src/mesa/drivers/dri/i965/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 brw_device_info *devinfo;
  37    struct gl_context *ctx;
  38    struct brw_wm_prog_data *prog_data;
  39    struct gl_shader_program *shader_prog;
  40    struct brw_fragment_program *fp;
  41    fs_visitor *v;
  42 };
  43
  44 class saturate_propagation_fs_visitor : public fs_visitor
  45 {
  46 public:
  47    saturate_propagation_fs_visitor(struct brw_compiler *compiler,
  48                                    struct brw_wm_prog_data *prog_data,
  49                                    nir_shader *shader)
  50       : fs_visitor(compiler, NULL, NULL, NULL,
  51                    &prog_data->base, (struct gl_program *) NULL,
  52                    shader, 8, -1) {}
  53 };
  54
  55
  56 void saturate_propagation_test::SetUp()
  57 {
  58    ctx = (struct gl_context *)calloc(1, sizeof(*ctx));
  59    compiler = (struct brw_compiler *)calloc(1, sizeof(*compiler));
  60    devinfo = (struct brw_device_info *)calloc(1, sizeof(*devinfo));
  61    compiler->devinfo = devinfo;
  62
  63    fp = ralloc(NULL, struct brw_fragment_program);
  64    prog_data = ralloc(NULL, struct brw_wm_prog_data);
  65    nir_shader *shader = nir_shader_create(NULL, MESA_SHADER_FRAGMENT, NULL);
  66
  67    v = new saturate_propagation_fs_visitor(compiler, prog_data, shader);
  68
  69    _mesa_init_gl_program(&fp->program.Base, GL_FRAGMENT_SHADER, 0);
  70
  71    devinfo->gen = 4;
  72 }
  73
  74 static fs_inst *
  75 instruction(bblock_t *block, int num)
  76 {
  77    fs_inst *inst = (fs_inst *)block->start();
  78    for (int i = 0; i < num; i++) {
  79       inst = (fs_inst *)inst->next;
  80    }
  81    return inst;
  82 }
  83
  84 static bool
  85 saturate_propagation(fs_visitor *v)
  86 {
  87    const bool print = false;
  88
  89    if (print) {
  90       fprintf(stderr, "= Before =\n");
  91       v->cfg->dump(v);
  92    }
  93
  94    bool ret = v->opt_saturate_propagation();
  95
  96    if (print) {
  97       fprintf(stderr, "\n= After =\n");
  98       v->cfg->dump(v);
  99    }
 100
 101    return ret;
 102 }
 103
 104 TEST_F(saturate_propagation_test, basic)
 105 {
 106    const fs_builder &bld = v->bld;
 107    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 108    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 109    fs_reg src0 = v->vgrf(glsl_type::float_type);
 110    fs_reg src1 = v->vgrf(glsl_type::float_type);
 111    bld.ADD(dst0, src0, src1);
 112    set_saturate(true, bld.MOV(dst1, dst0));
 113
 114    /* = Before =
 115     *
 116     * 0: add(8)        dst0  src0  src1
 117     * 1: mov.sat(8)    dst1  dst0
 118     *
 119     * = After =
 120     * 0: add.sat(8)    dst0  src0  src1
 121     * 1: mov(8)        dst1  dst0
 122     */
 123
 124    v->calculate_cfg();
 125    bblock_t *block0 = v->cfg->blocks[0];
 126
 127    EXPECT_EQ(0, block0->start_ip);
 128    EXPECT_EQ(1, block0->end_ip);
 129
 130    EXPECT_TRUE(saturate_propagation(v));
 131    EXPECT_EQ(0, block0->start_ip);
 132    EXPECT_EQ(1, block0->end_ip);
 133    EXPECT_EQ(BRW_OPCODE_ADD, instruction(block0, 0)->opcode);
 134    EXPECT_TRUE(instruction(block0, 0)->saturate);
 135    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 136    EXPECT_FALSE(instruction(block0, 1)->saturate);
 137 }
 138
 139 TEST_F(saturate_propagation_test, other_non_saturated_use)
 140 {
 141    const fs_builder &bld = v->bld;
 142    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 143    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 144    fs_reg dst2 = v->vgrf(glsl_type::float_type);
 145    fs_reg src0 = v->vgrf(glsl_type::float_type);
 146    fs_reg src1 = v->vgrf(glsl_type::float_type);
 147    bld.ADD(dst0, src0, src1);
 148    set_saturate(true, bld.MOV(dst1, dst0));
 149    bld.ADD(dst2, dst0, src0);
 150
 151    /* = Before =
 152     *
 153     * 0: add(8)        dst0  src0  src1
 154     * 1: mov.sat(8)    dst1  dst0
 155     * 2: add(8)        dst2  dst0  src0
 156     *
 157     * = After =
 158     * (no changes)
 159     */
 160
 161    v->calculate_cfg();
 162    bblock_t *block0 = v->cfg->blocks[0];
 163
 164    EXPECT_EQ(0, block0->start_ip);
 165    EXPECT_EQ(2, block0->end_ip);
 166
 167    EXPECT_FALSE(saturate_propagation(v));
 168    EXPECT_EQ(0, block0->start_ip);
 169    EXPECT_EQ(2, block0->end_ip);
 170    EXPECT_EQ(BRW_OPCODE_ADD, instruction(block0, 0)->opcode);
 171    EXPECT_FALSE(instruction(block0, 0)->saturate);
 172    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 173    EXPECT_TRUE(instruction(block0, 1)->saturate);
 174    EXPECT_EQ(BRW_OPCODE_ADD, instruction(block0, 2)->opcode);
 175 }
 176
 177 TEST_F(saturate_propagation_test, predicated_instruction)
 178 {
 179    const fs_builder &bld = v->bld;
 180    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 181    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 182    fs_reg src0 = v->vgrf(glsl_type::float_type);
 183    fs_reg src1 = v->vgrf(glsl_type::float_type);
 184    bld.ADD(dst0, src0, src1)
 185       ->predicate = BRW_PREDICATE_NORMAL;
 186    set_saturate(true, bld.MOV(dst1, dst0));
 187
 188    /* = Before =
 189     *
 190     * 0: (+f0) add(8)  dst0  src0  src1
 191     * 1: mov.sat(8)    dst1  dst0
 192     *
 193     * = After =
 194     * (no changes)
 195     */
 196
 197    v->calculate_cfg();
 198    bblock_t *block0 = v->cfg->blocks[0];
 199
 200    EXPECT_EQ(0, block0->start_ip);
 201    EXPECT_EQ(1, block0->end_ip);
 202
 203    EXPECT_FALSE(saturate_propagation(v));
 204    EXPECT_EQ(0, block0->start_ip);
 205    EXPECT_EQ(1, block0->end_ip);
 206    EXPECT_EQ(BRW_OPCODE_ADD, instruction(block0, 0)->opcode);
 207    EXPECT_FALSE(instruction(block0, 0)->saturate);
 208    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 209    EXPECT_TRUE(instruction(block0, 1)->saturate);
 210 }
 211
 212 TEST_F(saturate_propagation_test, neg_mov_sat)
 213 {
 214    const fs_builder &bld = v->bld;
 215    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 216    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 217    fs_reg src0 = v->vgrf(glsl_type::float_type);
 218    bld.RNDU(dst0, src0);
 219    dst0.negate = true;
 220    set_saturate(true, bld.MOV(dst1, dst0));
 221
 222    /* = Before =
 223     *
 224     * 0: rndu(8)       dst0  src0
 225     * 1: mov.sat(8)    dst1  -dst0
 226     *
 227     * = After =
 228     * (no changes)
 229     */
 230
 231    v->calculate_cfg();
 232    bblock_t *block0 = v->cfg->blocks[0];
 233
 234    EXPECT_EQ(0, block0->start_ip);
 235    EXPECT_EQ(1, block0->end_ip);
 236
 237    EXPECT_FALSE(saturate_propagation(v));
 238    EXPECT_EQ(0, block0->start_ip);
 239    EXPECT_EQ(1, block0->end_ip);
 240    EXPECT_EQ(BRW_OPCODE_RNDU, instruction(block0, 0)->opcode);
 241    EXPECT_FALSE(instruction(block0, 0)->saturate);
 242    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 243    EXPECT_TRUE(instruction(block0, 1)->saturate);
 244 }
 245
 246 TEST_F(saturate_propagation_test, add_neg_mov_sat)
 247 {
 248    const fs_builder &bld = v->bld;
 249    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 250    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 251    fs_reg src0 = v->vgrf(glsl_type::float_type);
 252    fs_reg src1 = v->vgrf(glsl_type::float_type);
 253    bld.ADD(dst0, src0, src1);
 254    dst0.negate = true;
 255    set_saturate(true, bld.MOV(dst1, dst0));
 256
 257    /* = Before =
 258     *
 259     * 0: add(8)        dst0  src0  src1
 260     * 1: mov.sat(8)    dst1  -dst0
 261     *
 262     * = After =
 263     * 0: add.sat(8)    dst0  -src0 -src1
 264     * 1: mov(8)        dst1  dst0
 265     */
 266
 267    v->calculate_cfg();
 268    bblock_t *block0 = v->cfg->blocks[0];
 269
 270    EXPECT_EQ(0, block0->start_ip);
 271    EXPECT_EQ(1, block0->end_ip);
 272
 273    EXPECT_TRUE(saturate_propagation(v));
 274    EXPECT_EQ(0, block0->start_ip);
 275    EXPECT_EQ(1, block0->end_ip);
 276    EXPECT_EQ(BRW_OPCODE_ADD, instruction(block0, 0)->opcode);
 277    EXPECT_TRUE(instruction(block0, 0)->saturate);
 278    EXPECT_TRUE(instruction(block0, 0)->src[0].negate);
 279    EXPECT_TRUE(instruction(block0, 0)->src[1].negate);
 280    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 281    EXPECT_FALSE(instruction(block0, 1)->saturate);
 282 }
 283
 284 TEST_F(saturate_propagation_test, mul_neg_mov_sat)
 285 {
 286    const fs_builder &bld = v->bld;
 287    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 288    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 289    fs_reg src0 = v->vgrf(glsl_type::float_type);
 290    fs_reg src1 = v->vgrf(glsl_type::float_type);
 291    bld.MUL(dst0, src0, src1);
 292    dst0.negate = true;
 293    set_saturate(true, bld.MOV(dst1, dst0));
 294
 295    /* = Before =
 296     *
 297     * 0: mul(8)        dst0  src0  src1
 298     * 1: mov.sat(8)    dst1  -dst0
 299     *
 300     * = After =
 301     * 0: mul.sat(8)    dst0  src0 -src1
 302     * 1: mov(8)        dst1  dst0
 303     */
 304
 305    v->calculate_cfg();
 306    bblock_t *block0 = v->cfg->blocks[0];
 307
 308    EXPECT_EQ(0, block0->start_ip);
 309    EXPECT_EQ(1, block0->end_ip);
 310
 311    EXPECT_TRUE(saturate_propagation(v));
 312    EXPECT_EQ(0, block0->start_ip);
 313    EXPECT_EQ(1, block0->end_ip);
 314    EXPECT_EQ(BRW_OPCODE_MUL, instruction(block0, 0)->opcode);
 315    EXPECT_TRUE(instruction(block0, 0)->saturate);
 316    EXPECT_TRUE(instruction(block0, 0)->src[0].negate);
 317    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 318    EXPECT_FALSE(instruction(block0, 1)->saturate);
 319    EXPECT_FALSE(instruction(block0, 1)->src[0].negate);
 320 }
 321
 322 TEST_F(saturate_propagation_test, mul_mov_sat_neg_mov_sat)
 323 {
 324    const fs_builder &bld = v->bld;
 325    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 326    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 327    fs_reg dst2 = v->vgrf(glsl_type::float_type);
 328    fs_reg src0 = v->vgrf(glsl_type::float_type);
 329    fs_reg src1 = v->vgrf(glsl_type::float_type);
 330    bld.MUL(dst0, src0, src1);
 331    set_saturate(true, bld.MOV(dst1, dst0));
 332    dst0.negate = true;
 333    set_saturate(true, bld.MOV(dst2, dst0));
 334
 335    /* = Before =
 336     *
 337     * 0: mul(8)        dst0  src0  src1
 338     * 1: mov.sat(8)    dst1  dst0
 339     * 2: mov.sat(8)    dst2  -dst0
 340     *
 341     * = After =
 342     * (no changes)
 343     */
 344
 345    v->calculate_cfg();
 346    bblock_t *block0 = v->cfg->blocks[0];
 347
 348    EXPECT_EQ(0, block0->start_ip);
 349    EXPECT_EQ(2, block0->end_ip);
 350
 351    EXPECT_FALSE(saturate_propagation(v));
 352    EXPECT_EQ(0, block0->start_ip);
 353    EXPECT_EQ(2, block0->end_ip);
 354    EXPECT_EQ(BRW_OPCODE_MUL, instruction(block0, 0)->opcode);
 355    EXPECT_FALSE(instruction(block0, 0)->saturate);
 356    EXPECT_FALSE(instruction(block0, 0)->src[1].negate);
 357    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 358    EXPECT_TRUE(instruction(block0, 1)->saturate);
 359    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 2)->opcode);
 360    EXPECT_TRUE(instruction(block0, 2)->src[0].negate);
 361    EXPECT_TRUE(instruction(block0, 2)->saturate);
 362 }
 363
 364 TEST_F(saturate_propagation_test, mul_neg_mov_sat_neg_mov_sat)
 365 {
 366    const fs_builder &bld = v->bld;
 367    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 368    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 369    fs_reg dst2 = v->vgrf(glsl_type::float_type);
 370    fs_reg src0 = v->vgrf(glsl_type::float_type);
 371    fs_reg src1 = v->vgrf(glsl_type::float_type);
 372    bld.MUL(dst0, src0, src1);
 373    dst0.negate = true;
 374    set_saturate(true, bld.MOV(dst1, dst0));
 375    set_saturate(true, bld.MOV(dst2, dst0));
 376
 377    /* = Before =
 378     *
 379     * 0: mul(8)        dst0  src0  src1
 380     * 1: mov.sat(8)    dst1  -dst0
 381     * 2: mov.sat(8)    dst2  -dst0
 382     *
 383     * = After =
 384     * (no changes)
 385     */
 386
 387    v->calculate_cfg();
 388    bblock_t *block0 = v->cfg->blocks[0];
 389
 390    EXPECT_EQ(0, block0->start_ip);
 391    EXPECT_EQ(2, block0->end_ip);
 392
 393    EXPECT_FALSE(saturate_propagation(v));
 394    EXPECT_EQ(0, block0->start_ip);
 395    EXPECT_EQ(2, block0->end_ip);
 396    EXPECT_EQ(BRW_OPCODE_MUL, instruction(block0, 0)->opcode);
 397    EXPECT_FALSE(instruction(block0, 0)->saturate);
 398    EXPECT_FALSE(instruction(block0, 0)->src[1].negate);
 399    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 400    EXPECT_TRUE(instruction(block0, 1)->src[0].negate);
 401    EXPECT_TRUE(instruction(block0, 1)->saturate);
 402    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 2)->opcode);
 403    EXPECT_TRUE(instruction(block0, 2)->src[0].negate);
 404    EXPECT_TRUE(instruction(block0, 2)->saturate);
 405 }
 406
 407 TEST_F(saturate_propagation_test, abs_mov_sat)
 408 {
 409    const fs_builder &bld = v->bld;
 410    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 411    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 412    fs_reg src0 = v->vgrf(glsl_type::float_type);
 413    fs_reg src1 = v->vgrf(glsl_type::float_type);
 414    bld.ADD(dst0, src0, src1);
 415    dst0.abs = true;
 416    set_saturate(true, bld.MOV(dst1, dst0));
 417
 418    /* = Before =
 419     *
 420     * 0: add(8)        dst0  src0  src1
 421     * 1: mov.sat(8)    dst1  (abs)dst0
 422     *
 423     * = After =
 424     * (no changes)
 425     */
 426
 427    v->calculate_cfg();
 428    bblock_t *block0 = v->cfg->blocks[0];
 429
 430    EXPECT_EQ(0, block0->start_ip);
 431    EXPECT_EQ(1, block0->end_ip);
 432
 433    EXPECT_FALSE(saturate_propagation(v));
 434    EXPECT_EQ(0, block0->start_ip);
 435    EXPECT_EQ(1, block0->end_ip);
 436    EXPECT_EQ(BRW_OPCODE_ADD, instruction(block0, 0)->opcode);
 437    EXPECT_FALSE(instruction(block0, 0)->saturate);
 438    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 439    EXPECT_TRUE(instruction(block0, 1)->saturate);
 440 }
 441
 442 TEST_F(saturate_propagation_test, producer_saturates)
 443 {
 444    const fs_builder &bld = v->bld;
 445    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 446    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 447    fs_reg dst2 = v->vgrf(glsl_type::float_type);
 448    fs_reg src0 = v->vgrf(glsl_type::float_type);
 449    fs_reg src1 = v->vgrf(glsl_type::float_type);
 450    set_saturate(true, bld.ADD(dst0, src0, src1));
 451    set_saturate(true, bld.MOV(dst1, dst0));
 452    bld.MOV(dst2, dst0);
 453
 454    /* = Before =
 455     *
 456     * 0: add.sat(8)    dst0  src0  src1
 457     * 1: mov.sat(8)    dst1  dst0
 458     * 2: mov(8)        dst2  dst0
 459     *
 460     * = After =
 461     * 0: add.sat(8)    dst0  src0  src1
 462     * 1: mov(8)        dst1  dst0
 463     * 2: mov(8)        dst2  dst0
 464     */
 465
 466    v->calculate_cfg();
 467    bblock_t *block0 = v->cfg->blocks[0];
 468
 469    EXPECT_EQ(0, block0->start_ip);
 470    EXPECT_EQ(2, block0->end_ip);
 471
 472    EXPECT_TRUE(saturate_propagation(v));
 473    EXPECT_EQ(0, block0->start_ip);
 474    EXPECT_EQ(2, block0->end_ip);
 475    EXPECT_EQ(BRW_OPCODE_ADD, instruction(block0, 0)->opcode);
 476    EXPECT_TRUE(instruction(block0, 0)->saturate);
 477    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 478    EXPECT_FALSE(instruction(block0, 1)->saturate);
 479 }
 480
 481 TEST_F(saturate_propagation_test, intervening_saturating_copy)
 482 {
 483    const fs_builder &bld = v->bld;
 484    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 485    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 486    fs_reg dst2 = v->vgrf(glsl_type::float_type);
 487    fs_reg src0 = v->vgrf(glsl_type::float_type);
 488    fs_reg src1 = v->vgrf(glsl_type::float_type);
 489    bld.ADD(dst0, src0, src1);
 490    set_saturate(true, bld.MOV(dst1, dst0));
 491    set_saturate(true, bld.MOV(dst2, dst0));
 492
 493    /* = Before =
 494     *
 495     * 0: add(8)    dst0  src0  src1
 496     * 1: mov.sat(8)    dst1  dst0
 497     * 2: mov.sat(8)    dst2  dst0
 498     *
 499     * = After =
 500     * 0: add.sat(8)    dst0  src0  src1
 501     * 1: mov(8)        dst1  dst0
 502     * 2: mov(8)        dst2  dst0
 503     */
 504
 505    v->calculate_cfg();
 506    bblock_t *block0 = v->cfg->blocks[0];
 507
 508    EXPECT_EQ(0, block0->start_ip);
 509    EXPECT_EQ(2, block0->end_ip);
 510
 511    EXPECT_TRUE(saturate_propagation(v));
 512    EXPECT_EQ(0, block0->start_ip);
 513    EXPECT_EQ(2, block0->end_ip);
 514    EXPECT_EQ(BRW_OPCODE_ADD, instruction(block0, 0)->opcode);
 515    EXPECT_TRUE(instruction(block0, 0)->saturate);
 516    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 517    EXPECT_FALSE(instruction(block0, 1)->saturate);
 518    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 2)->opcode);
 519    EXPECT_FALSE(instruction(block0, 2)->saturate);
 520 }
 521
 522 TEST_F(saturate_propagation_test, intervening_dest_write)
 523 {
 524    const fs_builder &bld = v->bld;
 525    fs_reg dst0 = v->vgrf(glsl_type::vec4_type);
 526    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 527    fs_reg src0 = v->vgrf(glsl_type::float_type);
 528    fs_reg src1 = v->vgrf(glsl_type::float_type);
 529    fs_reg src2 = v->vgrf(glsl_type::vec2_type);
 530    bld.ADD(offset(dst0, bld, 2), src0, src1);
 531    bld.emit(SHADER_OPCODE_TEX, dst0, src2)
 532       ->regs_written = 4;
 533    set_saturate(true, bld.MOV(dst1, offset(dst0, bld, 2)));
 534
 535    /* = Before =
 536     *
 537     * 0: add(8)        dst0+2  src0    src1
 538     * 1: tex(8) rlen 4 dst0+0  src2
 539     * 2: mov.sat(8)    dst1    dst0+2
 540     *
 541     * = After =
 542     * (no changes)
 543     */
 544
 545    v->calculate_cfg();
 546    bblock_t *block0 = v->cfg->blocks[0];
 547
 548    EXPECT_EQ(0, block0->start_ip);
 549    EXPECT_EQ(2, block0->end_ip);
 550
 551    EXPECT_FALSE(saturate_propagation(v));
 552    EXPECT_EQ(0, block0->start_ip);
 553    EXPECT_EQ(2, block0->end_ip);
 554    EXPECT_EQ(BRW_OPCODE_ADD, instruction(block0, 0)->opcode);
 555    EXPECT_FALSE(instruction(block0, 0)->saturate);
 556    EXPECT_EQ(SHADER_OPCODE_TEX, instruction(block0, 1)->opcode);
 557    EXPECT_FALSE(instruction(block0, 0)->saturate);
 558    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 2)->opcode);
 559    EXPECT_TRUE(instruction(block0, 2)->saturate);
 560 }
 561
 562 TEST_F(saturate_propagation_test, mul_neg_mov_sat_mov_sat)
 563 {
 564    const fs_builder &bld = v->bld;
 565    fs_reg dst0 = v->vgrf(glsl_type::float_type);
 566    fs_reg dst1 = v->vgrf(glsl_type::float_type);
 567    fs_reg dst2 = v->vgrf(glsl_type::float_type);
 568    fs_reg src0 = v->vgrf(glsl_type::float_type);
 569    fs_reg src1 = v->vgrf(glsl_type::float_type);
 570    bld.MUL(dst0, src0, src1);
 571    dst0.negate = true;
 572    set_saturate(true, bld.MOV(dst1, dst0));
 573    dst0.negate = false;
 574    set_saturate(true, bld.MOV(dst2, dst0));
 575
 576    /* = Before =
 577     *
 578     * 0: mul(8)        dst0  src0  src1
 579     * 1: mov.sat(8)    dst1  -dst0
 580     * 2: mov.sat(8)    dst2  dst0
 581     *
 582     * = After =
 583     * (no changes)
 584     */
 585
 586    v->calculate_cfg();
 587    bblock_t *block0 = v->cfg->blocks[0];
 588
 589    EXPECT_EQ(0, block0->start_ip);
 590    EXPECT_EQ(2, block0->end_ip);
 591
 592    EXPECT_FALSE(saturate_propagation(v));
 593    EXPECT_EQ(0, block0->start_ip);
 594    EXPECT_EQ(2, block0->end_ip);
 595    EXPECT_EQ(BRW_OPCODE_MUL, instruction(block0, 0)->opcode);
 596    EXPECT_FALSE(instruction(block0, 0)->saturate);
 597    EXPECT_FALSE(instruction(block0, 0)->src[1].negate);
 598    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 1)->opcode);
 599    EXPECT_TRUE(instruction(block0, 1)->saturate);
 600    EXPECT_TRUE(instruction(block0, 1)->src[0].negate);
 601    EXPECT_EQ(BRW_OPCODE_MOV, instruction(block0, 2)->opcode);
 602    EXPECT_TRUE(instruction(block0, 2)->saturate);
 603 }