nir: Add tests for copy propagation of derefs
Also tests for removal of redundant loads, that we currently handle as part of the copy propagation. Note some tests involve multiple blocks and are currently DISABLED because they (expectedly) fail. v2: Add missing DISABLED prefix to "multi block" tests. (Jason) Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
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Caio Marcelo de Oliveira Filho
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4dfa7adc10
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797f01c220
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@ -131,11 +131,131 @@ nir_vars_test::find_next_intrinsic(nir_intrinsic_op intrinsic,
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}
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/* Allow grouping the tests while still sharing the helpers. */
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class nir_redundant_load_vars_test : public nir_vars_test {};
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class nir_copy_prop_vars_test : public nir_vars_test {};
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class nir_dead_write_vars_test : public nir_vars_test {};
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} // namespace
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TEST_F(nir_redundant_load_vars_test, duplicated_load)
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{
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/* Load a variable twice in the same block. One should be removed. */
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nir_variable *in = create_int(nir_var_shader_in, "in");
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nir_variable **out = create_many_int(nir_var_shader_out, "out", 2);
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nir_store_var(b, out[0], nir_load_var(b, in), 1);
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nir_store_var(b, out[1], nir_load_var(b, in), 1);
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nir_validate_shader(b->shader);
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ASSERT_EQ(count_intrinsics(nir_intrinsic_load_deref), 2);
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bool progress = nir_opt_copy_prop_vars(b->shader);
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EXPECT_TRUE(progress);
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nir_validate_shader(b->shader);
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ASSERT_EQ(count_intrinsics(nir_intrinsic_load_deref), 1);
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}
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TEST_F(nir_redundant_load_vars_test, DISABLED_duplicated_load_in_two_blocks)
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{
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/* Load a variable twice in different blocks. One should be removed. */
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nir_variable *in = create_int(nir_var_shader_in, "in");
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nir_variable **out = create_many_int(nir_var_shader_out, "out", 2);
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nir_store_var(b, out[0], nir_load_var(b, in), 1);
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/* Forces the stores to be in different blocks. */
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nir_pop_if(b, nir_push_if(b, nir_imm_int(b, 0)));
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nir_store_var(b, out[1], nir_load_var(b, in), 1);
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nir_validate_shader(b->shader);
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ASSERT_EQ(count_intrinsics(nir_intrinsic_load_deref), 2);
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bool progress = nir_opt_copy_prop_vars(b->shader);
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EXPECT_TRUE(progress);
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nir_validate_shader(b->shader);
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ASSERT_EQ(count_intrinsics(nir_intrinsic_load_deref), 1);
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}
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TEST_F(nir_redundant_load_vars_test, DISABLED_invalidate_inside_if_block)
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{
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/* Load variables, then write to some of then in different branches of the
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* if statement. They should be invalidated accordingly.
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*/
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nir_variable **g = create_many_int(nir_var_global, "g", 3);
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nir_variable **out = create_many_int(nir_var_shader_out, "out", 3);
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nir_load_var(b, g[0]);
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nir_load_var(b, g[1]);
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nir_load_var(b, g[2]);
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nir_if *if_stmt = nir_push_if(b, nir_imm_int(b, 0));
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nir_store_var(b, g[0], nir_imm_int(b, 10), 1);
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nir_push_else(b, if_stmt);
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nir_store_var(b, g[1], nir_imm_int(b, 20), 1);
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nir_pop_if(b, if_stmt);
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nir_store_var(b, out[0], nir_load_var(b, g[0]), 1);
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nir_store_var(b, out[1], nir_load_var(b, g[1]), 1);
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nir_store_var(b, out[2], nir_load_var(b, g[2]), 1);
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nir_validate_shader(b->shader);
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bool progress = nir_opt_copy_prop_vars(b->shader);
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EXPECT_TRUE(progress);
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/* There are 3 initial loads, plus 2 loads for the values invalidated
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* inside the if statement.
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*/
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ASSERT_EQ(count_intrinsics(nir_intrinsic_load_deref), 5);
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/* We only load g[2] once. */
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unsigned g2_load_count = 0;
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nir_intrinsic_instr *load = NULL;
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for (int i = 0; i < 5; i++) {
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load = find_next_intrinsic(nir_intrinsic_load_deref, load);
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if (nir_intrinsic_get_var(load, 0) == g[2])
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g2_load_count++;
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}
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EXPECT_EQ(g2_load_count, 1);
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}
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TEST_F(nir_redundant_load_vars_test, invalidate_live_load_in_the_end_of_loop)
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{
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/* Invalidating a load in the end of loop body will apply to the whole loop
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* body.
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*/
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nir_variable *v = create_int(nir_var_shader_storage, "v");
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nir_load_var(b, v);
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nir_loop *loop = nir_push_loop(b);
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nir_if *if_stmt = nir_push_if(b, nir_imm_int(b, 0));
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nir_jump(b, nir_jump_break);
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nir_pop_if(b, if_stmt);
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nir_load_var(b, v);
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nir_store_var(b, v, nir_imm_int(b, 10), 1);
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nir_pop_loop(b, loop);
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bool progress = nir_opt_copy_prop_vars(b->shader);
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ASSERT_FALSE(progress);
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}
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TEST_F(nir_copy_prop_vars_test, simple_copies)
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{
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nir_variable *in = create_int(nir_var_shader_in, "in");
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@ -190,6 +310,186 @@ TEST_F(nir_copy_prop_vars_test, simple_store_load)
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}
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}
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TEST_F(nir_copy_prop_vars_test, store_store_load)
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{
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nir_variable **v = create_many_ivec2(nir_var_local, "v", 2);
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unsigned mask = 1 | 2;
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nir_ssa_def *first_value = nir_imm_ivec2(b, 10, 20);
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nir_store_var(b, v[0], first_value, mask);
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nir_ssa_def *second_value = nir_imm_ivec2(b, 30, 40);
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nir_store_var(b, v[0], second_value, mask);
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nir_ssa_def *read_value = nir_load_var(b, v[0]);
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nir_store_var(b, v[1], read_value, mask);
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nir_validate_shader(b->shader);
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bool progress = nir_opt_copy_prop_vars(b->shader);
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EXPECT_TRUE(progress);
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nir_validate_shader(b->shader);
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/* Store to v[1] should use second_value directly. */
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nir_intrinsic_instr *store_to_v1 = NULL;
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while ((store_to_v1 = find_next_intrinsic(nir_intrinsic_store_deref, store_to_v1)) != NULL) {
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if (nir_intrinsic_get_var(store_to_v1, 0) == v[1]) {
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ASSERT_TRUE(store_to_v1->src[1].is_ssa);
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EXPECT_EQ(store_to_v1->src[1].ssa, second_value);
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break;
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}
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}
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EXPECT_TRUE(store_to_v1);
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}
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TEST_F(nir_copy_prop_vars_test, store_store_load_different_components)
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{
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nir_variable **v = create_many_ivec2(nir_var_local, "v", 2);
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nir_ssa_def *first_value = nir_imm_ivec2(b, 10, 20);
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nir_store_var(b, v[0], first_value, 1 << 1);
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nir_ssa_def *second_value = nir_imm_ivec2(b, 30, 40);
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nir_store_var(b, v[0], second_value, 1 << 0);
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nir_ssa_def *read_value = nir_load_var(b, v[0]);
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nir_store_var(b, v[1], read_value, 1 << 1);
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nir_validate_shader(b->shader);
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bool progress = nir_opt_copy_prop_vars(b->shader);
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EXPECT_TRUE(progress);
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nir_validate_shader(b->shader);
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nir_opt_constant_folding(b->shader);
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nir_validate_shader(b->shader);
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/* Store to v[1] should use first_value directly. The write of
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* second_value did not overwrite the component it uses.
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*/
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nir_intrinsic_instr *store_to_v1 = NULL;
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while ((store_to_v1 = find_next_intrinsic(nir_intrinsic_store_deref, store_to_v1)) != NULL) {
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if (nir_intrinsic_get_var(store_to_v1, 0) == v[1]) {
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ASSERT_TRUE(store_to_v1->src[1].is_ssa);
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nir_const_value *const_index = nir_src_as_const_value(store_to_v1->src[1]);
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ASSERT_TRUE(const_index);
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ASSERT_EQ(const_index->u32[1], 20);
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break;
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}
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}
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EXPECT_TRUE(store_to_v1);
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}
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TEST_F(nir_copy_prop_vars_test, DISABLED_store_store_load_different_components_in_many_blocks)
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{
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nir_variable **v = create_many_ivec2(nir_var_local, "v", 2);
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nir_ssa_def *first_value = nir_imm_ivec2(b, 10, 20);
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nir_store_var(b, v[0], first_value, 1 << 1);
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/* Adding an if statement will cause blocks to be created. */
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nir_pop_if(b, nir_push_if(b, nir_imm_int(b, 0)));
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nir_ssa_def *second_value = nir_imm_ivec2(b, 30, 40);
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nir_store_var(b, v[0], second_value, 1 << 0);
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/* Adding an if statement will cause blocks to be created. */
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nir_pop_if(b, nir_push_if(b, nir_imm_int(b, 0)));
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nir_ssa_def *read_value = nir_load_var(b, v[0]);
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nir_store_var(b, v[1], read_value, 1 << 1);
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nir_validate_shader(b->shader);
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nir_print_shader(b->shader, stdout);
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bool progress = nir_opt_copy_prop_vars(b->shader);
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EXPECT_TRUE(progress);
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nir_print_shader(b->shader, stdout);
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nir_validate_shader(b->shader);
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nir_opt_constant_folding(b->shader);
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nir_validate_shader(b->shader);
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/* Store to v[1] should use first_value directly. The write of
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* second_value did not overwrite the component it uses.
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*/
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nir_intrinsic_instr *store_to_v1 = NULL;
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while ((store_to_v1 = find_next_intrinsic(nir_intrinsic_store_deref, store_to_v1)) != NULL) {
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if (nir_intrinsic_get_var(store_to_v1, 0) == v[1]) {
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ASSERT_TRUE(store_to_v1->src[1].is_ssa);
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nir_const_value *const_index = nir_src_as_const_value(store_to_v1->src[1]);
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ASSERT_TRUE(const_index);
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ASSERT_EQ(const_index->u32[1], 20);
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break;
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}
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}
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EXPECT_TRUE(store_to_v1);
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}
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TEST_F(nir_copy_prop_vars_test, DISABLED_memory_barrier_in_two_blocks)
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{
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nir_variable **v = create_many_int(nir_var_shader_storage, "v", 4);
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nir_store_var(b, v[0], nir_imm_int(b, 1), 1);
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nir_store_var(b, v[1], nir_imm_int(b, 2), 1);
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/* Split into many blocks. */
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nir_pop_if(b, nir_push_if(b, nir_imm_int(b, 0)));
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nir_store_var(b, v[2], nir_load_var(b, v[0]), 1);
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nir_builder_instr_insert(b, &nir_intrinsic_instr_create(b->shader, nir_intrinsic_memory_barrier)->instr);
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nir_store_var(b, v[3], nir_load_var(b, v[1]), 1);
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bool progress = nir_opt_copy_prop_vars(b->shader);
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ASSERT_TRUE(progress);
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/* Only the second load will remain after the optimization. */
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ASSERT_EQ(1, count_intrinsics(nir_intrinsic_load_deref));
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nir_intrinsic_instr *load = NULL;
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load = find_next_intrinsic(nir_intrinsic_load_deref, load);
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ASSERT_EQ(nir_intrinsic_get_var(load, 0), v[1]);
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}
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TEST_F(nir_copy_prop_vars_test, DISABLED_simple_store_load_in_two_blocks)
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{
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nir_variable **v = create_many_ivec2(nir_var_local, "v", 2);
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unsigned mask = 1 | 2;
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nir_ssa_def *stored_value = nir_imm_ivec2(b, 10, 20);
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nir_store_var(b, v[0], stored_value, mask);
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/* Adding an if statement will cause blocks to be created. */
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nir_pop_if(b, nir_push_if(b, nir_imm_int(b, 0)));
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nir_ssa_def *read_value = nir_load_var(b, v[0]);
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nir_store_var(b, v[1], read_value, mask);
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nir_validate_shader(b->shader);
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bool progress = nir_opt_copy_prop_vars(b->shader);
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EXPECT_TRUE(progress);
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nir_validate_shader(b->shader);
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ASSERT_EQ(count_intrinsics(nir_intrinsic_store_deref), 2);
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nir_intrinsic_instr *store = NULL;
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for (int i = 0; i < 2; i++) {
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store = find_next_intrinsic(nir_intrinsic_store_deref, store);
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ASSERT_TRUE(store->src[1].is_ssa);
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EXPECT_EQ(store->src[1].ssa, stored_value);
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}
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}
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TEST_F(nir_dead_write_vars_test, no_dead_writes_in_block)
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{
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nir_variable **v = create_many_int(nir_var_shader_storage, "v", 2);
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