| 1 | /* Total order operation. ldbl-96 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 <float.h> |
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| 20 | #include <math.h> |
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| 21 | #include <math_private.h> |
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| 22 | #include <libm-alias-ldouble.h> |
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| 23 | #include <nan-high-order-bit.h> |
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| 24 | #include <stdint.h> |
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| 25 | #include <shlib-compat.h> |
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| 26 | #include <first-versions.h> |
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| 27 | |
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| 28 | int |
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| 29 | __totalorderl (const long double *x, const long double *y) |
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| 30 | { |
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| 31 | int16_t expx, expy; |
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| 32 | uint32_t hx, hy; |
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| 33 | uint32_t lx, ly; |
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| 34 | GET_LDOUBLE_WORDS (expx, hx, lx, *x); |
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| 35 | GET_LDOUBLE_WORDS (expy, hy, ly, *y); |
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| 36 | if (LDBL_MIN_EXP == -16382) |
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| 37 | { |
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| 38 | /* M68K variant: for the greatest exponent, the high mantissa |
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| 39 | bit is not significant and both values of it are valid, so |
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| 40 | set it before comparing. For the Intel variant, only one |
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| 41 | value of the high mantissa bit is valid for each exponent, so |
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| 42 | this is not necessary. */ |
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| 43 | if ((expx & 0x7fff) == 0x7fff) |
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| 44 | hx |= 0x80000000; |
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| 45 | if ((expy & 0x7fff) == 0x7fff) |
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| 46 | hy |= 0x80000000; |
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| 47 | } |
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| 48 | #if HIGH_ORDER_BIT_IS_SET_FOR_SNAN |
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| 49 | # error not implemented |
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| 50 | #endif |
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| 51 | uint32_t x_sign = expx >> 15; |
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| 52 | uint32_t y_sign = expy >> 15; |
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| 53 | expx ^= x_sign >> 17; |
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| 54 | hx ^= x_sign; |
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| 55 | lx ^= x_sign; |
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| 56 | expy ^= y_sign >> 17; |
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| 57 | hy ^= y_sign; |
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| 58 | ly ^= y_sign; |
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| 59 | return expx < expy || (expx == expy && (hx < hy || (hx == hy && lx <= ly))); |
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| 60 | } |
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| 61 | #ifdef SHARED |
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| 62 | # define CONCATX(x, y) x ## y |
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| 63 | # define CONCAT(x, y) CONCATX (x, y) |
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| 64 | # define UNIQUE_ALIAS(name) CONCAT (name, __COUNTER__) |
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| 65 | # define do_symbol(orig_name, name, aliasname) \ |
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| 66 | strong_alias (orig_name, name) \ |
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| 67 | versioned_symbol (libm, name, aliasname, GLIBC_2_31) |
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| 68 | # undef weak_alias |
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| 69 | # define weak_alias(name, aliasname) \ |
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| 70 | do_symbol (name, UNIQUE_ALIAS (name), aliasname); |
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| 71 | #endif |
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| 72 | libm_alias_ldouble (__totalorder, totalorder) |
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| 73 | #if SHLIB_COMPAT (libm, GLIBC_2_25, GLIBC_2_31) |
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| 74 | int |
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| 75 | attribute_compat_text_section |
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| 76 | __totalorder_compatl (long double x, long double y) |
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| 77 | { |
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| 78 | return __totalorderl (&x, &y); |
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| 79 | } |
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| 80 | #undef do_symbol |
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| 81 | #define do_symbol(orig_name, name, aliasname) \ |
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| 82 | strong_alias (orig_name, name) \ |
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| 83 | compat_symbol (libm, name, aliasname, \ |
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| 84 | CONCAT (FIRST_VERSION_libm_, aliasname)) |
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| 85 | libm_alias_ldouble (__totalorder_compat, totalorder) |
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| 86 | #endif |
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| 87 | |
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