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/*
* Copyright © 2020 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_opt_dce_test : public ::testing::Test {
protected:
nir_opt_dce_test();
~nir_opt_dce_test();
nir_builder bld;
};
nir_opt_dce_test::nir_opt_dce_test()
{
glsl_type_singleton_init_or_ref();
static const nir_shader_compiler_options options = { };
bld = nir_builder_init_simple_shader(MESA_SHADER_VERTEX, &options, "dce test");
}
nir_opt_dce_test::~nir_opt_dce_test()
{
ralloc_free(bld.shader);
glsl_type_singleton_decref();
}
nir_phi_instr *create_one_source_phi(nir_shader *shader, nir_block *pred,
nir_ssa_def *def)
{
nir_phi_instr *phi = nir_phi_instr_create(shader);
nir_phi_instr_add_src(phi, pred, nir_src_for_ssa(def));
nir_ssa_dest_init(&phi->instr, &phi->dest, def->num_components,
def->bit_size);
return phi;
}
TEST_F(nir_opt_dce_test, return_before_loop)
{
/* Test that nir_opt_dce() works correctly with loops immediately following a jump.
* nir_opt_dce() has a fast path for loops without continues, and this test ensures that it
* looks at the actual predecessors of the header instead of just counting.
*
* block block_0:
* // preds:
* return
* // succs: block_3
* loop {
* block block_1:
* // preds: block_1
* vec1 32 ssa_1 = phi block_1: ssa_0
* vec1 32 ssa_0 = load_const (0x00000001)
* vec1 32 ssa_2 = deref_var &out (shader_out int)
* intrinsic store_deref (ssa_2, ssa_1) (1, 0)
* // succs: block_1
* }
* block block_2:
* // preds:
* // succs: block_3
* block block_3:
*
* If the fast path is taken here, ssa_0 will be incorrectly DCE'd.
*/
nir_variable *var = nir_variable_create(bld.shader, nir_var_shader_out, glsl_int_type(), "out");
nir_jump(&bld, nir_jump_return);
nir_loop *loop = nir_push_loop(&bld);
nir_ssa_def *one = nir_imm_int(&bld, 1);
nir_phi_instr *phi = create_one_source_phi(bld.shader, one->parent_instr->block, one);
nir_instr_insert_before_block(one->parent_instr->block, &phi->instr);
nir_store_var(&bld, var, &phi->dest.ssa, 0x1);
nir_pop_loop(&bld, loop);
ASSERT_FALSE(nir_opt_dce(bld.shader));
nir_validate_shader(bld.shader, NULL);
}
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