src/mesa/drivers/dri/i965/test_vec4_copy_propagation.cpp

   1 /*
   2  * Copyright © 2014 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_vec4.h"
  26 #include "brw_vs.h"
  27 #include "program/program.h"
  28
  29 using namespace brw;
  30
  31 int ret = 0;
  32
  33 class copy_propagation_test : public ::testing::Test {
  34    virtual void SetUp();
  35
  36 public:
  37    struct brw_compiler *compiler;
  38    struct brw_device_info *devinfo;
  39    struct gl_context *ctx;
  40    struct gl_shader_program *shader_prog;
  41    struct brw_vertex_program *vp;
  42    vec4_visitor *v;
  43 };
  44
  45 class copy_propagation_vec4_visitor : public vec4_visitor
  46 {
  47 public:
  48    copy_propagation_vec4_visitor(struct brw_compiler *compiler,
  49                                  nir_shader *shader)
  50       : vec4_visitor(compiler, NULL, NULL, NULL, shader, NULL,
  51                      false /* no_spills */, -1)
  52    {
  53    }
  54
  55 protected:
  56    virtual dst_reg *make_reg_for_system_value(int location,
  57                                               const glsl_type *type)
  58    {
  59       unreachable("Not reached");
  60    }
  61
  62    virtual void setup_payload()
  63    {
  64       unreachable("Not reached");
  65    }
  66
  67    virtual void emit_prolog()
  68    {
  69       unreachable("Not reached");
  70    }
  71
  72    virtual void emit_thread_end()
  73    {
  74       unreachable("Not reached");
  75    }
  76
  77    virtual void emit_urb_write_header(int mrf)
  78    {
  79       unreachable("Not reached");
  80    }
  81
  82    virtual vec4_instruction *emit_urb_write_opcode(bool complete)
  83    {
  84       unreachable("Not reached");
  85    }
  86 };
  87
  88
  89 void copy_propagation_test::SetUp()
  90 {
  91    ctx = (struct gl_context *)calloc(1, sizeof(*ctx));
  92    compiler = (struct brw_compiler *)calloc(1, sizeof(*compiler));
  93    devinfo = (struct brw_device_info *)calloc(1, sizeof(*devinfo));
  94    compiler->devinfo = devinfo;
  95
  96    vp = ralloc(NULL, struct brw_vertex_program);
  97
  98    nir_shader *shader = nir_shader_create(NULL, MESA_SHADER_VERTEX, NULL);
  99
 100    v = new copy_propagation_vec4_visitor(compiler, shader);
 101
 102    _mesa_init_gl_program(&vp->program.Base, GL_VERTEX_SHADER, 0);
 103
 104    devinfo->gen = 4;
 105 }
 106
 107 static void
 108 copy_propagation(vec4_visitor *v)
 109 {
 110    bool print = false;
 111
 112    if (print) {
 113       fprintf(stderr, "instructions before:\n");
 114       v->dump_instructions();
 115    }
 116
 117    v->calculate_cfg();
 118    v->opt_copy_propagation();
 119
 120    if (print) {
 121       fprintf(stderr, "instructions after:\n");
 122       v->dump_instructions();
 123    }
 124 }
 125
 126 TEST_F(copy_propagation_test, test_swizzle_swizzle)
 127 {
 128    dst_reg a = dst_reg(v, glsl_type::vec4_type);
 129    dst_reg b = dst_reg(v, glsl_type::vec4_type);
 130    dst_reg c = dst_reg(v, glsl_type::vec4_type);
 131
 132    v->emit(v->ADD(a, src_reg(a), src_reg(a)));
 133
 134    v->emit(v->MOV(b, swizzle(src_reg(a), BRW_SWIZZLE4(SWIZZLE_Y,
 135                                                       SWIZZLE_Z,
 136                                                       SWIZZLE_W,
 137                                                       SWIZZLE_X))));
 138
 139    vec4_instruction *test_mov =
 140       v->MOV(c, swizzle(src_reg(b), BRW_SWIZZLE4(SWIZZLE_Y,
 141                                                  SWIZZLE_Z,
 142                                                  SWIZZLE_W,
 143                                                  SWIZZLE_X)));
 144    v->emit(test_mov);
 145
 146    copy_propagation(v);
 147
 148    EXPECT_EQ(test_mov->src[0].nr, a.nr);
 149    EXPECT_EQ(test_mov->src[0].swizzle, BRW_SWIZZLE4(SWIZZLE_Z,
 150                                                     SWIZZLE_W,
 151                                                     SWIZZLE_X,
 152                                                     SWIZZLE_Y));
 153 }
 154
 155 TEST_F(copy_propagation_test, test_swizzle_writemask)
 156 {
 157    dst_reg a = dst_reg(v, glsl_type::vec4_type);
 158    dst_reg b = dst_reg(v, glsl_type::vec4_type);
 159    dst_reg c = dst_reg(v, glsl_type::vec4_type);
 160
 161    v->emit(v->MOV(b, swizzle(src_reg(a), BRW_SWIZZLE4(SWIZZLE_X,
 162                                                       SWIZZLE_Y,
 163                                                       SWIZZLE_X,
 164                                                       SWIZZLE_Z))));
 165
 166    v->emit(v->MOV(writemask(a, WRITEMASK_XYZ), brw_imm_f(1.0f)));
 167
 168    vec4_instruction *test_mov =
 169       v->MOV(c, swizzle(src_reg(b), BRW_SWIZZLE4(SWIZZLE_W,
 170                                                  SWIZZLE_W,
 171                                                  SWIZZLE_W,
 172                                                  SWIZZLE_W)));
 173    v->emit(test_mov);
 174
 175    copy_propagation(v);
 176
 177    /* should not copy propagate */
 178    EXPECT_EQ(test_mov->src[0].nr, b.nr);
 179    EXPECT_EQ(test_mov->src[0].swizzle, BRW_SWIZZLE4(SWIZZLE_W,
 180                                                     SWIZZLE_W,
 181                                                     SWIZZLE_W,
 182                                                     SWIZZLE_W));
 183 }