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107 lines
2.8 KiB
C++
107 lines
2.8 KiB
C++
#pragma once
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namespace common
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{
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template <typename T>
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inline bool addOverflow(T x, T y, T & res)
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{
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return __builtin_add_overflow(x, y, &res);
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}
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template <>
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inline bool addOverflow(int x, int y, int & res)
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{
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return __builtin_sadd_overflow(x, y, &res);
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}
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template <>
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inline bool addOverflow(long x, long y, long & res)
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{
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return __builtin_saddl_overflow(x, y, &res);
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}
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template <>
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inline bool addOverflow(long long x, long long y, long long & res)
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{
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return __builtin_saddll_overflow(x, y, &res);
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}
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template <>
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inline bool addOverflow(__int128 x, __int128 y, __int128 & res)
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{
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static constexpr __int128 min_int128 = __int128(0x8000000000000000ll) << 64;
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static constexpr __int128 max_int128 = (__int128(0x7fffffffffffffffll) << 64) + 0xffffffffffffffffll;
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res = x + y;
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return (y > 0 && x > max_int128 - y) || (y < 0 && x < min_int128 - y);
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}
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template <typename T>
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inline bool subOverflow(T x, T y, T & res)
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{
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return __builtin_sub_overflow(x, y, &res);
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}
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template <>
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inline bool subOverflow(int x, int y, int & res)
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{
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return __builtin_ssub_overflow(x, y, &res);
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}
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template <>
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inline bool subOverflow(long x, long y, long & res)
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{
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return __builtin_ssubl_overflow(x, y, &res);
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}
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template <>
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inline bool subOverflow(long long x, long long y, long long & res)
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{
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return __builtin_ssubll_overflow(x, y, &res);
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}
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template <>
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inline bool subOverflow(__int128 x, __int128 y, __int128 & res)
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{
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static constexpr __int128 min_int128 = __int128(0x8000000000000000ll) << 64;
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static constexpr __int128 max_int128 = (__int128(0x7fffffffffffffffll) << 64) + 0xffffffffffffffffll;
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res = x - y;
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return (y < 0 && x > max_int128 + y) || (y > 0 && x < min_int128 + y);
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}
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template <typename T>
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inline bool mulOverflow(T x, T y, T & res)
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{
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return __builtin_mul_overflow(x, y, &res);
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}
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template <>
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inline bool mulOverflow(int x, int y, int & res)
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{
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return __builtin_smul_overflow(x, y, &res);
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}
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template <>
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inline bool mulOverflow(long x, long y, long & res)
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{
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return __builtin_smull_overflow(x, y, &res);
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}
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template <>
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inline bool mulOverflow(long long x, long long y, long long & res)
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{
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return __builtin_smulll_overflow(x, y, &res);
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}
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template <>
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inline bool mulOverflow(__int128 x, __int128 y, __int128 & res)
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{
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res = static_cast<unsigned __int128>(x) * static_cast<unsigned __int128>(y); /// Avoid signed integer overflow.
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if (!x || !y)
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return false;
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unsigned __int128 a = (x > 0) ? x : -x;
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unsigned __int128 b = (y > 0) ? y : -y;
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return (a * b) / b != a;
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}
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}
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