diff options
| -rw-r--r-- | sysdeps/generic/nan-pseudo-number.h | 31 | ||||
| -rw-r--r-- | sysdeps/ieee754/ldbl-96/s_issignalingl.c | 11 | ||||
| -rw-r--r-- | sysdeps/x86/fpu/nan-pseudo-number.h | 30 |
3 files changed, 69 insertions, 3 deletions
diff --git a/sysdeps/generic/nan-pseudo-number.h b/sysdeps/generic/nan-pseudo-number.h new file mode 100644 index 0000000..b39e347 --- /dev/null +++ b/sysdeps/generic/nan-pseudo-number.h @@ -0,0 +1,31 @@ +/* Pseudo-normal number handling. Generic version. + Copyright (C) 2020 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 + <https://www.gnu.org/licenses/>. */ + +#ifndef NAN_PSEUDO_NUMBER_H +#define NAN_PSEUDO_NUMBER_H 1 + +/* Set this macro and override the definition of IS_PSEUDO_SIGNALING if pseudo + numbers need special handling. */ +#define HANDLE_PSEUDO_NUMBERS 0 +static inline int +is_pseudo_signaling (uint32_t exi, uint32_t hxi) +{ + return 0; +} + +#endif /* nan-pseudo-number.h */ diff --git a/sysdeps/ieee754/ldbl-96/s_issignalingl.c b/sysdeps/ieee754/ldbl-96/s_issignalingl.c index ec542ad..37e05aa 100644 --- a/sysdeps/ieee754/ldbl-96/s_issignalingl.c +++ b/sysdeps/ieee754/ldbl-96/s_issignalingl.c @@ -19,12 +19,19 @@ #include <math.h> #include <math_private.h> #include <nan-high-order-bit.h> +#include <nan-pseudo-number.h> int __issignalingl (long double x) { uint32_t exi, hxi, lxi; GET_LDOUBLE_WORDS (exi, hxi, lxi, x); + + /* By default we do not recognize a pseudo NaN as sNaN. However on 80387 and + later all pseudo numbers including pseudo NaNs result in a signal and are + hence recognized as signaling. */ + int ret = is_pseudo_signaling (exi, hxi); + #if HIGH_ORDER_BIT_IS_SET_FOR_SNAN # error not implemented #else @@ -34,11 +41,9 @@ __issignalingl (long double x) hxi ^= 0x40000000; /* If lxi != 0, then set any suitable bit of the significand in hxi. */ hxi |= (lxi | -lxi) >> 31; - /* We do not recognize a pseudo NaN as sNaN; they're invalid on 80387 and - later. */ /* We have to compare for greater (instead of greater or equal), because x's significand being all-zero designates infinity not NaN. */ - return ((exi & 0x7fff) == 0x7fff) && (hxi > 0xc0000000); + return ret || (((exi & 0x7fff) == 0x7fff) && (hxi > 0xc0000000)); #endif } libm_hidden_def (__issignalingl) diff --git a/sysdeps/x86/fpu/nan-pseudo-number.h b/sysdeps/x86/fpu/nan-pseudo-number.h new file mode 100644 index 0000000..ea43b17 --- /dev/null +++ b/sysdeps/x86/fpu/nan-pseudo-number.h @@ -0,0 +1,30 @@ +/* Pseudo-normal number handling. x86 version. + Copyright (C) 2020 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 + <https://www.gnu.org/licenses/>. */ + +#ifndef NAN_PSEUDO_NUMBER_H +#define NAN_PSEUDO_NUMBER_H 1 + +#define HANDLE_PSEUDO_NUMBERS 1 +/* Pseudo numbers on x86 are always signaling. */ +static inline int +is_pseudo_signaling (uint32_t exi, uint32_t hxi) +{ + return ((exi & 0x7fff) && ((hxi & 0x80000000) == 0)); +} + +#endif /* nan-pseudo-number.h */ |