104 lines
3.3 KiB
C++
104 lines
3.3 KiB
C++
// Copyright 2022 The Tint Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SRC_TINT_CONSTANT_SCALAR_H_
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#define SRC_TINT_CONSTANT_SCALAR_H_
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#include "src/tint/constant/value.h"
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#include "src/tint/number.h"
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#include "src/tint/type/type.h"
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#include "src/tint/utils/castable.h"
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#include "src/tint/utils/hash.h"
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namespace tint::constant {
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/// Scalar holds a single scalar or abstract-numeric value.
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template <typename T>
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class Scalar : public utils::Castable<Scalar<T>, Value> {
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public:
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static_assert(!std::is_same_v<UnwrapNumber<T>, T> || std::is_same_v<T, bool>,
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"T must be a Number or bool");
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/// Constructor
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/// @param t the scalar type
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/// @param v the scalar value
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Scalar(const type::Type* t, T v) : type(t), value(v) {
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if constexpr (IsFloatingPoint<T>) {
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TINT_ASSERT(Constant, std::isfinite(v.value));
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}
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}
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~Scalar() override = default;
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/// @copydoc Value::Type()
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const type::Type* Type() const override { return type; }
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/// @return nullptr, as Scalar does not hold any elements.
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const Value* Index(size_t) const override { return nullptr; }
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/// @copydoc Value::NumElements()
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size_t NumElements() const override { return 1; }
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/// @copydoc Value::AllZero()
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bool AllZero() const override { return IsPositiveZero(); }
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/// @copydoc Value::AnyZero()
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bool AnyZero() const override { return IsPositiveZero(); }
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/// @copydoc Value::Hash()
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size_t Hash() const override { return utils::Hash(type, ValueOf()); }
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/// Clones the constant into the provided context
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/// @param ctx the clone context
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/// @returns the cloned node
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const Scalar* Clone(CloneContext& ctx) const override {
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auto* ty = type->Clone(ctx.type_ctx);
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return ctx.dst.constants->Create<Scalar<T>>(ty, value);
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}
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/// @returns `value` if `T` is not a Number, otherwise ValueOf returns the inner value of the
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/// Number.
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inline auto ValueOf() const {
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if constexpr (std::is_same_v<UnwrapNumber<T>, T>) {
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return value;
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} else {
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return value.value;
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}
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}
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/// @returns true if `value` is a positive zero.
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inline bool IsPositiveZero() const {
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using N = UnwrapNumber<T>;
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return Number<N>(value) == Number<N>(0); // Considers sign bit
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}
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/// The scalar type
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type::Type const* const type;
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/// The scalar value
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const T value;
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protected:
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/// @copydoc Value::InternalValue()
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std::variant<std::monostate, AInt, AFloat> InternalValue() const override {
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if constexpr (IsFloatingPoint<UnwrapNumber<T>>) {
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return static_cast<AFloat>(value);
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} else {
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return static_cast<AInt>(value);
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}
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}
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};
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} // namespace tint::constant
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#endif // SRC_TINT_CONSTANT_SCALAR_H_
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