From 2103fd9acdf58279f739860bff3f8c9f4b845605 Mon Sep 17 00:00:00 2001 From: Abseil Team Date: Mon, 18 Nov 2019 11:02:26 -0800 Subject: Export of internal Abseil changes -- d447fdcb801036cf08197eece193a5a706661120 by Gennadiy Rozental : Eliminate the need for static function holding help message. This decreases the cost of ABSL_FLAG abstraction by 120 bytes under clang. PiperOrigin-RevId: 281107806 -- 0aa6b91189f0e8b2381438c33465673a7ae02487 by Derek Mauro : Disable the weak symbol CCTZ extension in the time test_util on MinGW, which does not support it. PiperOrigin-RevId: 280719769 -- 67322c41c3e776eb541de90fa4526bdb49422eb6 by Abseil Team : Tune PeriodicSampler implementation (for internal-use only) PiperOrigin-RevId: 280708943 -- 3a48c346340c7ed03816645cd327e1ff07729aa4 by Abseil Team : Clean up public headers not to have warnings for "-Wcomma" PiperOrigin-RevId: 280695373 -- 981acd1ef3b13a83a84f04f11c8931f4ed4451c9 by Matthew Brown : Release absl::int128. PiperOrigin-RevId: 280690817 -- d30fae9d2ec30b81322d2eb5afe7e13e45b4b422 by Derek Mauro : Fix -Wundef warnings in random platform detection PiperOrigin-RevId: 280669598 GitOrigin-RevId: d447fdcb801036cf08197eece193a5a706661120 Change-Id: Ie5e10e567c54b7de211833607689f233d4ddf734 --- absl/numeric/int128_have_intrinsic.inc | 284 +++++++++++++++++++++++++++++++++ 1 file changed, 284 insertions(+) (limited to 'absl/numeric/int128_have_intrinsic.inc') diff --git a/absl/numeric/int128_have_intrinsic.inc b/absl/numeric/int128_have_intrinsic.inc index c7ea683..d6c76dd 100644 --- a/absl/numeric/int128_have_intrinsic.inc +++ b/absl/numeric/int128_have_intrinsic.inc @@ -16,3 +16,287 @@ // This file contains :int128 implementation details that depend on internal // representation when ABSL_HAVE_INTRINSIC_INT128 is defined. This file is // included by int128.h and relies on ABSL_INTERNAL_WCHAR_T being defined. + +namespace int128_internal { + +// Casts from unsigned to signed while preserving the underlying binary +// representation. +constexpr __int128 BitCastToSigned(unsigned __int128 v) { + // Casting an unsigned integer to a signed integer of the same + // width is implementation defined behavior if the source value would not fit + // in the destination type. We step around it with a roundtrip bitwise not + // operation to make sure this function remains constexpr. Clang and GCC + // optimize this to a no-op on x86-64. + return v & (static_cast(1) << 127) + ? ~static_cast<__int128>(~v) + : static_cast<__int128>(v); +} + +} // namespace int128_internal + +inline int128& int128::operator=(__int128 v) { + v_ = v; + return *this; +} + +constexpr uint64_t Int128Low64(int128 v) { + return static_cast(v.v_ & ~uint64_t{0}); +} + +constexpr int64_t Int128High64(int128 v) { + // Initially cast to unsigned to prevent a right shift on a negative value. + return int128_internal::BitCastToSigned( + static_cast(static_cast(v.v_) >> 64)); +} + +constexpr int128::int128(int64_t high, uint64_t low) + // Initially cast to unsigned to prevent a left shift that overflows. + : v_(int128_internal::BitCastToSigned(static_cast(high) + << 64) | + low) {} + + +constexpr int128::int128(int v) : v_{v} {} + +constexpr int128::int128(long v) : v_{v} {} // NOLINT(runtime/int) + +constexpr int128::int128(long long v) : v_{v} {} // NOLINT(runtime/int) + +constexpr int128::int128(__int128 v) : v_{v} {} + +constexpr int128::int128(unsigned int v) : v_{v} {} + +constexpr int128::int128(unsigned long v) : v_{v} {} // NOLINT(runtime/int) + +// NOLINTNEXTLINE(runtime/int) +constexpr int128::int128(unsigned long long v) : v_{v} {} + +constexpr int128::int128(unsigned __int128 v) : v_{static_cast<__int128>(v)} {} + +inline int128::int128(float v) { + v_ = static_cast<__int128>(v); +} + +inline int128::int128(double v) { + v_ = static_cast<__int128>(v); +} + +inline int128::int128(long double v) { + v_ = static_cast<__int128>(v); +} + +constexpr int128::int128(uint128 v) : v_{static_cast<__int128>(v)} {} + +constexpr int128::operator bool() const { return static_cast(v_); } + +constexpr int128::operator char() const { return static_cast(v_); } + +constexpr int128::operator signed char() const { + return static_cast(v_); +} + +constexpr int128::operator unsigned char() const { + return static_cast(v_); +} + +constexpr int128::operator char16_t() const { + return static_cast(v_); +} + +constexpr int128::operator char32_t() const { + return static_cast(v_); +} + +constexpr int128::operator ABSL_INTERNAL_WCHAR_T() const { + return static_cast(v_); +} + +constexpr int128::operator short() const { // NOLINT(runtime/int) + return static_cast(v_); // NOLINT(runtime/int) +} + +constexpr int128::operator unsigned short() const { // NOLINT(runtime/int) + return static_cast(v_); // NOLINT(runtime/int) +} + +constexpr int128::operator int() const { + return static_cast(v_); +} + +constexpr int128::operator unsigned int() const { + return static_cast(v_); +} + +constexpr int128::operator long() const { // NOLINT(runtime/int) + return static_cast(v_); // NOLINT(runtime/int) +} + +constexpr int128::operator unsigned long() const { // NOLINT(runtime/int) + return static_cast(v_); // NOLINT(runtime/int) +} + +constexpr int128::operator long long() const { // NOLINT(runtime/int) + return static_cast(v_); // NOLINT(runtime/int) +} + +constexpr int128::operator unsigned long long() const { // NOLINT(runtime/int) + return static_cast(v_); // NOLINT(runtime/int) +} + +constexpr int128::operator __int128() const { return v_; } + +constexpr int128::operator unsigned __int128() const { + return static_cast(v_); +} + +// Clang on PowerPC sometimes produces incorrect __int128 to floating point +// conversions. In that case, we do the conversion with a similar implementation +// to the conversion operators in int128_no_intrinsic.inc. +#if defined(__clang__) && !defined(__ppc64__) +inline int128::operator float() const { return static_cast(v_); } + +inline int128::operator double () const { return static_cast(v_); } + +inline int128::operator long double() const { + return static_cast(v_); +} + +#else // Clang on PowerPC +// Forward declaration for conversion operators to floating point types. +int128 operator-(int128 v); +bool operator!=(int128 lhs, int128 rhs); + +inline int128::operator float() const { + // We must convert the absolute value and then negate as needed, because + // floating point types are typically sign-magnitude. Otherwise, the + // difference between the high and low 64 bits when interpreted as two's + // complement overwhelms the precision of the mantissa. + // + // Also check to make sure we don't negate Int128Min() + return v_ < 0 && *this != Int128Min() + ? -static_cast(-*this) + : static_cast(Int128Low64(*this)) + + std::ldexp(static_cast(Int128High64(*this)), 64); +} + +inline int128::operator double() const { + // See comment in int128::operator float() above. + return v_ < 0 && *this != Int128Min() + ? -static_cast(-*this) + : static_cast(Int128Low64(*this)) + + std::ldexp(static_cast(Int128High64(*this)), 64); +} + +inline int128::operator long double() const { + // See comment in int128::operator float() above. + return v_ < 0 && *this != Int128Min() + ? -static_cast(-*this) + : static_cast(Int128Low64(*this)) + + std::ldexp(static_cast(Int128High64(*this)), + 64); +} +#endif // Clang on PowerPC + +// Comparison operators. + +inline bool operator==(int128 lhs, int128 rhs) { + return static_cast<__int128>(lhs) == static_cast<__int128>(rhs); +} + +inline bool operator!=(int128 lhs, int128 rhs) { + return static_cast<__int128>(lhs) != static_cast<__int128>(rhs); +} + +inline bool operator<(int128 lhs, int128 rhs) { + return static_cast<__int128>(lhs) < static_cast<__int128>(rhs); +} + +inline bool operator>(int128 lhs, int128 rhs) { + return static_cast<__int128>(lhs) > static_cast<__int128>(rhs); +} + +inline bool operator<=(int128 lhs, int128 rhs) { + return static_cast<__int128>(lhs) <= static_cast<__int128>(rhs); +} + +inline bool operator>=(int128 lhs, int128 rhs) { + return static_cast<__int128>(lhs) >= static_cast<__int128>(rhs); +} + +// Unary operators. + +inline int128 operator-(int128 v) { + return -static_cast<__int128>(v); +} + +inline bool operator!(int128 v) { + return !static_cast<__int128>(v); +} + +inline int128 operator~(int128 val) { + return ~static_cast<__int128>(val); +} + +// Arithmetic operators. + +inline int128 operator+(int128 lhs, int128 rhs) { + return static_cast<__int128>(lhs) + static_cast<__int128>(rhs); +} + +inline int128 operator-(int128 lhs, int128 rhs) { + return static_cast<__int128>(lhs) - static_cast<__int128>(rhs); +} + +inline int128 operator*(int128 lhs, int128 rhs) { + return static_cast<__int128>(lhs) * static_cast<__int128>(rhs); +} + +inline int128 operator/(int128 lhs, int128 rhs) { + return static_cast<__int128>(lhs) / static_cast<__int128>(rhs); +} + +inline int128 operator%(int128 lhs, int128 rhs) { + return static_cast<__int128>(lhs) % static_cast<__int128>(rhs); +} + +inline int128 int128::operator++(int) { + int128 tmp(*this); + ++v_; + return tmp; +} + +inline int128 int128::operator--(int) { + int128 tmp(*this); + --v_; + return tmp; +} + +inline int128& int128::operator++() { + ++v_; + return *this; +} + +inline int128& int128::operator--() { + --v_; + return *this; +} + +inline int128 operator|(int128 lhs, int128 rhs) { + return static_cast<__int128>(lhs) | static_cast<__int128>(rhs); +} + +inline int128 operator&(int128 lhs, int128 rhs) { + return static_cast<__int128>(lhs) & static_cast<__int128>(rhs); +} + +inline int128 operator^(int128 lhs, int128 rhs) { + return static_cast<__int128>(lhs) ^ static_cast<__int128>(rhs); +} + +inline int128 operator<<(int128 lhs, int amount) { + return static_cast<__int128>(lhs) << amount; +} + +inline int128 operator>>(int128 lhs, int amount) { + return static_cast<__int128>(lhs) >> amount; +} -- cgit v1.2.3