xref: /petsc/include/petscmath.h (revision d4161b4ae070c1d342339263d4b0f5afb9b9e637)

/*

      PETSc mathematics include file. Defines certain basic mathematical
    constants and functions for working with single, double, and quad precision
    floating point numbers as well as complex single and double.

    This file is included by petscsys.h and should not be used directly.

*/

#if !defined(__PETSCMATH_H)
#define __PETSCMATH_H
#include <math.h>

/*

     Defines operations that are different for complex and real numbers;
   note that one cannot mix the use of complex and real in the same
   PETSc program. All PETSc objects in one program are built around the object
   PetscScalar which is either always a real or a complex.

*/

#define PetscExpPassiveScalar(a) PetscExpScalar()
#if defined(PETSC_USE_REAL_SINGLE)
#define MPIU_REAL   MPI_FLOAT
typedef float PetscReal;
#define PetscSqrtReal(a)    sqrt(a)
#define PetscExpReal(a)     exp(a)
#define PetscLogReal(a)     log(a)
#define PetscSinReal(a)     sin(a)
#define PetscCosReal(a)     cos(a)
#define PetscAsinReal(a)    asin(a)
#define PetscAcosReal(a)    acos(a)
#define PetscPowReal(a,b)   pow(a,b)
#define PetscTGamma(a)      tgammaf(a)
#elif defined(PETSC_USE_REAL_DOUBLE)
#define MPIU_REAL   MPI_DOUBLE
typedef double PetscReal;
#define PetscSqrtReal(a)    sqrt(a)
#define PetscExpReal(a)     exp(a)
#define PetscLogReal(a)     log(a)
#define PetscSinReal(a)     sin(a)
#define PetscCosReal(a)     cos(a)
#define PetscAsinReal(a)    asin(a)
#define PetscAcosReal(a)    acos(a)
#define PetscPowReal(a,b)   pow(a,b)
#define PetscTGamma(a)      tgamma(a)
#elif defined(PETSC_USE_REAL___FLOAT128)
#if defined(__cplusplus)
extern "C" {
#endif
#include <quadmath.h>
#if defined(__cplusplus)
}
#endif
PETSC_EXTERN MPI_Datatype MPIU___FLOAT128 PetscAttrMPITypeTag(__float128);
#define MPIU_REAL MPIU___FLOAT128
typedef __float128 PetscReal;
#define PetscSqrtReal(a)    sqrtq(a)
#define PetscExpReal(a)     expq(a)
#define PetscLogReal(a)     logq(a)
#define PetscSinReal(a)     sinq(a)
#define PetscCosReal(a)     cosq(a)
#define PetscAsinReal(a)    asinq(a)
#define PetscAcosReal(a)    acosq(a)
#define PetscPowReal(a,b)   powq(a,b)
#define PetscTGamma(a)      tgammaq(a)
#endif /* PETSC_USE_REAL_* */

/*
    Complex number definitions
 */
#if defined(PETSC_CLANGUAGE_CXX) && defined(PETSC_HAVE_CXX_COMPLEX) && !defined(PETSC_USE_REAL___FLOAT128)
#if (defined(PETSC_USE_COMPLEX) && !defined(PETSC_SKIP_COMPLEX)) || defined(PETSC_DESIRE_COMPLEX)
#define PETSC_HAVE_COMPLEX 1
/* C++ support of complex number */
#if defined(PETSC_HAVE_CUSP)
#define complexlib cusp
#include <cusp/complex.h>
#else
#define complexlib std
#include <complex>
#endif

#define PetscRealPartComplex(a)      (a).real()
#define PetscImaginaryPartComplex(a) (a).imag()
#define PetscAbsComplex(a)           complexlib::abs(a)
#define PetscConjComplex(a)          complexlib::conj(a)
#define PetscSqrtComplex(a)          complexlib::sqrt(a)
#define PetscPowComplex(a,b)         complexlib::pow(a,b)
#define PetscExpComplex(a)           complexlib::exp(a)
#define PetscLogComplex(a)           complexlib::log(a)
#define PetscSinComplex(a)           complexlib::sin(a)
#define PetscCosComplex(a)           complexlib::cos(a)
#define PetscAsinComplex(a)          complexlib::asin(a)
#define PetscAcosComplex(a)          complexlib::acos(a)

#if defined(PETSC_USE_REAL_SINGLE)
typedef complexlib::complex<float> PetscComplex;
#elif defined(PETSC_USE_REAL_DOUBLE)
typedef complexlib::complex<double> PetscComplex;
#elif defined(PETSC_USE_REAL___FLOAT128)
typedef complexlib::complex<__float128> PetscComplex; /* Notstandard and not expected to work, use __complex128 */
#endif  /* PETSC_USE_REAL_ */
#endif  /* PETSC_USE_COMPLEX || PETSC_DESIRE_COMPLEX */

#elif defined(PETSC_CLANGUAGE_C) && defined(PETSC_HAVE_C99_COMPLEX)
/* Use C99 _Complex for the type. Do not include complex.h by default to define "complex" because of symbol conflicts in Hypre. */
/* Compilation units that can safely use complex should define PETSC_DESIRE_COMPLEX before including any headers */
#if (defined(PETSC_USE_COMPLEX) && !defined(PETSC_SKIP_COMPLEX)) || defined(PETSC_DESIRE_COMPLEX)
#define PETSC_HAVE_COMPLEX 1
#include <complex.h>

#if defined(PETSC_USE_REAL_SINGLE)
typedef float _Complex PetscComplex;

#define PetscRealPartComplex(a)      crealf(a)
#define PetscImaginaryPartComplex(a) cimagf(a)
#define PetscAbsComplex(a)           cabsf(a)
#define PetscConjComplex(a)          conjf(a)
#define PetscSqrtComplex(a)          csqrtf(a)
#define PetscPowComplex(a,b)         cpowf(a,b)
#define PetscExpComplex(a)           cexpf(a)
#define PetscLogComplex(a)           clogf(a)
#define PetscSinComplex(a)           csinf(a)
#define PetscCosComplex(a)           ccosf(a)
#define PetscAsinComplex(a)          casinf(a)
#define PetscAcosComplex(a)          cacosf(a)

#elif defined(PETSC_USE_REAL_DOUBLE)
typedef double _Complex PetscComplex;

#define PetscRealPartComplex(a)      creal(a)
#define PetscImaginaryPartComplex(a) cimag(a)
#define PetscAbsComplex(a)           cabs(a)
#define PetscConjComplex(a)          conj(a)
#define PetscSqrtComplex(a)          csqrt(a)
#define PetscPowComplex(a,b)         cpow(a,b)
#define PetscExpComplex(a)           cexp(a)
#define PetscLogComplex(a)           clog(a)
#define PetscSinComplex(a)           csin(a)
#define PetscCosComplex(a)           ccos(a)
#define PetscAsinComplex(a)          casin(a)
#define PetscAcosComplex(a)          cacos(a)

#elif defined(PETSC_USE_REAL___FLOAT128)
typedef __complex128 PetscComplex;
PETSC_EXTERN MPI_Datatype MPIU___COMPLEX128 PetscAttrMPITypeTag(__complex128);

#define PetscRealPartComplex(a)      crealq(a)
#define PetscImaginaryPartComplex(a) cimagq(a)
#define PetscAbsComplex(a)           cabsq(a)
#define PetscConjComplex(a)          conjq(a)
#define PetscSqrtComplex(a)          csqrtq(a)
#define PetscPowComplex(a,b)         cpowq(a,b)
#define PetscExpComplex(a)           cexpq(a)
#define PetscLogComplex(a)           clogq(a)
#define PetscSinComplex(a)           csinq(a)
#define PetscCosComplex(a)           ccosq(a)
#define PetscAsinComplex(a)          casinq(a)
#define PetscAcosComplex(a)          cacosq(a)
#endif /* PETSC_USE_REAL_* */
#elif (defined(PETSC_USE_COMPLEX) && !defined(PETSC_SKIP_COMPLEX))
#error "PETSc was configured --with-scalar-type=complex, but a language-appropriate complex library is not available"
#endif /* PETSC_USE_COMPLEX || PETSC_DESIRE_COMPLEX */
#endif /* (PETSC_CLANGUAGE_CXX && PETSC_HAVE_CXX_COMPLEX) else-if (PETSC_CLANGUAGE_C && PETSC_HAVE_C99_COMPLEX) */

#if defined(PETSC_HAVE_COMPLEX)
#if defined(PETSC_HAVE_MPI_C_DOUBLE_COMPLEX)
#define MPIU_C_DOUBLE_COMPLEX MPI_C_DOUBLE_COMPLEX
#define MPIU_C_COMPLEX MPI_C_COMPLEX
#else
# if defined(PETSC_CLANGUAGE_CXX) && defined(PETSC_HAVE_CXX_COMPLEX)
  typedef complexlib::complex<double> petsc_mpiu_c_double_complex;
  typedef complexlib::complex<float> petsc_mpiu_c_complex;
# elif defined(PETSC_CLANGUAGE_C) && defined(PETSC_HAVE_C99_COMPLEX)
  typedef double _Complex petsc_mpiu_c_double_complex;
  typedef float _Complex petsc_mpiu_c_complex;
# else
  typedef struct {double real,imag;} petsc_mpiu_c_double_complex;
  typedef struct {float real,imag;} petsc_mpiu_c_complex;
# endif
PETSC_EXTERN MPI_Datatype MPIU_C_DOUBLE_COMPLEX PetscAttrMPITypeTagLayoutCompatible(petsc_mpiu_c_double_complex);
PETSC_EXTERN MPI_Datatype MPIU_C_COMPLEX PetscAttrMPITypeTagLayoutCompatible(petsc_mpiu_c_complex);
#endif /* PETSC_HAVE_MPI_C_DOUBLE_COMPLEX */
#endif /* PETSC_HAVE_COMPLEX */

#if defined(PETSC_HAVE_COMPLEX)
#  if defined(PETSC_USE_REAL_SINGLE)
#    define MPIU_COMPLEX MPIU_C_COMPLEX
#  elif defined(PETSC_USE_REAL_DOUBLE)
#    define MPIU_COMPLEX MPIU_C_DOUBLE_COMPLEX
#  elif defined(PETSC_USE_REAL___FLOAT128)
#    define MPIU_COMPLEX MPIU___COMPLEX128
#  endif /* PETSC_USE_REAL_* */
#endif

#if (defined(PETSC_USE_COMPLEX) && !defined(PETSC_SKIP_COMPLEX))
typedef PetscComplex PetscScalar;
#define PetscRealPart(a)      PetscRealPartComplex(a)
#define PetscImaginaryPart(a) PetscImaginaryPartComplex(a)
#define PetscAbsScalar(a)     PetscAbsComplex(a)
#define PetscConj(a)          PetscConjComplex(a)
#define PetscSqrtScalar(a)    PetscSqrtComplex(a)
#define PetscPowScalar(a,b)   PetscPowComplex(a,b)
#define PetscExpScalar(a)     PetscExpComplex(a)
#define PetscLogScalar(a)     PetscLogComplex(a)
#define PetscSinScalar(a)     PetscSinComplex(a)
#define PetscCosScalar(a)     PetscCosComplex(a)
#define PetscAsinScalar(a)    PetscAsinComplex(a)
#define PetscAcosScalar(a)    PetscAcosComplex(a)

#define MPIU_SCALAR MPIU_COMPLEX

/*
    real number definitions
 */
#else /* PETSC_USE_COMPLEX */
typedef PetscReal PetscScalar;
#define MPIU_SCALAR MPIU_REAL

#define PetscRealPart(a)      (a)
#define PetscImaginaryPart(a) ((PetscReal)0.)
PETSC_STATIC_INLINE PetscReal PetscAbsScalar(PetscScalar a) {return a < 0.0 ? -a : a;}
#define PetscConj(a)          (a)
#if !defined(PETSC_USE_REAL___FLOAT128)
#define PetscSqrtScalar(a)    sqrt(a)
#define PetscPowScalar(a,b)   pow(a,b)
#define PetscExpScalar(a)     exp(a)
#define PetscLogScalar(a)     log(a)
#define PetscSinScalar(a)     sin(a)
#define PetscCosScalar(a)     cos(a)
#define PetscAsinScalar(a)    asin(a)
#define PetscAcosScalar(a)    acos(a)
#else /* PETSC_USE_REAL___FLOAT128 */
#define PetscSqrtScalar(a)    sqrtq(a)
#define PetscPowScalar(a,b)   powq(a,b)
#define PetscExpScalar(a)     expq(a)
#define PetscLogScalar(a)     logq(a)
#define PetscSinScalar(a)     sinq(a)
#define PetscCosScalar(a)     cosq(a)
#define PetscAsinScalar(a)    asinq(a)
#define PetscAcosScalar(a)    acosq(a)
#endif /* PETSC_USE_REAL___FLOAT128 */

#endif /* PETSC_USE_COMPLEX */

#define PetscSign(a) (((a) >= 0) ? ((a) == 0 ? 0 : 1) : -1)
#define PetscAbs(a)  (((a) >= 0) ? (a) : -(a))

/* --------------------------------------------------------------------------*/

/*
   Certain objects may be created using either single or double precision.
   This is currently not used.
*/
typedef enum { PETSC_SCALAR_DOUBLE,PETSC_SCALAR_SINGLE, PETSC_SCALAR_LONG_DOUBLE } PetscScalarPrecision;

#if defined(PETSC_HAVE_COMPLEX)
/* PETSC_i is the imaginary number, i */
PETSC_EXTERN PetscComplex PETSC_i;
#endif

/*MC
   PetscMin - Returns minimum of two numbers

   Synopsis:
   #include <petscmath.h>
   type PetscMin(type v1,type v2)

   Not Collective

   Input Parameter:
+  v1 - first value to find minimum of
-  v2 - second value to find minimum of

   Notes: type can be integer or floating point value

   Level: beginner

.seealso: PetscMin(), PetscClipInterval(), PetscAbsInt(), PetscAbsReal(), PetscSqr()

M*/
#define PetscMin(a,b)   (((a)<(b)) ?  (a) : (b))

/*MC
   PetscMax - Returns maxium of two numbers

   Synopsis:
   #include <petscmath.h>
   type max PetscMax(type v1,type v2)

   Not Collective

   Input Parameter:
+  v1 - first value to find maximum of
-  v2 - second value to find maximum of

   Notes: type can be integer or floating point value

   Level: beginner

.seealso: PetscMin(), PetscClipInterval(), PetscAbsInt(), PetscAbsReal(), PetscSqr()

M*/
#define PetscMax(a,b)   (((a)<(b)) ?  (b) : (a))

/*MC
   PetscClipInterval - Returns a number clipped to be within an interval

   Synopsis:
   #include <petscmath.h>
   type clip PetscClipInterval(type x,type a,type b)

   Not Collective

   Input Parameter:
+  x - value to use if within interval (a,b)
.  a - lower end of interval
-  b - upper end of interval

   Notes: type can be integer or floating point value

   Level: beginner

.seealso: PetscMin(), PetscMax(), PetscAbsInt(), PetscAbsReal(), PetscSqr()

M*/
#define PetscClipInterval(x,a,b)   (PetscMax((a),PetscMin((x),(b))))

/*MC
   PetscAbsInt - Returns the absolute value of an integer

   Synopsis:
   #include <petscmath.h>
   int abs PetscAbsInt(int v1)

   Not Collective

   Input Parameter:
.   v1 - the integer

   Level: beginner

.seealso: PetscMax(), PetscMin(), PetscAbsReal(), PetscSqr()

M*/
#define PetscAbsInt(a)  (((a)<0)   ? -(a) : (a))

/*MC
   PetscAbsReal - Returns the absolute value of an real number

   Synopsis:
   #include <petscmath.h>
   Real abs PetscAbsReal(PetscReal v1)

   Not Collective

   Input Parameter:
.   v1 - the double


   Level: beginner

.seealso: PetscMax(), PetscMin(), PetscAbsInt(), PetscSqr()

M*/
#define PetscAbsReal(a) (((a)<0)   ? -(a) : (a))

/*MC
   PetscSqr - Returns the square of a number

   Synopsis:
   #include <petscmath.h>
   type sqr PetscSqr(type v1)

   Not Collective

   Input Parameter:
.   v1 - the value

   Notes: type can be integer or floating point value

   Level: beginner

.seealso: PetscMax(), PetscMin(), PetscAbsInt(), PetscAbsReal()

M*/
#define PetscSqr(a)     ((a)*(a))

/* ----------------------------------------------------------------------------*/
/*
     Basic constants
*/
#if defined(PETSC_USE_REAL___FLOAT128)
#define PETSC_PI                 M_PIq
#elif defined(M_PI)
#define PETSC_PI                 M_PI
#else
#define PETSC_PI                 3.14159265358979323846264338327950288419716939937510582
#endif

#if !defined(PETSC_USE_64BIT_INDICES)
#define PETSC_MAX_INT            2147483647
#define PETSC_MIN_INT            (-PETSC_MAX_INT - 1)
#else
#define PETSC_MAX_INT            9223372036854775807L
#define PETSC_MIN_INT            (-PETSC_MAX_INT - 1)
#endif

#if defined(PETSC_USE_REAL_SINGLE)
#  define PETSC_MAX_REAL                3.40282346638528860e+38F
#  define PETSC_MIN_REAL                -PETSC_MAX_REAL
#  define PETSC_MACHINE_EPSILON         1.19209290e-07F
#  define PETSC_SQRT_MACHINE_EPSILON    3.45266983e-04F
#  define PETSC_SMALL                   1.e-5
#elif defined(PETSC_USE_REAL_DOUBLE)
#  define PETSC_MAX_REAL                1.7976931348623157e+308
#  define PETSC_MIN_REAL                -PETSC_MAX_REAL
#  define PETSC_MACHINE_EPSILON         2.2204460492503131e-16
#  define PETSC_SQRT_MACHINE_EPSILON    1.490116119384766e-08
#  define PETSC_SMALL                   1.e-10
#elif defined(PETSC_USE_REAL___FLOAT128)
#  define PETSC_MAX_REAL                FLT128_MAX
#  define PETSC_MIN_REAL                -FLT128_MAX
#  define PETSC_MACHINE_EPSILON         FLT128_EPSILON
#  define PETSC_SQRT_MACHINE_EPSILON    1.38777878078e-17
#  define PETSC_SMALL                   1.e-20
#endif

#define PETSC_INFINITY                PETSC_MAX_REAL/4.0
#define PETSC_NINFINITY              -PETSC_INFINITY

PETSC_EXTERN PetscErrorCode PetscIsInfOrNanScalar(PetscScalar);
PETSC_EXTERN PetscErrorCode PetscIsInfOrNanReal(PetscReal);
PETSC_EXTERN PetscBool PetscIsNormalScalar(PetscScalar);
PETSC_EXTERN PetscBool PetscIsNormalReal(PetscReal);

/* ----------------------------------------------------------------------------*/
#define PassiveReal   PetscReal
#define PassiveScalar PetscScalar

/*
    These macros are currently hardwired to match the regular data types, so there is no support for a different
    MatScalar from PetscScalar. We left the MatScalar in the source just in case we use it again.
 */
#define MPIU_MATSCALAR MPIU_SCALAR
typedef PetscScalar MatScalar;
typedef PetscReal MatReal;

struct petsc_mpiu_2scalar {PetscScalar a,b;};
PETSC_EXTERN MPI_Datatype MPIU_2SCALAR PetscAttrMPITypeTagLayoutCompatible(struct petsc_mpiu_2scalar);
#if defined(PETSC_USE_64BIT_INDICES) || !defined(MPI_2INT)
struct petsc_mpiu_2int {PetscInt a,b;};
PETSC_EXTERN MPI_Datatype MPIU_2INT PetscAttrMPITypeTagLayoutCompatible(struct petsc_mpiu_2int);
#else
#define MPIU_2INT MPI_2INT
#endif

PETSC_STATIC_INLINE PetscInt PetscPowInt(PetscInt base,PetscInt power) {
  PetscInt result = 1;
  while (power) {
    if (power & 1) result *= base;
    power >>= 1;
    base *= base;
  }
  return result;
}
PETSC_STATIC_INLINE PetscReal PetscPowRealInt(PetscReal base,PetscInt power) {
  PetscReal result = 1;
  if (power < 0) {
    power = -power;
    if (base != 0.0) base  = 1./base;
  }
  while (power) {
    if (power & 1) result *= base;
    power >>= 1;
    base *= base;
  }
  return result;
}

PETSC_STATIC_INLINE PetscScalar PetscPowScalarInt(PetscScalar base,PetscInt power) {
  PetscScalar result = 1;
  if (power < 0) {
    power = -power;
    if (base != 0.0) base  = 1./base;
  }
  while (power) {
    if (power & 1) result *= base;
    power >>= 1;
    base *= base;
  }
  return result;
}

#endif