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187 lines
4.7 KiB
C++
187 lines
4.7 KiB
C++
#pragma once
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#include <common/extended_types.h>
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#include <common/defines.h>
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namespace common
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{
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/// Multiply and ignore overflow.
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template <typename T1, typename T2>
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inline auto NO_SANITIZE_UNDEFINED mulIgnoreOverflow(T1 x, T2 y)
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{
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return x * y;
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}
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template <typename T1, typename T2>
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inline auto NO_SANITIZE_UNDEFINED addIgnoreOverflow(T1 x, T2 y)
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{
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return x + y;
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}
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template <typename T1, typename T2>
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inline auto NO_SANITIZE_UNDEFINED subIgnoreOverflow(T1 x, T2 y)
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{
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return x - y;
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}
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template <typename T>
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inline auto NO_SANITIZE_UNDEFINED negateIgnoreOverflow(T x)
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{
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return -x;
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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 = minInt128();
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static constexpr __int128 max_int128 = maxInt128();
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res = addIgnoreOverflow(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 <>
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inline bool addOverflow(wInt256 x, wInt256 y, wInt256 & res)
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{
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res = addIgnoreOverflow(x, y);
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return (y > 0 && x > std::numeric_limits<wInt256>::max() - y) ||
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(y < 0 && x < std::numeric_limits<wInt256>::min() - y);
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}
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template <>
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inline bool addOverflow(wUInt256 x, wUInt256 y, wUInt256 & res)
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{
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res = addIgnoreOverflow(x, y);
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return x > std::numeric_limits<wUInt256>::max() - 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 = minInt128();
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static constexpr __int128 max_int128 = maxInt128();
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res = subIgnoreOverflow(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 <>
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inline bool subOverflow(wInt256 x, wInt256 y, wInt256 & res)
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{
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res = subIgnoreOverflow(x, y);
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return (y < 0 && x > std::numeric_limits<wInt256>::max() + y) ||
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(y > 0 && x < std::numeric_limits<wInt256>::min() + y);
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}
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template <>
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inline bool subOverflow(wUInt256 x, wUInt256 y, wUInt256 & res)
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{
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res = subIgnoreOverflow(x, y);
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return x < 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 = mulIgnoreOverflow(x, y);
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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 mulIgnoreOverflow(a, b) / b != a;
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}
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template <>
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inline bool mulOverflow(wInt256 x, wInt256 y, wInt256 & res)
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{
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res = mulIgnoreOverflow(x, y);
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if (!x || !y)
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return false;
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wInt256 a = (x > 0) ? x : -x;
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wInt256 b = (y > 0) ? y : -y;
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return mulIgnoreOverflow(a, b) / b != a;
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}
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template <>
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inline bool mulOverflow(wUInt256 x, wUInt256 y, wUInt256 & res)
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{
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res = mulIgnoreOverflow(x, y);
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if (!x || !y)
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return false;
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return res / y != x;
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}
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}
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