math: rewrite remainder functions (remainder, remquo, fmod, modf)

[musl] / src / math / rintf.c

#include <math.h>
#include <stdint.h>

float rintf(float x)
{
        union {float f; uint32_t i;} u = {x};
        int e = u.i>>23 & 0xff;
        int s = u.i>>31;
        float_t y;

        if (e >= 0x7f+23)
                return x;
        if (s)
                y = (float)(x - 0x1p23f) + 0x1p23f;
        else
                y = (float)(x + 0x1p23f) - 0x1p23f;
        if (y == 0)
                return s ? -0.0f : 0.0f;
        return y;
}