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nir: Add test to check edge case in Split ALU optimization 

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11476>
This commit is contained in:
Caio Marcelo de Oliveira Filho 2021-06-23 15:28:40 -07:00 committed by Marge Bot
parent b951929795
commit 3a9289eaed
1 changed files with 49 additions and 0 deletions
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49
src/compiler/nir/tests/opt_if_tests.cpp
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@ -141,3 +141,52 @@ TEST_F(nir_opt_if_test, opt_if_simplification_single_source_phi_after_if)
ASSERT_TRUE(nir_block_ends_in_jump(nir_if_last_then_block(nif)));
ASSERT_TRUE(exec_list_is_empty((&nir_if_first_else_block(nif)->instr_list)));
}
TEST_F(nir_opt_if_test, opt_if_alu_of_phi_progress)
{
nir_ssa_def *two = nir_imm_int(&bld, 2);
nir_ssa_def *x = nir_imm_int(&bld, 0);
nir_phi_instr *phi = nir_phi_instr_create(bld.shader);
nir_loop *loop = nir_push_loop(&bld);
{
nir_ssa_dest_init(&phi->instr, &phi->dest,
x->num_components, x->bit_size, NULL);
nir_phi_src *phi_src_x = ralloc(phi, nir_phi_src);
phi_src_x->pred = x->parent_instr->block;
phi_src_x->src = nir_src_for_ssa(x);
exec_list_push_tail(&phi->srcs, &phi_src_x->node);
nir_ssa_def *y = nir_iadd(&bld, &phi->dest.ssa, two);
nir_store_var(&bld, out_var,
nir_imul(&bld, &phi->dest.ssa, two), 1);
nir_phi_src *phi_src_y = ralloc(phi, nir_phi_src);
phi_src_y->pred = nir_cursor_current_block(bld.cursor);
phi_src_y->src = nir_src_for_ssa(y);
exec_list_push_tail(&phi->srcs, &phi_src_y->node);
}
nir_pop_loop(&bld, loop);
bld.cursor = nir_before_block(nir_loop_first_block(loop));
nir_builder_instr_insert(&bld, &phi->instr);
nir_validate_shader(bld.shader, "input");
bool progress;
int progress_count = 0;
for (int i = 0; i < 10; i++) {
progress = nir_opt_if(bld.shader, false);
if (progress)
progress_count++;
else
break;
nir_opt_constant_folding(bld.shader);
}
EXPECT_LE(progress_count, 2);
ASSERT_FALSE(progress);
}