| // Copyright 2021 The Tint Authors. |
| // |
| // Licensed under the Apache License, Version 2.0(the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| #include "src/tint/constant/value.h" |
| |
| #include "src/tint/constant/splat.h" |
| #include "src/tint/switch.h" |
| #include "src/tint/type/array.h" |
| #include "src/tint/type/matrix.h" |
| #include "src/tint/type/struct.h" |
| #include "src/tint/type/vector.h" |
| |
| TINT_INSTANTIATE_TYPEINFO(tint::constant::Value); |
| |
| namespace tint::constant { |
| |
| Value::Value() = default; |
| |
| Value::~Value() = default; |
| |
| /// Equal returns true if the constants `a` and `b` are of the same type and value. |
| bool Value::Equal(const constant::Value* b) const { |
| if (this == b) { |
| return true; |
| } |
| if (Hash() != b->Hash()) { |
| return false; |
| } |
| if (Type() != b->Type()) { |
| return false; |
| } |
| |
| auto elements_equal = [&](size_t count) { |
| if (count == 0) { |
| return true; |
| } |
| |
| // Avoid per-element comparisons if the constants are splats |
| bool a_is_splat = Is<Splat>(); |
| bool b_is_splat = b->Is<Splat>(); |
| if (a_is_splat && b_is_splat) { |
| return Index(0)->Equal(b->Index(0)); |
| } |
| |
| if (a_is_splat) { |
| auto* el_a = Index(0); |
| for (size_t i = 0; i < count; i++) { |
| if (!el_a->Equal(b->Index(i))) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| if (b_is_splat) { |
| auto* el_b = b->Index(0); |
| for (size_t i = 0; i < count; i++) { |
| if (!Index(i)->Equal(el_b)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| // Per-element comparison |
| for (size_t i = 0; i < count; i++) { |
| if (!Index(i)->Equal(b->Index(i))) { |
| return false; |
| } |
| } |
| return true; |
| }; |
| |
| return Switch( |
| Type(), // |
| [&](const type::Vector* vec) { return elements_equal(vec->Width()); }, |
| [&](const type::Matrix* mat) { return elements_equal(mat->columns()); }, |
| [&](const type::Struct* str) { return elements_equal(str->Members().Length()); }, |
| [&](const type::Array* arr) { |
| if (auto n = arr->ConstantCount()) { |
| return elements_equal(*n); |
| } |
| return false; |
| }, |
| [&](Default) { |
| auto va = InternalValue(); |
| auto vb = b->InternalValue(); |
| TINT_ASSERT(Resolver, !std::holds_alternative<std::monostate>(va)); |
| TINT_ASSERT(Resolver, !std::holds_alternative<std::monostate>(vb)); |
| return va == vb; |
| }); |
| } |
| |
| } // namespace tint::constant |