101 lines
2.0 KiB
C
101 lines
2.0 KiB
C
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/* s_ceill.c -- long double version of s_ceil.c.
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*/
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/*
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* ====================================================
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* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
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*
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* Developed at SunPro, a Sun Microsystems, Inc. business.
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* Permission to use, copy, modify, and distribute this
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* software is freely granted, provided that this notice
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* is preserved.
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* ====================================================
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*/
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#if defined (LIBM_SCCS) && ! defined (lint)
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static char rcsid[] = "$NetBSD: $";
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#endif
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/*
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* ceill(x)
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* Return x rounded toward -inf to integral value
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* Method:
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* Bit twiddling.
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*/
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#define NO_MATH_REDIRECT
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#include <math.h>
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#include <math_private.h>
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#include <libm-alias-ldouble.h>
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#include <math-use-builtins.h>
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_Float128
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__ceill (_Float128 x)
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{
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#if USE_CEILL_BUILTIN
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return __builtin_ceill (x);
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#else
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/* Use generic implementation. */
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int64_t i0, i1, j0;
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uint64_t i, j;
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GET_LDOUBLE_WORDS64 (i0, i1, x);
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j0 = ((i0 >> 48) & 0x7fff) - 0x3fff;
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if (j0 < 48)
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{
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if (j0 < 0)
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{
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/* return 0 * sign (x) if |x| < 1 */
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if (i0 < 0)
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{
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i0 = 0x8000000000000000ULL;
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i1 = 0;
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}
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else if ((i0 | i1) != 0)
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{
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i0 = 0x3fff000000000000ULL;
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i1 = 0;
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}
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}
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else
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{
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i = (0x0000ffffffffffffULL) >> j0;
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if (((i0 & i) | i1) == 0)
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return x; /* x is integral */
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if (i0 > 0)
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i0 += (0x0001000000000000LL) >> j0;
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i0 &= (~i);
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i1 = 0;
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}
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}
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else if (j0 > 111)
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{
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if (j0 == 0x4000)
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return x + x; /* inf or NaN */
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else
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return x; /* x is integral */
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}
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else
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{
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i = -1ULL >> (j0 - 48);
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if ((i1 & i) == 0)
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return x; /* x is integral */
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if (i0 > 0)
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{
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if (j0 == 48)
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i0 += 1;
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else
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{
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j = i1 + (1LL << (112 - j0));
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if (j < i1)
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i0 += 1; /* got a carry */
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i1 = j;
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}
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}
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i1 &= (~i);
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}
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SET_LDOUBLE_WORDS64 (x, i0, i1);
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return x;
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#endif /* ! USE_CEILL_BUILTIN */
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}
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libm_alias_ldouble (__ceil, ceil)
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