| 1 | /* Total order operation on absolute values. ldbl-128ibm 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 <nan-high-order-bit.h> |
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| 22 | #include <stdint.h> |
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| 23 | #include <shlib-compat.h> |
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| 24 | |
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| 25 | int |
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| 26 | __totalordermagl (const long double *x, const long double *y) |
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| 27 | { |
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| 28 | double xhi, xlo, yhi, ylo; |
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| 29 | int64_t hx, hy, lx, ly; |
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| 30 | |
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| 31 | ldbl_unpack (*x, &xhi, &xlo); |
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| 32 | EXTRACT_WORDS64 (hx, xhi); |
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| 33 | ldbl_unpack (*y, &yhi, &ylo); |
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| 34 | EXTRACT_WORDS64 (hy, yhi); |
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| 35 | #if HIGH_ORDER_BIT_IS_SET_FOR_SNAN |
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| 36 | # error not implemented |
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| 37 | #endif |
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| 38 | uint64_t x_sign = hx & 0x8000000000000000ULL; |
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| 39 | uint64_t y_sign = hy & 0x8000000000000000ULL; |
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| 40 | hx ^= x_sign; |
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| 41 | hy ^= y_sign; |
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| 42 | if (hx < hy) |
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| 43 | return 1; |
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| 44 | else if (hx > hy) |
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| 45 | return 0; |
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| 46 | |
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| 47 | /* The high doubles are identical. If they are NaNs or both the low |
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| 48 | parts are zero, the low parts are not significant (and if they |
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| 49 | are infinities, both the low parts must be zero). */ |
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| 50 | if (hx >= 0x7ff0000000000000ULL) |
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| 51 | return 1; |
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| 52 | EXTRACT_WORDS64 (lx, xlo); |
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| 53 | EXTRACT_WORDS64 (ly, ylo); |
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| 54 | if (((lx | ly) & 0x7fffffffffffffffULL) == 0) |
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| 55 | return 1; |
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| 56 | lx ^= x_sign; |
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| 57 | ly ^= y_sign; |
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| 58 | |
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| 59 | /* Otherwise compare the low parts. */ |
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| 60 | uint64_t lx_sign = lx >> 63; |
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| 61 | uint64_t ly_sign = ly >> 63; |
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| 62 | lx ^= lx_sign >> 1; |
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| 63 | ly ^= ly_sign >> 1; |
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| 64 | return lx <= ly; |
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| 65 | } |
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| 66 | versioned_symbol (libm, __totalordermagl, totalordermagl, GLIBC_2_31); |
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| 67 | #if SHLIB_COMPAT (libm, GLIBC_2_25, GLIBC_2_31) |
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| 68 | int |
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| 69 | attribute_compat_text_section |
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| 70 | __totalordermag_compatl (long double x, long double y) |
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| 71 | { |
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| 72 | return __totalordermagl (&x, &y); |
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| 73 | } |
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| 74 | compat_symbol (libm, __totalordermag_compatl, totalordermagl, GLIBC_2_25); |
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| 75 | #endif |
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| 76 | |
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