| /* Test for signaling NaN. |

| Copyright (C) 2013-2018 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 "quadmath-imp.h" |

| |

| int |

| issignalingq (__float128 x) |

| { |

| uint64_t hxi, lxi __attribute__ ((unused)); |

| GET_FLT128_WORDS64 (hxi, lxi, x); |

| #if 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 |

| } |