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author | Android Build Coastguard Worker <android-build-coastguard-worker@google.com> | 2022-04-28 16:01:35 +0000 |
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committer | Android Build Coastguard Worker <android-build-coastguard-worker@google.com> | 2022-04-28 16:01:35 +0000 |
commit | 2ce195a4ebcb305b9320436273d9d23c717ad6f4 (patch) | |
tree | 2ce94d7f0804ccb77d1fa9b2a1bca00eecdff1e2 /third_party/abseil-cpp/absl/numeric/int128_no_intrinsic.inc | |
parent | cde6b2521fd8eb70e0fee633ec726ad687286c67 (diff) | |
parent | 7563023510bf04108a954596ea9393a4c11ac279 (diff) | |
download | webrtc-2ce195a4ebcb305b9320436273d9d23c717ad6f4.tar.gz |
Snap for 8512216 from 7563023510bf04108a954596ea9393a4c11ac279 to tm-frc-media-swcodec-releaset_frc_swc_330443040t_frc_swc_330443010android13-frc-media-swcodec-release
Change-Id: I9b0c9de1523358ec00bf7c85bb225b8f5639364b
Diffstat (limited to 'third_party/abseil-cpp/absl/numeric/int128_no_intrinsic.inc')
-rw-r--r-- | third_party/abseil-cpp/absl/numeric/int128_no_intrinsic.inc | 143 |
1 files changed, 73 insertions, 70 deletions
diff --git a/third_party/abseil-cpp/absl/numeric/int128_no_intrinsic.inc b/third_party/abseil-cpp/absl/numeric/int128_no_intrinsic.inc index c753771ae7..8834804cec 100644 --- a/third_party/abseil-cpp/absl/numeric/int128_no_intrinsic.inc +++ b/third_party/abseil-cpp/absl/numeric/int128_no_intrinsic.inc @@ -134,10 +134,6 @@ constexpr int128::operator unsigned long long() const { // NOLINT(runtime/int) return static_cast<unsigned long long>(lo_); // NOLINT(runtime/int) } -// 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 @@ -169,76 +165,80 @@ inline int128::operator long double() const { // Comparison operators. -inline bool operator==(int128 lhs, int128 rhs) { +constexpr bool operator==(int128 lhs, int128 rhs) { return (Int128Low64(lhs) == Int128Low64(rhs) && Int128High64(lhs) == Int128High64(rhs)); } -inline bool operator!=(int128 lhs, int128 rhs) { - return !(lhs == rhs); -} +constexpr bool operator!=(int128 lhs, int128 rhs) { return !(lhs == rhs); } -inline bool operator<(int128 lhs, int128 rhs) { +constexpr bool operator<(int128 lhs, int128 rhs) { return (Int128High64(lhs) == Int128High64(rhs)) ? (Int128Low64(lhs) < Int128Low64(rhs)) : (Int128High64(lhs) < Int128High64(rhs)); } -inline bool operator>(int128 lhs, int128 rhs) { +constexpr bool operator>(int128 lhs, int128 rhs) { return (Int128High64(lhs) == Int128High64(rhs)) ? (Int128Low64(lhs) > Int128Low64(rhs)) : (Int128High64(lhs) > Int128High64(rhs)); } -inline bool operator<=(int128 lhs, int128 rhs) { - return !(lhs > rhs); -} +constexpr bool operator<=(int128 lhs, int128 rhs) { return !(lhs > rhs); } -inline bool operator>=(int128 lhs, int128 rhs) { - return !(lhs < rhs); -} +constexpr bool operator>=(int128 lhs, int128 rhs) { return !(lhs < rhs); } // Unary operators. -inline int128 operator-(int128 v) { - int64_t hi = ~Int128High64(v); - uint64_t lo = ~Int128Low64(v) + 1; - if (lo == 0) ++hi; // carry - return MakeInt128(hi, lo); +constexpr int128 operator-(int128 v) { + return MakeInt128(~Int128High64(v) + (Int128Low64(v) == 0), + ~Int128Low64(v) + 1); } -inline bool operator!(int128 v) { +constexpr bool operator!(int128 v) { return !Int128Low64(v) && !Int128High64(v); } -inline int128 operator~(int128 val) { +constexpr int128 operator~(int128 val) { return MakeInt128(~Int128High64(val), ~Int128Low64(val)); } // Arithmetic operators. -inline int128 operator+(int128 lhs, int128 rhs) { - int128 result = MakeInt128(Int128High64(lhs) + Int128High64(rhs), - Int128Low64(lhs) + Int128Low64(rhs)); - if (Int128Low64(result) < Int128Low64(lhs)) { // check for carry - return MakeInt128(Int128High64(result) + 1, Int128Low64(result)); - } - return result; +namespace int128_internal { +constexpr int128 SignedAddResult(int128 result, int128 lhs) { + // check for carry + return (Int128Low64(result) < Int128Low64(lhs)) + ? MakeInt128(Int128High64(result) + 1, Int128Low64(result)) + : result; +} +} // namespace int128_internal +constexpr int128 operator+(int128 lhs, int128 rhs) { + return int128_internal::SignedAddResult( + MakeInt128(Int128High64(lhs) + Int128High64(rhs), + Int128Low64(lhs) + Int128Low64(rhs)), + lhs); } -inline int128 operator-(int128 lhs, int128 rhs) { - int128 result = MakeInt128(Int128High64(lhs) - Int128High64(rhs), - Int128Low64(lhs) - Int128Low64(rhs)); - if (Int128Low64(lhs) < Int128Low64(rhs)) { // check for carry - return MakeInt128(Int128High64(result) - 1, Int128Low64(result)); - } - return result; +namespace int128_internal { +constexpr int128 SignedSubstructResult(int128 result, int128 lhs, int128 rhs) { + // check for carry + return (Int128Low64(lhs) < Int128Low64(rhs)) + ? MakeInt128(Int128High64(result) - 1, Int128Low64(result)) + : result; +} +} // namespace int128_internal +constexpr int128 operator-(int128 lhs, int128 rhs) { + return int128_internal::SignedSubstructResult( + MakeInt128(Int128High64(lhs) - Int128High64(rhs), + Int128Low64(lhs) - Int128Low64(rhs)), + lhs, rhs); } inline int128 operator*(int128 lhs, int128 rhs) { - uint128 result = uint128(lhs) * rhs; - return MakeInt128(int128_internal::BitCastToSigned(Uint128High64(result)), - Uint128Low64(result)); + return MakeInt128( + int128_internal::BitCastToSigned(Uint128High64(uint128(lhs) * rhs)), + Uint128Low64(uint128(lhs) * rhs)); } inline int128 int128::operator++(int) { @@ -263,46 +263,49 @@ inline int128& int128::operator--() { return *this; } -inline int128 operator|(int128 lhs, int128 rhs) { +constexpr int128 operator|(int128 lhs, int128 rhs) { return MakeInt128(Int128High64(lhs) | Int128High64(rhs), Int128Low64(lhs) | Int128Low64(rhs)); } -inline int128 operator&(int128 lhs, int128 rhs) { +constexpr int128 operator&(int128 lhs, int128 rhs) { return MakeInt128(Int128High64(lhs) & Int128High64(rhs), Int128Low64(lhs) & Int128Low64(rhs)); } -inline int128 operator^(int128 lhs, int128 rhs) { +constexpr int128 operator^(int128 lhs, int128 rhs) { return MakeInt128(Int128High64(lhs) ^ Int128High64(rhs), Int128Low64(lhs) ^ Int128Low64(rhs)); } -inline int128 operator<<(int128 lhs, int amount) { - // uint64_t shifts of >= 64 are undefined, so we need some special-casing. - if (amount < 64) { - if (amount != 0) { - return MakeInt128( - (Int128High64(lhs) << amount) | - static_cast<int64_t>(Int128Low64(lhs) >> (64 - amount)), - Int128Low64(lhs) << amount); - } - return lhs; - } - return MakeInt128(static_cast<int64_t>(Int128Low64(lhs) << (amount - 64)), 0); -} - -inline int128 operator>>(int128 lhs, int amount) { - // uint64_t shifts of >= 64 are undefined, so we need some special-casing. - if (amount < 64) { - if (amount != 0) { - return MakeInt128( - Int128High64(lhs) >> amount, - (Int128Low64(lhs) >> amount) | - (static_cast<uint64_t>(Int128High64(lhs)) << (64 - amount))); - } - return lhs; - } - return MakeInt128(0, - static_cast<uint64_t>(Int128High64(lhs) >> (amount - 64))); +constexpr int128 operator<<(int128 lhs, int amount) { + // int64_t shifts of >= 64 are undefined, so we need some special-casing. + return amount >= 64 + ? MakeInt128( + static_cast<int64_t>(Int128Low64(lhs) << (amount - 64)), 0) + : amount == 0 + ? lhs + : MakeInt128( + (Int128High64(lhs) << amount) | + static_cast<int64_t>(Int128Low64(lhs) >> (64 - amount)), + Int128Low64(lhs) << amount); +} + +constexpr int128 operator>>(int128 lhs, int amount) { + // int64_t shifts of >= 64 are undefined, so we need some special-casing. + // The (Int128High64(lhs) >> 32) >> 32 "trick" causes the the most significant + // int64 to be inititialized with all zeros or all ones correctly. It takes + // into account whether the number is negative or positive, and whether the + // current architecture does arithmetic or logical right shifts for negative + // numbers. + return amount >= 64 + ? MakeInt128( + (Int128High64(lhs) >> 32) >> 32, + static_cast<uint64_t>(Int128High64(lhs) >> (amount - 64))) + : amount == 0 + ? lhs + : MakeInt128(Int128High64(lhs) >> amount, + (Int128Low64(lhs) >> amount) | + (static_cast<uint64_t>(Int128High64(lhs)) + << (64 - amount))); } |