From fcb104594b0bb4b8ac306cb2f55ecdad40974683 Mon Sep 17 00:00:00 2001 From: Abseil Team Date: Tue, 4 Dec 2018 11:01:12 -0800 Subject: Creation of LTS branch "lts_2018_12_18" - 44b0fafc62d9b8f192e8180cbe9c4b806b339d57 Export of internal Abseil changes. by Abseil Team - 926bfeb9fff223429c12224b7514243886323e8d Export of internal Abseil changes. by Abseil Team - 13327debebc5c2d1d4991b69fe50450e340e50e4 Export of internal Abseil changes. by Abseil Team - 3088e76c597e068479e82508b1770a7ad0c806b6 Export of internal Abseil changes. by Abseil Team - f6ae816808cd913e0e2b3e2af14f328fa1071af0 Export of internal Abseil changes. by Abseil Team - a06c4a1d9093137b7217a5aaba8920d62e835dc0 Export of internal Abseil changes. by Abseil Team - 7b46e1d31a6b08b1c6da2a13e7b151a20446fa07 Export of internal Abseil changes. by Abseil Team - 070f6e47b33a2909d039e620c873204f78809492 Export of internal Abseil changes. by Abseil Team - 7990fd459e9339467814ddb95000c87cb1e4d945 Export of internal Abseil changes. by Abseil Team - 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87a4c07856e7dc69958019d47b2f02ae47746ec0 Export of internal Abseil changes. by Abseil Team - 4491d606df34c44efda47b6d17b605262f17e182 Export of internal Abseil changes. by Abseil Team GitOrigin-RevId: 44b0fafc62d9b8f192e8180cbe9c4b806b339d57 Change-Id: I2c427b5b41b2d34101922048b00f3d9dafcb498d --- absl/numeric/int128.h | 94 ++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 81 insertions(+), 13 deletions(-) (limited to 'absl/numeric/int128.h') diff --git a/absl/numeric/int128.h b/absl/numeric/int128.h index 96f42a83..cb4776f1 100644 --- a/absl/numeric/int128.h +++ b/absl/numeric/int128.h @@ -31,13 +31,19 @@ #include #include #include +#include #include "absl/base/config.h" #include "absl/base/macros.h" #include "absl/base/port.h" +#if defined(_MSC_VER) && defined(_WIN64) +#include +#pragma intrinsic(_umul128) +#endif // defined(_MSC_VER) && defined(_WIN64) + namespace absl { -inline namespace lts_2018_06_20 { +inline namespace lts_2018_12_18 { // uint128 @@ -192,6 +198,12 @@ class // Returns the highest value for a 128-bit unsigned integer. friend constexpr uint128 Uint128Max(); + // Support for absl::Hash. + template + friend H AbslHashValue(H h, uint128 v) { + return H::combine(std::move(h), Uint128High64(v), Uint128Low64(v)); + } + private: constexpr uint128(uint64_t high, uint64_t low); @@ -220,21 +232,71 @@ std::ostream& operator<<(std::ostream& os, uint128 v); // TODO(strel) add operator>>(std::istream&, uint128) +constexpr uint128 Uint128Max() { + return uint128((std::numeric_limits::max)(), + (std::numeric_limits::max)()); +} + +} // inline namespace lts_2018_12_18 +} // namespace absl + +// Specialized numeric_limits for uint128. +namespace std { +template <> +class numeric_limits { + public: + static constexpr bool is_specialized = true; + static constexpr bool is_signed = false; + static constexpr bool is_integer = true; + static constexpr bool is_exact = true; + static constexpr bool has_infinity = false; + static constexpr bool has_quiet_NaN = false; + static constexpr bool has_signaling_NaN = false; + static constexpr float_denorm_style has_denorm = denorm_absent; + static constexpr bool has_denorm_loss = false; + static constexpr float_round_style round_style = round_toward_zero; + static constexpr bool is_iec559 = false; + static constexpr bool is_bounded = true; + static constexpr bool is_modulo = true; + static constexpr int digits = 128; + static constexpr int digits10 = 38; + static constexpr int max_digits10 = 0; + static constexpr int radix = 2; + static constexpr int min_exponent = 0; + static constexpr int min_exponent10 = 0; + static constexpr int max_exponent = 0; + static constexpr int max_exponent10 = 0; +#ifdef ABSL_HAVE_INTRINSIC_INT128 + static constexpr bool traps = numeric_limits::traps; +#else // ABSL_HAVE_INTRINSIC_INT128 + static constexpr bool traps = numeric_limits::traps; +#endif // ABSL_HAVE_INTRINSIC_INT128 + static constexpr bool tinyness_before = false; + + static constexpr absl::uint128 min() { return 0; } + static constexpr absl::uint128 lowest() { return 0; } + static constexpr absl::uint128 max() { return absl::Uint128Max(); } + static constexpr absl::uint128 epsilon() { return 0; } + static constexpr absl::uint128 round_error() { return 0; } + static constexpr absl::uint128 infinity() { return 0; } + static constexpr absl::uint128 quiet_NaN() { return 0; } + static constexpr absl::uint128 signaling_NaN() { return 0; } + static constexpr absl::uint128 denorm_min() { return 0; } +}; +} // namespace std + // TODO(absl-team): Implement signed 128-bit type // -------------------------------------------------------------------------- // Implementation details follow // -------------------------------------------------------------------------- +namespace absl { +inline namespace lts_2018_12_18 { constexpr uint128 MakeUint128(uint64_t high, uint64_t low) { return uint128(high, low); } -constexpr uint128 Uint128Max() { - return uint128(std::numeric_limits::max(), - std::numeric_limits::max()); -} - // Assignment from integer types. inline uint128& uint128::operator=(int v) { return *this = uint128(v); } @@ -330,13 +392,13 @@ constexpr uint128::uint128(uint64_t high, uint64_t low) constexpr uint128::uint128(int v) : lo_{static_cast(v)}, - hi_{v < 0 ? std::numeric_limits::max() : 0} {} + hi_{v < 0 ? (std::numeric_limits::max)() : 0} {} constexpr uint128::uint128(long v) // NOLINT(runtime/int) : lo_{static_cast(v)}, - hi_{v < 0 ? std::numeric_limits::max() : 0} {} + hi_{v < 0 ? (std::numeric_limits::max)() : 0} {} constexpr uint128::uint128(long long v) // NOLINT(runtime/int) : lo_{static_cast(v)}, - hi_{v < 0 ? std::numeric_limits::max() : 0} {} + hi_{v < 0 ? (std::numeric_limits::max)() : 0} {} constexpr uint128::uint128(unsigned int v) : lo_{v}, hi_{0} {} // NOLINTNEXTLINE(runtime/int) @@ -359,13 +421,13 @@ constexpr uint128::uint128(uint64_t high, uint64_t low) : hi_{high}, lo_{low} {} constexpr uint128::uint128(int v) - : hi_{v < 0 ? std::numeric_limits::max() : 0}, + : hi_{v < 0 ? (std::numeric_limits::max)() : 0}, lo_{static_cast(v)} {} constexpr uint128::uint128(long v) // NOLINT(runtime/int) - : hi_{v < 0 ? std::numeric_limits::max() : 0}, + : hi_{v < 0 ? (std::numeric_limits::max)() : 0}, lo_{static_cast(v)} {} constexpr uint128::uint128(long long v) // NOLINT(runtime/int) - : hi_{v < 0 ? std::numeric_limits::max() : 0}, + : hi_{v < 0 ? (std::numeric_limits::max)() : 0}, lo_{static_cast(v)} {} constexpr uint128::uint128(unsigned int v) : hi_{0}, lo_{v} {} @@ -607,6 +669,12 @@ inline uint128 operator*(uint128 lhs, uint128 rhs) { // can be used for uint128 storage. return static_cast(lhs) * static_cast(rhs); +#elif defined(_MSC_VER) && defined(_WIN64) + uint64_t carry; + uint64_t low = _umul128(Uint128Low64(lhs), Uint128Low64(rhs), &carry); + return MakeUint128(Uint128Low64(lhs) * Uint128High64(rhs) + + Uint128High64(lhs) * Uint128Low64(rhs) + carry, + low); #else // ABSL_HAVE_INTRINSIC128 uint64_t a32 = Uint128Low64(lhs) >> 32; uint64_t a00 = Uint128Low64(lhs) & 0xffffffff; @@ -652,7 +720,7 @@ inline uint128& uint128::operator--() { #include "absl/numeric/int128_no_intrinsic.inc" #endif // ABSL_HAVE_INTRINSIC_INT128 -} // inline namespace lts_2018_06_20 +} // inline namespace lts_2018_12_18 } // namespace absl #endif // ABSL_NUMERIC_INT128_H_ -- cgit v1.2.3