sysdeps/powerpc/fpu/bits/fenvinline.h

   1 /* Inline floating-point environment handling functions for powerpc.
   2    Copyright (C) 1995, 1996, 1997, 1998, 1999 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #if defined __GNUC__ && !defined _SOFT_FLOAT && !defined __NO_MATH_INLINES
  21
  22 /* Inline definition for fegetround.  */
  23 # define fegetround() \
  24   (__extension__  ({ int __fegetround_result;                                 \
  25                      __asm__ ("mcrfs 7,7 ; mfcr %0"                           \
  26                              : "=r"(__fegetround_result) : : "cr7");          \
  27                      __fegetround_result & 3; }))
  28
  29 /* The weird 'i#*X' constraints on the following suppress a gcc
  30    warning when __excepts is not a constant.  Otherwise, they mean the
  31    same as just plain 'i'.  */
  32
  33 /* Inline definition for feraiseexcept.  */
  34 # define feraiseexcept(__excepts) \
  35   ((__builtin_constant_p (__excepts)                                          \
  36     && ((__excepts) & ((__excepts)-1)) == 0                                   \
  37     && (__excepts) != FE_INVALID)                                             \
  38    ? ((__excepts) != 0                                                        \
  39       ? (__extension__ ({ __asm__ __volatile__                                \
  40                           ("mtfsb1 %s0"                                       \
  41                            : : "i#*X"(__builtin_ffs (__excepts)));            \
  42                           0; }))                                              \
  43       : 0)                                                                    \
  44    : (feraiseexcept) (__excepts))
  45
  46 /* Inline definition for feclearexcept.  */
  47 # define feclearexcept(__excepts) \
  48   ((__builtin_constant_p (__excepts)                                          \
  49     && ((__excepts) & ((__excepts)-1)) == 0                                   \
  50     && (__excepts) != FE_INVALID)                                             \
  51    ? ((__excepts) != 0                                                        \
  52       ? (__extension__ ({ __asm__ __volatile__                                \
  53                           ("mtfsb0 %s0"                                       \
  54                            : : "i#*X"(__builtin_ffs (__excepts)));            \
  55                           0; }))                                              \
  56       : 0)                                                                    \
  57    : (feclearexcept) (__excepts))
  58
  59 #endif /* __GNUC__ && !_SOFT_FLOAT */