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Expose int4 c++ type to "include" folder for use in external projects.
This involves separating the C++ definition from the numpy type information to avoid the numpy dependency. Also renamed `_custom_floats` to `_ml_dtypes_lib` for the compiled shared library, since it includes more than just floating-point types. We will use it in XLA and TensorFlow. PiperOrigin-RevId: 561775184
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,99 @@ | ||
| /* Copyright 2023 The ml_dtypes 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. | ||
| ==============================================================================*/ | ||
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| #ifndef ML_DTYPES_INT4_H_ | ||
| #define ML_DTYPES_INT4_H_ | ||
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| #include <cstdint> | ||
| #include <optional> | ||
| #include <ostream> | ||
| #include <sstream> | ||
| #include <string> | ||
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| namespace ml_dtypes { | ||
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| template <typename UnderlyingTy> | ||
| struct i4 { | ||
| private: | ||
| UnderlyingTy v : 4; | ||
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| public: | ||
| i4() : v(0) {} | ||
| explicit i4(UnderlyingTy val) : v(val & 0x0F) {} | ||
| template <typename T> | ||
| explicit i4(T t) : i4(static_cast<UnderlyingTy>(t)) {} | ||
| i4(const i4& other) = default; | ||
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| static constexpr i4 lowest() { | ||
| return std::is_signed<UnderlyingTy>::value ? i4(-8) : i4(0); | ||
| } | ||
| static constexpr i4 highest() { | ||
| return std::is_signed<UnderlyingTy>::value ? i4(7) : i4(15); | ||
| } | ||
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| template <typename T, typename = std::enable_if_t<std::is_arithmetic_v<T>>> | ||
| explicit operator T() const { | ||
| return static_cast<T>(v); | ||
| } | ||
| // NOLINTNEXTLINE(google-explicit-constructor) | ||
| operator std::optional<int64_t>() const { return static_cast<int64_t>(v); } | ||
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| i4 operator-() const { return i4(-v); } | ||
| i4 operator+(const i4& other) const { return i4((v + other.v)); } | ||
| i4 operator-(const i4& other) const { return i4((v - other.v)); } | ||
| i4 operator*(const i4& other) const { return i4((v * other.v)); } | ||
| i4 operator/(const i4& other) const { return i4((v / other.v)); } | ||
| i4 operator%(const i4& other) const { return i4((v % other.v)); } | ||
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| i4 operator>>(const int amount) const { return i4((v >> amount)); } | ||
| i4 operator<<(const int amount) const { return i4((v << amount)); } | ||
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| bool operator==(const i4& other) const { return v == other.v; } | ||
| bool operator!=(const i4& other) const { return v != other.v; } | ||
| bool operator<(const i4& other) const { return v < other.v; } | ||
| bool operator>(const i4& other) const { return v > other.v; } | ||
| bool operator<=(const i4& other) const { return v <= other.v; } | ||
| bool operator>=(const i4& other) const { return v >= other.v; } | ||
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| bool operator==(const int64_t other) const { return v == other; } | ||
| bool operator!=(const int64_t other) const { return v != other; } | ||
| bool operator<(const int64_t other) const { return v < other; } | ||
| bool operator>(const int64_t other) const { return v > other; } | ||
| bool operator<=(const int64_t other) const { return v <= other; } | ||
| bool operator>=(const int64_t other) const { return v >= other; } | ||
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| i4& operator++() { | ||
| v = (v + 1) & 0x0F; | ||
| return *this; | ||
| } | ||
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| friend ::std::ostream& operator<<(::std::ostream& os, const i4& num) { | ||
| os << static_cast<int16_t>(num.v); | ||
| return os; | ||
| } | ||
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| std::string ToString() const { | ||
| std::ostringstream os; | ||
| os << static_cast<int16_t>(v); | ||
| return os.str(); | ||
| } | ||
| }; | ||
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| using int4 = i4<int8_t>; | ||
| using uint4 = i4<uint8_t>; | ||
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| } // namespace ml_dtypes | ||
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| #endif // ML_DTYPES_INT4_H_ |
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