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/* s_rintf.c -- float version of s_rint.c.
* Conversion to float by Ian Lance Taylor, Cygnus Support, ian@cygnus.com.
*/
/*
* ====================================================
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
*
* Developed at SunPro, a Sun Microsystems, Inc. business.
* Permission to use, copy, modify, and distribute this
* software is freely granted, provided that this notice
* is preserved.
* ====================================================
*/
#define NO_MATH_REDIRECT
#include <math.h>
#include <math_private.h>
#include <libm-alias-float.h>
#include <math-use-builtins.h>
float
__rintf (float x)
{
#if USE_RINTF_BUILTIN
return __builtin_rintf (x);
#else
/* Use generic implementation. */
static const float
TWO23[2] = {
8.3886080000e+06, /* 0x4b000000 */
-8.3886080000e+06, /* 0xcb000000 */
};
int32_t i0, j0, sx;
float w, t;
GET_FLOAT_WORD (i0, x);
sx = (i0 >> 31) & 1;
j0 = ((i0 >> 23) & 0xff) - 0x7f;
if (j0 < 23)
{
if(j0 < 0)
{
w = TWO23[sx] + x;
t = w - TWO23[sx];
GET_FLOAT_WORD (i0, t);
SET_FLOAT_WORD (t, (i0 & 0x7fffffff) | (sx << 31));
return t;
}
}
else
{
if (j0 == 0x80)
return x + x; /* inf or NaN */
else
return x; /* x is integral */
}
w = TWO23[sx] + x;
return w - TWO23[sx];
#endif /* ! USE_RINTF_BUILTIN */
}
#ifndef __rintf
libm_alias_float (__rint, rint)
#endif
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