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// SPDX-License-Identifier: GPL-3.0-or-later
#ifndef RCC_ADT_APFLOAT_H
#define RCC_ADT_APFLOAT_H
#include "rcc/Support/Error.h"
#include <array>
#include <cstdint>
#include <optional>
#include <span>
#include <string>
#include <string_view>
namespace rcc {
enum class FloatSemantics : std::uint8_t {
IEEEHalf,
BFloat,
IEEESingle,
IEEEDouble,
IEEEQuad,
PPCDoubleDouble,
Float8E5M2,
Float8E5M2FNUZ,
Float8E4M3,
Float8E4M3FN,
Float8E4M3FNUZ,
Float8E4M3B11FNUZ,
Float8E3M4,
FloatTF32,
Float8E8M0FNU,
Float6E3M2FN,
Float6E2M3FN,
Float4E2M1FN,
X87DoubleExtended,
Count,
};
[[nodiscard]] std::optional<std::uint32_t>
getFloatSemanticsBitWidth(FloatSemantics Semantics) noexcept;
[[nodiscard]] std::string_view getFloatSemanticsSpelling(FloatSemantics Semantics) noexcept;
class APFloat final {
public:
[[nodiscard]] static Expected<APFloat> create(FloatSemantics Semantics,
std::span<const std::uint64_t> Words);
[[nodiscard]] static Expected<APFloat> parse(FloatSemantics Semantics, std::string_view Text);
[[nodiscard]] FloatSemantics semantics() const noexcept {
return Semantics;
}
[[nodiscard]] std::uint32_t bitWidth() const noexcept {
return getFloatSemanticsBitWidth(Semantics).value_or(0);
}
[[nodiscard]] std::span<const std::uint64_t> words() const noexcept {
return std::span(Words).first(WordCount);
}
[[nodiscard]] std::string toString() const;
friend bool operator==(const APFloat &Left, const APFloat &Right) = default;
private:
APFloat(FloatSemantics Semantics, std::array<std::uint64_t, 2> Words,
std::uint8_t WordCount) noexcept
: Semantics(Semantics), Words(Words), WordCount(WordCount) {}
FloatSemantics Semantics;
std::array<std::uint64_t, 2> Words;
std::uint8_t WordCount;
};
} // namespace rcc
#endif // RCC_ADT_APFLOAT_H
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