Changeset - r25847:0442c31cead2
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Charles Pigott - 3 years ago 2021-07-20 08:05:08
charlespigott@googlemail.com
Codechange: Make OverflowSafeInt constexpr
1 file changed with 80 insertions and 73 deletions:
src/core/overflowsafe_type.hpp
80
73
0 comments (0 inline, 0 general)
src/core/overflowsafe_type.hpp
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@@ -36,21 +36,21 @@ private:
 
	/** The non-overflow safe backend to store the value in. */
 
	T m_value;
 
public:
 
	OverflowSafeInt() : m_value(0) { }
 
	constexpr OverflowSafeInt() : m_value(0) { }
 

			




	
	
	
		
 
	OverflowSafeInt(const OverflowSafeInt& other) { this->m_value = other.m_value; }

			




	
	
	
		
 
	OverflowSafeInt(const int64 int_)             { this->m_value = int_; }

			




	
	
	
		
 
	constexpr OverflowSafeInt(const OverflowSafeInt& other) : m_value(other.m_value) { }

			




	
	
	
		
 
	constexpr OverflowSafeInt(const int64 int_) : m_value(int_) { }

			




	
	
	
		
 

			




	
	
	
		
 
	inline OverflowSafeInt& operator = (const OverflowSafeInt& other) { this->m_value = other.m_value; return *this; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt& operator = (const OverflowSafeInt& other) { this->m_value = other.m_value; return *this; }

			




	
	
	
		
 

			




	
	
	
		
 
	inline OverflowSafeInt operator - () const { return OverflowSafeInt(this->m_value == T_MIN ? T_MAX : -this->m_value); }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt operator - () const { return OverflowSafeInt(this->m_value == T_MIN ? T_MAX : -this->m_value); }

			




	
	
	
		
 

			




	
	
	
		
 
	/**

			




	
	
	
		
 
	 * Safe implementation of addition.

			




	
	
	
		
 
	 * @param other the amount to add

			




	
	
	
		
 
	 * @note when the addition would yield more than T_MAX, it will be T_MAX.

			




	
	
	
		
 
	 */

			




	
	
	
		
 
	inline OverflowSafeInt& operator += (const OverflowSafeInt& other)

			




	
	
	
		
 
	inline constexpr OverflowSafeInt& operator += (const OverflowSafeInt& other)

			




	
	
	
		
 
	{

			




	
	
	
		
 
#ifdef HAS_OVERFLOW_BUILTINS

			




	
	
	
		
 
		if (unlikely(__builtin_add_overflow(this->m_value, other.m_value, &this->m_value))) {

			




	
	
		
 
@@ -73,7 +73,7 @@ public:

			




	
	
	
		
 
	 * @param other the amount to subtract

			




	
	
	
		
 
	 * @note when the subtraction would yield less than T_MIN, it will be T_MIN.

			




	
	
	
		
 
	 */

			




	
	
	
		
 
	inline OverflowSafeInt& operator -= (const OverflowSafeInt& other)

			




	
	
	
		
 
	inline constexpr OverflowSafeInt& operator -= (const OverflowSafeInt& other)

			




	
	
	
		
 
	{

			




	
	
	
		
 
#ifdef HAS_OVERFLOW_BUILTINS

			




	
	
	
		
 
		if (unlikely(__builtin_sub_overflow(this->m_value, other.m_value, &this->m_value))) {

			




	
	
		
 
@@ -91,18 +91,18 @@ public:

			




	
	
	
		
 
		return *this;

			




	
	
	
		
 
	}

			




	
	
	
		
 

			




	
	
	
		
 
	/* Operators for addition and subtraction */

			




	
	
	
		
 
	inline OverflowSafeInt  operator +  (const OverflowSafeInt& other) const { OverflowSafeInt result = *this; result += other; return result; }

			




	
	
	
		
 
	inline OverflowSafeInt  operator +  (const int              other) const { OverflowSafeInt result = *this; result += (int64)other; return result; }

			




	
	
	
		
 
	inline OverflowSafeInt  operator +  (const uint             other) const { OverflowSafeInt result = *this; result += (int64)other; return result; }

			




	
	
	
		
 
	inline OverflowSafeInt  operator -  (const OverflowSafeInt& other) const { OverflowSafeInt result = *this; result -= other; return result; }

			




	
	
	
		
 
	inline OverflowSafeInt  operator -  (const int              other) const { OverflowSafeInt result = *this; result -= (int64)other; return result; }

			




	
	
	
		
 
	inline OverflowSafeInt  operator -  (const uint             other) const { OverflowSafeInt result = *this; result -= (int64)other; return result; }

			




	
	
	
		
 
	/* Operators for addition and subtraction. */

			




	
	
	
		
 
	inline constexpr OverflowSafeInt  operator +  (const OverflowSafeInt& other) const { OverflowSafeInt result = *this; result += other; return result; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt  operator +  (const int              other) const { OverflowSafeInt result = *this; result += (int64)other; return result; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt  operator +  (const uint             other) const { OverflowSafeInt result = *this; result += (int64)other; return result; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt  operator -  (const OverflowSafeInt& other) const { OverflowSafeInt result = *this; result -= other; return result; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt  operator -  (const int              other) const { OverflowSafeInt result = *this; result -= (int64)other; return result; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt  operator -  (const uint             other) const { OverflowSafeInt result = *this; result -= (int64)other; return result; }

			




	
	
	
		
 

			




	
	
	
		
 
	inline OverflowSafeInt& operator ++ () { return *this += 1; }

			




	
	
	
		
 
	inline OverflowSafeInt& operator -- () { return *this += -1; }

			




	
	
	
		
 
	inline OverflowSafeInt operator ++ (int) { OverflowSafeInt org = *this; *this += 1; return org; }

			




	
	
	
		
 
	inline OverflowSafeInt operator -- (int) { OverflowSafeInt org = *this; *this += -1; return org; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt& operator ++ () { return *this += 1; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt& operator -- () { return *this += -1; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt operator ++ (int) { OverflowSafeInt org = *this; *this += 1; return org; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt operator -- (int) { OverflowSafeInt org = *this; *this += -1; return org; }

			




	
	
	
		
 

			




	
	
	
		
 
	/**

			




	
	
	
		
 
	 * Safe implementation of multiplication.

			




	
	
		
 
@@ -110,10 +110,10 @@ public:

			




	
	
	
		
 
	 * @note when the multiplication would yield more than T_MAX (or less than T_MIN),

			




	
	
	
		
 
	 *       it will be T_MAX (respectively T_MIN).

			




	
	
	
		
 
	 */

			




	
	
	
		
 
	inline OverflowSafeInt& operator *= (const int factor)

			




	
	
	
		
 
	inline constexpr OverflowSafeInt& operator *= (const int factor)

			




	
	
	
		
 
	{

			




	
	
	
		
 
#ifdef HAS_OVERFLOW_BUILTINS

			




	
	
	
		
 
		bool is_result_positive = (this->m_value < 0) == (factor < 0); // -ve * -ve == +ve

			




	
	
	
		
 
		const bool is_result_positive = (this->m_value < 0) == (factor < 0); // -ve * -ve == +ve

			




	
	
	
		
 
		if (unlikely(__builtin_mul_overflow(this->m_value, factor, &this->m_value))) {

			




	
	
	
		
 
			this->m_value = is_result_positive ? T_MAX : T_MIN;

			




	
	
	
		
 
		}

			




	
	
		
 
@@ -135,75 +135,82 @@ public:

			




	
	
	
		
 
		return *this;

			




	
	
	
		
 
	}

			




	
	
	
		
 

			




	
	
	
		
 
	/* Operators for multiplication */

			




	
	
	
		
 
	inline OverflowSafeInt operator * (const int64  factor) const { OverflowSafeInt result = *this; result *= factor; return result; }

			




	
	
	
		
 
	inline OverflowSafeInt operator * (const int    factor) const { OverflowSafeInt result = *this; result *= (int64)factor; return result; }

			




	
	
	
		
 
	inline OverflowSafeInt operator * (const uint   factor) const { OverflowSafeInt result = *this; result *= (int64)factor; return result; }

			




	
	
	
		
 
	inline OverflowSafeInt operator * (const uint16 factor) const { OverflowSafeInt result = *this; result *= (int64)factor; return result; }

			




	
	
	
		
 
	inline OverflowSafeInt operator * (const byte   factor) const { OverflowSafeInt result = *this; result *= (int64)factor; return result; }

			




	
	
	
		
 
	/* Operators for multiplication. */

			




	
	
	
		
 
	inline constexpr OverflowSafeInt operator * (const int64  factor) const { OverflowSafeInt result = *this; result *= factor; return result; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt operator * (const int    factor) const { OverflowSafeInt result = *this; result *= (int64)factor; return result; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt operator * (const uint   factor) const { OverflowSafeInt result = *this; result *= (int64)factor; return result; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt operator * (const uint16 factor) const { OverflowSafeInt result = *this; result *= (int64)factor; return result; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt operator * (const byte   factor) const { OverflowSafeInt result = *this; result *= (int64)factor; return result; }

			




	
	
	
		
 

			




	
	
	
		
 
	/* Operators for division */

			




	
	
	
		
 
	inline OverflowSafeInt& operator /= (const int64            divisor)       { this->m_value /= divisor; return *this; }

			




	
	
	
		
 
	inline OverflowSafeInt  operator /  (const OverflowSafeInt& divisor) const { OverflowSafeInt result = *this; result /= divisor.m_value; return result; }

			




	
	
	
		
 
	inline OverflowSafeInt  operator /  (const int              divisor) const { OverflowSafeInt result = *this; result /= divisor; return result; }

			




	
	
	
		
 
	inline OverflowSafeInt  operator /  (const uint             divisor) const { OverflowSafeInt result = *this; result /= (int)divisor; return result; }

			




	
	
	
		
 
	/* Operators for division. */

			




	
	
	
		
 
	inline constexpr OverflowSafeInt& operator /= (const int64            divisor)       { this->m_value /= divisor; return *this; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt  operator /  (const OverflowSafeInt& divisor) const { OverflowSafeInt result = *this; result /= divisor.m_value; return result; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt  operator /  (const int              divisor) const { OverflowSafeInt result = *this; result /= divisor; return result; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt  operator /  (const uint             divisor) const { OverflowSafeInt result = *this; result /= (int)divisor; return result; }

			




	
	
	
		
 

			




	
	
	
		
 
	/* Operators for modulo */

			




	
	
	
		
 
	inline OverflowSafeInt& operator %= (const int  divisor)       { this->m_value %= divisor; return *this; }

			




	
	
	
		
 
	inline OverflowSafeInt  operator %  (const int  divisor) const { OverflowSafeInt result = *this; result %= divisor; return result; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt& operator %= (const int  divisor)       { this->m_value %= divisor; return *this; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt  operator %  (const int  divisor) const { OverflowSafeInt result = *this; result %= divisor; return result; }

			




	
	
	
		
 

			




	
	
	
		
 
	/* Operators for shifting */

			




	
	
	
		
 
	inline OverflowSafeInt& operator <<= (const int shift)       { this->m_value <<= shift; return *this; }

			




	
	
	
		
 
	inline OverflowSafeInt  operator <<  (const int shift) const { OverflowSafeInt result = *this; result <<= shift; return result; }

			




	
	
	
		
 
	inline OverflowSafeInt& operator >>= (const int shift)       { this->m_value >>= shift; return *this; }

			




	
	
	
		
 
	inline OverflowSafeInt  operator >>  (const int shift) const { OverflowSafeInt result = *this; result >>= shift; return result; }

			




	
	
	
		
 
	/* Operators for shifting. */

			




	
	
	
		
 
	inline constexpr OverflowSafeInt& operator <<= (const int shift)       { this->m_value <<= shift; return *this; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt  operator <<  (const int shift) const { OverflowSafeInt result = *this; result <<= shift; return result; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt& operator >>= (const int shift)       { this->m_value >>= shift; return *this; }

			




	
	
	
		
 
	inline constexpr OverflowSafeInt  operator >>  (const int shift) const { OverflowSafeInt result = *this; result >>= shift; return result; }

			




	
	
	
		
 

			




	
	
	
		
 
	/* Operators for (in)equality when comparing overflow safe ints */

			




	
	
	
		
 
	inline bool operator == (const OverflowSafeInt& other) const { return this->m_value == other.m_value; }

			




	
	
	
		
 
	inline bool operator != (const OverflowSafeInt& other) const { return !(*this == other); }

			




	
	
	
		
 
	inline bool operator >  (const OverflowSafeInt& other) const { return this->m_value > other.m_value; }

			




	
	
	
		
 
	inline bool operator >= (const OverflowSafeInt& other) const { return this->m_value >= other.m_value; }

			




	
	
	
		
 
	inline bool operator <  (const OverflowSafeInt& other) const { return !(*this >= other); }

			




	
	
	
		
 
	inline bool operator <= (const OverflowSafeInt& other) const { return !(*this > other); }

			




	
	
	
		
 
	/* Operators for (in)equality when comparing overflow safe ints. */

			




	
	
	
		
 
	inline constexpr bool operator == (const OverflowSafeInt& other) const { return this->m_value == other.m_value; }

			




	
	
	
		
 
	inline constexpr bool operator != (const OverflowSafeInt& other) const { return !(*this == other); }

			




	
	
	
		
 
	inline constexpr bool operator >  (const OverflowSafeInt& other) const { return this->m_value > other.m_value; }

			




	
	
	
		
 
	inline constexpr bool operator >= (const OverflowSafeInt& other) const { return this->m_value >= other.m_value; }

			




	
	
	
		
 
	inline constexpr bool operator <  (const OverflowSafeInt& other) const { return !(*this >= other); }

			




	
	
	
		
 
	inline constexpr bool operator <= (const OverflowSafeInt& other) const { return !(*this > other); }

			




	
	
	
		
 

			




	
	
	
		
 
	/* Operators for (in)equality when comparing non-overflow safe ints */

			




	
	
	
		
 
	inline bool operator == (const int other) const { return this->m_value == other; }

			




	
	
	
		
 
	inline bool operator != (const int other) const { return !(*this == other); }

			




	
	
	
		
 
	inline bool operator >  (const int other) const { return this->m_value > other; }

			




	
	
	
		
 
	inline bool operator >= (const int other) const { return this->m_value >= other; }

			




	
	
	
		
 
	inline bool operator <  (const int other) const { return !(*this >= other); }

			




	
	
	
		
 
	inline bool operator <= (const int other) const { return !(*this > other); }

			




	
	
	
		
 
	/* Operators for (in)equality when comparing non-overflow safe ints. */

			




	
	
	
		
 
	inline constexpr bool operator == (const int other) const { return this->m_value == other; }

			




	
	
	
		
 
	inline constexpr bool operator != (const int other) const { return !(*this == other); }

			




	
	
	
		
 
	inline constexpr bool operator >  (const int other) const { return this->m_value > other; }

			




	
	
	
		
 
	inline constexpr bool operator >= (const int other) const { return this->m_value >= other; }

			




	
	
	
		
 
	inline constexpr bool operator <  (const int other) const { return !(*this >= other); }

			




	
	
	
		
 
	inline constexpr bool operator <= (const int other) const { return !(*this > other); }

			




	
	
	
		
 

			




	
	
	
		
 
	inline operator int64 () const { return this->m_value; }

			




	
	
	
		
 
	inline constexpr operator int64 () const { return this->m_value; }

			




	
	
	
		
 
};

			




	
	
	
		
 

			




	
	
	
		
 
/* Sometimes we got int64 operator OverflowSafeInt instead of vice versa. Handle that properly */

			




	
	
	
		
 
template <class T> inline OverflowSafeInt<T> operator + (int64 a, OverflowSafeInt<T> b) { return b + a; }

			




	
	
	
		
 
template <class T> inline OverflowSafeInt<T> operator - (int64 a, OverflowSafeInt<T> b) { return -b + a; }

			




	
	
	
		
 
template <class T> inline OverflowSafeInt<T> operator * (int64 a, OverflowSafeInt<T> b) { return b * a; }

			




	
	
	
		
 
template <class T> inline OverflowSafeInt<T> operator / (int64 a, OverflowSafeInt<T> b) { return (OverflowSafeInt<T>)a / (int)b; }

			




	
	
	
		
 

			




	
	
	
		
 
/* Sometimes we got int operator OverflowSafeInt instead of vice versa. Handle that properly */

			




	
	
	
		
 
template <class T> inline OverflowSafeInt<T> operator + (int   a, OverflowSafeInt<T> b) { return b + a; }

			




	
	
	
		
 
template <class T> inline OverflowSafeInt<T> operator - (int   a, OverflowSafeInt<T> b) { return -b + a; }

			




	
	
	
		
 
template <class T> inline OverflowSafeInt<T> operator * (int   a, OverflowSafeInt<T> b) { return b * a; }

			




	
	
	
		
 
template <class T> inline OverflowSafeInt<T> operator / (int   a, OverflowSafeInt<T> b) { return (OverflowSafeInt<T>)a / (int)b; }

			




	
	
	
		
 
/* Sometimes we got int64 operator OverflowSafeInt instead of vice versa. Handle that properly. */

			




	
	
	
		
 
template <class T> inline constexpr OverflowSafeInt<T> operator + (const int64 a, const OverflowSafeInt<T> b) { return b + a; }

			




	
	
	
		
 
template <class T> inline constexpr OverflowSafeInt<T> operator - (const int64 a, const OverflowSafeInt<T> b) { return -b + a; }

			




	
	
	
		
 
template <class T> inline constexpr OverflowSafeInt<T> operator * (const int64 a, const OverflowSafeInt<T> b) { return b * a; }

			




	
	
	
		
 
template <class T> inline constexpr OverflowSafeInt<T> operator / (const int64 a, const OverflowSafeInt<T> b) { return (OverflowSafeInt<T>)a / (int)b; }

			




	
	
	
		
 

			




	
	
	
		
 
/* Sometimes we got uint operator OverflowSafeInt instead of vice versa. Handle that properly */

			




	
	
	
		
 
template <class T> inline OverflowSafeInt<T> operator + (uint  a, OverflowSafeInt<T> b) { return b + a; }

			




	
	
	
		
 
template <class T> inline OverflowSafeInt<T> operator - (uint  a, OverflowSafeInt<T> b) { return -b + a; }

			




	
	
	
		
 
template <class T> inline OverflowSafeInt<T> operator * (uint  a, OverflowSafeInt<T> b) { return b * a; }

			




	
	
	
		
 
template <class T> inline OverflowSafeInt<T> operator / (uint  a, OverflowSafeInt<T> b) { return (OverflowSafeInt<T>)a / (int)b; }

			




	
	
	
		
 
/* Sometimes we got int operator OverflowSafeInt instead of vice versa. Handle that properly. */

			




	
	
	
		
 
template <class T> inline constexpr OverflowSafeInt<T> operator + (const int   a, const OverflowSafeInt<T> b) { return b + a; }

			




	
	
	
		
 
template <class T> inline constexpr OverflowSafeInt<T> operator - (const int   a, const OverflowSafeInt<T> b) { return -b + a; }

			




	
	
	
		
 
template <class T> inline constexpr OverflowSafeInt<T> operator * (const int   a, const OverflowSafeInt<T> b) { return b * a; }

			




	
	
	
		
 
template <class T> inline constexpr OverflowSafeInt<T> operator / (const int   a, const OverflowSafeInt<T> b) { return (OverflowSafeInt<T>)a / (int)b; }

			




	
	
	
		
 

			




	
	
	
		
 
/* Sometimes we got byte operator OverflowSafeInt instead of vice versa. Handle that properly */

			




	
	
	
		
 
template <class T> inline OverflowSafeInt<T> operator + (byte  a, OverflowSafeInt<T> b) { return b + (uint)a; }

			




	
	
	
		
 
template <class T> inline OverflowSafeInt<T> operator - (byte  a, OverflowSafeInt<T> b) { return -b + (uint)a; }

			




	
	
	
		
 
template <class T> inline OverflowSafeInt<T> operator * (byte  a, OverflowSafeInt<T> b) { return b * (uint)a; }

			




	
	
	
		
 
template <class T> inline OverflowSafeInt<T> operator / (byte  a, OverflowSafeInt<T> b) { return (OverflowSafeInt<T>)a / (int)b; }

			




	
	
	
		
 
/* Sometimes we got uint operator OverflowSafeInt instead of vice versa. Handle that properly. */

			




	
	
	
		
 
template <class T> inline constexpr OverflowSafeInt<T> operator + (const uint  a, const OverflowSafeInt<T> b) { return b + a; }

			




	
	
	
		
 
template <class T> inline constexpr OverflowSafeInt<T> operator - (const uint  a, const OverflowSafeInt<T> b) { return -b + a; }

			




	
	
	
		
 
template <class T> inline constexpr OverflowSafeInt<T> operator * (const uint  a, const OverflowSafeInt<T> b) { return b * a; }

			




	
	
	
		
 
template <class T> inline constexpr OverflowSafeInt<T> operator / (const uint  a, const OverflowSafeInt<T> b) { return (OverflowSafeInt<T>)a / (int)b; }

			




	
	
	
		
 

			




	
	
	
		
 
/* Sometimes we got byte operator OverflowSafeInt instead of vice versa. Handle that properly. */

			




	
	
	
		
 
template <class T> inline constexpr OverflowSafeInt<T> operator + (const byte  a, const OverflowSafeInt<T> b) { return b + (uint)a; }

			




	
	
	
		
 
template <class T> inline constexpr OverflowSafeInt<T> operator - (const byte  a, const OverflowSafeInt<T> b) { return -b + (uint)a; }

			




	
	
	
		
 
template <class T> inline constexpr OverflowSafeInt<T> operator * (const byte  a, const OverflowSafeInt<T> b) { return b * (uint)a; }

			




	
	
	
		
 
template <class T> inline constexpr OverflowSafeInt<T> operator / (const byte  a, const OverflowSafeInt<T> b) { return (OverflowSafeInt<T>)a / (int)b; }

			




	
	
	
		
 

			




	
	
	
		
 
typedef OverflowSafeInt<int64> OverflowSafeInt64;

			




	
	
	
		
 
typedef OverflowSafeInt<int32> OverflowSafeInt32;

			




	
	
	
		
 

			




	
	
	
		
 
/* Some basic "unit tests". Also has the bonus of confirming that constexpr is working. */

			




	
	
	
		
 
static_assert(OverflowSafeInt32(INT32_MIN) - 1 == OverflowSafeInt32(INT32_MIN));

			




	
	
	
		
 
static_assert(OverflowSafeInt32(INT32_MAX) + 1 == OverflowSafeInt32(INT32_MAX));

			




	
	
	
		
 
static_assert(OverflowSafeInt32(INT32_MAX) * 2 == OverflowSafeInt32(INT32_MAX));

			




	
	
	
		
 
static_assert(OverflowSafeInt32(INT32_MIN) * 2 == OverflowSafeInt32(INT32_MIN));

			




	
	
	
		
 

			




	
	
	
		
 
#undef HAS_OVERFLOW_BUILTINS

			




	
	
	
		
 

			




	
	
	
		
 
#endif /* OVERFLOWSAFE_TYPE_HPP */

			




        

    



    


    



    



      

      





    
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