| 1 | /* Total order operation. |
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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 <libm-alias-double.h> |
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| 23 | #include <stdint.h> |
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| 24 | #include <shlib-compat.h> |
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| 25 | #include <first-versions.h> |
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| 26 | |
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| 27 | int |
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| 28 | __totalorder (const double *x, const double *y) |
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| 29 | { |
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| 30 | int64_t ix, iy; |
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| 31 | EXTRACT_WORDS64 (ix, *x); |
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| 32 | EXTRACT_WORDS64 (iy, *y); |
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| 33 | #if HIGH_ORDER_BIT_IS_SET_FOR_SNAN |
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| 34 | /* For the preferred quiet NaN convention, this operation is a |
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| 35 | comparison of the representations of the arguments interpreted as |
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| 36 | sign-magnitude integers. If both arguments are NaNs, invert the |
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| 37 | quiet/signaling bit so comparing that way works. */ |
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| 38 | if ((ix & 0x7fffffffffffffffULL) > 0x7ff0000000000000ULL |
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| 39 | && (iy & 0x7fffffffffffffffULL) > 0x7ff0000000000000ULL) |
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| 40 | { |
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| 41 | ix ^= 0x0008000000000000ULL; |
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| 42 | iy ^= 0x0008000000000000ULL; |
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| 43 | } |
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| 44 | #endif |
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| 45 | uint64_t ix_sign = ix >> 63; |
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| 46 | uint64_t iy_sign = iy >> 63; |
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| 47 | ix ^= ix_sign >> 1; |
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| 48 | iy ^= iy_sign >> 1; |
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| 49 | return ix <= iy; |
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| 50 | } |
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| 51 | #ifdef SHARED |
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| 52 | # define CONCATX(x, y) x ## y |
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| 53 | # define CONCAT(x, y) CONCATX (x, y) |
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| 54 | # define UNIQUE_ALIAS(name) CONCAT (name, __COUNTER__) |
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| 55 | # define do_symbol(orig_name, name, aliasname) \ |
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| 56 | strong_alias (orig_name, name) \ |
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| 57 | versioned_symbol (libm, name, aliasname, GLIBC_2_31) |
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| 58 | # undef weak_alias |
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| 59 | # define weak_alias(name, aliasname) \ |
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| 60 | do_symbol (name, UNIQUE_ALIAS (name), aliasname); |
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| 61 | #endif |
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| 62 | libm_alias_double (__totalorder, totalorder) |
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| 63 | #if SHLIB_COMPAT (libm, GLIBC_2_25, GLIBC_2_31) |
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| 64 | int |
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| 65 | attribute_compat_text_section |
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| 66 | __totalorder_compat (double x, double y) |
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| 67 | { |
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| 68 | return __totalorder (&x, &y); |
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| 69 | } |
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| 70 | #undef do_symbol |
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| 71 | #define do_symbol(orig_name, name, aliasname) \ |
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| 72 | strong_alias (orig_name, name) \ |
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| 73 | compat_symbol (libm, name, aliasname, \ |
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| 74 | CONCAT (FIRST_VERSION_libm_, aliasname)) |
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| 75 | libm_alias_double (__totalorder_compat, totalorder) |
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| 76 | #endif |
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| 77 | |
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