Stephen Adams e962350dd6 [dart2js] Simply is-test when type parameters not needed ...

Sometimes the type expression of a is-test can be widened to one that
does not use type variables:

```dart
void addAll(Iterable<E> items) {
  if (items is List<E>) {
    ... items[i] ...  // code specialized to lists
  }
  ...
}
```

Changing `is List<E>` to `is List` is more efficient, but not possible
at the source level since the explicit type parameter is needed for
type promotion.

This change uses a predicate provided by the Kernel package to widen
an interface type when generating the CFG instructions for the
is-test. This can lead to knock-on optimizations like compiling `is X`
to `instanceof`.



Bug: #54998
Change-Id: I956b9d9b8a31ae40aee86e31def475baa9ab5cfe
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/408124
Reviewed-by: Nate Biggs <natebiggs@google.com>
Commit-Queue: Stephen Adams <sra@google.com>

2025-02-06 16:54:50 -08:00

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data

[dart2js] Simply is-test when type parameters not needed

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model_data

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arithmetic_simplification_test.dart

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array_static_intercept_test.dart

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bitops1_test.dart

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bitops2_test.dart

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builtin_interceptor_test.dart

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class_codegen2_test.dart

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class_codegen_test.dart

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class_order_test.dart

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closure_call_of_static_reduction_test.dart

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closure_codegen_test.dart

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code_motion_test.dart

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codegen_shard0_test.dart

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codegen_shard1_test.dart

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codegen_test_helper.dart

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constant_folding_codeUnitAt_test.dart

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constant_folding_test.dart

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constant_namer_test.dart

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dead_code_test.dart

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dead_phi_eliminator_test.dart

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declare_once_test.dart

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elide_callthrough_stub_test.dart

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emit_const_fields_test.dart

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equals_test.dart

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expect_annotations2_test.dart

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expect_annotations_test.dart

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field_codegen_test.dart

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field_update_test.dart

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for_in_test.dart

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forloop_box_test.dart

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generate_at_use_site_test.dart

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generic_method_test.dart

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gvn_test.dart

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identity_test.dart

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if_do_while_test.dart

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interceptor_almost_constant_test.dart

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interceptor_test.dart

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interpolation_folding_test.dart

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inverse_operator_test.dart

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is_function_test.dart

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is_inference2_test.dart

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is_inference_test.dart

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jsarray_indexof_test.dart

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late_field_redundancy_test.dart

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late_field_test.dart

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licm_test.dart

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list_tracer_length_test.dart

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list_tracer_node_type_test.dart

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literal_list_test.dart

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literal_map_test.dart

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load_elimination_test.dart

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loop_test.dart

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minify_many_locals_test.dart

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model_test.dart

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modulo_remainder_test.dart

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negation_shift_regression_test.dart

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new_rti_is_test.dart

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no_constructor_body_test.dart

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no_duplicate_constructor_body2_test.dart

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no_duplicate_constructor_body_test.dart

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no_duplicate_stub_test.dart

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null_check_test.dart

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null_type_test.dart

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number_output_test.dart

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parameter_phi_elimination_test.dart

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pragma_annotations_test.dart

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pretty_parameter_test.dart

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redundant_phi_eliminator_test.dart

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regress_10231_test.dart

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shift_right_unsigned_test.dart

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side_effect_tdiv_regression_test.dart

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simple_inferrer_relations_test.dart

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ssa_phi_codegen_test.dart

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static_closure_test.dart

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strength_eq_test.dart

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string_abbreviation_test.dart

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string_add_test.dart

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string_escapes_test.dart

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string_interpolation_test.dart

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string_reference_test.dart

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switch_empty_default_test.dart

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tdiv_test.dart

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top_level_closure_tree_shake_test.dart

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tree_shaking_test.dart

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trust_type_annotations2_test.dart

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trust_type_annotations_test.dart

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type_guard_unuser_test.dart

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type_inference2_test.dart

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type_inference3_test.dart

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type_inference4_test.dart

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type_inference5_test.dart

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type_inference8_test.dart

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types_of_captured_variables_test.dart

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unused_empty_map_test.dart

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use_checks_test.dart

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use_strict_test.dart

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value_range2_test.dart

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value_range3_test.dart

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value_range_test.dart

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variance_subtype_cast_test.dart

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