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author | Thomas Schwinge <thomas@codesourcery.com> | 2013-05-26 16:34:06 +0200 |
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committer | Thomas Schwinge <thomas@codesourcery.com> | 2013-05-26 16:34:06 +0200 |
commit | f0f440a6f2e5b88e9f4114110d37689c6148e13d (patch) | |
tree | 70cde5327dcfb101349a0ec50a7d13b4431d7f6e /sysdeps/ieee754/ldbl-128/s_issignalingl.c | |
parent | de1463d3e4657cf44779185870cdf5a22ee1e415 (diff) | |
parent | e631e5064e2efc594149a07e726ed086f2d8b84d (diff) |
Merge commit 'refs/top-bases/t/hurdsig-global-dispositions-versions' into t/hurdsig-global-dispositions-versions
Diffstat (limited to 'sysdeps/ieee754/ldbl-128/s_issignalingl.c')
-rw-r--r-- | sysdeps/ieee754/ldbl-128/s_issignalingl.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/sysdeps/ieee754/ldbl-128/s_issignalingl.c b/sysdeps/ieee754/ldbl-128/s_issignalingl.c new file mode 100644 index 0000000000..b69a66d0ba --- /dev/null +++ b/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 + <http://www.gnu.org/licenses/>. */ + +#include <math.h> +#include <math_private.h> + +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) |