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nir/tests: add nir_opt_dead_cf_test.jump_before_constant_if

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Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Konstantin Seurer <konstantin.seurer@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/24235>
This commit is contained in:
Rhys Perry 2023-07-24 12:02:48 +01:00
parent 21f0aca948
commit a53d3ff0b3
1 changed files with 49 additions and 0 deletions
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49
src/compiler/nir/tests/dce_tests.cpp
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@ -31,6 +31,14 @@ protected:
}
};
class nir_opt_dead_cf_test : public nir_test {
protected:
nir_opt_dead_cf_test()
: nir_test::nir_test("nir_opt_dead_cf_test")
{
}
};
nir_phi_instr *create_one_source_phi(nir_shader *shader, nir_block *pred,
nir_ssa_def *def)
{
@ -88,3 +96,44 @@ TEST_F(nir_opt_dce_test, return_before_loop)
nir_validate_shader(b->shader, NULL);
}
TEST_F(nir_opt_dead_cf_test, jump_before_constant_if)
{
/*
* Test that nir_opt_dead_cf removes everything after the jump, instead of trying and failing to
* stitch b0 and b3.
*
* block b0: // preds:
* 1 %0 = load_const (false)
* return
* // succs: b4
* if %0 (false) {
* block b1: // preds:
* 32 %1 = load_const (0x00000001)
* 32 %2 = deref_var &out (shader_out int)
* @store_deref (%2, %1 (0x1)) (wrmask=x, access=0)
* // succs: b3
* } else {
* block b2: // preds: , succs: b3
* }
* block b3: // preds: b1 b2
* 32 %3 = load_const (0x00000000)
* 32 %4 = deref_var &out (shader_out int)
* @store_deref (%4, %3 (0x0)) (wrmask=x, access=0)
* // succs: b4
* block b4:
*/
nir_variable *var = nir_variable_create(b->shader, nir_var_shader_out, glsl_int_type(), "out");
nir_ssa_def *cond = nir_imm_false(b);
nir_jump(b, nir_jump_return);
nir_push_if(b, cond);
nir_store_var(b, var, nir_imm_int(b, 1), 0x1);
nir_pop_if(b, NULL);
nir_store_var(b, var, nir_imm_int(b, 0), 0x1);
ASSERT_TRUE(nir_opt_dead_cf(b->shader));
nir_validate_shader(b->shader, NULL);
}