src/intel/compiler/test_fs_copy_propagation.cpp

   1 /*
   2  * Copyright © 2016 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 copy_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 copy_propagation_fs_visitor : public fs_visitor
  44 {
  45 public:
  46    copy_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, shader, 8, -1) {}
  51 };
  52
  53
  54 void copy_propagation_test::SetUp()
  55 {
  56    ctx = (struct gl_context *)calloc(1, sizeof(*ctx));
  57    compiler = (struct brw_compiler *)calloc(1, sizeof(*compiler));
  58    devinfo = (struct gen_device_info *)calloc(1, sizeof(*devinfo));
  59    compiler->devinfo = devinfo;
  60
  61    prog_data = ralloc(NULL, struct brw_wm_prog_data);
  62    nir_shader *shader =
  63       nir_shader_create(NULL, MESA_SHADER_FRAGMENT, NULL, NULL);
  64
  65    v = new copy_propagation_fs_visitor(compiler, prog_data, shader);
  66
  67    devinfo->gen = 4;
  68 }
  69
  70 static fs_inst *
  71 instruction(bblock_t *block, int num)
  72 {
  73    fs_inst *inst = (fs_inst *)block->start();
  74    for (int i = 0; i < num; i++) {
  75       inst = (fs_inst *)inst->next;
  76    }
  77    return inst;
  78 }
  79
  80 static bool
  81 copy_propagation(fs_visitor *v)
  82 {
  83    const bool print = getenv("TEST_DEBUG");
  84
  85    if (print) {
  86       fprintf(stderr, "= Before =\n");
  87       v->cfg->dump();
  88    }
  89
  90    bool ret = v->opt_copy_propagation();
  91
  92    if (print) {
  93       fprintf(stderr, "\n= After =\n");
  94       v->cfg->dump();
  95    }
  96
  97    return ret;
  98 }
  99
 100 TEST_F(copy_propagation_test, basic)
 101 {
 102    const fs_builder &bld = v->bld;
 103    fs_reg vgrf0 = v->vgrf(glsl_type::float_type);
 104    fs_reg vgrf1 = v->vgrf(glsl_type::float_type);
 105    fs_reg vgrf2 = v->vgrf(glsl_type::float_type);
 106    fs_reg vgrf3 = v->vgrf(glsl_type::float_type);
 107    bld.MOV(vgrf0, vgrf2);
 108    bld.ADD(vgrf1, vgrf0, vgrf3);
 109
 110    /* = Before =
 111     *
 112     * 0: mov(8)        vgrf0  vgrf2
 113     * 1: add(8)        vgrf1  vgrf0  vgrf3
 114     *
 115     * = After =
 116     * 0: mov(8)        vgrf0  vgrf2
 117     * 1: add(8)        vgrf1  vgrf2  vgrf3
 118     */
 119
 120    v->calculate_cfg();
 121    bblock_t *block0 = v->cfg->blocks[0];
 122
 123    EXPECT_EQ(0, block0->start_ip);
 124    EXPECT_EQ(1, block0->end_ip);
 125
 126    EXPECT_TRUE(copy_propagation(v));
 127    EXPECT_EQ(0, block0->start_ip);
 128    EXPECT_EQ(1, block0->end_ip);
 129
 130    fs_inst *mov = instruction(block0, 0);
 131    EXPECT_EQ(BRW_OPCODE_MOV, mov->opcode);
 132    EXPECT_TRUE(mov->dst.equals(vgrf0));
 133    EXPECT_TRUE(mov->src[0].equals(vgrf2));
 134
 135    fs_inst *add = instruction(block0, 1);
 136    EXPECT_EQ(BRW_OPCODE_ADD, add->opcode);
 137    EXPECT_TRUE(add->dst.equals(vgrf1));
 138    EXPECT_TRUE(add->src[0].equals(vgrf2));
 139    EXPECT_TRUE(add->src[1].equals(vgrf3));
 140 }
 141
 142 TEST_F(copy_propagation_test, maxmax_sat_imm)
 143 {
 144    const fs_builder &bld = v->bld;
 145    fs_reg vgrf0 = v->vgrf(glsl_type::float_type);
 146    fs_reg vgrf1 = v->vgrf(glsl_type::float_type);
 147    fs_reg vgrf2 = v->vgrf(glsl_type::float_type);
 148
 149    static const struct {
 150       enum brw_conditional_mod conditional_mod;
 151       float immediate;
 152       bool expected_result;
 153    } test[] = {
 154       /*   conditional mod,     imm, expected_result */
 155       { BRW_CONDITIONAL_GE  ,  0.1f, true },
 156       { BRW_CONDITIONAL_L   ,  0.1f, true },
 157       { BRW_CONDITIONAL_GE  ,  0.5f, true },
 158       { BRW_CONDITIONAL_L   ,  0.5f, true },
 159       { BRW_CONDITIONAL_GE  ,  0.9f, true },
 160       { BRW_CONDITIONAL_L   ,  0.9f, true },
 161       { BRW_CONDITIONAL_GE  , -1.5f, false },
 162       { BRW_CONDITIONAL_L   , -1.5f, false },
 163       { BRW_CONDITIONAL_GE  ,  1.5f, false },
 164       { BRW_CONDITIONAL_L   ,  1.5f, false },
 165
 166       { BRW_CONDITIONAL_NONE, 0.5f, false },
 167       { BRW_CONDITIONAL_Z   , 0.5f, false },
 168       { BRW_CONDITIONAL_NZ  , 0.5f, false },
 169       { BRW_CONDITIONAL_G   , 0.5f, false },
 170       { BRW_CONDITIONAL_LE  , 0.5f, false },
 171       { BRW_CONDITIONAL_R   , 0.5f, false },
 172       { BRW_CONDITIONAL_O   , 0.5f, false },
 173       { BRW_CONDITIONAL_U   , 0.5f, false },
 174    };
 175
 176    for (unsigned i = 0; i < sizeof(test) / sizeof(test[0]); i++) {
 177       fs_inst *mov = set_saturate(true, bld.MOV(vgrf0, vgrf1));
 178       fs_inst *sel = set_condmod(test[i].conditional_mod,
 179                                  bld.SEL(vgrf2, vgrf0,
 180                                          brw_imm_f(test[i].immediate)));
 181
 182       v->calculate_cfg();
 183
 184       bblock_t *block0 = v->cfg->blocks[0];
 185
 186       EXPECT_EQ(0, block0->start_ip);
 187       EXPECT_EQ(1, block0->end_ip);
 188
 189       EXPECT_EQ(test[i].expected_result, copy_propagation(v));
 190       EXPECT_EQ(0, block0->start_ip);
 191       EXPECT_EQ(1, block0->end_ip);
 192
 193       EXPECT_EQ(BRW_OPCODE_MOV, mov->opcode);
 194       EXPECT_TRUE(mov->saturate);
 195       EXPECT_TRUE(mov->dst.equals(vgrf0));
 196       EXPECT_TRUE(mov->src[0].equals(vgrf1));
 197
 198       EXPECT_EQ(BRW_OPCODE_SEL, sel->opcode);
 199       EXPECT_EQ(test[i].conditional_mod, sel->conditional_mod);
 200       EXPECT_EQ(test[i].expected_result, sel->saturate);
 201       EXPECT_TRUE(sel->dst.equals(vgrf2));
 202       if (test[i].expected_result) {
 203          EXPECT_TRUE(sel->src[0].equals(vgrf1));
 204       } else {
 205          EXPECT_TRUE(sel->src[0].equals(vgrf0));
 206       }
 207       EXPECT_TRUE(sel->src[1].equals(brw_imm_f(test[i].immediate)));
 208
 209       delete v->cfg;
 210       v->cfg = NULL;
 211    }
 212 }