sysdeps/powerpc/fpu/bits/fenvinline.h

   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, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #if defined __GNUC__ && !defined _SOFT_FLOAT && !defined __NO_MATH_INLINES
  22
  23 /* Inline definition for fegetround.  */
  24 # define fegetround() \
  25   (__extension__  ({ int __fegetround_result;                                 \
  26                      __asm__ __volatile__                                     \
  27                        ("mcrfs 7,7 ; mfcr %0"                                 \
  28                         : "=r"(__fegetround_result) : : "cr7");               \
  29                      __fegetround_result & 3; }))
  30
  31 /* The weird 'i#*X' constraints on the following suppress a gcc
  32    warning when __excepts is not a constant.  Otherwise, they mean the
  33    same as just plain 'i'.  */
  34
  35 /* Inline definition for feraiseexcept.  */
  36 # define feraiseexcept(__excepts) \
  37   ((__builtin_constant_p (__excepts)                                          \
  38     && ((__excepts) & ((__excepts)-1)) == 0                                   \
  39     && (__excepts) != FE_INVALID)                                             \
  40    ? ((__excepts) != 0                                                        \
  41       ? (__extension__ ({ __asm__ __volatile__                                \
  42                           ("mtfsb1 %s0"                                       \
  43                            : : "i#*X"(__builtin_ffs (__excepts)));            \
  44                           0; }))                                              \
  45       : 0)                                                                    \
  46    : (feraiseexcept) (__excepts))
  47
  48 /* Inline definition for feclearexcept.  */
  49 # define feclearexcept(__excepts) \
  50   ((__builtin_constant_p (__excepts)                                          \
  51     && ((__excepts) & ((__excepts)-1)) == 0                                   \
  52     && (__excepts) != FE_INVALID)                                             \
  53    ? ((__excepts) != 0                                                        \
  54       ? (__extension__ ({ __asm__ __volatile__                                \
  55                           ("mtfsb0 %s0"                                       \
  56                            : : "i#*X"(__builtin_ffs (__excepts)));            \
  57                           0; }))                                              \
  58       : 0)                                                                    \
  59    : (feclearexcept) (__excepts))
  60
  61 #endif /* __GNUC__ && !_SOFT_FLOAT */