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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:
copy_propagation_fs_visitor(struct brw_compiler * compiler,struct brw_wm_prog_data * prog_data,nir_shader * shader)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 
SetUp()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 *
instruction(bblock_t * block,int num)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
copy_propagation(fs_visitor * v)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 
TEST_F(copy_propagation_test,basic)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 
TEST_F(copy_propagation_test,maxmax_sat_imm)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 }
213