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70 lines
2.1 KiB
C
70 lines
2.1 KiB
C
/* Set NaN payload. ldbl-96 version.
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Copyright (C) 2016-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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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 <nan-high-order-bit.h>
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#include <stdint.h>
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#define SET_HIGH_BIT (HIGH_ORDER_BIT_IS_SET_FOR_SNAN ? SIG : !SIG)
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#define BIAS 0x3fff
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#define PAYLOAD_DIG 62
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#define EXPLICIT_MANT_DIG 63
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int
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FUNC (long double *x, long double payload)
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{
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uint32_t hx, lx;
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uint16_t exponent;
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GET_LDOUBLE_WORDS (exponent, hx, lx, payload);
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/* Test if argument is (a) negative or too large; (b) too small,
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except for 0 when allowed; (c) not an integer. */
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if (exponent >= BIAS + PAYLOAD_DIG
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|| (exponent < BIAS && !(SET_HIGH_BIT
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&& exponent == 0 && hx == 0 && lx == 0)))
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{
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SET_LDOUBLE_WORDS (*x, 0, 0, 0);
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return 1;
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}
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int shift = BIAS + EXPLICIT_MANT_DIG - exponent;
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if (shift < 32
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? (lx & ((1U << shift) - 1)) != 0
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: (lx != 0 || (hx & ((1U << (shift - 32)) - 1)) != 0))
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{
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SET_LDOUBLE_WORDS (*x, 0, 0, 0);
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return 1;
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}
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if (exponent != 0)
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{
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if (shift >= 32)
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{
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lx = hx >> (shift - 32);
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hx = 0;
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}
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else if (shift != 0)
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{
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lx = (lx >> shift) | (hx << (32 - shift));
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hx >>= shift;
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}
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}
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hx |= 0x80000000 | (SET_HIGH_BIT ? 0x40000000 : 0);
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SET_LDOUBLE_WORDS (*x, 0x7fff, hx, lx);
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return 0;
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}
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