| 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 | #include <math_ldbl_opt.h> |
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| 23 | |
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| 24 | /* |
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| 25 | * hx lx |
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| 26 | * +NaN 7ffn nnnn nnnn nnnn xxxx xxxx xxxx xxxx |
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| 27 | * -NaN fffn nnnn nnnn nnnn xxxx xxxx xxxx xxxx |
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| 28 | * +Inf 7ff0 0000 0000 0000 xxxx xxxx xxxx xxxx |
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| 29 | * -Inf fff0 0000 0000 0000 xxxx xxxx xxxx xxxx |
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| 30 | * +0 0000 0000 0000 0000 xxxx xxxx xxxx xxxx |
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| 31 | * -0 8000 0000 0000 0000 xxxx xxxx xxxx xxxx |
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| 32 | * +normal 0360 0000 0000 0000 0000 0000 0000 0000 (smallest) |
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| 33 | * -normal 8360 0000 0000 0000 0000 0000 0000 0000 (smallest) |
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| 34 | * +normal 7fef ffff ffff ffff 7c8f ffff ffff fffe (largest) |
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| 35 | * +normal ffef ffff ffff ffff fc8f ffff ffff fffe (largest) |
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| 36 | * +denorm 0360 0000 0000 0000 8000 0000 0000 0001 (largest) |
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| 37 | * -denorm 8360 0000 0000 0000 0000 0000 0000 0001 (largest) |
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| 38 | * +denorm 000n nnnn nnnn nnnn xxxx xxxx xxxx xxxx |
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| 39 | * -denorm 800n nnnn nnnn nnnn xxxx xxxx xxxx xxxx |
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| 40 | */ |
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| 41 | |
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| 42 | int |
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| 43 | ___fpclassifyl (long double x) |
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| 44 | { |
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| 45 | uint64_t hx, lx; |
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| 46 | int retval = FP_NORMAL; |
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| 47 | double xhi, xlo; |
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| 48 | |
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| 49 | ldbl_unpack (x, &xhi, &xlo); |
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| 50 | EXTRACT_WORDS64 (hx, xhi); |
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| 51 | if ((hx & 0x7ff0000000000000ULL) == 0x7ff0000000000000ULL) { |
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| 52 | /* +/-NaN or +/-Inf */ |
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| 53 | if (hx & 0x000fffffffffffffULL) { |
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| 54 | /* +/-NaN */ |
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| 55 | retval = FP_NAN; |
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| 56 | } else { |
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| 57 | retval = FP_INFINITE; |
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| 58 | } |
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| 59 | } else { |
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| 60 | /* +/-zero or +/- normal or +/- denormal */ |
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| 61 | if (hx & 0x7fffffffffffffffULL) { |
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| 62 | /* +/- normal or +/- denormal */ |
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| 63 | if ((hx & 0x7ff0000000000000ULL) > 0x0360000000000000ULL) { |
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| 64 | /* +/- normal */ |
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| 65 | retval = FP_NORMAL; |
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| 66 | } else { |
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| 67 | if ((hx & 0x7ff0000000000000ULL) == 0x0360000000000000ULL) { |
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| 68 | EXTRACT_WORDS64 (lx, xlo); |
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| 69 | if ((lx & 0x7fffffffffffffff) /* lower is non-zero */ |
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| 70 | && ((lx^hx) & 0x8000000000000000ULL)) { /* and sign differs */ |
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| 71 | /* +/- denormal */ |
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| 72 | retval = FP_SUBNORMAL; |
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| 73 | } else { |
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| 74 | /* +/- normal */ |
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| 75 | retval = FP_NORMAL; |
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| 76 | } |
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| 77 | } else { |
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| 78 | /* +/- denormal */ |
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| 79 | retval = FP_SUBNORMAL; |
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| 80 | } |
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| 81 | } |
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| 82 | } else { |
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| 83 | /* +/- zero */ |
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| 84 | retval = FP_ZERO; |
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| 85 | } |
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| 86 | } |
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| 87 | |
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| 88 | return retval; |
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| 89 | } |
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| 90 | long_double_symbol (libm, ___fpclassifyl, __fpclassifyl); |
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| 91 | #ifdef __LONG_DOUBLE_MATH_OPTIONAL |
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| 92 | libm_hidden_ver (___fpclassifyl, __fpclassifyl) |
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| 93 | #else |
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| 94 | libm_hidden_def (__fpclassifyl) |
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| 95 | #endif |
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| 96 | |
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