sysdeps/powerpc/bits/fenvinline.h

   1 /* Inline floating-point environment handling functions for powerpc.
   2    Copyright (C) 1995-2014 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #if (defined __GNUC__ && !defined _SOFT_FLOAT && !defined __NO_FPRS__   \
  20      && !defined __NO_MATH_INLINES)
  21
  22 /* Inline definition for fegetround.  */
  23 # define fegetround() \
  24   (__extension__  ({ int __fegetround_result;                                 \
  25                      __asm__ __volatile__                                     \
  26                        ("mcrfs 7,7 ; mfcr %0"                                 \
  27                         : "=r"(__fegetround_result) : : "cr7");               \
  28                      __fegetround_result & 3; }))
  29
  30 /* The weird 'i#*X' constraints on the following suppress a gcc
  31    warning when __excepts is not a constant.  Otherwise, they mean the
  32    same as just plain 'i'.  */
  33
  34 /* Inline definition for feraiseexcept.  */
  35 # define feraiseexcept(__excepts) \
  36   ((__builtin_constant_p (__excepts)                                          \
  37     && ((__excepts) & ((__excepts)-1)) == 0                                   \
  38     && (__excepts) != FE_INVALID)                                             \
  39    ? ((__excepts) != 0                                                        \
  40       ? (__extension__ ({ __asm__ __volatile__                                \
  41                           ("mtfsb1 %s0"                                       \
  42                            : : "i#*X"(__builtin_ffs (__excepts)));            \
  43                           0; }))                                              \
  44       : 0)                                                                    \
  45    : (feraiseexcept) (__excepts))
  46
  47 /* Inline definition for feclearexcept.  */
  48 # define feclearexcept(__excepts) \
  49   ((__builtin_constant_p (__excepts)                                          \
  50     && ((__excepts) & ((__excepts)-1)) == 0                                   \
  51     && (__excepts) != FE_INVALID)                                             \
  52    ? ((__excepts) != 0                                                        \
  53       ? (__extension__ ({ __asm__ __volatile__                                \
  54                           ("mtfsb0 %s0"                                       \
  55                            : : "i#*X"(__builtin_ffs (__excepts)));            \
  56                           0; }))                                              \
  57       : 0)                                                                    \
  58    : (feclearexcept) (__excepts))
  59
  60 #endif /* __GNUC__ && !_SOFT_FLOAT && !__NO_FPRS__ */