951 unsigned nfmt = V_008F0C_BUF_NUM_FORMAT_UINT;
1952
1953 vdata = LLVMBuildZExt(ctx->builder, vdata, ctx->i32, "");
1954
1955 ac_build_raw_tbuffer_store(ctx, rsrc, vdata, voffset, soffset,
1956 ctx->i32_0, 1, dfmt, nfmt, cache_policy);
1957 }
1958 }
1959 /**
1960 * Set range metadata on an instruction. This can only be used on load and
1961 * call instructions. If you know an instruction can only produce the values
1962 * 0, 1, 2, you would do set_range_metadata(value, 0, 3);
1963 * \p lo is the minimum value inclusive.
1964 * \p hi is the maximum value exclusive.
1965 */
1966 static void set_range_metadata(struct ac_llvm_context *ctx,
1967 LLVMValueRef value, unsigned lo, unsigned hi)
1968 {
1969 LLVMValueRef range_md, md_args[2];
1970 LLVMTypeRef type = LLVMTypeOf(value);
1971 LLVMContextRef context = LLVMGetTypeContext(type);
1972
1973 md_args[0] = LLVMConstInt(type, lo, false);
1974 md_args[1] = LLVMConstInt(type, hi, false);
1975 range_md = LLVMMDNodeInContext(context, md_args, 2);
1976 LLVMSetMetadata(value, ctx->range_md_kind, range_md);
1977 }
1978
1979 LLVMValueRef
1980 ac_get_thread_id(struct ac_llvm_context *ctx)
1981 {
1982 LLVMValueRef tid;
1983
1984 LLVMValueRef tid_args[2];
1985 tid_args[0] = LLVMConstInt(ctx->i32, 0xffffffff, false);
1986 tid_args[1] = ctx->i32_0;
1987 tid_args[1] = ac_build_intrinsic(ctx,
1988 "llvm.amdgcn.mbcnt.lo", ctx->i32,
1989 tid_args, 2, AC_FUNC_ATTR_READNONE);
1990
1991 if (ctx->wave_size == 32) {
1992 tid = tid_args[1];
1993 } else {
1994 tid = ac_build_intrinsic(ctx, "llvm.amdgcn.mbcnt.hi",
1995 ctx->i32, tid_args,
1996 2, AC_FUNC_ATTR_READNONE);
1997 }
1998 set_range_metadata(ctx, tid, 0, ctx->wave_size);
1999 return tid;
2000 }
2001
2002 /*
2003 * AMD GCN implements derivatives using the local data store (LDS)
2004 * All writes to the LDS happen in all executing threads at
2005 * the same time. TID is the Thread ID for the current
2006 * thread and is a value between 0 and 63, representing
2007 * the thread's position in the wavefront.
2008 *
2009 * For the pixel shader threads are grouped into quads of four pixels.
2010 * The TIDs of the pixels of a quad are:
2011 *
2012 * +------+------+
2013 * |4n + 0|4n + 1|
2014 * +------+------+
2015 * |4n + 2|4n + 3|
2016 * +------+------+
2017 *
2018 * So, masking the TID with 0xfffffffc yields the TID of the top left pixel
2019 * of the quad, masking with 0xfffffffd yields the TID of the top pixel of
2020 * the current pixel's column, and masking with 0xfffffffe yields the TID
2021 * of the left pixel of the current pixel's row.
2022 *
2023 * Adding 1 yields the TID of the pixel to the right of the left pixel, and
2024 * adding 2 yields the TID of the pixel below the top pixel.
2025 */
2026 LLVMValueRef
2027 ac_build_ddxy(struct ac_llvm_context *ctx,
2028 uint32_t mask,
2029 int idx,
2030 LLVMValueRef val)
2031 {
2032 unsigned tl_lanes[4], trbl_lanes[4];
2033 char name[32], type[8];
2034 LLVMValueRef tl, trbl;
2035 LLVMTypeRef result_type;
2036 LLVMValueRef result;
2037
2038 result_type = ac_to_float_type(ctx, LLVMTypeOf(val));
2039
2040 if (result_type == ctx->f16)
2041 val = LLVMBuildZExt(ctx->builder, val, ctx->i32, "");
2042
2043 for (unsigned i = 0; i < 4; ++i) {
2044 tl_lanes[i] = i & mask;
2045 trbl_lanes[i] = (i & mask) + idx;
2046 }
2047
2048 tl = ac_build_quad_swizzle(ctx, val,
2049 tl_lanes[0], tl_lanes[1],
2050 tl_lanes[2], tl_lanes[3]);
2051 trbl = ac_build_quad_swizzle(ctx, val,
2052 trbl_lanes[0], trbl_lanes[1],
2053 trbl_lanes[2], trbl_lanes[3]);
2054
2055 if (result_type == ctx->f16) {
2056 tl = LLVMBuildTrunc(ctx->builder, tl, ctx->i16, "");
2057 trbl = LLVMBuildTrunc(ctx->builder, trbl, ctx->i16, "");
2058 }
2059
2060 tl = LLVMBuildBitCast(ctx->builder, tl, result_type, "");
2061 trbl = LLVMBuildBitCast(ctx->builder, trbl, result_type, "");
2062 result = LLVMBuildFSub(ctx->builder, trbl, tl, "");
2063
2064 ac_build_type_name_for_intr(result_type, type, sizeof(type));
2065 snprintf(name, sizeof(name), "llvm.amdgcn.wqm.%s", type);
2066
2067 return ac_build_intrinsic(ctx, name, result_type, &result, 1, 0);
2068 }
2069
2070 void
2071 ac_build_sendmsg(struct ac_llvm_context *ctx,
2072 uint32_t msg,
2073 LLVMValueRef wave_id)
2074 {
2075 LLVMValueRef args[2];
2076 args[0] = LLVMConstInt(ctx->i32, msg, false);
2077 args[1] = wave_id;
2078 ac_build_intrinsic(ctx, "llvm.amdgcn.s.sendmsg", ctx->voidt, args, 2, 0);
2079 }
2080
2081 LLVMValueRef
2082 ac_build_imsb(struct ac_llvm_context *ctx,
2083 LLVMValueRef arg,
2084 LLVMTypeRef dst_type)
2085 {
2086 LLVMValueRef msb = ac_build_intrinsic(ctx, "llvm.amdgcn.sffbh.i32",
2087 dst_type, &arg, 1,
2088 AC_FUNC_ATTR_READNONE);
2089
2090 /* The HW returns the last bit index from MSB, but NIR/TGSI wants
2091 * the index from LSB. Invert it by doing "31 - msb". */
2092 msb = LLVMBuildSub(ctx->builder, LLVMConstInt(ctx->i32, 31, false),
2093 msb, "");
2094
2095 LLVMValueRef all_ones = LLVMConstInt(ctx->i32, -1, true);
2096 LLVMValueRef cond = LLVMBuildOr(ctx->builder,
2097 LLVMBuildICmp(ctx->builder, LLVMIntEQ,
2098 arg, ctx->i32_0, ""),
2099 LLVMBuildICmp(ctx->builder, LLVMIntEQ,
2100 arg, all_ones, ""), "");
2101
2102 return LLVMBuildSelect(ctx->builder, cond, all_ones, msb, "");
2103 }
2104
2105 LLVMValueRef
2106 ac_build_umsb(struct ac_llvm_context *ctx,
2107 LLVMValueRef arg,
2108 LLVMTypeRef dst_type)
2109 {
2110 const char *intrin_name;
2111 LLVMTypeRef type;
2112 LLVMValueRef highest_bit;
2113 LLVMValueRef zero;
2114 unsigned bitsize;
2115
2116 bitsize = ac_get_elem_bits(ctx, LLVMTypeOf(arg));
2117 switch (bitsize) {
2118 case 64:
2119 intrin_name = "llvm.ctlz.i64";
2120 type = ctx->i64;
2121 highest_bit = LLVMConstInt(ctx->i64, 63, false);
2122 zero = ctx->i64_0;
2123 break;
2124 case 32:
2125 intrin_name = "llvm.ctlz.i32";
2126 type = ctx->i32;
2127 highest_bit = LLVMConstInt(ctx->i32, 31, false);
2128 zero = ctx->i32_0;
2129 break;
2130 case 16:
2131 intrin_name = "llvm.ctlz.i16";
2132 type = ctx->i16;
2133 highest_bit = LLVMConstInt(ctx->i16, 15, false);
2134 zero = ctx->i16_0;
2135 break;
2136 case 8:
2137 intrin_name = "llvm.ctlz.i8";
2138 type = ctx->i8;
2139 highest_bit = LLVMConstInt(ctx->i8, 7, false);
2140 zero = ctx->i8_0;
2141 break;
2142 default:
2143 unreachable(!"invalid bitsize");
2144 break;
2145 }
2146
2147 LLVMValueRef params[2] = {
2148 arg,
2149 ctx->i1true,
2150 };
2151
2152 LLVMValueRef msb = ac_build_intrinsic(ctx, intrin_name, type,
2153 params, 2,
2154 AC_FUNC_ATTR_READNONE);
2155
2156 /* The HW returns the last bit index from MSB, but TGSI/NIR wants
2157 * the index from LSB. Invert it by doing "31 - msb". */
2158 msb = LLVMBuildSub(ctx->builder, highest_bit, msb, "");
2159
2160 if (bitsize == 64) {
2161 msb = LLVMBuildTrunc(ctx->builder, msb, ctx->i32, "");
2162 } else if (bitsize < 32) {
2163 msb = LLVMBuildSExt(ctx->builder, msb, ctx->i32, "");
2164 }
2165
2166 /* check for zero */
2167 return LLVMBuildSelect(ctx->builder,
2168 LLVMBuildICmp(ctx->builder, LLVMIntEQ, arg, zero, ""),
2169 LLVMConstInt(ctx->i32, -1, true), msb, "");
2170 }
2171
2172 LLVMValueRef ac_build_fmin(struct ac_llvm_context *ctx, LLVMValueRef a,
2173 LLVMValueRef b)
2174 {
2175 char name[64];
2176 snprintf(name, sizeof(name), "llvm.minnum.f%d", ac_get_elem_bits(ctx, LLVMTypeOf(a)));
2177 LLVMValueRef args[2] = {a, b};
2178 return ac_build_intrinsic(ctx, name, LLVMTypeOf(a), args, 2,
2179 AC_FUNC_ATTR_READNONE);
2180 }
2181
2182 LLVMValueRef ac_build_fmax(struct ac_llvm_context *ctx, LLVMValueRef a,
2183 LLVMValueRef b)
2184 {
2185 char name[64];
2186 snprintf(name, sizeof(name), "llvm.maxnum.f%d", ac_get_elem_bits(ctx, LLVMTypeOf(a)));
2187 LLVMValueRef args[2] = {a, b};
2188 return ac_build_intrinsic(ctx, name, LLVMTypeOf(a), args, 2,
2189 AC_FUNC_ATTR_READNONE);
2190 }
2191
2192 LLVMValueRef ac_build_imin(struct ac_llvm_context *ctx, LLVMValueRef a,
2193 LLVMValueRef b)
2194 {
2195 LLVMValueRef cmp = LLVMBuildICmp(ctx->builder, LLVMIntSLE, a, b, "");
2196 return LLVMBuildSelect(ctx->builder, cmp, a, b, "");
2197 }
2198
2199 LLVMValueRef ac_build_imax(struct ac_llvm_context *ctx, LLVMValueRef a,
2200 LLVMValueRef b)
2201 {
2202 LLVMValueRef cmp = LLVMBuildICmp(ctx->builder, LLVMIntSGT, a, b, "");
2203 return LLVMBuildSelect(ctx->builder, cmp, a, b, "");
2204 }
2205
2206 LLVMValueRef ac_build_umin(struct ac_llvm_context *ctx, LLVMValueRef a,
2207 LLVMValueRef b)
2208 {
2209 LLVMValueRef cmp = LLVMBuildICmp(ctx->builder, LLVMIntULE, a, b, "");
2210 return LLVMBuildSelect(ctx->builder, cmp, a, b, "");
2211 }
2212
2213 LLVMValueRef ac_build_umax(struct ac_llvm_context *ctx, LLVMValueRef a,
2214 LLVMValueRef b)
2215 {
2216 LLVMValueRef cmp = LLVMBuildICmp(ctx->builder, LLVMIntUGE, a, b, "");
2217 return LLVMBuildSelect(ctx->builder, cmp, a, b, "");
2218 }
2219
2220 LLVMValueRef ac_build_clamp(struct ac_llvm_context *ctx, LLVMValueRef value)
2221 {
2222 LLVMTypeRef t = LLVMTypeOf(value);
2223 return ac_build_fmin(ctx, ac_build_fmax(ctx, value, LLVMConstReal(t, 0.0)),
2224 LLVMConstReal(t, 1.0));
2225 }
2226
2227 void ac_build_export(struct ac_llvm_context *ctx, struct ac_export_args *a)
2228 {
2229 LLVMValueRef args[9];
2230
2231 args[0] = LLVMConstInt(ctx->i32, a->target, 0);
2232 args[1] = LLVMConstInt(ctx->i32, a->enabled_channels, 0);
2233
2234 if (a->compr) {
2235 LLVMTypeRef i16 = LLVMInt16TypeInContext(ctx->context);
2236 LLVMTypeRef v2i16 = LLVMVectorType(i16, 2);
2237
2238 args[2] = LLVMBuildBitCast(ctx->builder, a->out[0],
2239 v2i16, "");
2240 args[3] = LLVMBuildBitCast(ctx->builder, a->out[1],
2241 v2i16, "");
2242 args[4] = LLVMConstInt(ctx->i1, a->done, 0);
2243 args[5] = LLVMConstInt(ctx->i1, a->valid_mask, 0);
2244
2245 ac_build_intrinsic(ctx, "llvm.amdgcn.exp.compr.v2i16",
2246 ctx->voidt, args, 6, 0);
2247 } else {
2248 args[2] = a->out[0];
2249 args[3] = a->out[1];
2250 args[4] = a->out[2];
2251 args[5] = a->out[3];
2252 args[6] = LLVMConstInt(ctx->i1, a->done, 0);
2253 args[7] = LLVMConstInt(ctx->i1, a->valid_mask, 0);
2254
2255 ac_build_intrinsic(ctx, "llvm.amdgcn.exp.f32",
2256 ctx->voidt, args, 8, 0);
2257 }
2258 }
2259
2260 void ac_build_export_null(struct ac_llvm_context *ctx)
2261 {
2262 struct ac_export_args args;
2263
2264 args.enabled_channels = 0x0; /* enabled channels */
2265 args.valid_mask = 1; /* whether the EXEC mask is valid */
2266 args.done = 1; /* DONE bit */
2267 args.target = V_008DFC_SQ_EXP_NULL;
2268 args.compr = 0; /* COMPR flag (0 = 32-bit export) */
2269 args.out[0] = LLVMGetUndef(ctx->f32); /* R */
2270 args.out[1] = LLVMGetUndef(ctx->f32); /* G */
2271 args.out[2] = LLVMGetUndef(ctx->f32); /* B */
2272 args.out[3] = LLVMGetUndef(ctx->f32); /* A */
2273
2274 ac_build_export(ctx, &args);
2275 }
2276
2277 static unsigned ac_num_coords(enum ac_image_dim dim)
2278 {
2279 switch (dim) {
2280 case ac_image_1d:
2281 return 1;
2282 case ac_image_2d:
2283 case ac_image_1darray:
2284 return 2;
2285 case ac_image_3d:
2286 case ac_image_cube:
2287 case ac_image_2darray:
2288 case ac_image_2dmsaa:
2289 return 3;
2290 case ac_image_2darraymsaa:
2291 return 4;
2292 default:
2293 unreachable("ac_num_coords: bad dim");
2294 }
2295 }
2296
2297 static unsigned ac_num_derivs(enum ac_image_dim dim)
2298 {
2299 switch (dim) {
2300 case ac_image_1d:
2301 case ac_image_1darray:
2302 return 2;
2303 case ac_image_2d:
2304 case ac_image_2darray:
2305 case ac_image_cube:
2306 return 4;
2307 case ac_image_3d:
2308 return 6;
2309 case ac_image_2dmsaa:
2310 case ac_image_2darraymsaa:
2311 default:
2312 unreachable("derivatives not supported");
2313 }
2314 }
2315
2316 static const char *get_atomic_name(enum ac_atomic_op op)
2317 {
2318 switch (op) {
2319 case ac_atomic_swap: return "swap";
2320 case ac_atomic_add: return "add";
2321 case ac_atomic_sub: return "sub";
2322 case ac_atomic_smin: return "smin";
2323 case ac_atomic_umin: return "umin";
2324 case ac_atomic_smax: return "smax";
2325 case ac_atomic_umax: return "umax";
2326 case ac_atomic_and: return "and";
2327 case ac_atomic_or: return "or";
2328 case ac_atomic_xor: return "xor";
2329 case ac_atomic_inc_wrap: return "inc";
2330 case ac_atomic_dec_wrap: return "dec";
2331 }
2332 unreachable("bad atomic op");
2333 }
2334
2335 LLVMValueRef ac_build_image_opcode(struct ac_llvm_context *ctx,
2336 struct ac_image_args *a)
2337 {
2338 const char *overload[3] = { "", "", "" };
2339 unsigned num_overloads = 0;
2340 LLVMValueRef args[18];
2341 unsigned num_args = 0;
2342 enum ac_image_dim dim = a->dim;
2343
2344 assert(!a->lod || a->lod == ctx->i32_0 || a->lod == ctx->f32_0 ||
2345 !a->level_zero);
2346 assert((a->opcode != ac_image_get_resinfo && a->opcode != ac_image_load_mip &&
2347 a->opcode != ac_image_store_mip) ||
2348 a->lod);
2349 assert(a->opcode == ac_image_sample || a->opcode == ac_image_gather4 ||
2350 (!a->compare && !a->offset));
2351 assert((a->opcode == ac_image_sample || a->opcode == ac_image_gather4 ||
2352 a->opcode == ac_image_get_lod) ||
2353 !a->bias);
2354 assert((a->bias ? 1 : 0) +
2355 (a->lod ? 1 : 0) +
2356 (a->level_zero ? 1 : 0) +
2357 (a->derivs[0] ? 1 : 0) <= 1);
2358
2359 if (a->opcode == ac_image_get_lod) {
2360 switch (dim) {
2361 case ac_image_1darray:
2362 dim = ac_image_1d;
2363 break;
2364 case ac_image_2darray:
2365 case ac_image_cube:
2366 dim = ac_image_2d;
2367 break;
2368 default:
2369 break;
2370 }
2371 }
2372
2373 bool sample = a->opcode == ac_image_sample ||
2374 a->opcode == ac_image_gather4 ||
2375 a->opcode == ac_image_get_lod;
2376 bool atomic = a->opcode == ac_image_atomic ||
2377 a->opcode == ac_image_atomic_cmpswap;
2378 bool load = a->opcode == ac_image_sample ||
2379 a->opcode == ac_image_gather4 ||
2380 a->opcode == ac_image_load ||
2381 a->opcode == ac_image_load_mip;
2382 LLVMTypeRef coord_type = sample ? ctx->f32 : ctx->i32;
2383
2384 if (atomic || a->opcode == ac_image_store || a->opcode == ac_image_store_mip) {
2385 args[num_args++] = a->data[0];
2386 if (a->opcode == ac_image_atomic_cmpswap)
2387 args[num_args++] = a->data[1];
2388 }
2389
2390 if (!atomic)
2391 args[num_args++] = LLVMConstInt(ctx->i32, a->dmask, false);
2392
2393 if (a->offset)
2394 args[num_args++] = ac_to_integer(ctx, a->offset);
2395 if (a->bias) {
2396 args[num_args++] = ac_to_float(ctx, a->bias);
2397 overload[num_overloads++] = ".f32";
2398 }
2399 if (a->compare)
2400 args[num_args++] = ac_to_float(ctx, a->compare);
2401 if (a->derivs[0]) {
2402 unsigned count = ac_num_derivs(dim);
2403 for (unsigned i = 0; i < count; ++i)
2404 args[num_args++] = ac_to_float(ctx, a->derivs[i]);
2405 overload[num_overloads++] = ".f32";
2406 }
2407 unsigned num_coords =
2408 a->opcode != ac_image_get_resinfo ? ac_num_coords(dim) : 0;
2409 for (unsigned i = 0; i < num_coords; ++i)
2410 args[num_args++] = LLVMBuildBitCast(ctx->builder, a->coords[i], coord_type, "");
2411 if (a->lod)
2412 args[num_args++] = LLVMBuildBitCast(ctx->builder, a->lod, coord_type, "");
2413 overload[num_overloads++] = sample ? ".f32" : ".i32";
2414
2415 args[num_args++] = a->resource;
2416 if (sample) {
2417 args[num_args++] = a->sampler;
2418 args[num_args++] = LLVMConstInt(ctx->i1, a->unorm, false);
2419 }
2420
2421 args[num_args++] = ctx->i32_0; /* texfailctrl */
2422 args[num_args++] = LLVMConstInt(ctx->i32,
2423 load ? get_load_cache_policy(ctx, a->cache_policy) :
2424 a->cache_policy, false);
2425
2426 const char *name;
2427 const char *atomic_subop = "";
2428 switch (a->opcode) {
2429 case ac_image_sample: name = "sample"; break;
2430 case ac_image_gather4: name = "gather4"; break;
2431 case ac_image_load: name = "load"; break;
2432 case ac_image_load_mip: name = "load.mip"; break;
2433 case ac_image_store: name = "store"; break;
2434 case ac_image_store_mip: name = "store.mip"; break;
2435 case ac_image_atomic:
2436 name = "atomic.";
2437 atomic_subop = get_atomic_name(a->atomic);
2438 break;
2439 case ac_image_atomic_cmpswap:
2440 name = "atomic.";
2441 atomic_subop = "cmpswap";
2442 break;
2443 case ac_image_get_lod: name = "getlod"; break;
2444 case ac_image_get_resinfo: name = "getresinfo"; break;
2445 default: unreachable("invalid image opcode");
2446 }
2447
2448 const char *dimname;
2449 switch (dim) {
2450 case ac_image_1d: dimname = "1d"; break;
2451 case ac_image_2d: dimname = "2d"; break;
2452 case ac_image_3d: dimname = "3d"; break;
2453 case ac_image_cube: dimname = "cube"; break;
2454 case ac_image_1darray: dimname = "1darray"; break;
2455 case ac_image_2darray: dimname = "2darray"; break;
2456 case ac_image_2dmsaa: dimname = "2dmsaa"; break;
2457 case ac_image_2darraymsaa: dimname = "2darraymsaa"; break;
2458 default: unreachable("invalid dim");
2459 }
2460
2461 bool lod_suffix =
2462 a->lod && (a->opcode == ac_image_sample || a->opcode == ac_image_gather4);
2463 char intr_name[96];
2464 snprintf(intr_name, sizeof(intr_name),
2465 "llvm.amdgcn.image.%s%s" /* base name */
2466 "%s%s%s" /* sample/gather modifiers */
2467 ".%s.%s%s%s%s", /* dimension and type overloads */
2468 name, atomic_subop,
2469 a->compare ? ".c" : "",
2470 a->bias ? ".b" :
2471 lod_suffix ? ".l" :
2472 a->derivs[0] ? ".d" :
2473 a->level_zero ? ".lz" : "",
2474 a->offset ? ".o" : "",
2475 dimname,
2476 atomic ? "i32" : "v4f32",
2477 overload[0], overload[1], overload[2]);
2478
2479 LLVMTypeRef retty;
2480 if (atomic)
2481 retty = ctx->i32;
2482 else if (a->opcode == ac_image_store || a->opcode == ac_image_store_mip)
2483 retty = ctx->voidt;
2484 else
2485 retty = ctx->v4f32;
2486
2487 LLVMValueRef result =
2488 ac_build_intrinsic(ctx, intr_name, retty, args, num_args,
2489 a->attributes);
2490 if (!sample && retty == ctx->v4f32) {
2491 result = LLVMBuildBitCast(ctx->builder, result,
2492 ctx->v4i32, "");
2493 }
2494 return result;
2495 }
2496
2497 LLVMValueRef ac_build_image_get_sample_count(struct ac_llvm_context *ctx,
2498 LLVMValueRef rsrc)
2499 {
2500 LLVMValueRef samples;
2501
2502 /* Read the samples from the descriptor directly.
2503 * Hardware doesn't have any instruction for this.
2504 */
2505 samples = LLVMBuildExtractElement(ctx->builder, rsrc,
2506 LLVMConstInt(ctx->i32, 3, 0), "");
2507 samples = LLVMBuildLShr(ctx->builder, samples,
2508 LLVMConstInt(ctx->i32, 16, 0), "");
2509 samples = LLVMBuildAnd(ctx->builder, samples,
2510 LLVMConstInt(ctx->i32, 0xf, 0), "");
2511 samples = LLVMBuildShl(ctx->builder, ctx->i32_1,
2512 samples, "");
2513 return samples;
2514 }
2515
2516 LLVMValueRef ac_build_cvt_pkrtz_f16(struct ac_llvm_context *ctx,
2517 LLVMValueRef args[2])
2518 {
2519 LLVMTypeRef v2f16 =
2520 LLVMVectorType(LLVMHalfTypeInContext(ctx->context), 2);
2521
2522 return ac_build_intrinsic(ctx, "llvm.amdgcn.cvt.pkrtz", v2f16,
2523 args, 2, AC_FUNC_ATTR_READNONE);
2524 }
2525
2526 LLVMValueRef ac_build_cvt_pknorm_i16(struct ac_llvm_context *ctx,
2527 LLVMValueRef args[2])
2528 {
2529 LLVMValueRef res =
2530 ac_build_intrinsic(ctx, "llvm.amdgcn.cvt.pknorm.i16",
2531 ctx->v2i16, args, 2,
2532 AC_FUNC_ATTR_READNONE);
2533 return LLVMBuildBitCast(ctx->builder, res, ctx->i32, "");
2534 }
2535
2536 LLVMValueRef ac_build_cvt_pknorm_u16(struct ac_llvm_context *ctx,
2537 LLVMValueRef args[2])
2538 {
2539 LLVMValueRef res =
2540 ac_build_intrinsic(ctx, "llvm.amdgcn.cvt.pknorm.u16",
2541 ctx->v2i16, args, 2,
2542 AC_FUNC_ATTR_READNONE);
2543 return LLVMBuildBitCast(ctx->builder, res, ctx->i32, "");
2544 }
2545
2546 /* The 8-bit and 10-bit clamping is for HW workarounds. */
2547 LLVMValueRef ac_build_cvt_pk_i16(struct ac_llvm_context *ctx,
2548 LLVMValueRef args[2], unsigned bits, bool hi)
2549 {
2550 assert(bits == 8 || bits == 10 || bits == 16);
2551
2552 LLVMValueRef max_rgb = LLVMConstInt(ctx->i32,
2553 bits == 8 ? 127 : bits == 10 ? 511 : 32767, 0);
2554 LLVMValueRef min_rgb = LLVMConstInt(ctx->i32,
2555 bits == 8 ? -128 : bits == 10 ? -512 : -32768, 0);
2556 LLVMValueRef max_alpha =
2557 bits != 10 ? max_rgb : ctx->i32_1;
2558 LLVMValueRef min_alpha =
2559 bits != 10 ? min_rgb : LLVMConstInt(ctx->i32, -2, 0);
2560
2561 /* Clamp. */
2562 if (bits != 16) {
2563 for (int i = 0; i < 2; i++) {
2564 bool alpha = hi && i == 1;
2565 args[i] = ac_build_imin(ctx, args[i],
2566 alpha ? max_alpha : max_rgb);
2567 args[i] = ac_build_imax(ctx, args[i],
2568 alpha ? min_alpha : min_rgb);
2569 }
2570 }
2571
2572 LLVMValueRef res =
2573 ac_build_intrinsic(ctx, "llvm.amdgcn.cvt.pk.i16",
2574 ctx->v2i16, args, 2,
2575 AC_FUNC_ATTR_READNONE);
2576 return LLVMBuildBitCast(ctx->builder, res, ctx->i32, "");
2577 }
2578
2579 /* The 8-bit and 10-bit clamping is for HW workarounds. */
2580 LLVMValueRef ac_build_cvt_pk_u16(struct ac_llvm_context *ctx,
2581 LLVMValueRef args[2], unsigned bits, bool hi)
2582 {
2583 assert(bits == 8 || bits == 10 || bits == 16);
2584
2585 LLVMValueRef max_rgb = LLVMConstInt(ctx->i32,
2586 bits == 8 ? 255 : bits == 10 ? 1023 : 65535, 0);
2587 LLVMValueRef max_alpha =
2588 bits != 10 ? max_rgb : LLVMConstInt(ctx->i32, 3, 0);
2589
2590 /* Clamp. */
2591 if (bits != 16) {
2592 for (int i = 0; i < 2; i++) {
2593 bool alpha = hi && i == 1;
2594 args[i] = ac_build_umin(ctx, args[i],
2595 alpha ? max_alpha : max_rgb);
2596 }
2597 }
2598
2599 LLVMValueRef res =
2600 ac_build_intrinsic(ctx, "llvm.amdgcn.cvt.pk.u16",
2601 ctx->v2i16, args, 2,
2602 AC_FUNC_ATTR_READNONE);
2603 return LLVMBuildBitCast(ctx->builder, res, ctx->i32, "");
2604 }
2605
2606 LLVMValueRef ac_build_wqm_vote(struct ac_llvm_context *ctx, LLVMValueRef i1)
2607 {
2608 return ac_build_intrinsic(ctx, "llvm.amdgcn.wqm.vote", ctx->i1,
2609 &i1, 1, AC_FUNC_ATTR_READNONE);
2610 }
2611
2612 void ac_build_kill_if_false(struct ac_llvm_context *ctx, LLVMValueRef i1)
2613 {
2614 ac_build_intrinsic(ctx, "llvm.amdgcn.kill", ctx->voidt,
2615 &i1, 1, 0);
2616 }
2617
2618 LLVMValueRef ac_build_bfe(struct ac_llvm_context *ctx, LLVMValueRef input,
2619 LLVMValueRef offset, LLVMValueRef width,
2620 bool is_signed)
2621 {
2622 LLVMValueRef args[] = {
2623 input,
2624 offset,
2625 width,
2626 };
2627
2628 return ac_build_intrinsic(ctx, is_signed ? "llvm.amdgcn.sbfe.i32" :
2629 "llvm.amdgcn.ubfe.i32",
2630 ctx->i32, args, 3, AC_FUNC_ATTR_READNONE);
2631
2632 }
2633
2634 LLVMValueRef ac_build_imad(struct ac_llvm_context *ctx, LLVMValueRef s0,
2635 LLVMValueRef s1, LLVMValueRef s2)
2636 {
2637 return LLVMBuildAdd(ctx->builder,
2638 LLVMBuildMul(ctx->builder, s0, s1, ""), s2, "");
2639 }
2640
2641 LLVMValueRef ac_build_fmad(struct ac_llvm_context *ctx, LLVMValueRef s0,
2642 LLVMValueRef s1, LLVMValueRef s2)
2643 {
2644 /* FMA is better on GFX10, because it has FMA units instead of MUL-ADD units. */
2645 if (ctx->chip_class >= GFX10) {
2646 return ac_build_intrinsic(ctx, "llvm.fma.f32", ctx->f32,
2647 (LLVMValueRef []) {s0, s1, s2}, 3,
2648 AC_FUNC_ATTR_READNONE);
2649 }
2650
2651 return LLVMBuildFAdd(ctx->builder,
2652 LLVMBuildFMul(ctx->builder, s0, s1, ""), s2, "");
2653 }
2654
2655 void ac_build_waitcnt(struct ac_llvm_context *ctx, unsigned wait_flags)
2656 {
2657 if (!wait_flags)
2658 return;
2659
2660 unsigned lgkmcnt = 63;
2661 unsigned vmcnt = ctx->chip_class >= GFX9 ? 63 : 15;
2662 unsigned vscnt = 63;
2663
2664 if (wait_flags & AC_WAIT_LGKM)
2665 lgkmcnt = 0;
2666 if (wait_flags & AC_WAIT_VLOAD)
2667 vmcnt = 0;
2668
2669 if (wait_flags & AC_WAIT_VSTORE) {
2670 if (ctx->chip_class >= GFX10)
2671 vscnt = 0;
2672 else
2673 vmcnt = 0;
2674 }
2675
2676 /* There is no intrinsic for vscnt(0), so use a fence. */
2677 if ((wait_flags & AC_WAIT_LGKM &&
2678 wait_flags & AC_WAIT_VLOAD &&
2679 wait_flags & AC_WAIT_VSTORE) ||
2680 vscnt == 0) {
2681 LLVMBuildFence(ctx->builder, LLVMAtomicOrderingRelease, false, "");
2682 return;
2683 }
2684
2685 unsigned simm16 = (lgkmcnt << 8) |
2686 (7 << 4) | /* expcnt */
2687 (vmcnt & 0xf) |
2688 ((vmcnt >> 4) << 14);
2689
2690 LLVMValueRef args[1] = {
2691 LLVMConstInt(ctx->i32, simm16, false),
2692 };
2693 ac_build_intrinsic(ctx, "llvm.amdgcn.s.waitcnt",
2694 ctx->voidt, args, 1, 0);
2695 }
2696
2697 LLVMValueRef ac_build_fmed3(struct ac_llvm_context *ctx, LLVMValueRef src0,
2698 LLVMValueRef src1, LLVMValueRef src2,
2699 unsigned bitsize)
2700 {
2701 LLVMTypeRef type;
2702 char *intr;
2703
2704 if (bitsize == 16) {
2705 intr = "llvm.amdgcn.fmed3.f16";
2706 type = ctx->f16;
2707 } else if (bitsize == 32) {
2708 intr = "llvm.amdgcn.fmed3.f32";
2709 type = ctx->f32;
2710 } else {
2711 intr = "llvm.amdgcn.fmed3.f64";
2712 type = ctx->f64;
2713 }
2714
2715 LLVMValueRef params[] = {
2716 src0,
2717 src1,
2718 src2,
2719 };
2720 return ac_build_intrinsic(ctx, intr, type, params, 3,
2721 AC_FUNC_ATTR_READNONE);
2722 }
2723
2724 LLVMValueRef ac_build_fract(struct ac_llvm_context *ctx, LLVMValueRef src0,
2725 unsigned bitsize)
2726 {
2727 LLVMTypeRef type;
2728 char *intr;
2729
2730 if (bitsize == 16) {
2731 intr = "llvm.amdgcn.fract.f16";
2732 type = ctx->f16;
2733 } else if (bitsize == 32) {
2734 intr = "llvm.amdgcn.fract.f32";
2735 type = ctx->f32;
2736 } else {
2737 intr = "llvm.amdgcn.fract.f64";
2738 type = ctx->f64;
2739 }
2740
2741 LLVMValueRef params[] = {
2742 src0,
2743 };
2744 return ac_build_intrinsic(ctx, intr, type, params, 1,
2745 AC_FUNC_ATTR_READNONE);
2746 }
2747
2748 LLVMValueRef ac_build_isign(struct ac_llvm_context *ctx, LLVMValueRef src0,
2749 unsigned bitsize)
2750 {
2751 LLVMTypeRef type = LLVMIntTypeInContext(ctx->context, bitsize);
2752 LLVMValueRef zero = LLVMConstInt(type, 0, false);
2753 LLVMValueRef one = LLVMConstInt(type, 1, false);
2754
2755 LLVMValueRef cmp, val;
2756 cmp = LLVMBuildICmp(ctx->builder, LLVMIntSGT, src0, zero, "");
2757 val = LLVMBuildSelect(ctx->builder, cmp, one, src0, "");
2758 cmp = LLVMBuildICmp(ctx->builder, LLVMIntSGE, val, zero, "");
2759 val = LLVMBuildSelect(ctx->builder, cmp, val, LLVMConstInt(type, -1, true), "");
2760 return val;
2761 }
2762
2763 LLVMValueRef ac_build_fsign(struct ac_llvm_context *ctx, LLVMValueRef src0,
2764 unsigned bitsize)
2765 {
2766 LLVMValueRef cmp, val, zero, one;
2767 LLVMTypeRef type;
2768
2769 if (bitsize == 16) {
2770 type = ctx->f16;
2771 zero = ctx->f16_0;
2772 one = ctx->f16_1;
2773 } else if (bitsize == 32) {
2774 type = ctx->f32;
2775 zero = ctx->f32_0;
2776 one = ctx->f32_1;
2777 } else {
2778 type = ctx->f64;
2779 zero = ctx->f64_0;
2780 one = ctx->f64_1;
2781 }
2782
2783 cmp = LLVMBuildFCmp(ctx->builder, LLVMRealOGT, src0, zero, "");
2784 val = LLVMBuildSelect(ctx->builder, cmp, one, src0, "");
2785 cmp = LLVMBuildFCmp(ctx->builder, LLVMRealOGE, val, zero, "");
2786 val = LLVMBuildSelect(ctx->builder, cmp, val, LLVMConstReal(type, -1.0), "");
2787 return val;
2788 }
2789
2790 LLVMValueRef ac_build_bit_count(struct ac_llvm_context *ctx, LLVMValueRef src0)
2791 {
2792 LLVMValueRef result;
2793 unsigned bitsize;
2794
2795 bitsize = ac_get_elem_bits(ctx, LLVMTypeOf(src0));
2796
2797 switch (bitsize) {
2798 case 64:
2799 result = ac_build_intrinsic(ctx, "llvm.ctpop.i64", ctx->i64,
2800 (LLVMValueRef []) { src0 }, 1,
2801 AC_FUNC_ATTR_READNONE);
2802
2803 result = LLVMBuildTrunc(ctx->builder, result, ctx->i32, "");
2804 break;
2805 case 32:
2806 result = ac_build_intrinsic(ctx, "llvm.ctpop.i32", ctx->i32,
2807 (LLVMValueRef []) { src0 }, 1,
2808 AC_FUNC_ATTR_READNONE);
2809 break;
2810 case 16:
2811 result = ac_build_intrinsic(ctx, "llvm.ctpop.i16", ctx->i16,
2812 (LLVMValueRef []) { src0 }, 1,
2813 AC_FUNC_ATTR_READNONE);
2814
2815 result = LLVMBuildZExt(ctx->builder, result, ctx->i32, "");
2816 break;
2817 case 8:
2818 result = ac_build_intrinsic(ctx, "llvm.ctpop.i8", ctx->i8,
2819 (LLVMValueRef []) { src0 }, 1,
2820 AC_FUNC_ATTR_READNONE);
2821
2822 result = LLVMBuildZExt(ctx->builder, result, ctx->i32, "");
2823 break;
2824 default:
2825 unreachable(!"invalid bitsize");
2826 break;
2827 }
2828
2829 return result;
2830 }
2831
2832 LLVMValueRef ac_build_bitfield_reverse(struct ac_llvm_context *ctx,
2833 LLVMValueRef src0)
2834 {
2835 LLVMValueRef result;
2836 unsigned bitsize;
2837
2838 bitsize = ac_get_elem_bits(ctx, LLVMTypeOf(src0));
2839
2840 switch (bitsize) {
2841 case 64:
2842 result = ac_build_intrinsic(ctx, "llvm.bitreverse.i64", ctx->i64,
2843 (LLVMValueRef []) { src0 }, 1,
2844 AC_FUNC_ATTR_READNONE);
2845
2846 result = LLVMBuildTrunc(ctx->builder, result, ctx->i32, "");
2847 break;
2848 case 32:
2849 result = ac_build_intrinsic(ctx, "llvm.bitreverse.i32", ctx->i32,
2850 (LLVMValueRef []) { src0 }, 1,
2851 AC_FUNC_ATTR_READNONE);
2852 break;
2853 case 16:
2854 result = ac_build_intrinsic(ctx, "llvm.bitreverse.i16", ctx->i16,
2855 (LLVMValueRef []) { src0 }, 1,
2856 AC_FUNC_ATTR_READNONE);
2857
2858 result = LLVMBuildZExt(ctx->builder, result, ctx->i32, "");
2859 break;
2860 case 8:
2861 result = ac_build_intrinsic(ctx, "llvm.bitreverse.i8", ctx->i8,
2862 (LLVMValueRef []) { src0 }, 1,
2863 AC_FUNC_ATTR_READNONE);
2864
2865 result = LLVMBuildZExt(ctx->builder, result, ctx->i32, "");
2866 break;
2867 default:
2868 unreachable(!"invalid bitsize");
2869 break;
2870 }
2871
2872 return result;
2873 }
2874
2875 #define AC_EXP_TARGET 0
2876 #define AC_EXP_ENABLED_CHANNELS 1
2877 #define AC_EXP_OUT0 2
2878
2879 enum ac_ir_type {
2880 AC_IR_UNDEF,
2881 AC_IR_CONST,
2882 AC_IR_VALUE,
2883 };
2884
2885 struct ac_vs_exp_chan
2886 {
2887 LLVMValueRef value;
2888 float const_float;
2889 enum ac_ir_type type;
2890 };
2891
2892 struct ac_vs_exp_inst {
2893 unsigned offset;
2894 LLVMValueRef inst;
2895 struct ac_vs_exp_chan chan[4];
2896 };
2897
2898 struct ac_vs_exports {
2899 unsigned num;
2900 struct ac_vs_exp_inst exp[VARYING_SLOT_MAX];
2901 };
2902
2903 /* Return true if the PARAM export has been eliminated. */
2904 static bool ac_eliminate_const_output(uint8_t *vs_output_param_offset,
2905 uint32_t num_outputs,
2906 struct ac_vs_exp_inst *exp)
2907 {
2908 unsigned i, default_val; /* SPI_PS_INPUT_CNTL_i.DEFAULT_VAL */
2909 bool is_zero[4] = {}, is_one[4] = {};
2910
2911 for (i = 0; i < 4; i++) {
2912 /* It's a constant expression. Undef outputs are eliminated too. */
2913 if (exp->chan[i].type == AC_IR_UNDEF) {
2914 is_zero[i] = true;
2915 is_one[i] = true;
2916 } else if (exp->chan[i].type == AC_IR_CONST) {
2917 if (exp->chan[i].const_float == 0)
2918 is_zero[i] = true;
2919 else if (exp->chan[i].const_float == 1)
2920 is_one[i] = true;
2921 else
2922 return false; /* other constant */
2923 } else
2924 return false;
2925 }
2926
2927 /* Only certain combinations of 0 and 1 can be eliminated. */
2928 if (is_zero[0] && is_zero[1] && is_zero[2])
2929 default_val = is_zero[3] ? 0 : 1;
2930 else if (is_one[0] && is_one[1] && is_one[2])
2931 default_val = is_zero[3] ? 2 : 3;
2932 else
2933 return false;
2934
2935 /* The PARAM export can be represented as DEFAULT_VAL. Kill it. */
2936 LLVMInstructionEraseFromParent(exp->inst);
2937
2938 /* Change OFFSET to DEFAULT_VAL. */
2939 for (i = 0; i < num_outputs; i++) {
2940 if (vs_output_param_offset[i] == exp->offset) {
2941 vs_output_param_offset[i] =
2942 AC_EXP_PARAM_DEFAULT_VAL_0000 + default_val;
2943 break;
2944 }
2945 }
2946 return true;
2947 }
2948
2949 static bool ac_eliminate_duplicated_output(struct ac_llvm_context *ctx,
2950 uint8_t *vs_output_param_offset,
2951 uint32_t num_outputs,
2952 struct ac_vs_exports *processed,
2953 struct ac_vs_exp_inst *exp)
2954 {
2955 unsigned p, copy_back_channels = 0;
2956
2957 /* See if the output is already in the list of processed outputs.
2958 * The LLVMValueRef comparison relies on SSA.
2959 */
2960 for (p = 0; p < processed->num; p++) {
2961 bool different = false;
2962
2963 for (unsigned j = 0; j < 4; j++) {
2964 struct ac_vs_exp_chan *c1 = &processed->exp[p].chan[j];
2965 struct ac_vs_exp_chan *c2 = &exp->chan[j];
2966
2967 /* Treat undef as a match. */
2968 if (c2->type == AC_IR_UNDEF)
2969 continue;
2970
2971 /* If c1 is undef but c2 isn't, we can copy c2 to c1
2972 * and consider the instruction duplicated.
2973 */
2974 if (c1->type == AC_IR_UNDEF) {
2975 copy_back_channels |= 1 << j;
2976 continue;
2977 }
2978
2979 /* Test whether the channels are not equal. */
2980 if (c1->type != c2->type ||
2981 (c1->type == AC_IR_CONST &&
2982 c1->const_float != c2->const_float) ||
2983 (c1->type == AC_IR_VALUE &&
2984 c1->value != c2->value)) {
2985 different = true;
2986 break;
2987 }
2988 }
2989 if (!different)
2990 break;
2991
2992 copy_back_channels = 0;
2993 }
2994 if (p == processed->num)
2995 return false;
2996
2997 /* If a match was found, but the matching export has undef where the new
2998 * one has a normal value, copy the normal value to the undef channel.
2999 */
3000 struct ac_vs_exp_inst *match = &processed->exp[p];
3001
3002 /* Get current enabled channels mask. */
3003 LLVMValueRef arg = LLVMGetOperand(match->inst, AC_EXP_ENABLED_CHANNELS);
3004 unsigned enabled_channels = LLVMConstIntGetZExtValue(arg);
3005
3006 while (copy_back_channels) {
3007 unsigned chan = u_bit_scan(&copy_back_channels);
3008
3009 assert(match->chan[chan].type == AC_IR_UNDEF);
3010 LLVMSetOperand(match->inst, AC_EXP_OUT0 + chan,
3011 exp->chan[chan].value);
3012 match->chan[chan] = exp->chan[chan];
3013
3014 /* Update number of enabled channels because the original mask
3015 * is not always 0xf.
3016 */
3017 enabled_channels |= (1 << chan);
3018 LLVMSetOperand(match->inst, AC_EXP_ENABLED_CHANNELS,
3019 LLVMConstInt(ctx->i32, enabled_channels, 0));
3020 }
3021
3022 /* The PARAM export is duplicated. Kill it. */
3023 LLVMInstructionEraseFromParent(exp->inst);
3024
3025 /* Change OFFSET to the matching export. */
3026 for (unsigned i = 0; i < num_outputs; i++) {
3027 if (vs_output_param_offset[i] == exp->offset) {
3028 vs_output_param_offset[i] = match->offset;
3029 break;
3030 }
3031 }
3032 return true;
3033 }
3034
3035 void ac_optimize_vs_outputs(struct ac_llvm_context *ctx,
3036 LLVMValueRef main_fn,
3037 uint8_t *vs_output_param_offset,
3038 uint32_t num_outputs,
3039 uint8_t *num_param_exports)
3040 {
3041 LLVMBasicBlockRef bb;
3042 bool removed_any = false;
3043 struct ac_vs_exports exports;
3044
3045 exports.num = 0;
3046
3047 /* Process all LLVM instructions. */
3048 bb = LLVMGetFirstBasicBlock(main_fn);
3049 while (bb) {
3050 LLVMValueRef inst = LLVMGetFirstInstruction(bb);
3051
3052 while (inst) {
3053 LLVMValueRef cur = inst;
3054 inst = LLVMGetNextInstruction(inst);
3055 struct ac_vs_exp_inst exp;
3056
3057 if (LLVMGetInstructionOpcode(cur) != LLVMCall)
3058 continue;
3059
3060 LLVMValueRef callee = ac_llvm_get_called_value(cur);
3061
3062 if (!ac_llvm_is_function(callee))
3063 continue;
3064
3065 const char *name = LLVMGetValueName(callee);
3066 unsigned num_args = LLVMCountParams(callee);
3067
3068 /* Check if this is an export instruction. */
3069 if ((num_args != 9 && num_args != 8) ||
3070 (strcmp(name, "llvm.SI.export") &&
3071 strcmp(name, "llvm.amdgcn.exp.f32")))
3072 continue;
3073
3074 LLVMValueRef arg = LLVMGetOperand(cur, AC_EXP_TARGET);
3075 unsigned target = LLVMConstIntGetZExtValue(arg);
3076
3077 if (target < V_008DFC_SQ_EXP_PARAM)
3078 continue;
3079
3080 target -= V_008DFC_SQ_EXP_PARAM;
3081
3082 /* Parse the instruction. */
3083 memset(&exp, 0, sizeof(exp));
3084 exp.offset = target;
3085 exp.inst = cur;
3086
3087 for (unsigned i = 0; i < 4; i++) {
3088 LLVMValueRef v = LLVMGetOperand(cur, AC_EXP_OUT0 + i);
3089
3090 exp.chan[i].value = v;
3091
3092 if (LLVMIsUndef(v)) {
3093 exp.chan[i].type = AC_IR_UNDEF;
3094 } else if (LLVMIsAConstantFP(v)) {
3095 LLVMBool loses_info;
3096 exp.chan[i].type = AC_IR_CONST;
3097 exp.chan[i].const_float =
3098 LLVMConstRealGetDouble(v, &loses_info);
3099 } else {
3100 exp.chan[i].type = AC_IR_VALUE;
3101 }
3102 }
3103
3104 /* Eliminate constant and duplicated PARAM exports. */
3105 if (ac_eliminate_const_output(vs_output_param_offset,
3106 num_outputs, &exp) ||
3107 ac_eliminate_duplicated_output(ctx,
3108 vs_output_param_offset,
3109 num_outputs, &exports,
3110 &exp)) {
3111 removed_any = true;
3112 } else {
3113 exports.exp[exports.num++] = exp;
3114 }
3115 }
3116 bb = LLVMGetNextBasicBlock(bb);
3117 }
3118
3119 /* Remove holes in export memory due to removed PARAM exports.
3120 * This is done by renumbering all PARAM exports.
3121 */
3122 if (removed_any) {
3123 uint8_t old_offset[VARYING_SLOT_MAX];
3124 unsigned out, i;
3125
3126 /* Make a copy of the offsets. We need the old version while
3127 * we are modifying some of them. */
3128 memcpy(old_offset, vs_output_param_offset,
3129 sizeof(old_offset));
3130
3131 for (i = 0; i < exports.num; i++) {
3132 unsigned offset = exports.exp[i].offset;
3133
3134 /* Update vs_output_param_offset. Multiple outputs can
3135 * have the same offset.
3136 */
3137 for (out = 0; out < num_outputs; out++) {
3138 if (old_offset[out] == offset)
3139 vs_output_param_offset[out] = i;
3140 }
3141
3142 /* Change the PARAM offset in the instruction. */
3143 LLVMSetOperand(exports.exp[i].inst, AC_EXP_TARGET,
3144 LLVMConstInt(ctx->i32,
3145 V_008DFC_SQ_EXP_PARAM + i, 0));
3146 }
3147 *num_param_exports = exports.num;
3148 }
3149 }
3150
3151 void ac_init_exec_full_mask(struct ac_llvm_context *ctx)
3152 {
3153 LLVMValueRef full_mask = LLVMConstInt(ctx->i64, ~0ull, 0);
3154 ac_build_intrinsic(ctx,
3155 "llvm.amdgcn.init.exec", ctx->voidt,
3156 &full_mask, 1, AC_FUNC_ATTR_CONVERGENT);
3157 }
3158
3159 void ac_declare_lds_as_pointer(struct ac_llvm_context *ctx)
3160 {
3161 unsigned lds_size = ctx->chip_class >= GFX7 ? 65536 : 32768;
3162 ctx->lds = LLVMBuildIntToPtr(ctx->builder, ctx->i32_0,
3163 LLVMPointerType(LLVMArrayType(ctx->i32, lds_size / 4), AC_ADDR_SPACE_LDS),
3164 "lds");
3165 }
3166
3167 LLVMValueRef ac_lds_load(struct ac_llvm_context *ctx,
3168 LLVMValueRef dw_addr)
3169 {
3170 return LLVMBuildLoad(ctx->builder, ac_build_gep0(ctx, ctx->lds, dw_addr), "");
3171 }
3172
3173 void ac_lds_store(struct ac_llvm_context *ctx,
3174 LLVMValueRef dw_addr,
3175 LLVMValueRef value)
3176 {
3177 value = ac_to_integer(ctx, value);
3178 ac_build_indexed_store(ctx, ctx->lds,
3179 dw_addr, value);
3180 }
3181
3182 LLVMValueRef ac_find_lsb(struct ac_llvm_context *ctx,
3183 LLVMTypeRef dst_type,
3184 LLVMValueRef src0)
3185 {
3186 unsigned src0_bitsize = ac_get_elem_bits(ctx, LLVMTypeOf(src0));
3187 const char *intrin_name;
3188 LLVMTypeRef type;
3189 LLVMValueRef zero;
3190
3191 switch (src0_bitsize) {
3192 case 64:
3193 intrin_name = "llvm.cttz.i64";
3194 type = ctx->i64;
3195 zero = ctx->i64_0;
3196 break;
3197 case 32:
3198 intrin_name = "llvm.cttz.i32";
3199 type = ctx->i32;
3200 zero = ctx->i32_0;
3201 break;
3202 case 16:
3203 intrin_name = "llvm.cttz.i16";
3204 type = ctx->i16;
3205 zero = ctx->i16_0;
3206 break;
3207 case 8:
3208 intrin_name = "llvm.cttz.i8";
3209 type = ctx->i8;
3210 zero = ctx->i8_0;
3211 break;
3212 default:
3213 unreachable(!"invalid bitsize");
3214 }
3215
3216 LLVMValueRef params[2] = {
3217 src0,
3218
3219 /* The value of 1 means that ffs(x=0) = undef, so LLVM won't
3220 * add special code to check for x=0. The reason is that
3221 * the LLVM behavior for x=0 is different from what we
3222 * need here. However, LLVM also assumes that ffs(x) is
3223 * in [0, 31], but GLSL expects that ffs(0) = -1, so
3224 * a conditional assignment to handle 0 is still required.
3225 *
3226 * The hardware already implements the correct behavior.
3227 */
3228 ctx->i1true,
3229 };
3230
3231 LLVMValueRef lsb = ac_build_intrinsic(ctx, intrin_name, type,
3232 params, 2,
3233 AC_FUNC_ATTR_READNONE);
3234
3235 if (src0_bitsize == 64) {
3236 lsb = LLVMBuildTrunc(ctx->builder, lsb, ctx->i32, "");
3237 } else if (src0_bitsize < 32) {
3238 lsb = LLVMBuildSExt(ctx->builder, lsb, ctx->i32, "");
3239 }
3240
3241 /* TODO: We need an intrinsic to skip this conditional. */
3242 /* Check for zero: */
3243 return LLVMBuildSelect(ctx->builder, LLVMBuildICmp(ctx->builder,
3244 LLVMIntEQ, src0,
3245 zero, ""),
3246 LLVMConstInt(ctx->i32, -1, 0), lsb, "");
3247 }
3248
3249 LLVMTypeRef ac_array_in_const_addr_space(LLVMTypeRef elem_type)
3250 {
3251 return LLVMPointerType(elem_type, AC_ADDR_SPACE_CONST);
3252 }
3253
3254 LLVMTypeRef ac_array_in_const32_addr_space(LLVMTypeRef elem_type)
3255 {
3256 return LLVMPointerType(elem_type, AC_ADDR_SPACE_CONST_32BIT);
3257 }
3258
3259 static struct ac_llvm_flow *
3260 get_current_flow(struct ac_llvm_context *ctx)
3261 {
3262 if (ctx->flow->depth > 0)
3263 return &ctx->flow->stack[ctx->flow->depth - 1];
3264 return NULL;
3265 }
3266
3267 static struct ac_llvm_flow *
3268 get_innermost_loop(struct ac_llvm_context *ctx)
3269 {
3270 for (unsigned i = ctx->flow->depth; i > 0; --i) {
3271 if (ctx->flow->stack[i - 1].loop_entry_block)
3272 return &ctx->flow->stack[i - 1];
3273 }
3274 return NULL;
3275 }
3276
3277 static struct ac_llvm_flow *
3278 push_flow(struct ac_llvm_context *ctx)
3279 {
3280 struct ac_llvm_flow *flow;
3281
3282 if (ctx->flow->depth >= ctx->flow->depth_max) {
3283 unsigned new_max = MAX2(ctx->flow->depth << 1,
3284 AC_LLVM_INITIAL_CF_DEPTH);
3285
3286 ctx->flow->stack = realloc(ctx->flow->stack, new_max * sizeof(*ctx->flow->stack));
3287 ctx->flow->depth_max = new_max;
3288 }
3289
3290 flow = &ctx->flow->stack[ctx->flow->depth];
3291 ctx->flow->depth++;
3292
3293 flow->next_block = NULL;
3294 flow->loop_entry_block = NULL;
3295 return flow;
3296 }
3297
3298 static void set_basicblock_name(LLVMBasicBlockRef bb, const char *base,
3299 int label_id)
3300 {
3301 char buf[32];
3302 snprintf(buf, sizeof(buf), "%s%d", base, label_id);
3303 LLVMSetValueName(LLVMBasicBlockAsValue(bb), buf);
3304 }
3305
3306 /* Append a basic block at the level of the parent flow.
3307 */
3308 static LLVMBasicBlockRef append_basic_block(struct ac_llvm_context *ctx,
3309 const char *name)
3310 {
3311 assert(ctx->flow->depth >= 1);
3312
3313 if (ctx->flow->depth >= 2) {
3314 struct ac_llvm_flow *flow = &ctx->flow->stack[ctx->flow->depth - 2];
3315
3316 return LLVMInsertBasicBlockInContext(ctx->context,
3317 flow->next_block, name);
3318 }
3319
3320 LLVMValueRef main_fn =
3321 LLVMGetBasicBlockParent(LLVMGetInsertBlock(ctx->builder));
3322 return LLVMAppendBasicBlockInContext(ctx->context, main_fn, name);
3323 }
3324
3325 /* Emit a branch to the given default target for the current block if
3326 * applicable -- that is, if the current block does not already contain a
3327 * branch from a break or continue.
3328 */
3329 static void emit_default_branch(LLVMBuilderRef builder,
3330 LLVMBasicBlockRef target)
3331 {
3332 if (!LLVMGetBasicBlockTerminator(LLVMGetInsertBlock(builder)))
3333 LLVMBuildBr(builder, target);
3334 }
3335
3336 void ac_build_bgnloop(struct ac_llvm_context *ctx, int label_id)
3337 {
3338 struct ac_llvm_flow *flow = push_flow(ctx);
3339 flow->loop_entry_block = append_basic_block(ctx, "LOOP");
3340 flow->next_block = append_basic_block(ctx, "ENDLOOP");
3341 set_basicblock_name(flow->loop_entry_block, "loop", label_id);
3342 LLVMBuildBr(ctx->builder, flow->loop_entry_block);
3343 LLVMPositionBuilderAtEnd(ctx->builder, flow->loop_entry_block);
3344 }
3345
3346 void ac_build_break(struct ac_llvm_context *ctx)
3347 {
3348 struct ac_llvm_flow *flow = get_innermost_loop(ctx);
3349 LLVMBuildBr(ctx->builder, flow->next_block);
3350 }
3351
3352 void ac_build_continue(struct ac_llvm_context *ctx)
3353 {
3354 struct ac_llvm_flow *flow = get_innermost_loop(ctx);
3355 LLVMBuildBr(ctx->builder, flow->loop_entry_block);
3356 }
3357
3358 void ac_build_else(struct ac_llvm_context *ctx, int label_id)
3359 {
3360 struct ac_llvm_flow *current_branch = get_current_flow(ctx);
3361 LLVMBasicBlockRef endif_block;
3362
3363 assert(!current_branch->loop_entry_block);
3364
3365 endif_block = append_basic_block(ctx, "ENDIF");
3366 emit_default_branch(ctx->builder, endif_block);
3367
3368 LLVMPositionBuilderAtEnd(ctx->builder, current_branch->next_block);
3369 set_basicblock_name(current_branch->next_block, "else", label_id);
3370
3371 current_branch->next_block = endif_block;
3372 }
3373
3374 void ac_build_endif(struct ac_llvm_context *ctx, int label_id)
3375 {
3376 struct ac_llvm_flow *current_branch = get_current_flow(ctx);
3377
3378 assert(!current_branch->loop_entry_block);
3379
3380 emit_default_branch(ctx->builder, current_branch->next_block);
3381 LLVMPositionBuilderAtEnd(ctx->builder, current_branch->next_block);
3382 set_basicblock_name(current_branch->next_block, "endif", label_id);
3383
3384 ctx->flow->depth--;
3385 }
3386
3387 void ac_build_endloop(struct ac_llvm_context *ctx, int label_id)
3388 {
3389 struct ac_llvm_flow *current_loop = get_current_flow(ctx);
3390
3391 assert(current_loop->loop_entry_block);
3392
3393 emit_default_branch(ctx->builder, current_loop->loop_entry_block);
3394
3395 LLVMPositionBuilderAtEnd(ctx->builder, current_loop->next_block);
3396 set_basicblock_name(current_loop->next_block, "endloop", label_id);
3397 ctx->flow->depth--;
3398 }
3399
3400 void ac_build_ifcc(struct ac_llvm_context *ctx, LLVMValueRef cond, int label_id)
3401 {
3402 struct ac_llvm_flow *flow = push_flow(ctx);
3403 LLVMBasicBlockRef if_block;
3404
3405 if_block = append_basic_block(ctx, "IF");
3406 flow->next_block = append_basic_block(ctx, "ELSE");
3407 set_basicblock_name(if_block, "if", label_id);
3408 LLVMBuildCondBr(ctx->builder, cond, if_block, flow->next_block);
3409 LLVMPositionBuilderAtEnd(ctx->builder, if_block);
3410 }
3411
3412 void ac_build_if(struct ac_llvm_context *ctx, LLVMValueRef value,
3413 int label_id)
3414 {
3415 LLVMValueRef cond = LLVMBuildFCmp(ctx->builder, LLVMRealUNE,
3416 value, ctx->f32_0, "");
3417 ac_build_ifcc(ctx, cond, label_id);
3418 }
3419
3420 void ac_build_uif(struct ac_llvm_context *ctx, LLVMValueRef value,
3421 int label_id)
3422 {
3423 LLVMValueRef cond = LLVMBuildICmp(ctx->builder, LLVMIntNE,
3424 ac_to_integer(ctx, value),
3425 ctx->i32_0, "");
3426 ac_build_ifcc(ctx, cond, label_id);
3427 }
3428
3429 LLVMValueRef ac_build_alloca_undef(struct ac_llvm_context *ac, LLVMTypeRef type,
3430 const char *name)
3431 {
3432 LLVMBuilderRef builder = ac->builder;
3433 LLVMBasicBlockRef current_block = LLVMGetInsertBlock(builder);
3434 LLVMValueRef function = LLVMGetBasicBlockParent(current_block);
3435 LLVMBasicBlockRef first_block = LLVMGetEntryBasicBlock(function);
3436 LLVMValueRef first_instr = LLVMGetFirstInstruction(first_block);
3437 LLVMBuilderRef first_builder = LLVMCreateBuilderInContext(ac->context);
3438 LLVMValueRef res;
3439
3440 if (first_instr) {
3441 LLVMPositionBuilderBefore(first_builder, first_instr);
3442 } else {
3443 LLVMPositionBuilderAtEnd(first_builder, first_block);
3444 }
3445
3446 res = LLVMBuildAlloca(first_builder, type, name);
3447 LLVMDisposeBuilder(first_builder);
3448 return res;
3449 }
3450
3451 LLVMValueRef ac_build_alloca(struct ac_llvm_context *ac,
3452 LLVMTypeRef type, const char *name)
3453 {
3454 LLVMValueRef ptr = ac_build_alloca_undef(ac, type, name);
3455 LLVMBuildStore(ac->builder, LLVMConstNull(type), ptr);
3456 return ptr;
3457 }
3458
3459 LLVMValueRef ac_cast_ptr(struct ac_llvm_context *ctx, LLVMValueRef ptr,
3460 LLVMTypeRef type)
3461 {
3462 int addr_space = LLVMGetPointerAddressSpace(LLVMTypeOf(ptr));
3463 return LLVMBuildBitCast(ctx->builder, ptr,
3464 LLVMPointerType(type, addr_space), "");
3465 }
3466
3467 LLVMValueRef ac_trim_vector(struct ac_llvm_context *ctx, LLVMValueRef value,
3468 unsigned count)
3469 {
3470 unsigned num_components = ac_get_llvm_num_components(value);
3471 if (count == num_components)
3472 return value;
3473
3474 LLVMValueRef masks[MAX2(count, 2)];
3475 masks[0] = ctx->i32_0;
3476 masks[1] = ctx->i32_1;
3477 for (unsigned i = 2; i < count; i++)
3478 masks[i] = LLVMConstInt(ctx->i32, i, false);
3479
3480 if (count == 1)
3481 return LLVMBuildExtractElement(ctx->builder, value, masks[0],
3482 "");
3483
3484 LLVMValueRef swizzle = LLVMConstVector(masks, count);
3485 return LLVMBuildShuffleVector(ctx->builder, value, value, swizzle, "");
3486 }
3487
3488 LLVMValueRef ac_unpack_param(struct ac_llvm_context *ctx, LLVMValueRef param,
3489 unsigned rshift, unsigned bitwidth)
3490 {
3491 LLVMValueRef value = param;
3492 if (rshift)
3493 value = LLVMBuildLShr(ctx->builder, value,
3494 LLVMConstInt(ctx->i32, rshift, false), "");
3495
3496 if (rshift + bitwidth < 32) {
3497 unsigned mask = (1 << bitwidth) - 1;
3498 value = LLVMBuildAnd(ctx->builder, value,
3499 LLVMConstInt(ctx->i32, mask, false), "");
3500 }
3501 return value;
3502 }
3503
3504 /* Adjust the sample index according to FMASK.
3505 *
3506 * For uncompressed MSAA surfaces, FMASK should return 0x76543210,
3507 * which is the identity mapping. Each nibble says which physical sample
3508 * should be fetched to get that sample.
3509 *
3510 * For example, 0x11111100 means there are only 2 samples stored and
3511 * the second sample covers 3/4 of the pixel. When reading samples 0
3512 * and 1, return physical sample 0 (determined by the first two 0s
3513 * in FMASK), otherwise return physical sample 1.
3514 *
3515 * The sample index should be adjusted as follows:
3516 * addr[sample_index] = (fmask >> (addr[sample_index] * 4)) & 0xF;
3517 */
3518 void ac_apply_fmask_to_sample(struct ac_llvm_context *ac, LLVMValueRef fmask,
3519 LLVMValueRef *addr, bool is_array_tex)
3520 {
3521 struct ac_image_args fmask_load = {};
3522 fmask_load.opcode = ac_image_load;
3523 fmask_load.resource = fmask;
3524 fmask_load.dmask = 0xf;
3525 fmask_load.dim = is_array_tex ? ac_image_2darray : ac_image_2d;
3526 fmask_load.attributes = AC_FUNC_ATTR_READNONE;
3527
3528 fmask_load.coords[0] = addr[0];
3529 fmask_load.coords[1] = addr[1];
3530 if (is_array_tex)
3531 fmask_load.coords[2] = addr[2];
3532
3533 LLVMValueRef fmask_value = ac_build_image_opcode(ac, &fmask_load);
3534 fmask_value = LLVMBuildExtractElement(ac->builder, fmask_value,
3535 ac->i32_0, "");
3536
3537 /* Apply the formula. */
3538 unsigned sample_chan = is_array_tex ? 3 : 2;
3539 LLVMValueRef final_sample;
3540 final_sample = LLVMBuildMul(ac->builder, addr[sample_chan],
3541 LLVMConstInt(ac->i32, 4, 0), "");
3542 final_sample = LLVMBuildLShr(ac->builder, fmask_value, final_sample, "");
3543 /* Mask the sample index by 0x7, because 0x8 means an unknown value
3544 * with EQAA, so those will map to 0. */
3545 final_sample = LLVMBuildAnd(ac->builder, final_sample,
3546 LLVMConstInt(ac->i32, 0x7, 0), "");
3547
3548 /* Don't rewrite the sample index if WORD1.DATA_FORMAT of the FMASK
3549 * resource descriptor is 0 (invalid).
3550 */
3551 LLVMValueRef tmp;
3552 tmp = LLVMBuildBitCast(ac->builder, fmask, ac->v8i32, "");
3553 tmp = LLVMBuildExtractElement(ac->builder, tmp, ac->i32_1, "");
3554 tmp = LLVMBuildICmp(ac->builder, LLVMIntNE, tmp, ac->i32_0, "");
3555
3556 /* Replace the MSAA sample index. */
3557 addr[sample_chan] = LLVMBuildSelect(ac->builder, tmp, final_sample,
3558 addr[sample_chan], "");
3559 }
3560
3561 static LLVMValueRef
3562 _ac_build_readlane(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef lane)
3563 {
3564 ac_build_optimization_barrier(ctx, &src);
3565 return ac_build_intrinsic(ctx,
3566 lane == NULL ? "llvm.amdgcn.readfirstlane" : "llvm.amdgcn.readlane",
3567 LLVMTypeOf(src), (LLVMValueRef []) {
3568 src, lane },
3569 lane == NULL ? 1 : 2,
3570 AC_FUNC_ATTR_READNONE |
3571 AC_FUNC_ATTR_CONVERGENT);
3572 }
3573
3574 /**
3575 * Builds the "llvm.amdgcn.readlane" or "llvm.amdgcn.readfirstlane" intrinsic.
3576 * @param ctx
3577 * @param src
3578 * @param lane - id of the lane or NULL for the first active lane
3579 * @return value of the lane
3580 */
3581 LLVMValueRef
3582 ac_build_readlane(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef lane)
3583 {
3584 LLVMTypeRef src_type = LLVMTypeOf(src);
3585 src = ac_to_integer(ctx, src);
3586 unsigned bits = LLVMGetIntTypeWidth(LLVMTypeOf(src));
3587 LLVMValueRef ret;
3588
3589 if (bits == 32) {
3590 ret = _ac_build_readlane(ctx, src, lane);
3591 } else {
3592 assert(bits % 32 == 0);
3593 LLVMTypeRef vec_type = LLVMVectorType(ctx->i32, bits / 32);
3594 LLVMValueRef src_vector =
3595 LLVMBuildBitCast(ctx->builder, src, vec_type, "");
3596 ret = LLVMGetUndef(vec_type);
3597 for (unsigned i = 0; i < bits / 32; i++) {
3598 src = LLVMBuildExtractElement(ctx->builder, src_vector,
3599 LLVMConstInt(ctx->i32, i, 0), "");
3600 LLVMValueRef ret_comp = _ac_build_readlane(ctx, src, lane);
3601 ret = LLVMBuildInsertElement(ctx->builder, ret, ret_comp,
3602 LLVMConstInt(ctx->i32, i, 0), "");
3603 }
3604 }
3605 if (LLVMGetTypeKind(src_type) == LLVMPointerTypeKind)
3606 return LLVMBuildIntToPtr(ctx->builder, ret, src_type, "");
3607 return LLVMBuildBitCast(ctx->builder, ret, src_type, "");
3608 }
3609
3610 LLVMValueRef
3611 ac_build_writelane(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef value, LLVMValueRef lane)
3612 {
3613 return ac_build_intrinsic(ctx, "llvm.amdgcn.writelane", ctx->i32,
3614 (LLVMValueRef []) {value, lane, src}, 3,
3615 AC_FUNC_ATTR_READNONE | AC_FUNC_ATTR_CONVERGENT);
3616 }
3617
3618 LLVMValueRef
3619 ac_build_mbcnt(struct ac_llvm_context *ctx, LLVMValueRef mask)
3620 {
3621 if (ctx->wave_size == 32) {
3622 return ac_build_intrinsic(ctx, "llvm.amdgcn.mbcnt.lo", ctx->i32,
3623 (LLVMValueRef []) { mask, ctx->i32_0 },
3624 2, AC_FUNC_ATTR_READNONE);
3625 }
3626 LLVMValueRef mask_vec = LLVMBuildBitCast(ctx->builder, mask,
3627 LLVMVectorType(ctx->i32, 2),
3628 "");
3629 LLVMValueRef mask_lo = LLVMBuildExtractElement(ctx->builder, mask_vec,
3630 ctx->i32_0, "");
3631 LLVMValueRef mask_hi = LLVMBuildExtractElement(ctx->builder, mask_vec,
3632 ctx->i32_1, "");
3633 LLVMValueRef val =
3634 ac_build_intrinsic(ctx, "llvm.amdgcn.mbcnt.lo", ctx->i32,
3635 (LLVMValueRef []) { mask_lo, ctx->i32_0 },
3636 2, AC_FUNC_ATTR_READNONE);
3637 val = ac_build_intrinsic(ctx, "llvm.amdgcn.mbcnt.hi", ctx->i32,
3638 (LLVMValueRef []) { mask_hi, val },
3639 2, AC_FUNC_ATTR_READNONE);
3640 return val;
3641 }
3642
3643 enum dpp_ctrl {
3644 _dpp_quad_perm = 0x000,
3645 _dpp_row_sl = 0x100,
3646 _dpp_row_sr = 0x110,
3647 _dpp_row_rr = 0x120,
3648 dpp_wf_sl1 = 0x130,
3649 dpp_wf_rl1 = 0x134,
3650 dpp_wf_sr1 = 0x138,
3651 dpp_wf_rr1 = 0x13C,
3652 dpp_row_mirror = 0x140,
3653 dpp_row_half_mirror = 0x141,
3654 dpp_row_bcast15 = 0x142,
3655 dpp_row_bcast31 = 0x143
3656 };
3657
3658 static inline enum dpp_ctrl
3659 dpp_quad_perm(unsigned lane0, unsigned lane1, unsigned lane2, unsigned lane3)
3660 {
3661 assert(lane0 < 4 && lane1 < 4 && lane2 < 4 && lane3 < 4);
3662 return _dpp_quad_perm | lane0 | (lane1 << 2) | (lane2 << 4) | (lane3 << 6);
3663 }
3664
3665 static inline enum dpp_ctrl
3666 dpp_row_sl(unsigned amount)
3667 {
3668 assert(amount > 0 && amount < 16);
3669 return _dpp_row_sl | amount;
3670 }
3671
3672 static inline enum dpp_ctrl
3673 dpp_row_sr(unsigned amount)
3674 {
3675 assert(amount > 0 && amount < 16);
3676 return _dpp_row_sr | amount;
3677 }
3678
3679 static LLVMValueRef
3680 _ac_build_dpp(struct ac_llvm_context *ctx, LLVMValueRef old, LLVMValueRef src,
3681 enum dpp_ctrl dpp_ctrl, unsigned row_mask, unsigned bank_mask,
3682 bool bound_ctrl)
3683 {
3684 return ac_build_intrinsic(ctx, "llvm.amdgcn.update.dpp.i32",
3685 LLVMTypeOf(old),
3686 (LLVMValueRef[]) {
3687 old, src,
3688 LLVMConstInt(ctx->i32, dpp_ctrl, 0),
3689 LLVMConstInt(ctx->i32, row_mask, 0),
3690 LLVMConstInt(ctx->i32, bank_mask, 0),
3691 LLVMConstInt(ctx->i1, bound_ctrl, 0) },
3692 6, AC_FUNC_ATTR_READNONE | AC_FUNC_ATTR_CONVERGENT);
3693 }
3694
3695 static LLVMValueRef
3696 ac_build_dpp(struct ac_llvm_context *ctx, LLVMValueRef old, LLVMValueRef src,
3697 enum dpp_ctrl dpp_ctrl, unsigned row_mask, unsigned bank_mask,
3698 bool bound_ctrl)
3699 {
3700 LLVMTypeRef src_type = LLVMTypeOf(src);
3701 src = ac_to_integer(ctx, src);
3702 old = ac_to_integer(ctx, old);
3703 unsigned bits = LLVMGetIntTypeWidth(LLVMTypeOf(src));
3704 LLVMValueRef ret;
3705 if (bits == 32) {
3706 ret = _ac_build_dpp(ctx, old, src, dpp_ctrl, row_mask,
3707 bank_mask, bound_ctrl);
3708 } else {
3709 assert(bits % 32 == 0);
3710 LLVMTypeRef vec_type = LLVMVectorType(ctx->i32, bits / 32);
3711 LLVMValueRef src_vector =
3712 LLVMBuildBitCast(ctx->builder, src, vec_type, "");
3713 LLVMValueRef old_vector =
3714 LLVMBuildBitCast(ctx->builder, old, vec_type, "");
3715 ret = LLVMGetUndef(vec_type);
3716 for (unsigned i = 0; i < bits / 32; i++) {
3717 src = LLVMBuildExtractElement(ctx->builder, src_vector,
3718 LLVMConstInt(ctx->i32, i,
3719 0), "");
3720 old = LLVMBuildExtractElement(ctx->builder, old_vector,
3721 LLVMConstInt(ctx->i32, i,
3722 0), "");
3723 LLVMValueRef ret_comp = _ac_build_dpp(ctx, old, src,
3724 dpp_ctrl,
3725 row_mask,
3726 bank_mask,
3727 bound_ctrl);
3728 ret = LLVMBuildInsertElement(ctx->builder, ret,
3729 ret_comp,
3730 LLVMConstInt(ctx->i32, i,
3731 0), "");
3732 }
3733 }
3734 return LLVMBuildBitCast(ctx->builder, ret, src_type, "");
3735 }
3736
3737 static LLVMValueRef
3738 _ac_build_permlane16(struct ac_llvm_context *ctx, LLVMValueRef src, uint64_t sel,
3739 bool exchange_rows, bool bound_ctrl)
3740 {
3741 LLVMValueRef args[6] = {
3742 src,
3743 src,
3744 LLVMConstInt(ctx->i32, sel, false),
3745 LLVMConstInt(ctx->i32, sel >> 32, false),
3746 ctx->i1true, /* fi */
3747 bound_ctrl ? ctx->i1true : ctx->i1false,
3748 };
3749 return ac_build_intrinsic(ctx, exchange_rows ? "llvm.amdgcn.permlanex16"
3750 : "llvm.amdgcn.permlane16",
3751 ctx->i32, args, 6,
3752 AC_FUNC_ATTR_READNONE | AC_FUNC_ATTR_CONVERGENT);
3753 }
3754
3755 static LLVMValueRef
3756 ac_build_permlane16(struct ac_llvm_context *ctx, LLVMValueRef src, uint64_t sel,
3757 bool exchange_rows, bool bound_ctrl)
3758 {
3759 LLVMTypeRef src_type = LLVMTypeOf(src);
3760 src = ac_to_integer(ctx, src);
3761 unsigned bits = LLVMGetIntTypeWidth(LLVMTypeOf(src));
3762 LLVMValueRef ret;
3763 if (bits == 32) {
3764 ret = _ac_build_permlane16(ctx, src, sel, exchange_rows,
3765 bound_ctrl);
3766 } else {
3767 assert(bits % 32 == 0);
3768 LLVMTypeRef vec_type = LLVMVectorType(ctx->i32, bits / 32);
3769 LLVMValueRef src_vector =
3770 LLVMBuildBitCast(ctx->builder, src, vec_type, "");
3771 ret = LLVMGetUndef(vec_type);
3772 for (unsigned i = 0; i < bits / 32; i++) {
3773 src = LLVMBuildExtractElement(ctx->builder, src_vector,
3774 LLVMConstInt(ctx->i32, i,
3775 0), "");
3776 LLVMValueRef ret_comp =
3777 _ac_build_permlane16(ctx, src, sel,
3778 exchange_rows,
3779 bound_ctrl);
3780 ret = LLVMBuildInsertElement(ctx->builder, ret,
3781 ret_comp,
3782 LLVMConstInt(ctx->i32, i,
3783 0), "");
3784 }
3785 }
3786 return LLVMBuildBitCast(ctx->builder, ret, src_type, "");
3787 }
3788
3789 static inline unsigned
3790 ds_pattern_bitmode(unsigned and_mask, unsigned or_mask, unsigned xor_mask)
3791 {
3792 assert(and_mask < 32 && or_mask < 32 && xor_mask < 32);
3793 return and_mask | (or_mask << 5) | (xor_mask << 10);
3794 }
3795
3796 static LLVMValueRef
3797 _ac_build_ds_swizzle(struct ac_llvm_context *ctx, LLVMValueRef src, unsigned mask)
3798 {
3799 return ac_build_intrinsic(ctx, "llvm.amdgcn.ds.swizzle",
3800 LLVMTypeOf(src), (LLVMValueRef []) {
3801 src, LLVMConstInt(ctx->i32, mask, 0) },
3802 2, AC_FUNC_ATTR_READNONE | AC_FUNC_ATTR_CONVERGENT);
3803 }
3804
3805 LLVMValueRef
3806 ac_build_ds_swizzle(struct ac_llvm_context *ctx, LLVMValueRef src, unsigned mask)
3807 {
3808 LLVMTypeRef src_type = LLVMTypeOf(src);
3809 src = ac_to_integer(ctx, src);
3810 unsigned bits = LLVMGetIntTypeWidth(LLVMTypeOf(src));
3811 LLVMValueRef ret;
3812 if (bits == 32) {
3813 ret = _ac_build_ds_swizzle(ctx, src, mask);
3814 } else {
3815 assert(bits % 32 == 0);
3816 LLVMTypeRef vec_type = LLVMVectorType(ctx->i32, bits / 32);
3817 LLVMValueRef src_vector =
3818 LLVMBuildBitCast(ctx->builder, src, vec_type, "");
3819 ret = LLVMGetUndef(vec_type);
3820 for (unsigned i = 0; i < bits / 32; i++) {
3821 src = LLVMBuildExtractElement(ctx->builder, src_vector,
3822 LLVMConstInt(ctx->i32, i,
3823 0), "");
3824 LLVMValueRef ret_comp = _ac_build_ds_swizzle(ctx, src,
3825 mask);
3826 ret = LLVMBuildInsertElement(ctx->builder, ret,
3827 ret_comp,
3828 LLVMConstInt(ctx->i32, i,
3829 0), "");
3830 }
3831 }
3832 return LLVMBuildBitCast(ctx->builder, ret, src_type, "");
3833 }
3834
3835 static LLVMValueRef
3836 ac_build_wwm(struct ac_llvm_context *ctx, LLVMValueRef src)
3837 {
3838 char name[32], type[8];
3839 ac_build_type_name_for_intr(LLVMTypeOf(src), type, sizeof(type));
3840 snprintf(name, sizeof(name), "llvm.amdgcn.wwm.%s", type);
3841 return ac_build_intrinsic(ctx, name, LLVMTypeOf(src),
3842 (LLVMValueRef []) { src }, 1,
3843 AC_FUNC_ATTR_READNONE);
3844 }
3845
3846 static LLVMValueRef
3847 ac_build_set_inactive(struct ac_llvm_context *ctx, LLVMValueRef src,
3848 LLVMValueRef inactive)
3849 {
3850 char name[33], type[8];
3851 LLVMTypeRef src_type = LLVMTypeOf(src);
3852 src = ac_to_integer(ctx, src);
3853 inactive = ac_to_integer(ctx, inactive);
3854 ac_build_type_name_for_intr(LLVMTypeOf(src), type, sizeof(type));
3855 snprintf(name, sizeof(name), "llvm.amdgcn.set.inactive.%s", type);
3856 LLVMValueRef ret =
3857 ac_build_intrinsic(ctx, name,
3858 LLVMTypeOf(src), (LLVMValueRef []) {
3859 src, inactive }, 2,
3860 AC_FUNC_ATTR_READNONE |
3861 AC_FUNC_ATTR_CONVERGENT);
3862 return LLVMBuildBitCast(ctx->builder, ret, src_type, "");
3863 }
3864
3865 static LLVMValueRef
3866 get_reduction_identity(struct ac_llvm_context *ctx, nir_op op, unsigned type_size)
3867 {
3868 if (type_size == 4) {
3869 switch (op) {
3870 case nir_op_iadd: return ctx->i32_0;
3871 case nir_op_fadd: return ctx->f32_0;
3872 case nir_op_imul: return ctx->i32_1;
3873 case nir_op_fmul: return ctx->f32_1;
3874 case nir_op_imin: return LLVMConstInt(ctx->i32, INT32_MAX, 0);
3875 case nir_op_umin: return LLVMConstInt(ctx->i32, UINT32_MAX, 0);
3876 case nir_op_fmin: return LLVMConstReal(ctx->f32, INFINITY);
3877 case nir_op_imax: return LLVMConstInt(ctx->i32, INT32_MIN, 0);
3878 case nir_op_umax: return ctx->i32_0;
3879 case nir_op_fmax: return LLVMConstReal(ctx->f32, -INFINITY);
3880 case nir_op_iand: return LLVMConstInt(ctx->i32, -1, 0);
3881 case nir_op_ior: return ctx->i32_0;
3882 case nir_op_ixor: return ctx->i32_0;
3883 default:
3884 unreachable("bad reduction intrinsic");
3885 }
3886 } else { /* type_size == 64bit */
3887 switch (op) {
3888 case nir_op_iadd: return ctx->i64_0;
3889 case nir_op_fadd: return ctx->f64_0;
3890 case nir_op_imul: return ctx->i64_1;
3891 case nir_op_fmul: return ctx->f64_1;
3892 case nir_op_imin: return LLVMConstInt(ctx->i64, INT64_MAX, 0);
3893 case nir_op_umin: return LLVMConstInt(ctx->i64, UINT64_MAX, 0);
3894 case nir_op_fmin: return LLVMConstReal(ctx->f64, INFINITY);
3895 case nir_op_imax: return LLVMConstInt(ctx->i64, INT64_MIN, 0);
3896 case nir_op_umax: return ctx->i64_0;
3897 case nir_op_fmax: return LLVMConstReal(ctx->f64, -INFINITY);
3898 case nir_op_iand: return LLVMConstInt(ctx->i64, -1, 0);
3899 case nir_op_ior: return ctx->i64_0;
3900 case nir_op_ixor: return ctx->i64_0;
3901 default:
3902 unreachable("bad reduction intrinsic");
3903 }
3904 }
3905 }
3906
3907 static LLVMValueRef
3908 ac_build_alu_op(struct ac_llvm_context *ctx, LLVMValueRef lhs, LLVMValueRef rhs, nir_op op)
3909 {
3910 bool _64bit = ac_get_type_size(LLVMTypeOf(lhs)) == 8;
3911 switch (op) {
3912 case nir_op_iadd: return LLVMBuildAdd(ctx->builder, lhs, rhs, "");
3913 case nir_op_fadd: return LLVMBuildFAdd(ctx->builder, lhs, rhs, "");
3914 case nir_op_imul: return LLVMBuildMul(ctx->builder, lhs, rhs, "");
3915 case nir_op_fmul: return LLVMBuildFMul(ctx->builder, lhs, rhs, "");
3916 case nir_op_imin: return LLVMBuildSelect(ctx->builder,
3917 LLVMBuildICmp(ctx->builder, LLVMIntSLT, lhs, rhs, ""),
3918 lhs, rhs, "");
3919 case nir_op_umin: return LLVMBuildSelect(ctx->builder,
3920 LLVMBuildICmp(ctx->builder, LLVMIntULT, lhs, rhs, ""),
3921 lhs, rhs, "");
3922 case nir_op_fmin: return ac_build_intrinsic(ctx,
3923 _64bit ? "llvm.minnum.f64" : "llvm.minnum.f32",
3924 _64bit ? ctx->f64 : ctx->f32,
3925 (LLVMValueRef[]){lhs, rhs}, 2, AC_FUNC_ATTR_READNONE);
3926 case nir_op_imax: return LLVMBuildSelect(ctx->builder,
3927 LLVMBuildICmp(ctx->builder, LLVMIntSGT, lhs, rhs, ""),
3928 lhs, rhs, "");
3929 case nir_op_umax: return LLVMBuildSelect(ctx->builder,
3930 LLVMBuildICmp(ctx->builder, LLVMIntUGT, lhs, rhs, ""),
3931 lhs, rhs, "");
3932 case nir_op_fmax: return ac_build_intrinsic(ctx,
3933 _64bit ? "llvm.maxnum.f64" : "llvm.maxnum.f32",
3934 _64bit ? ctx->f64 : ctx->f32,
3935 (LLVMValueRef[]){lhs, rhs}, 2, AC_FUNC_ATTR_READNONE);
3936 case nir_op_iand: return LLVMBuildAnd(ctx->builder, lhs, rhs, "");
3937 case nir_op_ior: return LLVMBuildOr(ctx->builder, lhs, rhs, "");
3938 case nir_op_ixor: return LLVMBuildXor(ctx->builder, lhs, rhs, "");
3939 default:
3940 unreachable("bad reduction intrinsic");
3941 }
3942 }
3943
3944 /**
3945 * \param maxprefix specifies that the result only needs to be correct for a
3946 * prefix of this many threads
3947 *
3948 * TODO: add inclusive and excluse scan functions for GFX6.
3949 */
3950 static LLVMValueRef
3951 ac_build_scan(struct ac_llvm_context *ctx, nir_op op, LLVMValueRef src, LLVMValueRef identity,
3952 unsigned maxprefix, bool inclusive)
3953 {
3954 LLVMValueRef result, tmp;
3955
3956 if (ctx->chip_class >= GFX10) {
3957 result = inclusive ? src : identity;
3958 } else {
3959 if (!inclusive)
3960 src = ac_build_dpp(ctx, identity, src, dpp_wf_sr1, 0xf, 0xf, false);
3961 result = src;
3962 }
3963 if (maxprefix <= 1)
3964 return result;
3965 tmp = ac_build_dpp(ctx, identity, src, dpp_row_sr(1), 0xf, 0xf, false);
3966 result = ac_build_alu_op(ctx, result, tmp, op);
3967 if (maxprefix <= 2)
3968 return result;
3969 tmp = ac_build_dpp(ctx, identity, src, dpp_row_sr(2), 0xf, 0xf, false);
3970 result = ac_build_alu_op(ctx, result, tmp, op);
3971 if (maxprefix <= 3)
3972 return result;
3973 tmp = ac_build_dpp(ctx, identity, src, dpp_row_sr(3), 0xf, 0xf, false);
3974 result = ac_build_alu_op(ctx, result, tmp, op);
3975 if (maxprefix <= 4)
3976 return result;
3977 tmp = ac_build_dpp(ctx, identity, result, dpp_row_sr(4), 0xf, 0xe, false);
3978 result = ac_build_alu_op(ctx, result, tmp, op);
3979 if (maxprefix <= 8)
3980 return result;
3981 tmp = ac_build_dpp(ctx, identity, result, dpp_row_sr(8), 0xf, 0xc, false);
3982 result = ac_build_alu_op(ctx, result, tmp, op);
3983 if (maxprefix <= 16)
3984 return result;
3985
3986 if (ctx->chip_class >= GFX10) {
3987 /* dpp_row_bcast{15,31} are not supported on gfx10. */
3988 LLVMBuilderRef builder = ctx->builder;
3989 LLVMValueRef tid = ac_get_thread_id(ctx);
3990 LLVMValueRef cc;
3991 /* TODO-GFX10: Can we get better code-gen by putting this into
3992 * a branch so that LLVM generates EXEC mask manipulations? */
3993 if (inclusive)
3994 tmp = result;
3995 else
3996 tmp = ac_build_alu_op(ctx, result, src, op);
3997 tmp = ac_build_permlane16(ctx, tmp, ~(uint64_t)0, true, false);
3998 tmp = ac_build_alu_op(ctx, result, tmp, op);
3999 cc = LLVMBuildAnd(builder, tid, LLVMConstInt(ctx->i32, 16, false), "");
4000 cc = LLVMBuildICmp(builder, LLVMIntNE, cc, ctx->i32_0, "");
4001 result = LLVMBuildSelect(builder, cc, tmp, result, "");
4002 if (maxprefix <= 32)
4003 return result;
4004
4005 if (inclusive)
4006 tmp = result;
4007 else
4008 tmp = ac_build_alu_op(ctx, result, src, op);
4009 tmp = ac_build_readlane(ctx, tmp, LLVMConstInt(ctx->i32, 31, false));
4010 tmp = ac_build_alu_op(ctx, result, tmp, op);
4011 cc = LLVMBuildICmp(builder, LLVMIntUGE, tid,
4012 LLVMConstInt(ctx->i32, 32, false), "");
4013 result = LLVMBuildSelect(builder, cc, tmp, result, "");
4014 return result;
4015 }
4016
4017 tmp = ac_build_dpp(ctx, identity, result, dpp_row_bcast15, 0xa, 0xf, false);
4018 result = ac_build_alu_op(ctx, result, tmp, op);
4019 if (maxprefix <= 32)
4020 return result;
4021 tmp = ac_build_dpp(ctx, identity, result, dpp_row_bcast31, 0xc, 0xf, false);
4022 result = ac_build_alu_op(ctx, result, tmp, op);
4023 return result;
4024 }
4025
4026 LLVMValueRef
4027 ac_build_inclusive_scan(struct ac_llvm_context *ctx, LLVMValueRef src, nir_op op)
4028 {
4029 LLVMValueRef result;
4030
4031 if (LLVMTypeOf(src) == ctx->i1 && op == nir_op_iadd) {
4032 LLVMBuilderRef builder = ctx->builder;
4033 src = LLVMBuildZExt(builder, src, ctx->i32, "");
4034 result = ac_build_ballot(ctx, src);
4035 result = ac_build_mbcnt(ctx, result);
4036 result = LLVMBuildAdd(builder, result, src, "");
4037 return result;
4038 }
4039
4040 ac_build_optimization_barrier(ctx, &src);
4041
4042 LLVMValueRef identity =
4043 get_reduction_identity(ctx, op, ac_get_type_size(LLVMTypeOf(src)));
4044 result = LLVMBuildBitCast(ctx->builder, ac_build_set_inactive(ctx, src, identity),
4045 LLVMTypeOf(identity), "");
4046 result = ac_build_scan(ctx, op, result, identity, ctx->wave_size, true);
4047
4048 return ac_build_wwm(ctx, result);
4049 }
4050
4051 LLVMValueRef
4052 ac_build_exclusive_scan(struct ac_llvm_context *ctx, LLVMValueRef src, nir_op op)
4053 {
4054 LLVMValueRef result;
4055
4056 if (LLVMTypeOf(src) == ctx->i1 && op == nir_op_iadd) {
4057 LLVMBuilderRef builder = ctx->builder;
4058 src = LLVMBuildZExt(builder, src, ctx->i32, "");
4059 result = ac_build_ballot(ctx, src);
4060 result = ac_build_mbcnt(ctx, result);
4061 return result;
4062 }
4063
4064 ac_build_optimization_barrier(ctx, &src);
4065
4066 LLVMValueRef identity =
4067 get_reduction_identity(ctx, op, ac_get_type_size(LLVMTypeOf(src)));
4068 result = LLVMBuildBitCast(ctx->builder, ac_build_set_inactive(ctx, src, identity),
4069 LLVMTypeOf(identity), "");
4070 result = ac_build_scan(ctx, op, result, identity, ctx->wave_size, false);
4071
4072 return ac_build_wwm(ctx, result);
4073 }
4074
4075 LLVMValueRef
4076 ac_build_reduce(struct ac_llvm_context *ctx, LLVMValueRef src, nir_op op, unsigned cluster_size)
4077 {
4078 if (cluster_size == 1) return src;
4079 ac_build_optimization_barrier(ctx, &src);
4080 LLVMValueRef result, swap;
4081 LLVMValueRef identity = get_reduction_identity(ctx, op,
4082 ac_get_type_size(LLVMTypeOf(src)));
4083 result = LLVMBuildBitCast(ctx->builder,
4084 ac_build_set_inactive(ctx, src, identity),
4085 LLVMTypeOf(identity), "");
4086 swap = ac_build_quad_swizzle(ctx, result, 1, 0, 3, 2);
4087 result = ac_build_alu_op(ctx, result, swap, op);
4088 if (cluster_size == 2) return ac_build_wwm(ctx, result);
4089
4090 swap = ac_build_quad_swizzle(ctx, result, 2, 3, 0, 1);
4091 result = ac_build_alu_op(ctx, result, swap, op);
4092 if (cluster_size == 4) return ac_build_wwm(ctx, result);
4093
4094 if (ctx->chip_class >= GFX8)
4095 swap = ac_build_dpp(ctx, identity, result, dpp_row_half_mirror, 0xf, 0xf, false);
4096 else
4097 swap = ac_build_ds_swizzle(ctx, result, ds_pattern_bitmode(0x1f, 0, 0x04));
4098 result = ac_build_alu_op(ctx, result, swap, op);
4099 if (cluster_size == 8) return ac_build_wwm(ctx, result);
4100
4101 if (ctx->chip_class >= GFX8)
4102 swap = ac_build_dpp(ctx, identity, result, dpp_row_mirror, 0xf, 0xf, false);
4103 else
4104 swap = ac_build_ds_swizzle(ctx, result, ds_pattern_bitmode(0x1f, 0, 0x08));
4105 result = ac_build_alu_op(ctx, result, swap, op);
4106 if (cluster_size == 16) return ac_build_wwm(ctx, result);
4107
4108 if (ctx->chip_class >= GFX10)
4109 swap = ac_build_permlane16(ctx, result, 0, true, false);
4110 else if (ctx->chip_class >= GFX8 && cluster_size != 32)
4111 swap = ac_build_dpp(ctx, identity, result, dpp_row_bcast15, 0xa, 0xf, false);
4112 else
4113 swap = ac_build_ds_swizzle(ctx, result, ds_pattern_bitmode(0x1f, 0, 0x10));
4114 result = ac_build_alu_op(ctx, result, swap, op);
4115 if (cluster_size == 32) return ac_build_wwm(ctx, result);
4116
4117 if (ctx->chip_class >= GFX8) {
4118 if (ctx->chip_class >= GFX10)
4119 swap = ac_build_readlane(ctx, result, LLVMConstInt(ctx->i32, 31, false));
4120 else
4121 swap = ac_build_dpp(ctx, identity, result, dpp_row_bcast31, 0xc, 0xf, false);
4122 result = ac_build_alu_op(ctx, result, swap, op);
4123 result = ac_build_readlane(ctx, result, LLVMConstInt(ctx->i32, 63, 0));
4124 return ac_build_wwm(ctx, result);
4125 } else {
4126 swap = ac_build_readlane(ctx, result, ctx->i32_0);
4127 result = ac_build_readlane(ctx, result, LLVMConstInt(ctx->i32, 32, 0));
4128 result = ac_build_alu_op(ctx, result, swap, op);
4129 return ac_build_wwm(ctx, result);
4130 }
4131 }
4132
4133 /**
4134 * "Top half" of a scan that reduces per-wave values across an entire
4135 * workgroup.
4136 *
4137 * The source value must be present in the highest lane of the wave, and the
4138 * highest lane must be live.
4139 */
4140 void
4141 ac_build_wg_wavescan_top(struct ac_llvm_context *ctx, struct ac_wg_scan *ws)
4142 {
4143 if (ws->maxwaves <= 1)
4144 return;
4145
4146 const LLVMValueRef last_lane = LLVMConstInt(ctx->i32, ctx->wave_size - 1, false);
4147 LLVMBuilderRef builder = ctx->builder;
4148 LLVMValueRef tid = ac_get_thread_id(ctx);
4149 LLVMValueRef tmp;
4150
4151 tmp = LLVMBuildICmp(builder, LLVMIntEQ, tid, last_lane, "");
4152 ac_build_ifcc(ctx, tmp, 1000);
4153 LLVMBuildStore(builder, ws->src, LLVMBuildGEP(builder, ws->scratch, &ws->waveidx, 1, ""));
4154 ac_build_endif(ctx, 1000);
4155 }
4156
4157 /**
4158 * "Bottom half" of a scan that reduces per-wave values across an entire
4159 * workgroup.
4160 *
4161 * The caller must place a barrier between the top and bottom halves.
4162 */
4163 void
4164 ac_build_wg_wavescan_bottom(struct ac_llvm_context *ctx, struct ac_wg_scan *ws)
4165 {
4166 const LLVMTypeRef type = LLVMTypeOf(ws->src);
4167 const LLVMValueRef identity =
4168 get_reduction_identity(ctx, ws->op, ac_get_type_size(type));
4169
4170 if (ws->maxwaves <= 1) {
4171 ws->result_reduce = ws->src;
4172 ws->result_inclusive = ws->src;
4173 ws->result_exclusive = identity;
4174 return;
4175 }
4176 assert(ws->maxwaves <= 32);
4177
4178 LLVMBuilderRef builder = ctx->builder;
4179 LLVMValueRef tid = ac_get_thread_id(ctx);
4180 LLVMBasicBlockRef bbs[2];
4181 LLVMValueRef phivalues_scan[2];
4182 LLVMValueRef tmp, tmp2;
4183
4184 bbs[0] = LLVMGetInsertBlock(builder);
4185 phivalues_scan[0] = LLVMGetUndef(type);
4186
4187 if (ws->enable_reduce)
4188 tmp = LLVMBuildICmp(builder, LLVMIntULT, tid, ws->numwaves, "");
4189 else if (ws->enable_inclusive)
4190 tmp = LLVMBuildICmp(builder, LLVMIntULE, tid, ws->waveidx, "");
4191 else
4192 tmp = LLVMBuildICmp(builder, LLVMIntULT, tid, ws->waveidx, "");
4193 ac_build_ifcc(ctx, tmp, 1001);
4194 {
4195 tmp = LLVMBuildLoad(builder, LLVMBuildGEP(builder, ws->scratch, &tid, 1, ""), "");
4196
4197 ac_build_optimization_barrier(ctx, &tmp);
4198
4199 bbs[1] = LLVMGetInsertBlock(builder);
4200 phivalues_scan[1] = ac_build_scan(ctx, ws->op, tmp, identity, ws->maxwaves, true);
4201 }
4202 ac_build_endif(ctx, 1001);
4203
4204 const LLVMValueRef scan = ac_build_phi(ctx, type, 2, phivalues_scan, bbs);
4205
4206 if (ws->enable_reduce) {
4207 tmp = LLVMBuildSub(builder, ws->numwaves, ctx->i32_1, "");
4208 ws->result_reduce = ac_build_readlane(ctx, scan, tmp);
4209 }
4210 if (ws->enable_inclusive)
4211 ws->result_inclusive = ac_build_readlane(ctx, scan, ws->waveidx);
4212 if (ws->enable_exclusive) {
4213 tmp = LLVMBuildSub(builder, ws->waveidx, ctx->i32_1, "");
4214 tmp = ac_build_readlane(ctx, scan, tmp);
4215 tmp2 = LLVMBuildICmp(builder, LLVMIntEQ, ws->waveidx, ctx->i32_0, "");
4216 ws->result_exclusive = LLVMBuildSelect(builder, tmp2, identity, tmp, "");
4217 }
4218 }
4219
4220 /**
4221 * Inclusive scan of a per-wave value across an entire workgroup.
4222 *
4223 * This implies an s_barrier instruction.
4224 *
4225 * Unlike ac_build_inclusive_scan, the caller \em must ensure that all threads
4226 * of the workgroup are live. (This requirement cannot easily be relaxed in a
4227 * useful manner because of the barrier in the algorithm.)
4228 */
4229 void
4230 ac_build_wg_wavescan(struct ac_llvm_context *ctx, struct ac_wg_scan *ws)
4231 {
4232 ac_build_wg_wavescan_top(ctx, ws);
4233 ac_build_s_barrier(ctx);
4234 ac_build_wg_wavescan_bottom(ctx, ws);
4235 }
4236
4237 /**
4238 * "Top half" of a scan that reduces per-thread values across an entire
4239 * workgroup.
4240 *
4241 * All lanes must be active when this code runs.
4242 */
4243 void
4244 ac_build_wg_scan_top(struct ac_llvm_context *ctx, struct ac_wg_scan *ws)
4245 {
4246 if (ws->enable_exclusive) {
4247 ws->extra = ac_build_exclusive_scan(ctx, ws->src, ws->op);
4248 if (LLVMTypeOf(ws->src) == ctx->i1 && ws->op == nir_op_iadd)
4249 ws->src = LLVMBuildZExt(ctx->builder, ws->src, ctx->i32, "");
4250 ws->src = ac_build_alu_op(ctx, ws->extra, ws->src, ws->op);
4251 } else {
4252 ws->src = ac_build_inclusive_scan(ctx, ws->src, ws->op);
4253 }
4254
4255 bool enable_inclusive = ws->enable_inclusive;
4256 bool enable_exclusive = ws->enable_exclusive;
4257 ws->enable_inclusive = false;
4258 ws->enable_exclusive = ws->enable_exclusive || enable_inclusive;
4259 ac_build_wg_wavescan_top(ctx, ws);
4260 ws->enable_inclusive = enable_inclusive;
4261 ws->enable_exclusive = enable_exclusive;
4262 }
4263
4264 /**
4265 * "Bottom half" of a scan that reduces per-thread values across an entire
4266 * workgroup.
4267 *
4268 * The caller must place a barrier between the top and bottom halves.
4269 */
4270 void
4271 ac_build_wg_scan_bottom(struct ac_llvm_context *ctx, struct ac_wg_scan *ws)
4272 {
4273 bool enable_inclusive = ws->enable_inclusive;
4274 bool enable_exclusive = ws->enable_exclusive;
4275 ws->enable_inclusive = false;
4276 ws->enable_exclusive = ws->enable_exclusive || enable_inclusive;
4277 ac_build_wg_wavescan_bottom(ctx, ws);
4278 ws->enable_inclusive = enable_inclusive;
4279 ws->enable_exclusive = enable_exclusive;
4280
4281 /* ws->result_reduce is already the correct value */
4282 if (ws->enable_inclusive)
4283 ws->result_inclusive = ac_build_alu_op(ctx, ws->result_inclusive, ws->src, ws->op);
4284 if (ws->enable_exclusive)
4285 ws->result_exclusive = ac_build_alu_op(ctx, ws->result_exclusive, ws->extra, ws->op);
4286 }
4287
4288 /**
4289 * A scan that reduces per-thread values across an entire workgroup.
4290 *
4291 * The caller must ensure that all lanes are active when this code runs
4292 * (WWM is insufficient!), because there is an implied barrier.
4293 */
4294 void
4295 ac_build_wg_scan(struct ac_llvm_context *ctx, struct ac_wg_scan *ws)
4296 {
4297 ac_build_wg_scan_top(ctx, ws);
4298 ac_build_s_barrier(ctx);
4299 ac_build_wg_scan_bottom(ctx, ws);
4300 }
4301
4302 LLVMValueRef
4303 ac_build_quad_swizzle(struct ac_llvm_context *ctx, LLVMValueRef src,
4304 unsigned lane0, unsigned lane1, unsigned lane2, unsigned lane3)
4305 {
4306 unsigned mask = dpp_quad_perm(lane0, lane1, lane2, lane3);
4307 if (ctx->chip_class >= GFX8) {
4308 return ac_build_dpp(ctx, src, src, mask, 0xf, 0xf, false);
4309 } else {
4310 return ac_build_ds_swizzle(ctx, src, (1 << 15) | mask);
4311 }
4312 }
4313
4314 LLVMValueRef
4315 ac_build_shuffle(struct ac_llvm_context *ctx, LLVMValueRef src, LLVMValueRef index)
4316 {
4317 index = LLVMBuildMul(ctx->builder, index, LLVMConstInt(ctx->i32, 4, 0), "");
4318 return ac_build_intrinsic(ctx,
4319 "llvm.amdgcn.ds.bpermute", ctx->i32,
4320 (LLVMValueRef []) {index, src}, 2,
4321 AC_FUNC_ATTR_READNONE |
4322 AC_FUNC_ATTR_CONVERGENT);
4323 }
4324
4325 LLVMValueRef
4326 ac_build_frexp_exp(struct ac_llvm_context *ctx, LLVMValueRef src0,
4327 unsigned bitsize)
4328 {
4329 LLVMTypeRef type;
4330 char *intr;
4331
4332 if (bitsize == 16) {
4333 intr = "llvm.amdgcn.frexp.exp.i16.f16";
4334 type = ctx->i16;
4335 } else if (bitsize == 32) {
4336 intr = "llvm.amdgcn.frexp.exp.i32.f32";
4337 type = ctx->i32;
4338 } else {
4339 intr = "llvm.amdgcn.frexp.exp.i32.f64";
4340 type = ctx->i32;
4341 }
4342
4343 LLVMValueRef params[] = {
4344 src0,
4345 };
4346 return ac_build_intrinsic(ctx, intr, type, params, 1,
4347 AC_FUNC_ATTR_READNONE);
4348 }
4349 LLVMValueRef
4350 ac_build_frexp_mant(struct ac_llvm_context *ctx, LLVMValueRef src0,
4351 unsigned bitsize)
4352 {
4353 LLVMTypeRef type;
4354 char *intr;
4355
4356 if (bitsize == 16) {
4357 intr = "llvm.amdgcn.frexp.mant.f16";
4358 type = ctx->f16;
4359 } else if (bitsize == 32) {
4360 intr = "llvm.amdgcn.frexp.mant.f32";
4361 type = ctx->f32;
4362 } else {
4363 intr = "llvm.amdgcn.frexp.mant.f64";
4364 type = ctx->f64;
4365 }
4366
4367 LLVMValueRef params[] = {
4368 src0,
4369 };
4370 return ac_build_intrinsic(ctx, intr, type, params, 1,
4371 AC_FUNC_ATTR_READNONE);
4372 }
4373
4374 LLVMValueRef
4375 ac_build_canonicalize(struct ac_llvm_context *ctx, LLVMValueRef src0,
4376 unsigned bitsize)
4377 {
4378 LLVMTypeRef type;
4379 char *intr;
4380
4381 if (bitsize == 16) {
4382 intr = "llvm.canonicalize.f16";
4383 type = ctx->f16;
4384 } else if (bitsize == 32) {
4385 intr = "llvm.canonicalize.f32";
4386 type = ctx->f32;
4387 } else if (bitsize == 64) {
4388 intr = "llvm.canonicalize.f64";
4389 type = ctx->f64;
4390 }
4391
4392 LLVMValueRef params[] = {
4393 src0,
4394 };
4395 return ac_build_intrinsic(ctx, intr, type, params, 1,
4396 AC_FUNC_ATTR_READNONE);
4397 }
4398
4399 /*
4400 * this takes an I,J coordinate pair,
4401 * and works out the X and Y derivatives.
4402 * it returns DDX(I), DDX(J), DDY(I), DDY(J).
4403 */
4404 LLVMValueRef
4405 ac_build_ddxy_interp(struct ac_llvm_context *ctx, LLVMValueRef interp_ij)
4406 {
4407 LLVMValueRef result[4], a;
4408 unsigned i;
4409
4410 for (i = 0; i < 2; i++) {
4411 a = LLVMBuildExtractElement(ctx->builder, interp_ij,
4412 LLVMConstInt(ctx->i32, i, false), "");
4413 result[i] = ac_build_ddxy(ctx, AC_TID_MASK_TOP_LEFT, 1, a);
4414 result[2+i] = ac_build_ddxy(ctx, AC_TID_MASK_TOP_LEFT, 2, a);
4415 }
4416 return ac_build_gather_values(ctx, result, 4);
4417 }
4418
4419 LLVMValueRef
4420 ac_build_load_helper_invocation(struct ac_llvm_context *ctx)
4421 {
4422 LLVMValueRef result = ac_build_intrinsic(ctx, "llvm.amdgcn.ps.live",
4423 ctx->i1, NULL, 0,
4424 AC_FUNC_ATTR_READNONE);
4425 result = LLVMBuildNot(ctx->builder, result, "");
4426 return LLVMBuildSExt(ctx->builder, result, ctx->i32, "");
4427 }
4428
4429 LLVMValueRef ac_build_call(struct ac_llvm_context *ctx, LLVMValueRef func,
4430 LLVMValueRef *args, unsigned num_args)
4431 {
4432 LLVMValueRef ret = LLVMBuildCall(ctx->builder, func, args, num_args, "");
4433 LLVMSetInstructionCallConv(ret, LLVMGetFunctionCallConv(func));
4434 return ret;
4435 }
4436
4437 void
4438 ac_export_mrt_z(struct ac_llvm_context *ctx, LLVMValueRef depth,
4439 LLVMValueRef stencil, LLVMValueRef samplemask,
4440 struct ac_export_args *args)
4441 {
4442 unsigned mask = 0;
4443 unsigned format = ac_get_spi_shader_z_format(depth != NULL,
4444 stencil != NULL,
4445 samplemask != NULL);
4446
4447 assert(depth || stencil || samplemask);
4448
4449 memset(args, 0, sizeof(*args));
4450
4451 args->valid_mask = 1; /* whether the EXEC mask is valid */
4452 args->done = 1; /* DONE bit */
4453
4454 /* Specify the target we are exporting */
4455 args->target = V_008DFC_SQ_EXP_MRTZ;
4456
4457 args->compr = 0; /* COMP flag */
4458 args->out[0] = LLVMGetUndef(ctx->f32); /* R, depth */
4459 args->out[1] = LLVMGetUndef(ctx->f32); /* G, stencil test val[0:7], stencil op val[8:15] */
4460 args->out[2] = LLVMGetUndef(ctx->f32); /* B, sample mask */
4461 args->out[3] = LLVMGetUndef(ctx->f32); /* A, alpha to mask */
4462
4463 if (format == V_028710_SPI_SHADER_UINT16_ABGR) {
4464 assert(!depth);
4465 args->compr = 1; /* COMPR flag */
4466
4467 if (stencil) {
4468 /* Stencil should be in X[23:16]. */
4469 stencil = ac_to_integer(ctx, stencil);
4470 stencil = LLVMBuildShl(ctx->builder, stencil,
4471 LLVMConstInt(ctx->i32, 16, 0), "");
4472 args->out[0] = ac_to_float(ctx, stencil);
4473 mask |= 0x3;
4474 }
4475 if (samplemask) {
4476 /* SampleMask should be in Y[15:0]. */
4477 args->out[1] = samplemask;
4478 mask |= 0xc;
4479 }
4480 } else {
4481 if (depth) {
4482 args->out[0] = depth;
4483 mask |= 0x1;
4484 }
4485 if (stencil) {
4486 args->out[1] = stencil;
4487 mask |= 0x2;
4488 }
4489 if (samplemask) {
4490 args->out[2] = samplemask;
4491 mask |= 0x4;
4492 }
4493 }
4494
4495 /* GFX6 (except OLAND and HAINAN) has a bug that it only looks
4496 * at the X writemask component. */
4497 if (ctx->chip_class == GFX6 &&
4498 ctx->family != CHIP_OLAND &&
4499 ctx->family != CHIP_HAINAN)
4500 mask |= 0x1;
4501
4502 /* Specify which components to enable */
4503 args->enabled_channels = mask;
4504 }
4505