G4ExpConsts Namespace Reference

Data Structures
union	ieee754

Functions
G4double	uint642dp (uint64_t ll)
G4float	uint322sp (G4int x)
uint32_t	sp2uint32 (G4float x)
G4double	fpfloor (const G4double x)
G4float	fpfloor (const G4float x)

Variables
const G4double	EXP_LIMIT = 708
const G4double	PX1exp = 1.26177193074810590878E-4
const G4double	PX2exp = 3.02994407707441961300E-2
const G4double	PX3exp = 9.99999999999999999910E-1
const G4double	QX1exp = 3.00198505138664455042E-6
const G4double	QX2exp = 2.52448340349684104192E-3
const G4double	QX3exp = 2.27265548208155028766E-1
const G4double	QX4exp = 2.00000000000000000009E0
const G4double	LOG2E = 1.4426950408889634073599
const G4float	MAXLOGF = 88.72283905206835f
const G4float	MINLOGF = -88.f
const G4float	C1F = 0.693359375f
const G4float	C2F = -2.12194440e-4f
const G4float	PX1expf = 1.9875691500E-4f
const G4float	PX2expf =1.3981999507E-3f
const G4float	PX3expf =8.3334519073E-3f
const G4float	PX4expf =4.1665795894E-2f
const G4float	PX5expf =1.6666665459E-1f
const G4float	PX6expf =5.0000001201E-1f
const G4float	LOG2EF = 1.44269504088896341f

Function Documentation

G4double G4ExpConsts::fpfloor ( const G4double  x )

inline

A vectorisable floor implementation, not only triggered by fast-math. These functions do not distinguish between -0.0 and 0.0, so are not IEC6509 compliant for argument -0.0

Definition at line 154 of file G4Exp.hh.

References sp2uint32().

Referenced by G4Exp(), and G4Expf().

  {
    // no problem since exp is defined between -708 and 708. Int is enough for it!
    int32_t ret = int32_t (x);
    ret-=(sp2uint32(x)>>31);  
    return ret;
  }

G4float G4ExpConsts::fpfloor ( const G4float  x )

inline

A vectorisable floor implementation, not only triggered by fast-math. These functions do not distinguish between -0.0 and 0.0, so are not IEC6509 compliant for argument -0.0

Definition at line 168 of file G4Exp.hh.

References sp2uint32().

  {
    int32_t ret = int32_t (x);
    ret-=(sp2uint32(x)>>31);  
    return ret;
  }

uint32_t G4ExpConsts::sp2uint32 ( G4float  x )

inline

Definition at line 141 of file G4Exp.hh.

References G4ExpConsts::ieee754::f, G4ExpConsts::ieee754::i, and test::x.

Referenced by fpfloor().

  {
    ieee754 tmp;
    tmp.f[0]=x;
    return tmp.i[0];
  }

G4float G4ExpConsts::uint322sp ( G4int  x )

inline

Definition at line 131 of file G4Exp.hh.

References G4ExpConsts::ieee754::f, G4ExpConsts::ieee754::i, and test::x.

Referenced by G4Expf().

  {
    ieee754 tmp;
    tmp.i[0]=x;
    return tmp.f[0];
  }

G4double G4ExpConsts::uint642dp ( uint64_t  ll )

inline

Definition at line 121 of file G4Exp.hh.

References G4ExpConsts::ieee754::d, and G4ExpConsts::ieee754::ll.

Referenced by G4Exp().

  {
    ieee754 tmp;
    tmp.ll=ll;
    return tmp.d;
  }

Variable Documentation

const G4float G4ExpConsts::C1F = 0.693359375f

Definition at line 88 of file G4Exp.hh.

Referenced by G4Expf().

const G4float G4ExpConsts::C2F = -2.12194440e-4f

Definition at line 89 of file G4Exp.hh.

Referenced by G4Expf().

const G4double G4ExpConsts::EXP_LIMIT = 708

Definition at line 73 of file G4Exp.hh.

Referenced by G4Exp().

const G4double G4ExpConsts::LOG2E = 1.4426950408889634073599

Definition at line 83 of file G4Exp.hh.

Referenced by G4Exp().

const G4float G4ExpConsts::LOG2EF = 1.44269504088896341f

Definition at line 98 of file G4Exp.hh.

Referenced by G4Expf().

const G4float G4ExpConsts::MAXLOGF = 88.72283905206835f

Definition at line 85 of file G4Exp.hh.

Referenced by G4Expf().

const G4float G4ExpConsts::MINLOGF = -88.f

Definition at line 86 of file G4Exp.hh.

Referenced by G4Expf().

const G4double G4ExpConsts::PX1exp = 1.26177193074810590878E-4

Definition at line 75 of file G4Exp.hh.

Referenced by G4Exp().

const G4float G4ExpConsts::PX1expf = 1.9875691500E-4f

Definition at line 91 of file G4Exp.hh.

Referenced by G4Expf().

const G4double G4ExpConsts::PX2exp = 3.02994407707441961300E-2

Definition at line 76 of file G4Exp.hh.

Referenced by G4Exp().

const G4float G4ExpConsts::PX2expf =1.3981999507E-3f

Definition at line 92 of file G4Exp.hh.

Referenced by G4Expf().

const G4double G4ExpConsts::PX3exp = 9.99999999999999999910E-1

Definition at line 77 of file G4Exp.hh.

Referenced by G4Exp().

const G4float G4ExpConsts::PX3expf =8.3334519073E-3f

Definition at line 93 of file G4Exp.hh.

Referenced by G4Expf().

const G4float G4ExpConsts::PX4expf =4.1665795894E-2f

Definition at line 94 of file G4Exp.hh.

Referenced by G4Expf().

const G4float G4ExpConsts::PX5expf =1.6666665459E-1f

Definition at line 95 of file G4Exp.hh.

Referenced by G4Expf().

const G4float G4ExpConsts::PX6expf =5.0000001201E-1f

Definition at line 96 of file G4Exp.hh.

Referenced by G4Expf().

const G4double G4ExpConsts::QX1exp = 3.00198505138664455042E-6

Definition at line 78 of file G4Exp.hh.

Referenced by G4Exp().

const G4double G4ExpConsts::QX2exp = 2.52448340349684104192E-3

Definition at line 79 of file G4Exp.hh.

Referenced by G4Exp().

const G4double G4ExpConsts::QX3exp = 2.27265548208155028766E-1

Definition at line 80 of file G4Exp.hh.

Referenced by G4Exp().

const G4double G4ExpConsts::QX4exp = 2.00000000000000000009E0

Definition at line 81 of file G4Exp.hh.

Referenced by G4Exp().