| 1 | /* Return classification value corresponding to argument. |
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| 2 | Copyright (C) 1997-2022 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 | |
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| 21 | #include <math_private.h> |
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| 22 | |
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| 23 | |
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| 24 | int |
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| 25 | __fpclassify (double x) |
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| 26 | { |
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| 27 | uint32_t hx, lx; |
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| 28 | int retval = FP_NORMAL; |
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| 29 | |
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| 30 | EXTRACT_WORDS (hx, lx, x); |
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| 31 | lx |= hx & 0xfffff; |
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| 32 | hx &= 0x7ff00000; |
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| 33 | if ((hx | lx) == 0) |
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| 34 | retval = FP_ZERO; |
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| 35 | else if (hx == 0) |
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| 36 | retval = FP_SUBNORMAL; |
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| 37 | else if (hx == 0x7ff00000) |
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| 38 | retval = lx != 0 ? FP_NAN : FP_INFINITE; |
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| 39 | |
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| 40 | return retval; |
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| 41 | } |
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| 42 | libm_hidden_def (__fpclassify) |
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| 43 | |
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