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circuitpython/lib/libm/nearbyintf.c

24 lines
455 B

// adapted from the rintf() function from musl-1.1.16
#include "libm.h"
float nearbyintf(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 = x - 0x1p23f + 0x1p23f;
else
y = x + 0x1p23f - 0x1p23f;
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wfloat-equal"
if (y == 0)
return s ? -0.0f : 0.0f;
#pragma GCC diagnostic pop
return y;
}