half_float::detail::f31 Struct Reference

Class for 1.31 unsigned floating-point computation. More...

#include <half.hpp>

Public Member Functions
HALF_CONSTEXPR	f31 (uint32 mant, int e)
	f31 (unsigned int abs)

Public Attributes
uint32	m
	mantissa as 1.31. More...
int	exp
	exponent. More...

Friends
f31	operator+ (f31 a, f31 b)
f31	operator- (f31 a, f31 b)
f31	operator* (f31 a, f31 b)
f31	operator/ (f31 a, f31 b)

Detailed Description

Class for 1.31 unsigned floating-point computation.

Definition at line 4861 of file half.hpp.

Constructor & Destructor Documentation

f31() [1/2]

HALF_CONSTEXPR half_float::detail::f31::f31 ( uint32  mant, int  e  )

inline

Constructor.

Parameters

mant	mantissa as 1.31
e	exponent

Definition at line 4866 of file half.hpp.

        : m(mant),
          exp(e)
    {
    }
 

f31() [2/2]

half_float::detail::f31::f31 ( unsigned int  abs )

inline

Constructor.

Parameters

abs	unsigned half-precision value

Definition at line 4874 of file half.hpp.

        : exp(-15)
    {
        for (; abs < 0x400; abs <<= 1, --exp)
            ;
        m = static_cast<uint32>((abs & 0x3FF) | 0x400) << 21;
        exp += (abs >> 10);
    }
 

Friends And Related Function Documentation

operator*

f31 operator* ( f31  a, f31  b  )

friend

Multiplication operator.

Parameters

a	first operand
b	second operand

Returns

a * b

Definition at line 4916 of file half.hpp.

    {
        uint32 m = multiply64(a.m, b.m);
        int i = m >> 31;
        return f31(m << (1 - i), a.exp + b.exp + i);
    }
 

operator+

f31 operator+ ( f31  a, f31  b  )

friend

Addition operator.

Parameters

a	first operand
b	second operand

Returns

a + b

Definition at line 4887 of file half.hpp.

    {
        if (b.exp > a.exp)
            std::swap(a, b);
        int d = a.exp - b.exp;
        uint32 m = a.m + ((d < 32) ? (b.m >> d) : 0);
        int i = (m & 0xFFFFFFFF) < a.m;
        return f31(((m + i) >> i) | 0x80000000, a.exp + i);
    }
 

operator-

f31 operator- ( f31  a, f31  b  )

friend

Subtraction operator.

Parameters

a	first operand
b	second operand

Returns

a - b

Definition at line 4901 of file half.hpp.

    {
        int d = a.exp - b.exp, exp = a.exp;
        uint32 m = a.m - ((d < 32) ? (b.m >> d) : 0);
        if (!m)
            return f31(0, -32);
        for (; m < 0x80000000; m <<= 1, --exp)
            ;
        return f31(m, exp);
    }
 

operator/

f31 operator/ ( f31  a, f31  b  )

friend

Division operator.

Parameters

a	first operand
b	second operand

Returns

a / b

Definition at line 4927 of file half.hpp.

    {
        int i = a.m >= b.m, s;
        uint32 m = divide64((a.m + i) >> i, b.m, s);
        return f31(m, a.exp - b.exp + i - 1);
    }
 

Member Data Documentation

exp

int half_float::detail::f31::exp

exponent.

Definition at line 4935 of file half.hpp.

m

uint32 half_float::detail::f31::m

mantissa as 1.31.

Definition at line 4934 of file half.hpp.

---

The documentation for this struct was generated from the following file:

• half.hpp