| /* Set NaN payload. dbl-64 version. |
| Copyright (C) 2016-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <math.h> |
| #include <math_private.h> |
| #include <libm-alias-double.h> |
| #include <nan-high-order-bit.h> |
| #include <stdint.h> |
| |
| #define SET_HIGH_BIT (HIGH_ORDER_BIT_IS_SET_FOR_SNAN ? SIG : !SIG) |
| #define BIAS 0x3ff |
| #define PAYLOAD_DIG 51 |
| #define EXPLICIT_MANT_DIG 52 |
| |
| int |
| FUNC (double *x, double payload) |
| { |
| uint32_t hx, lx; |
| EXTRACT_WORDS (hx, lx, payload); |
| int exponent = hx >> (EXPLICIT_MANT_DIG - 32); |
| /* Test if argument is (a) negative or too large; (b) too small, |
| except for 0 when allowed; (c) not an integer. */ |
| if (exponent >= BIAS + PAYLOAD_DIG |
| || (exponent < BIAS && !(SET_HIGH_BIT && hx == 0 && lx == 0))) |
| { |
| INSERT_WORDS (*x, 0, 0); |
| return 1; |
| } |
| int shift = BIAS + EXPLICIT_MANT_DIG - exponent; |
| if (shift < 32 |
| ? (lx & ((1U << shift) - 1)) != 0 |
| : (lx != 0 || (hx & ((1U << (shift - 32)) - 1)) != 0)) |
| { |
| INSERT_WORDS (*x, 0, 0); |
| return 1; |
| } |
| if (exponent != 0) |
| { |
| hx &= (1U << (EXPLICIT_MANT_DIG - 32)) - 1; |
| hx |= 1U << (EXPLICIT_MANT_DIG - 32); |
| if (shift >= 32) |
| { |
| lx = hx >> (shift - 32); |
| hx = 0; |
| } |
| else if (shift != 0) |
| { |
| lx = (lx >> shift) | (hx << (32 - shift)); |
| hx >>= shift; |
| } |
| } |
| hx |= 0x7ff00000 | (SET_HIGH_BIT ? 0x80000 : 0); |
| INSERT_WORDS (*x, hx, lx); |
| return 0; |
| } |