--- /dev/null
+/*
+ * Copyright © 2015 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+ * DEALINGS IN THE SOFTWARE.
+ */
+#include <gtest/gtest.h>
+#include "nir.h"
+#include "nir_builder.h"
+
+class nir_cf_test : public ::testing::Test {
+protected:
+ nir_cf_test();
+ ~nir_cf_test();
+
+ nir_builder b;
+ nir_shader *shader;
+ nir_function_impl *impl;
+};
+
+nir_cf_test::nir_cf_test()
+{
+ static const nir_shader_compiler_options options = { };
+ shader = nir_shader_create(NULL, MESA_SHADER_VERTEX, &options);
+ nir_function *func = nir_function_create(shader, "main");
+ nir_function_overload *overload = nir_function_overload_create(func);
+ impl = nir_function_impl_create(overload);
+
+ nir_builder_init(&b, impl);
+}
+
+nir_cf_test::~nir_cf_test()
+{
+ ralloc_free(shader);
+}
+
+TEST_F(nir_cf_test, delete_break_in_loop)
+{
+ /* Create IR:
+ *
+ * while (...) { break; }
+ */
+ nir_loop *loop = nir_loop_create(shader);
+ nir_cf_node_insert(nir_after_cf_list(&impl->body), &loop->cf_node);
+
+ b.cursor = nir_after_cf_list(&loop->body);
+
+ nir_jump_instr *jump = nir_jump_instr_create(shader, nir_jump_break);
+ nir_builder_instr_insert(&b, &jump->instr);
+
+ /* At this point, we should have:
+ *
+ * impl main {
+ * block block_0:
+ * // preds:
+ * // succs: block_1
+ * loop {
+ * block block_1:
+ * // preds: block_0
+ * break
+ * // succs: block_2
+ * }
+ * block block_2:
+ * // preds: block_1
+ * // succs: block_3
+ * block block_3:
+ * }
+ */
+ nir_block *block_0 = nir_start_block(impl);
+ nir_block *block_1 = nir_cf_node_as_block(nir_loop_first_cf_node(loop));
+ nir_block *block_2 = nir_cf_node_as_block(nir_cf_node_next(&loop->cf_node));
+ nir_block *block_3 = impl->end_block;
+ ASSERT_EQ(nir_cf_node_block, block_0->cf_node.type);
+ ASSERT_EQ(nir_cf_node_block, block_1->cf_node.type);
+ ASSERT_EQ(nir_cf_node_block, block_2->cf_node.type);
+ ASSERT_EQ(nir_cf_node_block, block_3->cf_node.type);
+
+ /* Verify the successors and predecessors. */
+ EXPECT_EQ(block_1, block_0->successors[0]);
+ EXPECT_EQ(NULL, block_0->successors[1]);
+ EXPECT_EQ(block_2, block_1->successors[0]);
+ EXPECT_EQ(NULL, block_1->successors[1]);
+ EXPECT_EQ(block_3, block_2->successors[0]);
+ EXPECT_EQ(NULL, block_2->successors[1]);
+ EXPECT_EQ(NULL, block_3->successors[0]);
+ EXPECT_EQ(NULL, block_3->successors[1]);
+ EXPECT_EQ(0, block_0->predecessors->entries);
+ EXPECT_EQ(1, block_1->predecessors->entries);
+ EXPECT_EQ(1, block_2->predecessors->entries);
+ EXPECT_EQ(1, block_3->predecessors->entries);
+ EXPECT_TRUE(_mesa_set_search(block_1->predecessors, block_0));
+ EXPECT_TRUE(_mesa_set_search(block_2->predecessors, block_1));
+ EXPECT_TRUE(_mesa_set_search(block_3->predecessors, block_2));
+
+ nir_print_shader(shader, stderr);
+
+ /* Now remove the break. */
+ nir_instr_remove(&jump->instr);
+
+ nir_print_shader(shader, stderr);
+
+ /* At this point, we should have:
+ *
+ * impl main {
+ * block block_0:
+ * // preds:
+ * // succs: block_1
+ * loop {
+ * block block_1:
+ * // preds: block_0 block_1
+ * // succs: block_1
+ * }
+ * block block_2:
+ * // preds: block_1
+ * // succs: block_3
+ * block block_3:
+ * }
+ *
+ * Re-verify the predecessors and successors.
+ */
+ EXPECT_EQ(block_1, block_0->successors[0]);
+ EXPECT_EQ(NULL, block_0->successors[1]);
+ EXPECT_EQ(block_1, block_1->successors[0]); /* back to itself */
+ EXPECT_EQ(block_2, block_1->successors[1]); /* fake successor */
+ EXPECT_EQ(block_3, block_2->successors[0]);
+ EXPECT_EQ(NULL, block_2->successors[1]);
+ EXPECT_EQ(NULL, block_3->successors[0]);
+ EXPECT_EQ(NULL, block_3->successors[1]);
+ EXPECT_EQ(0, block_0->predecessors->entries);
+ EXPECT_EQ(2, block_1->predecessors->entries);
+ EXPECT_EQ(1, block_2->predecessors->entries);
+ EXPECT_EQ(1, block_3->predecessors->entries);
+ EXPECT_TRUE(_mesa_set_search(block_1->predecessors, block_0));
+ EXPECT_TRUE(_mesa_set_search(block_1->predecessors, block_1));
+ EXPECT_TRUE(_mesa_set_search(block_2->predecessors, block_1));
+ EXPECT_TRUE(_mesa_set_search(block_3->predecessors, block_2));
+
+ nir_metadata_require(impl, nir_metadata_dominance);
+}
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