| /* Total order operation. dbl-64 version. |
| Copyright (C) 2016-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <math.h> |
| #include <math_private.h> |
| #include <libm-alias-double.h> |
| #include <nan-high-order-bit.h> |
| #include <stdint.h> |
| |
| int |
| __totalorder (double x, double y) |
| { |
| int32_t hx, hy; |
| uint32_t lx, ly; |
| EXTRACT_WORDS (hx, lx, x); |
| EXTRACT_WORDS (hy, ly, y); |
| #if HIGH_ORDER_BIT_IS_SET_FOR_SNAN |
| uint32_t uhx = hx & 0x7fffffff, uhy = hy & 0x7fffffff; |
| /* For the preferred quiet NaN convention, this operation is a |
| comparison of the representations of the arguments interpreted as |
| sign-magnitude integers. If both arguments are NaNs, invert the |
| quiet/signaling bit so comparing that way works. */ |
| if ((uhx > 0x7ff00000 || (uhx == 0x7ff00000 && lx != 0)) |
| && (uhy > 0x7ff00000 || (uhy == 0x7ff00000 && ly != 0))) |
| { |
| hx ^= 0x00080000; |
| hy ^= 0x00080000; |
| } |
| #endif |
| uint32_t hx_sign = hx >> 31; |
| uint32_t hy_sign = hy >> 31; |
| hx ^= hx_sign >> 1; |
| lx ^= hx_sign; |
| hy ^= hy_sign >> 1; |
| ly ^= hy_sign; |
| return hx < hy || (hx == hy && lx <= ly); |
| } |
| libm_alias_double (__totalorder, totalorder) |
