| 1 | /* Set NaN payload. ldbl-96 version. |
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| 2 | Copyright (C) 2016-2022 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <math.h> |
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| 20 | #include <math_private.h> |
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| 21 | #include <libm-alias-ldouble.h> |
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| 22 | #include <nan-high-order-bit.h> |
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| 23 | #include <stdint.h> |
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| 24 | |
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| 25 | #define SET_HIGH_BIT (HIGH_ORDER_BIT_IS_SET_FOR_SNAN ? SIG : !SIG) |
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| 26 | #define BIAS 0x3fff |
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| 27 | #define PAYLOAD_DIG 62 |
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| 28 | #define EXPLICIT_MANT_DIG 63 |
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| 29 | |
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| 30 | int |
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| 31 | FUNC (long double *x, long double payload) |
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| 32 | { |
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| 33 | uint32_t hx, lx; |
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| 34 | uint16_t exponent; |
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| 35 | GET_LDOUBLE_WORDS (exponent, hx, lx, payload); |
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| 36 | /* Test if argument is (a) negative or too large; (b) too small, |
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| 37 | except for 0 when allowed; (c) not an integer. */ |
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| 38 | if (exponent >= BIAS + PAYLOAD_DIG |
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| 39 | || (exponent < BIAS && !(SET_HIGH_BIT |
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| 40 | && exponent == 0 && hx == 0 && lx == 0))) |
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| 41 | { |
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| 42 | SET_LDOUBLE_WORDS (*x, 0, 0, 0); |
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| 43 | return 1; |
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| 44 | } |
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| 45 | int shift = BIAS + EXPLICIT_MANT_DIG - exponent; |
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| 46 | if (shift < 32 |
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| 47 | ? (lx & ((1U << shift) - 1)) != 0 |
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| 48 | : (lx != 0 || (hx & ((1U << (shift - 32)) - 1)) != 0)) |
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| 49 | { |
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| 50 | SET_LDOUBLE_WORDS (*x, 0, 0, 0); |
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| 51 | return 1; |
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| 52 | } |
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| 53 | if (exponent != 0) |
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| 54 | { |
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| 55 | if (shift >= 32) |
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| 56 | { |
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| 57 | lx = hx >> (shift - 32); |
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| 58 | hx = 0; |
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| 59 | } |
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| 60 | else if (shift != 0) |
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| 61 | { |
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| 62 | lx = (lx >> shift) | (hx << (32 - shift)); |
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| 63 | hx >>= shift; |
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| 64 | } |
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| 65 | } |
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| 66 | hx |= 0x80000000 | (SET_HIGH_BIT ? 0x40000000 : 0); |
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| 67 | SET_LDOUBLE_WORDS (*x, 0x7fff, hx, lx); |
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| 68 | return 0; |
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| 69 | } |
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| 70 | |
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