sysdeps/s390/fpu/fpu_control.h

   1 /* FPU control word definitions.  Stub version.
   2    Copyright (C) 2000 Free Software Foundation, Inc.
   3    Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com) and
   4    Martin Schwidefsky (schwidefsky@de.ibm.com).
   5
   6    This file is part of the GNU C Library.
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Library General Public License as
   9    published by the Free Software Foundation; either version 2 of the
  10    License, or (at your option) any later version.
  11
  12    The GNU C Library is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15    Library General Public License for more details.
  16
  17    You should have received a copy of the GNU Library General Public
  18    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  19    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, USA.  */
  21
  22 #ifndef _FPU_CONTROL_H
  23 # define _FPU_CONTROL_H
  24
  25 # include <features.h>
  26
  27 /* These bits are reserved are not changed.  */
  28 # define _FPU_RESERVED 0x070700FC
  29
  30 /* The fdlibm code requires no interrupts for exceptions.  Don't
  31    change the rounding mode, it would break long double I/O!  */
  32 #define _FPU_DEFAULT  0x00000000 /* Default value.  */
  33
  34 /* Type of the control word.  */
  35 typedef unsigned int fpu_control_t;
  36
  37 /* Macros for accessing the hardware control word.  */
  38 #define _FPU_GETCW(cw)  __asm__ volatile ("efpc %0,0" : "=d" (cw))
  39 #define _FPU_SETCW(cw)  __asm__ volatile ("sfpc  %0,0" : : "d" (cw))
  40
  41 /* Default control word set at startup.  */
  42 extern fpu_control_t __fpu_control;
  43
  44 #endif /* _FPU_CONTROL_H */