PPL  0.12.1
Public Member Functions | Public Attributes | Static Public Attributes
Parma_Polyhedra_Library::float_ieee754_half Struct Reference
C++ Language Interface

#include <Float.defs.hh>

List of all members.

Public Member Functions

int inf_sign () const
bool is_nan () const
int zero_sign () const
bool sign_bit () const
void negate ()
void dec ()
void inc ()
void set_max (bool negative)
void build (bool negative, mpz_t mantissa, int exponent)

Public Attributes

uint16_t word

Static Public Attributes

static const uint16_t SGN_MASK = 0x8000U
static const uint16_t EXP_MASK = 0xfc00U
static const uint16_t POS_INF = 0xfc00U
static const uint16_t NEG_INF = 0x7c00U
static const uint16_t POS_ZERO = 0x0000U
static const uint16_t NEG_ZERO = 0x8000U
static const unsigned int BASE = 2
static const unsigned int EXPONENT_BITS = 5
static const unsigned int MANTISSA_BITS = 10
static const int EXPONENT_MAX = (1 << (EXPONENT_BITS - 1)) - 1
static const int EXPONENT_BIAS = EXPONENT_MAX
static const int EXPONENT_MIN = -EXPONENT_MAX + 1
static const int EXPONENT_MIN_DENORM
static const Floating_Point_Format floating_point_format = IEEE754_HALF

Detailed Description

Definition at line 50 of file Float.defs.hh.

Member Function Documentation

void Parma_Polyhedra_Library::float_ieee754_half::build ( bool  negative,
mpz_t  mantissa,
int  exponent 
)
inline

Definition at line 84 of file Float.inlines.hh.

References EXPONENT_BIAS, EXPONENT_BITS, MANTISSA_BITS, PPL_ASSERT, SGN_MASK, and word.

                                                                     {
  word = static_cast<uint16_t>(mpz_get_ui(mantissa)
                               & ((1UL << MANTISSA_BITS) - 1));
  if (negative)
    word |= SGN_MASK;
  int exponent_repr = exponent + EXPONENT_BIAS;
  PPL_ASSERT(exponent_repr >= 0 && exponent_repr < (1 << EXPONENT_BITS));
  word |= static_cast<uint16_t>(exponent_repr) << MANTISSA_BITS;
}
void Parma_Polyhedra_Library::float_ieee754_half::dec ( )
inline

Definition at line 67 of file Float.inlines.hh.

References word.

                        {
  --word;
}
void Parma_Polyhedra_Library::float_ieee754_half::inc ( )
inline

Definition at line 72 of file Float.inlines.hh.

References word.

                        {
  ++word;
}
int Parma_Polyhedra_Library::float_ieee754_half::inf_sign ( ) const
inline

Definition at line 34 of file Float.inlines.hh.

References NEG_INF, POS_INF, and word.

                                   {
  if (word == NEG_INF)
    return -1;
  if (word == POS_INF)
    return 1;
  return 0;
}
bool Parma_Polyhedra_Library::float_ieee754_half::is_nan ( ) const
inline

Definition at line 43 of file Float.inlines.hh.

References POS_INF, SGN_MASK, and word.

                                 {
  return (word & ~SGN_MASK) > POS_INF;
}
void Parma_Polyhedra_Library::float_ieee754_half::negate ( )
inline

Definition at line 57 of file Float.inlines.hh.

References SGN_MASK, and word.

                           {
  word ^= SGN_MASK;
}
void Parma_Polyhedra_Library::float_ieee754_half::set_max ( bool  negative)
inline

Definition at line 77 of file Float.inlines.hh.

References SGN_MASK, and word.

                                         {
  word = 0x7bffU;
  if (negative)
    word |= SGN_MASK;
}
bool Parma_Polyhedra_Library::float_ieee754_half::sign_bit ( ) const
inline

Definition at line 62 of file Float.inlines.hh.

References SGN_MASK, and word.

                                   {
  return (word & SGN_MASK) != 0;
}
int Parma_Polyhedra_Library::float_ieee754_half::zero_sign ( ) const
inline

Definition at line 48 of file Float.inlines.hh.

References NEG_ZERO, POS_ZERO, and word.

                                    {
  if (word == NEG_ZERO)
    return -1;
  if (word == POS_ZERO)
    return 1;
  return 0;
}

Member Data Documentation

const unsigned int Parma_Polyhedra_Library::float_ieee754_half::BASE = 2
static

Definition at line 58 of file Float.defs.hh.

Referenced by Parma_Polyhedra_Library::compute_absolute_error(), and Parma_Polyhedra_Library::Linear_Form< C >::relative_error().

const uint16_t Parma_Polyhedra_Library::float_ieee754_half::EXP_MASK = 0xfc00U
static

Definition at line 53 of file Float.defs.hh.

const int Parma_Polyhedra_Library::float_ieee754_half::EXPONENT_BIAS = EXPONENT_MAX
static

Definition at line 62 of file Float.defs.hh.

Referenced by build(), and Parma_Polyhedra_Library::compute_absolute_error().

const unsigned int Parma_Polyhedra_Library::float_ieee754_half::EXPONENT_BITS = 5
static

Definition at line 59 of file Float.defs.hh.

Referenced by build().

const int Parma_Polyhedra_Library::float_ieee754_half::EXPONENT_MAX = (1 << (EXPONENT_BITS - 1)) - 1
static

Definition at line 61 of file Float.defs.hh.

const int Parma_Polyhedra_Library::float_ieee754_half::EXPONENT_MIN = -EXPONENT_MAX + 1
static

Definition at line 63 of file Float.defs.hh.

const int Parma_Polyhedra_Library::float_ieee754_half::EXPONENT_MIN_DENORM
static
Initial value:
 EXPONENT_MIN
                                        - static_cast<int>(MANTISSA_BITS)

Definition at line 64 of file Float.defs.hh.

const Floating_Point_Format Parma_Polyhedra_Library::float_ieee754_half::floating_point_format = IEEE754_HALF
static

Definition at line 66 of file Float.defs.hh.

const unsigned int Parma_Polyhedra_Library::float_ieee754_half::MANTISSA_BITS = 10
static

Definition at line 60 of file Float.defs.hh.

Referenced by build(), Parma_Polyhedra_Library::compute_absolute_error(), and Parma_Polyhedra_Library::Linear_Form< C >::relative_error().

const uint16_t Parma_Polyhedra_Library::float_ieee754_half::NEG_INF = 0x7c00U
static

Definition at line 55 of file Float.defs.hh.

Referenced by inf_sign().

const uint16_t Parma_Polyhedra_Library::float_ieee754_half::NEG_ZERO = 0x8000U
static

Definition at line 57 of file Float.defs.hh.

Referenced by zero_sign().

const uint16_t Parma_Polyhedra_Library::float_ieee754_half::POS_INF = 0xfc00U
static

Definition at line 54 of file Float.defs.hh.

Referenced by inf_sign(), and is_nan().

const uint16_t Parma_Polyhedra_Library::float_ieee754_half::POS_ZERO = 0x0000U
static

Definition at line 56 of file Float.defs.hh.

Referenced by zero_sign().

const uint16_t Parma_Polyhedra_Library::float_ieee754_half::SGN_MASK = 0x8000U
static

Definition at line 52 of file Float.defs.hh.

Referenced by build(), is_nan(), negate(), set_max(), and sign_bit().

uint16_t Parma_Polyhedra_Library::float_ieee754_half::word

Definition at line 51 of file Float.defs.hh.

Referenced by build(), dec(), inc(), inf_sign(), is_nan(), negate(), set_max(), sign_bit(), and zero_sign().

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