source: src/prelude/builtins.c@ a1edafa

// 
// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
// 
// builtins.c -- 
// 
// Author           : Peter A. Buhr
// Created On       : Fri Jul 21 16:21:03 2017
// Last Modified By : Peter A. Buhr
// Last Modified On : Fri Jul 21 17:01:54 2017
// Update Count     : 11
// 

// exception implementation

typedef unsigned long long __cfaabi_exception_type_t;

#include "../libcfa/exception.h"

// exponentiation operator implementation

extern "C" {
        float powf( float x, float y );
        double pow( double x, double y );
        long double powl( long double x, long double y );
        float _Complex cpowf( float _Complex x, _Complex float z );
        double _Complex cpow( double _Complex x, _Complex double z );
        long double _Complex cpowl( long double _Complex x, _Complex long double z );
} // extern "C"

static inline float ?\?( float x, float y ) { return powf( x, y ); }
static inline double ?\?( double x, double y ) { return pow( x, y ); }
static inline long double ?\?( long double x, long double y ) { return powl( x, y ); }
static inline float _Complex ?\?( float _Complex x, _Complex float y ) { return cpowf(x, y ); }
static inline double _Complex ?\?( double _Complex x, _Complex double y ) { return cpow( x, y ); }
static inline long double _Complex ?\?( long double _Complex x, _Complex long double y ) { return cpowl( x, y ); }

static inline long int ?\?( long int pe, unsigned long y ) { // disallow negative exponent
        if ( y == 0 ) return 1;                                                         // base case
    if ( pe == 2 ) return pe << (y - 1);                                // special case, positive shifting only
    typeof( pe ) po = 1;                                                                // accumulate odd product
    for ( ; y > 1; y >>= 1 ) {                                                  // squaring exponentiation, O(log2 y)
                if ( (y & 1) == 1 ) po *= pe;                                   // odd ?
                pe *= pe;
        } // while
    return pe * po;
} // ?\?

// FIX ME, cannot resolve the "T po = 1".

// static inline forall( otype T | { void ?{}( T * this, one_t ); T ?*?( T, T ); } )
// T ?\?( T pe, unsigned long y ) {
//     if ( y == 0 ) return 1;
//     T po = 1;
//     for ( ; y > 1; y >>= 1 ) {                                                       // squaring exponentiation, O(log2 y)
//              if ( (y & 1) == 1 ) po = po * pe;                               // odd ?
//              pe = pe * pe;
//     } // for
//     return pe * po;
// } // ?\?

// unsigned computation may be faster and larger
static inline unsigned long int ?\?( unsigned long int pe, unsigned long y ) { // disallow negative exponent
        if ( y == 0 ) return 1;                                                         // base case
    if ( pe == 2 ) return pe << (y - 1);                                // special case, positive shifting only
    typeof( pe ) po = 1;                                                                // accumulate odd product
    for ( ; y > 1; y >>= 1 ) {                                                  // squaring exponentiation, O(log2 y)
                if ( (y & 1) == 1 ) po *= pe;                                   // odd ?
                pe *= pe;
        } // while
    return pe * po;
} // ?\?

static inline double ?\?( long int x, signed long y ) { // allow negative exponent
    if ( y >=  0 ) return (double)(x \ (unsigned long int)y);
    else return 1.0 / x \ (unsigned int)(-y);
} // ?\?

static inline forall( otype T | { void ?{}( T * this, one_t ); T ?*?( T, T ); double ?/?( double, T ); } )
double ?\?( T x, signed long y ) {
    if ( y >=  0 ) return (double)(x \ (unsigned long int)y);
    else return 1.0 / x \ (unsigned int)(-y);
} // ?\?

static inline long int ?\=?( long int * x, unsigned long y ) { *x = *x \ y; return *x; }
static inline long int ?\=?( unsigned long int * x, unsigned long y ) { *x = *x \ y; return *x; }
static inline int ?\=?( int * x, unsigned long y ) { *x = *x \ y; return *x; }
static inline int ?\=?( unsigned int * x, unsigned long y ) { *x = *x \ y; return *x; }

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