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This commit is contained in:
Justine Tunney 2020-06-15 07:18:57 -07:00
commit c91b3c5006
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28
libc/math/rintf.c Normal file
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#include "libc/math/math.h"
#if FLT_EVAL_METHOD==0
#define EPS FLT_EPSILON
#elif FLT_EVAL_METHOD==1
#define EPS DBL_EPSILON
#elif FLT_EVAL_METHOD==2
#define EPS LDBL_EPSILON
#endif
static const float_t toint = 1/EPS;
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 = x - toint + toint;
else
y = x + toint - toint;
if (y == 0)
return s ? -0.0f : 0.0f;
return y;
}