From c19459a92177fc8864b461e84d017a21c4006dc5 Mon Sep 17 00:00:00 2001 From: joseph Date: Sun, 28 Apr 2013 15:21:50 +0000 Subject: Merge changes between r22663 and r22954 from /fsf/trunk. git-svn-id: svn://svn.eglibc.org/trunk@22955 7b3dc134-2b1b-0410-93df-9e9f96275f8d --- libc/sysdeps/ieee754/ldbl-128/s_issignalingl.c | 45 ++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) create mode 100644 libc/sysdeps/ieee754/ldbl-128/s_issignalingl.c (limited to 'libc/sysdeps/ieee754/ldbl-128/s_issignalingl.c') diff --git a/libc/sysdeps/ieee754/ldbl-128/s_issignalingl.c b/libc/sysdeps/ieee754/ldbl-128/s_issignalingl.c new file mode 100644 index 000000000..b69a66d0b --- /dev/null +++ b/libc/sysdeps/ieee754/ldbl-128/s_issignalingl.c @@ -0,0 +1,45 @@ +/* Test for signaling NaN. + Copyright (C) 2013 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 + . */ + +#include +#include + +int +__issignalingl (long double x) +{ + u_int64_t hxi, lxi __attribute__ ((unused)); + GET_LDOUBLE_WORDS64 (hxi, lxi, x); +#ifdef HIGH_ORDER_BIT_IS_SET_FOR_SNAN + /* We only have to care about the high-order bit of x's significand, because + having it set (sNaN) already makes the significand different from that + used to designate infinity. */ + return ((hxi & UINT64_C (0x7fff800000000000)) + == UINT64_C (0x7fff800000000000)); +#else + /* To keep the following comparison simple, toggle the quiet/signaling bit, + so that it is set for sNaNs. This is inverse to IEEE 754-2008 (as well as + common practice for IEEE 754-1985). */ + hxi ^= UINT64_C (0x0000800000000000); + /* If lxi != 0, then set any suitable bit of the significand in hxi. */ + hxi |= (lxi | -lxi) >> 63; + /* We have to compare for greater (instead of greater or equal), because x's + significand being all-zero designates infinity not NaN. */ + return (hxi & UINT64_C (0x7fffffffffffffff)) > UINT64_C (0x7fff800000000000); +#endif +} +libm_hidden_def (__issignalingl) -- cgit v1.2.1