math.h

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#ifndef MSL_MATH_H
#define MSL_MATH_H
 
#include <platform.h>
 
#include <MetroTRK/intrinsics.h>
 
#define MSL_HI(x) *(int*) &x
#define MSL_LO(x) *(1 + (int*) &x)
 
#define M_PI 3.14159265358979323846
#define M_PI_2 (M_PI / 2)
#define M_PI_3 (M_PI / 3)
 
static float const deg_to_rad = M_PI / 180;
static float const rad_to_deg = 180 / M_PI;
 
#ifdef __MWERKS__
#pragma push
#pragma cplusplus on
#endif
 
#define FLT_EPSILON 1.00000001335e-10F
 
#ifdef __MWERKS__
#pragma pop
#endif
 
enum FloatType {
    FP_NAN = 1,
    FP_INFINITE = 2,
    FP_ZERO = 3,
    FP_NORMAL = 4,
    FP_SUBNORMAL = 5
};
 
static inline s32 __fpclassifyf(float x)
{
    const s32 exp_mask = 0b01111111100000000000000000000000; // = 0x7F800000
    const s32 mantissa_mask =
        0b00000000011111111111111111111111; // = 0x007fffff
    switch ((*(s32*) &x) & exp_mask) {
    case exp_mask:
        return ((*(s32*) &x) & mantissa_mask) ? FP_NAN : FP_INFINITE;
    case 0:
        return ((*(s32*) &x) & mantissa_mask) ? FP_SUBNORMAL : FP_ZERO;
    default:
        return FP_NORMAL;
    }
}
 
extern int __HI(double);
extern int __LO(double);
 
static inline s32 __fpclassifyd(double x)
{
    switch (__HI(x) & 0x7ff00000) {
    case 0x7ff00000:
        return ((__HI(x) & 0x000fffff) || (__LO(x) & 0xffffffff))
                   ? FP_NAN
                   : FP_INFINITE;
    case 0:
        return ((__HI(x) & 0x000fffff) || (__LO(x) & 0xffffffff))
                   ? FP_SUBNORMAL
                   : FP_ZERO;
    default:
        return FP_NORMAL;
    }
}
 
#define fpclassify(x)                                                         \
    ((sizeof(x) == sizeof(float)) ? __fpclassifyf((float) (x))                \
                                  : __fpclassifyd((double) (x)))
 
#define ABS(x) ((x) < 0 ? -(x) : (x))
 
static inline f32 fabs_inline(f32 x)
{
    if (x < 0) {
        return -x;
    } else {
        return x;
    }
}
 
static inline double fabs(double f)
{
    return __fabs(f);
}
 
double frexp(double x, int* exponent);
float fabsf__Ff(float);
float tanf(float x);
float cos__Ff(float x);
float sin__Ff(float x);
float cosf(float x);
float sinf(float x);
void __sinit_trigf_c(void);
float logf(float);
 
#endif