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/* s_ceill.c -- long double version of s_ceil.c.
*/
/*
* ====================================================
* 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.
* ====================================================
*/
#if defined (LIBM_SCCS) && ! defined (lint)
static char rcsid[] = "$NetBSD: $";
#endif
/*
* ceill(x)
* Return x rounded toward -inf to integral value
* Method:
* Bit twiddling.
*/
#define NO_MATH_REDIRECT
#include <math.h>
#include <math_private.h>
#include <libm-alias-ldouble.h>
#include <math-use-builtins.h>
_Float128
__ceill (_Float128 x)
{
#if USE_CEILL_BUILTIN
return __builtin_ceill (x);
#else
/* Use generic implementation. */
int64_t i0, i1, j0;
uint64_t i, j;
GET_LDOUBLE_WORDS64 (i0, i1, x);
j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
if (j0 < 48)
{
if (j0 < 0)
{
/* return 0 * sign (x) if |x| < 1 */
if (i0 < 0)
{
i0 = 0x8000000000000000ULL;
i1 = 0;
}
else if ((i0 | i1) != 0)
{
i0 = 0x3fff000000000000ULL;
i1 = 0;
}
}
else
{
i = (0x0000ffffffffffffULL) >> j0;
if (((i0 & i) | i1) == 0)
return x; /* x is integral */
if (i0 > 0)
i0 += (0x0001000000000000LL) >> j0;
i0 &= (~i);
i1 = 0;
}
}
else if (j0 > 111)
{
if (j0 == 0x4000)
return x + x; /* inf or NaN */
else
return x; /* x is integral */
}
else
{
i = -1ULL >> (j0 - 48);
if ((i1 & i) == 0)
return x; /* x is integral */
if (i0 > 0)
{
if (j0 == 48)
i0 += 1;
else
{
j = i1 + (1LL << (112 - j0));
if (j < i1)
i0 += 1; /* got a carry */
i1 = j;
}
}
i1 &= (~i);
}
SET_LDOUBLE_WORDS64 (x, i0, i1);
return x;
#endif /* ! USE_CEILL_BUILTIN */
}
libm_alias_ldouble (__ceil, ceil)
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