diff options
Diffstat (limited to 'sysdeps/ieee754/dbl-64/s_totalorder.c')
-rw-r--r-- | sysdeps/ieee754/dbl-64/s_totalorder.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/sysdeps/ieee754/dbl-64/s_totalorder.c b/sysdeps/ieee754/dbl-64/s_totalorder.c new file mode 100644 index 0000000000..59092dceda --- /dev/null +++ b/sysdeps/ieee754/dbl-64/s_totalorder.c @@ -0,0 +1,53 @@ +/* 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) |