1 /* Inline floating-point environment handling functions for powerpc. 2 Copyright (C) 1995, 1996, 1997, 1998, 1999, 2006 3 Free Software Foundation, Inc. 4 This file is part of the GNU C Library. 5 6 The GNU C Library is free software; you can redistribute it and/or 7 modify it under the terms of the GNU Lesser General Public 8 License as published by the Free Software Foundation; either 9 version 2.1 of the License, or (at your option) any later version. 10 11 The GNU C Library is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 Lesser General Public License for more details. 15 16 You should have received a copy of the GNU Lesser General Public 17 License along with the GNU C Library; if not, see 18 <http://www.gnu.org/licenses/>. */ 19 20 #include <features.h> 21 22 #if defined __GNUC__ && !defined _SOFT_FLOAT && !defined __NO_MATH_INLINES 23 24 /* Inline definition for fegetround. */ 25 # define fegetround() \ 26 (__extension__ ({ int __fegetround_result; \ 27 __asm__ __volatile__ \ 28 ("mcrfs 7,7 ; mfcr %0" \ 29 : "=r"(__fegetround_result) : : "cr7"); \ 30 __fegetround_result & 3; })) 31 32 /* The weird 'i#*X' constraints on the following suppress a gcc 33 warning when __excepts is not a constant. Otherwise, they mean the 34 same as just plain 'i'. */ 35 36 /* Inline definition for feraiseexcept. */ 37 # define feraiseexcept(__excepts) \ 38 ((__builtin_constant_p (__excepts) \ 39 && ((__excepts) & ((__excepts)-1)) == 0 \ 40 && (__excepts) != FE_INVALID) \ 41 ? ((__excepts) != 0 \ 42 ? (__extension__ ({ __asm__ __volatile__ \ 43 ("mtfsb1 %s0" \ 44 : : "i#*X"(__builtin_ffs (__excepts))); \ 45 0; })) \ 46 : 0) \ 47 : (feraiseexcept) (__excepts)) 48 49 /* Inline definition for feclearexcept. */ 50 # define feclearexcept(__excepts) \ 51 ((__builtin_constant_p (__excepts) \ 52 && ((__excepts) & ((__excepts)-1)) == 0 \ 53 && (__excepts) != FE_INVALID) \ 54 ? ((__excepts) != 0 \ 55 ? (__extension__ ({ __asm__ __volatile__ \ 56 ("mtfsb0 %s0" \ 57 : : "i#*X"(__builtin_ffs (__excepts))); \ 58 0; })) \ 59 : 0) \ 60 : (feclearexcept) (__excepts)) 61 62 #endif /* __GNUC__ && !_SOFT_FLOAT */ 63 64