src/compiler/nir/tests/control_flow_tests.cpp

   1 /*
   2  * Copyright © 2015 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
  21  * DEALINGS IN THE SOFTWARE.
  22  */
  23 #include <gtest/gtest.h>
  24 #include "nir.h"
  25 #include "nir_builder.h"
  26
  27 class nir_cf_test : public ::testing::Test {
  28 protected:
  29    nir_cf_test();
  30    ~nir_cf_test();
  31
  32    nir_builder b;
  33 };
  34
  35 nir_cf_test::nir_cf_test()
  36 {
  37    glsl_type_singleton_init_or_ref();
  38
  39    static const nir_shader_compiler_options options = { };
  40    nir_builder_init_simple_shader(&b, NULL, MESA_SHADER_VERTEX, &options);
  41 }
  42
  43 nir_cf_test::~nir_cf_test()
  44 {
  45    ralloc_free(b.shader);
  46    glsl_type_singleton_decref();
  47 }
  48
  49 TEST_F(nir_cf_test, delete_break_in_loop)
  50 {
  51    /* Create IR:
  52     *
  53     * while (...) { break; }
  54     */
  55    nir_loop *loop = nir_loop_create(b.shader);
  56    nir_cf_node_insert(nir_after_cf_list(&b.impl->body), &loop->cf_node);
  57
  58    b.cursor = nir_after_cf_list(&loop->body);
  59
  60    nir_jump_instr *jump = nir_jump_instr_create(b.shader, nir_jump_break);
  61    nir_builder_instr_insert(&b, &jump->instr);
  62
  63    /* At this point, we should have:
  64     *
  65     * impl main {
  66     *         block block_0:
  67     *         // preds:
  68     *         // succs: block_1
  69     *         loop {
  70     *                 block block_1:
  71     *                 // preds: block_0
  72     *                 break
  73     *                 // succs: block_2
  74     *         }
  75     *         block block_2:
  76     *         // preds: block_1
  77     *         // succs: block_3
  78     *         block block_3:
  79     * }
  80     */
  81    nir_block *block_0 = nir_start_block(b.impl);
  82    nir_block *block_1 = nir_loop_first_block(loop);
  83    nir_block *block_2 = nir_cf_node_as_block(nir_cf_node_next(&loop->cf_node));
  84    nir_block *block_3 = b.impl->end_block;
  85    ASSERT_EQ(nir_cf_node_block, block_0->cf_node.type);
  86    ASSERT_EQ(nir_cf_node_block, block_1->cf_node.type);
  87    ASSERT_EQ(nir_cf_node_block, block_2->cf_node.type);
  88    ASSERT_EQ(nir_cf_node_block, block_3->cf_node.type);
  89
  90    /* Verify the successors and predecessors. */
  91    EXPECT_EQ(block_1, block_0->successors[0]);
  92    EXPECT_EQ(NULL,    block_0->successors[1]);
  93    EXPECT_EQ(block_2, block_1->successors[0]);
  94    EXPECT_EQ(NULL,    block_1->successors[1]);
  95    EXPECT_EQ(block_3, block_2->successors[0]);
  96    EXPECT_EQ(NULL,    block_2->successors[1]);
  97    EXPECT_EQ(NULL,    block_3->successors[0]);
  98    EXPECT_EQ(NULL,    block_3->successors[1]);
  99    EXPECT_EQ(0,       block_0->predecessors->entries);
 100    EXPECT_EQ(1,       block_1->predecessors->entries);
 101    EXPECT_EQ(1,       block_2->predecessors->entries);
 102    EXPECT_EQ(1,       block_3->predecessors->entries);
 103    EXPECT_TRUE(_mesa_set_search(block_1->predecessors, block_0));
 104    EXPECT_TRUE(_mesa_set_search(block_2->predecessors, block_1));
 105    EXPECT_TRUE(_mesa_set_search(block_3->predecessors, block_2));
 106
 107    nir_print_shader(b.shader, stderr);
 108
 109    /* Now remove the break. */
 110    nir_instr_remove(&jump->instr);
 111
 112    nir_print_shader(b.shader, stderr);
 113
 114    /* At this point, we should have:
 115     *
 116     * impl main {
 117     *         block block_0:
 118     *         // preds:
 119     *         // succs: block_1
 120     *         loop {
 121     *                 block block_1:
 122     *                 // preds: block_0 block_1
 123     *                 // succs: block_1
 124     *         }
 125     *         block block_2:
 126     *         // preds:
 127     *         // succs: block_3
 128     *         block block_3:
 129     * }
 130     *
 131     * Re-verify the predecessors and successors.
 132     */
 133    EXPECT_EQ(block_1, block_0->successors[0]);
 134    EXPECT_EQ(NULL,    block_0->successors[1]);
 135    EXPECT_EQ(block_1, block_1->successors[0]); /* back to itself */
 136    EXPECT_EQ(NULL,    block_1->successors[1]);
 137    EXPECT_EQ(block_3, block_2->successors[0]);
 138    EXPECT_EQ(NULL,    block_2->successors[1]);
 139    EXPECT_EQ(NULL,    block_3->successors[0]);
 140    EXPECT_EQ(NULL,    block_3->successors[1]);
 141    EXPECT_EQ(0,       block_0->predecessors->entries);
 142    EXPECT_EQ(2,       block_1->predecessors->entries);
 143    EXPECT_EQ(0,       block_2->predecessors->entries);
 144    EXPECT_EQ(1,       block_3->predecessors->entries);
 145    EXPECT_TRUE(_mesa_set_search(block_1->predecessors, block_0));
 146    EXPECT_TRUE(_mesa_set_search(block_1->predecessors, block_1));
 147    EXPECT_FALSE(_mesa_set_search(block_2->predecessors, block_1));
 148    EXPECT_TRUE(_mesa_set_search(block_3->predecessors, block_2));
 149
 150    nir_metadata_require(b.impl, nir_metadata_dominance);
 151 }