| 1 | /* Set NaN payload. flt-32 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-float.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 0x7f |
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| 27 | #define PAYLOAD_DIG 22 |
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| 28 | #define EXPLICIT_MANT_DIG 23 |
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| 29 | |
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| 30 | int |
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| 31 | FUNC (float *x, float payload) |
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| 32 | { |
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| 33 | uint32_t ix; |
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| 34 | GET_FLOAT_WORD (ix, payload); |
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| 35 | int exponent = ix >> EXPLICIT_MANT_DIG; |
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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 && ix == 0)) |
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| 40 | || (ix & ((1U << (BIAS + EXPLICIT_MANT_DIG - exponent)) - 1)) != 0) |
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| 41 | { |
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| 42 | SET_FLOAT_WORD (*x, 0); |
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| 43 | return 1; |
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| 44 | } |
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| 45 | if (ix != 0) |
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| 46 | { |
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| 47 | ix &= (1U << EXPLICIT_MANT_DIG) - 1; |
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| 48 | ix |= 1U << EXPLICIT_MANT_DIG; |
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| 49 | ix >>= BIAS + EXPLICIT_MANT_DIG - exponent; |
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| 50 | } |
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| 51 | ix |= 0x7f800000 | (SET_HIGH_BIT ? 0x400000 : 0); |
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| 52 | SET_FLOAT_WORD (*x, ix); |
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| 53 | return 0; |
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| 54 | } |
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| 55 | |
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