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/*@@
@file Math.c
@date 2012-10-17
@author Erik Schnetter
@desc
Miscellaneous math routines, providing fallback C
implementations for broken C++ compilers, and providing
dummy implementations for broken C compilers.
@enddesc
@@*/
#include <math.h>
#include <stdint.h>
#include <string.h>
#include <cctk_Config.h>
#include <cctk_Math.h>
double CCTK_copysign(double x, double y)
{
#ifdef HAVE_COPYSIGN
return copysign(x, y);
#else
return y >= 0.0 ? fabs(x) : -fabs(x);
#endif
}
double CCTK_FNAME(CCTK_copysign)(double *x, double *y);
double CCTK_FNAME(CCTK_copysign)(double *x, double *y)
{
return CCTK_copysign(*x, *y);
}
int CCTK_fpclassify(double x)
{
#ifdef HAVE_FPCLASSIFY
return fpclassify(x);
#else
return 0; /* don't know what else to return */
#endif
}
int CCTK_FNAME(CCTK_fpclassify)(double *x);
int CCTK_FNAME(CCTK_fpclassify)(double *x)
{
return CCTK_fpclassify(*x);
}
int CCTK_isfinite(double x)
{
#ifdef HAVE_ISFINITE
return isfinite(x);
#else
return 1; /* default */
#endif
}
int CCTK_FNAME(CCTK_isfinite)(double *x);
int CCTK_FNAME(CCTK_isfinite)(double *x)
{
return CCTK_isfinite(*x);
}
int CCTK_isinf(double x)
{
#ifdef HAVE_ISINF
return isinf(x);
#else
return 0; /* default */
#endif
}
int CCTK_FNAME(CCTK_isinf)(double *x);
int CCTK_FNAME(CCTK_isinf)(double *x)
{
return CCTK_isinf(*x);
}
int CCTK_isnan(double x)
{
#ifdef HAVE_ISNAN
return isnan(x);
#else
return 0; /* default */
#endif
}
int CCTK_FNAME(CCTK_isnan)(double *x);
int CCTK_FNAME(CCTK_isnan)(double *x)
{
return CCTK_isnan(*x);
}
int CCTK_isnormal(double x)
{
#ifdef HAVE_ISNORMAL
return isnormal(x);
#else
return 1; /* default */
#endif
}
int CCTK_FNAME(CCTK_isnormal)(double *x);
int CCTK_FNAME(CCTK_isnormal)(double *x)
{
return CCTK_isnormal(*x);
}
int CCTK_signbit(double x)
{
#ifdef HAVE_SIGNBIT
return signbit(x);
#else
return x < 0.0;
#endif
}
int CCTK_FNAME(CCTK_signbit)(double *x);
int CCTK_FNAME(CCTK_signbit)(double *x)
{
return CCTK_signbit(*x);
}
int CCTK_IEEE_isfinite(double x)
{
uint64_t u;
memcpy(&u, &x, sizeof u);
uint64_t e = (u & UINT64_C(0x7ff0000000000000)) >> 52;
return e != UINT64_C(0x7ff);
}
int CCTK_FNAME(CCTK_IEEE_isfinite)(double *x);
int CCTK_FNAME(CCTK_IEEE_isfinite)(double *x)
{
return CCTK_IEEE_isfinite(*x);
}
int CCTK_IEEE_isinf(double x)
{
uint64_t u;
memcpy(&u, &x, sizeof u);
uint64_t e = (u & UINT64_C(0x7ff0000000000000)) >> 52;
uint64_t m = u & UINT64_C(0x000fffffffffffff);
return e == UINT64_C(0x7ff) && m == 0;
}
int CCTK_FNAME(CCTK_IEEE_isinf)(double *x);
int CCTK_FNAME(CCTK_IEEE_isinf)(double *x)
{
return CCTK_IEEE_isinf(*x);
}
int CCTK_IEEE_isnan(double x)
{
uint64_t u;
memcpy(&u, &x, sizeof u);
uint64_t e = (u & UINT64_C(0x7ff0000000000000)) >> 52;
uint64_t m = u & UINT64_C(0x000fffffffffffff);
return e == UINT64_C(0x7ff) && m != 0;
}
int CCTK_FNAME(CCTK_IEEE_isnan)(double *x);
int CCTK_FNAME(CCTK_IEEE_isnan)(double *x)
{
return CCTK_IEEE_isnan(*x);
}
int CCTK_IEEE_isnormal(double x)
{
uint64_t u;
memcpy(&u, &x, sizeof u);
uint64_t e = (u & UINT64_C(0x7ff0000000000000)) >> 52;
return e != 0 && e != UINT64_C(0x7ff);
}
int CCTK_FNAME(CCTK_IEEE_isnormal)(double *x);
int CCTK_FNAME(CCTK_IEEE_isnormal)(double *x)
{
return CCTK_IEEE_isnormal(*x);
}
int CCTK_IEEE_signbit(double x)
{
uint64_t u;
memcpy(&u, &x, sizeof u);
uint64_t s = (u & UINT64_C(0x8000000000000000)) >> 63;
return s;
}
int CCTK_FNAME(CCTK_IEEE_signbit)(double *x);
int CCTK_FNAME(CCTK_IEEE_signbit)(double *x)
{
return CCTK_IEEE_signbit(*x);
}
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