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// 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