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