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, (struct gl_program *) NULL,
  51                    shader, 8, -1) {}
  52 };
  53
  54
  55 void copy_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 copy_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 copy_propagation(fs_visitor *v)
  83 {
  84    const bool print = getenv("TEST_DEBUG");
  85
  86    if (print) {
  87       fprintf(stderr, "= Before =\n");
  88       v->cfg->dump(v);
  89    }
  90
  91    bool ret = v->opt_copy_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(copy_propagation_test, basic)
 102 {
 103    const fs_builder &bld = v->bld;
 104    fs_reg vgrf0 = v->vgrf(glsl_type::float_type);
 105    fs_reg vgrf1 = v->vgrf(glsl_type::float_type);
 106    fs_reg vgrf2 = v->vgrf(glsl_type::float_type);
 107    fs_reg vgrf3 = v->vgrf(glsl_type::float_type);
 108    bld.MOV(vgrf0, vgrf2);
 109    bld.ADD(vgrf1, vgrf0, vgrf3);
 110
 111    /* = Before =
 112     *
 113     * 0: mov(8)        vgrf0  vgrf2
 114     * 1: add(8)        vgrf1  vgrf0  vgrf3
 115     *
 116     * = After =
 117     * 0: mov(8)        vgrf0  vgrf2
 118     * 1: add(8)        vgrf1  vgrf2  vgrf3
 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(copy_propagation(v));
 128    EXPECT_EQ(0, block0->start_ip);
 129    EXPECT_EQ(1, block0->end_ip);
 130
 131    fs_inst *mov = instruction(block0, 0);
 132    EXPECT_EQ(BRW_OPCODE_MOV, mov->opcode);
 133    EXPECT_TRUE(mov->dst.equals(vgrf0));
 134    EXPECT_TRUE(mov->src[0].equals(vgrf2));
 135
 136    fs_inst *add = instruction(block0, 1);
 137    EXPECT_EQ(BRW_OPCODE_ADD, add->opcode);
 138    EXPECT_TRUE(add->dst.equals(vgrf1));
 139    EXPECT_TRUE(add->src[0].equals(vgrf2));
 140    EXPECT_TRUE(add->src[1].equals(vgrf3));
 141 }
 142
 143 TEST_F(copy_propagation_test, maxmax_sat_imm)
 144 {
 145    const fs_builder &bld = v->bld;
 146    fs_reg vgrf0 = v->vgrf(glsl_type::float_type);
 147    fs_reg vgrf1 = v->vgrf(glsl_type::float_type);
 148    fs_reg vgrf2 = v->vgrf(glsl_type::float_type);
 149
 150    static const struct {
 151       enum brw_conditional_mod conditional_mod;
 152       float immediate;
 153       bool expected_result;
 154    } test[] = {
 155       /*   conditional mod,     imm, expected_result */
 156       { BRW_CONDITIONAL_GE  ,  0.1f, true },
 157       { BRW_CONDITIONAL_L   ,  0.1f, true },
 158       { BRW_CONDITIONAL_GE  ,  0.5f, true },
 159       { BRW_CONDITIONAL_L   ,  0.5f, true },
 160       { BRW_CONDITIONAL_GE  ,  0.9f, true },
 161       { BRW_CONDITIONAL_L   ,  0.9f, true },
 162       { BRW_CONDITIONAL_GE  , -1.5f, false },
 163       { BRW_CONDITIONAL_L   , -1.5f, false },
 164       { BRW_CONDITIONAL_GE  ,  1.5f, false },
 165       { BRW_CONDITIONAL_L   ,  1.5f, false },
 166
 167       { BRW_CONDITIONAL_NONE, 0.5f, false },
 168       { BRW_CONDITIONAL_Z   , 0.5f, false },
 169       { BRW_CONDITIONAL_NZ  , 0.5f, false },
 170       { BRW_CONDITIONAL_G   , 0.5f, false },
 171       { BRW_CONDITIONAL_LE  , 0.5f, false },
 172       { BRW_CONDITIONAL_R   , 0.5f, false },
 173       { BRW_CONDITIONAL_O   , 0.5f, false },
 174       { BRW_CONDITIONAL_U   , 0.5f, false },
 175    };
 176
 177    for (unsigned i = 0; i < sizeof(test) / sizeof(test[0]); i++) {
 178       fs_inst *mov = set_saturate(true, bld.MOV(vgrf0, vgrf1));
 179       fs_inst *sel = set_condmod(test[i].conditional_mod,
 180                                  bld.SEL(vgrf2, vgrf0,
 181                                          brw_imm_f(test[i].immediate)));
 182
 183       v->calculate_cfg();
 184
 185       bblock_t *block0 = v->cfg->blocks[0];
 186
 187       EXPECT_EQ(0, block0->start_ip);
 188       EXPECT_EQ(1, block0->end_ip);
 189
 190       EXPECT_EQ(test[i].expected_result, copy_propagation(v));
 191       EXPECT_EQ(0, block0->start_ip);
 192       EXPECT_EQ(1, block0->end_ip);
 193
 194       EXPECT_EQ(BRW_OPCODE_MOV, mov->opcode);
 195       EXPECT_TRUE(mov->saturate);
 196       EXPECT_TRUE(mov->dst.equals(vgrf0));
 197       EXPECT_TRUE(mov->src[0].equals(vgrf1));
 198
 199       EXPECT_EQ(BRW_OPCODE_SEL, sel->opcode);
 200       EXPECT_EQ(test[i].conditional_mod, sel->conditional_mod);
 201       EXPECT_EQ(test[i].expected_result, sel->saturate);
 202       EXPECT_TRUE(sel->dst.equals(vgrf2));
 203       if (test[i].expected_result) {
 204          EXPECT_TRUE(sel->src[0].equals(vgrf1));
 205       } else {
 206          EXPECT_TRUE(sel->src[0].equals(vgrf0));
 207       }
 208       EXPECT_TRUE(sel->src[1].equals(brw_imm_f(test[i].immediate)));
 209
 210       delete v->cfg;
 211       v->cfg = NULL;
 212    }
 213 }