src/intel/compiler/test_fs_saturate_propagation.cpp

   1 /*
   2  * Copyright © 2015 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #include <gtest/gtest.h>
  25 #include "brw_fs.h"
  26 #include "brw_cfg.h"
  27 #include "program/program.h"
  28
  29 using namespace brw;
  30
  31 class saturate_propagation_test : public ::testing::Test {
  32    virtual void SetUp();
  33
  34 public:
  35    struct brw_compiler *compiler;
  36    struct gen_device_info *devinfo;
  37    struct gl_context *ctx;
  38    struct brw_wm_prog_data *prog_data;
  39    struct gl_shader_program *shader_prog;
  40    fs_visitor *v;
  41 };
  42
  43 class saturate_propagation_fs_visitor : public fs_visitor
  44 {
  45 public:
  46    saturate_propagation_fs_visitor(struct brw_compiler *compiler,
  47                                    struct brw_wm_prog_data *prog_data,
  48                                    nir_shader *shader)
  49       : fs_visitor(compiler, NULL, NULL, NULL,
  50                    &prog_data->base, (struct gl_program *) NULL,
  51                    shader, 8, -1) {}
  52 };
  53
  54
  55 void saturate_propagation_test::SetUp()
  56 {
  57    ctx = (struct gl_context *)calloc(1, sizeof(*ctx));
  58    compiler = (struct brw_compiler *)calloc(1, sizeof(*compiler));
  59    devinfo = (struct gen_device_info *)calloc(1, sizeof(*devinfo));
  60    compiler->devinfo = devinfo;
  61
  62    prog_data = ralloc(NULL, struct brw_wm_prog_data);
  63    nir_shader *shader =
  64       nir_shader_create(NULL, MESA_SHADER_FRAGMENT, NULL, NULL);
  65
  66    v = new saturate_propagation_fs_visitor(compiler, prog_data, shader);
  67
  68    devinfo->gen = 4;
  69 }
  70
  71 static fs_inst *
  72 instruction(bblock_t *block, int num)
  73 {
  74    fs_inst *inst = (fs_inst *)block->start();
  75    for (int i = 0; i < num; i++) {
  76       inst = (fs_inst *)inst->next;
  77    }
  78    return inst;
  79 }
  80
  81 static bool
  82 saturate_propagation(fs_visitor *v)
  83 {
  84    const bool print = false;
  85
  86    if (print) {
  87       fprintf(stderr, "= Before =\n");
  88       v->cfg->dump(v);
  89    }
  90
  91    bool ret = v->opt_saturate_propagation();
  92
  93    if (print) {
  94       fprintf(stderr, "\n= After =\n");
  95       v->cfg->dump(v);
  96    }
  97
  98    return ret;
  99 }
 100
 101 TEST_F(saturate_propagation_test, basic)
 102 {
 103    const fs_builder &bld = v->bld;
 104    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 105    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 106    fs_reg src0 = v->vgrf(glsl_type::float_type);
 107    fs_reg src1 = v->vgrf(glsl_type::float_type);
 108    bld.ADD(dst0, src0, src1);
 109    set_saturate(true, bld.MOV(dst1, dst0));
 110
 111    /* = Before =
 112     *
 113     * 0: add(8)        dst0  src0  src1
 114     * 1: mov.sat(8)    dst1  dst0
 115     *
 116     * = After =
 117     * 0: add.sat(8)    dst0  src0  src1
 118     * 1: mov(8)        dst1  dst0
 119     */
 120
 121    v->calculate_cfg();
 122    bblock_t *block0 = v->cfg->blocks[0];
 123
 124    EXPECT_EQ(0, block0->start_ip);
 125    EXPECT_EQ(1, block0->end_ip);
 126
 127    EXPECT_TRUE(saturate_propagation(v));
 128    EXPECT_EQ(0, block0->start_ip);
 129    EXPECT_EQ(1, block0->end_ip);
 130    EXPECT_EQ(BRW_OPCODE_ADD, instruction(block0, 0)->opcode);
 131    EXPECT_TRUE(instruction(block0, 0)->saturate);
 132    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 133    EXPECT_FALSE(instruction(block0, 1)->saturate);
 134 }
 135
 136 TEST_F(saturate_propagation_test, other_non_saturated_use)
 137 {
 138    const fs_builder &bld = v->bld;
 139    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 140    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 141    fs_reg dst2 = v->vgrf(glsl_type::float_type);
 142    fs_reg src0 = v->vgrf(glsl_type::float_type);
 143    fs_reg src1 = v->vgrf(glsl_type::float_type);
 144    bld.ADD(dst0, src0, src1);
 145    set_saturate(true, bld.MOV(dst1, dst0));
 146    bld.ADD(dst2, dst0, src0);
 147
 148    /* = Before =
 149     *
 150     * 0: add(8)        dst0  src0  src1
 151     * 1: mov.sat(8)    dst1  dst0
 152     * 2: add(8)        dst2  dst0  src0
 153     *
 154     * = After =
 155     * (no changes)
 156     */
 157
 158    v->calculate_cfg();
 159    bblock_t *block0 = v->cfg->blocks[0];
 160
 161    EXPECT_EQ(0, block0->start_ip);
 162    EXPECT_EQ(2, block0->end_ip);
 163
 164    EXPECT_FALSE(saturate_propagation(v));
 165    EXPECT_EQ(0, block0->start_ip);
 166    EXPECT_EQ(2, block0->end_ip);
 167    EXPECT_EQ(BRW_OPCODE_ADD, instruction(block0, 0)->opcode);
 168    EXPECT_FALSE(instruction(block0, 0)->saturate);
 169    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 170    EXPECT_TRUE(instruction(block0, 1)->saturate);
 171    EXPECT_EQ(BRW_OPCODE_ADD, instruction(block0, 2)->opcode);
 172 }
 173
 174 TEST_F(saturate_propagation_test, predicated_instruction)
 175 {
 176    const fs_builder &bld = v->bld;
 177    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 178    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 179    fs_reg src0 = v->vgrf(glsl_type::float_type);
 180    fs_reg src1 = v->vgrf(glsl_type::float_type);
 181    bld.ADD(dst0, src0, src1)
 182       ->predicate = BRW_PREDICATE_NORMAL;
 183    set_saturate(true, bld.MOV(dst1, dst0));
 184
 185    /* = Before =
 186     *
 187     * 0: (+f0) add(8)  dst0  src0  src1
 188     * 1: mov.sat(8)    dst1  dst0
 189     *
 190     * = After =
 191     * (no changes)
 192     */
 193
 194    v->calculate_cfg();
 195    bblock_t *block0 = v->cfg->blocks[0];
 196
 197    EXPECT_EQ(0, block0->start_ip);
 198    EXPECT_EQ(1, block0->end_ip);
 199
 200    EXPECT_FALSE(saturate_propagation(v));
 201    EXPECT_EQ(0, block0->start_ip);
 202    EXPECT_EQ(1, block0->end_ip);
 203    EXPECT_EQ(BRW_OPCODE_ADD, instruction(block0, 0)->opcode);
 204    EXPECT_FALSE(instruction(block0, 0)->saturate);
 205    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 206    EXPECT_TRUE(instruction(block0, 1)->saturate);
 207 }
 208
 209 TEST_F(saturate_propagation_test, neg_mov_sat)
 210 {
 211    const fs_builder &bld = v->bld;
 212    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 213    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 214    fs_reg src0 = v->vgrf(glsl_type::float_type);
 215    bld.RNDU(dst0, src0);
 216    dst0.negate = true;
 217    set_saturate(true, bld.MOV(dst1, dst0));
 218
 219    /* = Before =
 220     *
 221     * 0: rndu(8)       dst0  src0
 222     * 1: mov.sat(8)    dst1  -dst0
 223     *
 224     * = After =
 225     * (no changes)
 226     */
 227
 228    v->calculate_cfg();
 229    bblock_t *block0 = v->cfg->blocks[0];
 230
 231    EXPECT_EQ(0, block0->start_ip);
 232    EXPECT_EQ(1, block0->end_ip);
 233
 234    EXPECT_FALSE(saturate_propagation(v));
 235    EXPECT_EQ(0, block0->start_ip);
 236    EXPECT_EQ(1, block0->end_ip);
 237    EXPECT_EQ(BRW_OPCODE_RNDU, instruction(block0, 0)->opcode);
 238    EXPECT_FALSE(instruction(block0, 0)->saturate);
 239    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 240    EXPECT_TRUE(instruction(block0, 1)->saturate);
 241 }
 242
 243 TEST_F(saturate_propagation_test, add_neg_mov_sat)
 244 {
 245    const fs_builder &bld = v->bld;
 246    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 247    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 248    fs_reg src0 = v->vgrf(glsl_type::float_type);
 249    fs_reg src1 = v->vgrf(glsl_type::float_type);
 250    bld.ADD(dst0, src0, src1);
 251    dst0.negate = true;
 252    set_saturate(true, bld.MOV(dst1, dst0));
 253
 254    /* = Before =
 255     *
 256     * 0: add(8)        dst0  src0  src1
 257     * 1: mov.sat(8)    dst1  -dst0
 258     *
 259     * = After =
 260     * 0: add.sat(8)    dst0  -src0 -src1
 261     * 1: mov(8)        dst1  dst0
 262     */
 263
 264    v->calculate_cfg();
 265    bblock_t *block0 = v->cfg->blocks[0];
 266
 267    EXPECT_EQ(0, block0->start_ip);
 268    EXPECT_EQ(1, block0->end_ip);
 269
 270    EXPECT_TRUE(saturate_propagation(v));
 271    EXPECT_EQ(0, block0->start_ip);
 272    EXPECT_EQ(1, block0->end_ip);
 273    EXPECT_EQ(BRW_OPCODE_ADD, instruction(block0, 0)->opcode);
 274    EXPECT_TRUE(instruction(block0, 0)->saturate);
 275    EXPECT_TRUE(instruction(block0, 0)->src[0].negate);
 276    EXPECT_TRUE(instruction(block0, 0)->src[1].negate);
 277    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 278    EXPECT_FALSE(instruction(block0, 1)->saturate);
 279 }
 280
 281 TEST_F(saturate_propagation_test, mul_neg_mov_sat)
 282 {
 283    const fs_builder &bld = v->bld;
 284    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 285    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 286    fs_reg src0 = v->vgrf(glsl_type::float_type);
 287    fs_reg src1 = v->vgrf(glsl_type::float_type);
 288    bld.MUL(dst0, src0, src1);
 289    dst0.negate = true;
 290    set_saturate(true, bld.MOV(dst1, dst0));
 291
 292    /* = Before =
 293     *
 294     * 0: mul(8)        dst0  src0  src1
 295     * 1: mov.sat(8)    dst1  -dst0
 296     *
 297     * = After =
 298     * 0: mul.sat(8)    dst0  src0 -src1
 299     * 1: mov(8)        dst1  dst0
 300     */
 301
 302    v->calculate_cfg();
 303    bblock_t *block0 = v->cfg->blocks[0];
 304
 305    EXPECT_EQ(0, block0->start_ip);
 306    EXPECT_EQ(1, block0->end_ip);
 307
 308    EXPECT_TRUE(saturate_propagation(v));
 309    EXPECT_EQ(0, block0->start_ip);
 310    EXPECT_EQ(1, block0->end_ip);
 311    EXPECT_EQ(BRW_OPCODE_MUL, instruction(block0, 0)->opcode);
 312    EXPECT_TRUE(instruction(block0, 0)->saturate);
 313    EXPECT_TRUE(instruction(block0, 0)->src[0].negate);
 314    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 315    EXPECT_FALSE(instruction(block0, 1)->saturate);
 316    EXPECT_FALSE(instruction(block0, 1)->src[0].negate);
 317 }
 318
 319 TEST_F(saturate_propagation_test, mul_mov_sat_neg_mov_sat)
 320 {
 321    const fs_builder &bld = v->bld;
 322    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 323    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 324    fs_reg dst2 = v->vgrf(glsl_type::float_type);
 325    fs_reg src0 = v->vgrf(glsl_type::float_type);
 326    fs_reg src1 = v->vgrf(glsl_type::float_type);
 327    bld.MUL(dst0, src0, src1);
 328    set_saturate(true, bld.MOV(dst1, dst0));
 329    dst0.negate = true;
 330    set_saturate(true, bld.MOV(dst2, dst0));
 331
 332    /* = Before =
 333     *
 334     * 0: mul(8)        dst0  src0  src1
 335     * 1: mov.sat(8)    dst1  dst0
 336     * 2: mov.sat(8)    dst2  -dst0
 337     *
 338     * = After =
 339     * (no changes)
 340     */
 341
 342    v->calculate_cfg();
 343    bblock_t *block0 = v->cfg->blocks[0];
 344
 345    EXPECT_EQ(0, block0->start_ip);
 346    EXPECT_EQ(2, block0->end_ip);
 347
 348    EXPECT_FALSE(saturate_propagation(v));
 349    EXPECT_EQ(0, block0->start_ip);
 350    EXPECT_EQ(2, block0->end_ip);
 351    EXPECT_EQ(BRW_OPCODE_MUL, instruction(block0, 0)->opcode);
 352    EXPECT_FALSE(instruction(block0, 0)->saturate);
 353    EXPECT_FALSE(instruction(block0, 0)->src[1].negate);
 354    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 355    EXPECT_TRUE(instruction(block0, 1)->saturate);
 356    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 2)->opcode);
 357    EXPECT_TRUE(instruction(block0, 2)->src[0].negate);
 358    EXPECT_TRUE(instruction(block0, 2)->saturate);
 359 }
 360
 361 TEST_F(saturate_propagation_test, mul_neg_mov_sat_neg_mov_sat)
 362 {
 363    const fs_builder &bld = v->bld;
 364    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 365    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 366    fs_reg dst2 = v->vgrf(glsl_type::float_type);
 367    fs_reg src0 = v->vgrf(glsl_type::float_type);
 368    fs_reg src1 = v->vgrf(glsl_type::float_type);
 369    bld.MUL(dst0, src0, src1);
 370    dst0.negate = true;
 371    set_saturate(true, bld.MOV(dst1, dst0));
 372    set_saturate(true, bld.MOV(dst2, dst0));
 373
 374    /* = Before =
 375     *
 376     * 0: mul(8)        dst0  src0  src1
 377     * 1: mov.sat(8)    dst1  -dst0
 378     * 2: mov.sat(8)    dst2  -dst0
 379     *
 380     * = After =
 381     * (no changes)
 382     */
 383
 384    v->calculate_cfg();
 385    bblock_t *block0 = v->cfg->blocks[0];
 386
 387    EXPECT_EQ(0, block0->start_ip);
 388    EXPECT_EQ(2, block0->end_ip);
 389
 390    EXPECT_FALSE(saturate_propagation(v));
 391    EXPECT_EQ(0, block0->start_ip);
 392    EXPECT_EQ(2, block0->end_ip);
 393    EXPECT_EQ(BRW_OPCODE_MUL, instruction(block0, 0)->opcode);
 394    EXPECT_FALSE(instruction(block0, 0)->saturate);
 395    EXPECT_FALSE(instruction(block0, 0)->src[1].negate);
 396    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 397    EXPECT_TRUE(instruction(block0, 1)->src[0].negate);
 398    EXPECT_TRUE(instruction(block0, 1)->saturate);
 399    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 2)->opcode);
 400    EXPECT_TRUE(instruction(block0, 2)->src[0].negate);
 401    EXPECT_TRUE(instruction(block0, 2)->saturate);
 402 }
 403
 404 TEST_F(saturate_propagation_test, abs_mov_sat)
 405 {
 406    const fs_builder &bld = v->bld;
 407    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 408    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 409    fs_reg src0 = v->vgrf(glsl_type::float_type);
 410    fs_reg src1 = v->vgrf(glsl_type::float_type);
 411    bld.ADD(dst0, src0, src1);
 412    dst0.abs = true;
 413    set_saturate(true, bld.MOV(dst1, dst0));
 414
 415    /* = Before =
 416     *
 417     * 0: add(8)        dst0  src0  src1
 418     * 1: mov.sat(8)    dst1  (abs)dst0
 419     *
 420     * = After =
 421     * (no changes)
 422     */
 423
 424    v->calculate_cfg();
 425    bblock_t *block0 = v->cfg->blocks[0];
 426
 427    EXPECT_EQ(0, block0->start_ip);
 428    EXPECT_EQ(1, block0->end_ip);
 429
 430    EXPECT_FALSE(saturate_propagation(v));
 431    EXPECT_EQ(0, block0->start_ip);
 432    EXPECT_EQ(1, block0->end_ip);
 433    EXPECT_EQ(BRW_OPCODE_ADD, instruction(block0, 0)->opcode);
 434    EXPECT_FALSE(instruction(block0, 0)->saturate);
 435    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 436    EXPECT_TRUE(instruction(block0, 1)->saturate);
 437 }
 438
 439 TEST_F(saturate_propagation_test, producer_saturates)
 440 {
 441    const fs_builder &bld = v->bld;
 442    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 443    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 444    fs_reg dst2 = v->vgrf(glsl_type::float_type);
 445    fs_reg src0 = v->vgrf(glsl_type::float_type);
 446    fs_reg src1 = v->vgrf(glsl_type::float_type);
 447    set_saturate(true, bld.ADD(dst0, src0, src1));
 448    set_saturate(true, bld.MOV(dst1, dst0));
 449    bld.MOV(dst2, dst0);
 450
 451    /* = Before =
 452     *
 453     * 0: add.sat(8)    dst0  src0  src1
 454     * 1: mov.sat(8)    dst1  dst0
 455     * 2: mov(8)        dst2  dst0
 456     *
 457     * = After =
 458     * 0: add.sat(8)    dst0  src0  src1
 459     * 1: mov(8)        dst1  dst0
 460     * 2: mov(8)        dst2  dst0
 461     */
 462
 463    v->calculate_cfg();
 464    bblock_t *block0 = v->cfg->blocks[0];
 465
 466    EXPECT_EQ(0, block0->start_ip);
 467    EXPECT_EQ(2, block0->end_ip);
 468
 469    EXPECT_TRUE(saturate_propagation(v));
 470    EXPECT_EQ(0, block0->start_ip);
 471    EXPECT_EQ(2, block0->end_ip);
 472    EXPECT_EQ(BRW_OPCODE_ADD, instruction(block0, 0)->opcode);
 473    EXPECT_TRUE(instruction(block0, 0)->saturate);
 474    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 475    EXPECT_FALSE(instruction(block0, 1)->saturate);
 476 }
 477
 478 TEST_F(saturate_propagation_test, intervening_saturating_copy)
 479 {
 480    const fs_builder &bld = v->bld;
 481    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 482    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 483    fs_reg dst2 = v->vgrf(glsl_type::float_type);
 484    fs_reg src0 = v->vgrf(glsl_type::float_type);
 485    fs_reg src1 = v->vgrf(glsl_type::float_type);
 486    bld.ADD(dst0, src0, src1);
 487    set_saturate(true, bld.MOV(dst1, dst0));
 488    set_saturate(true, bld.MOV(dst2, dst0));
 489
 490    /* = Before =
 491     *
 492     * 0: add(8)    dst0  src0  src1
 493     * 1: mov.sat(8)    dst1  dst0
 494     * 2: mov.sat(8)    dst2  dst0
 495     *
 496     * = After =
 497     * 0: add.sat(8)    dst0  src0  src1
 498     * 1: mov(8)        dst1  dst0
 499     * 2: mov(8)        dst2  dst0
 500     */
 501
 502    v->calculate_cfg();
 503    bblock_t *block0 = v->cfg->blocks[0];
 504
 505    EXPECT_EQ(0, block0->start_ip);
 506    EXPECT_EQ(2, block0->end_ip);
 507
 508    EXPECT_TRUE(saturate_propagation(v));
 509    EXPECT_EQ(0, block0->start_ip);
 510    EXPECT_EQ(2, block0->end_ip);
 511    EXPECT_EQ(BRW_OPCODE_ADD, instruction(block0, 0)->opcode);
 512    EXPECT_TRUE(instruction(block0, 0)->saturate);
 513    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 514    EXPECT_FALSE(instruction(block0, 1)->saturate);
 515    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 2)->opcode);
 516    EXPECT_FALSE(instruction(block0, 2)->saturate);
 517 }
 518
 519 TEST_F(saturate_propagation_test, intervening_dest_write)
 520 {
 521    const fs_builder &bld = v->bld;
 522    fs_reg dst0 = v->vgrf(glsl_type::vec4_type);
 523    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 524    fs_reg src0 = v->vgrf(glsl_type::float_type);
 525    fs_reg src1 = v->vgrf(glsl_type::float_type);
 526    fs_reg src2 = v->vgrf(glsl_type::vec2_type);
 527    bld.ADD(offset(dst0, bld, 2), src0, src1);
 528    bld.emit(SHADER_OPCODE_TEX, dst0, src2)
 529       ->size_written = 4 * REG_SIZE;
 530    set_saturate(true, bld.MOV(dst1, offset(dst0, bld, 2)));
 531
 532    /* = Before =
 533     *
 534     * 0: add(8)        dst0+2  src0    src1
 535     * 1: tex(8) rlen 4 dst0+0  src2
 536     * 2: mov.sat(8)    dst1    dst0+2
 537     *
 538     * = After =
 539     * (no changes)
 540     */
 541
 542    v->calculate_cfg();
 543    bblock_t *block0 = v->cfg->blocks[0];
 544
 545    EXPECT_EQ(0, block0->start_ip);
 546    EXPECT_EQ(2, block0->end_ip);
 547
 548    EXPECT_FALSE(saturate_propagation(v));
 549    EXPECT_EQ(0, block0->start_ip);
 550    EXPECT_EQ(2, block0->end_ip);
 551    EXPECT_EQ(BRW_OPCODE_ADD, instruction(block0, 0)->opcode);
 552    EXPECT_FALSE(instruction(block0, 0)->saturate);
 553    EXPECT_EQ(SHADER_OPCODE_TEX, instruction(block0, 1)->opcode);
 554    EXPECT_FALSE(instruction(block0, 0)->saturate);
 555    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 2)->opcode);
 556    EXPECT_TRUE(instruction(block0, 2)->saturate);
 557 }
 558
 559 TEST_F(saturate_propagation_test, mul_neg_mov_sat_mov_sat)
 560 {
 561    const fs_builder &bld = v->bld;
 562    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 563    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 564    fs_reg dst2 = v->vgrf(glsl_type::float_type);
 565    fs_reg src0 = v->vgrf(glsl_type::float_type);
 566    fs_reg src1 = v->vgrf(glsl_type::float_type);
 567    bld.MUL(dst0, src0, src1);
 568    dst0.negate = true;
 569    set_saturate(true, bld.MOV(dst1, dst0));
 570    dst0.negate = false;
 571    set_saturate(true, bld.MOV(dst2, dst0));
 572
 573    /* = Before =
 574     *
 575     * 0: mul(8)        dst0  src0  src1
 576     * 1: mov.sat(8)    dst1  -dst0
 577     * 2: mov.sat(8)    dst2  dst0
 578     *
 579     * = After =
 580     * (no changes)
 581     */
 582
 583    v->calculate_cfg();
 584    bblock_t *block0 = v->cfg->blocks[0];
 585
 586    EXPECT_EQ(0, block0->start_ip);
 587    EXPECT_EQ(2, block0->end_ip);
 588
 589    EXPECT_FALSE(saturate_propagation(v));
 590    EXPECT_EQ(0, block0->start_ip);
 591    EXPECT_EQ(2, block0->end_ip);
 592    EXPECT_EQ(BRW_OPCODE_MUL, instruction(block0, 0)->opcode);
 593    EXPECT_FALSE(instruction(block0, 0)->saturate);
 594    EXPECT_FALSE(instruction(block0, 0)->src[1].negate);
 595    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 596    EXPECT_TRUE(instruction(block0, 1)->saturate);
 597    EXPECT_TRUE(instruction(block0, 1)->src[0].negate);
 598    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 2)->opcode);
 599    EXPECT_TRUE(instruction(block0, 2)->saturate);
 600 }