sysdeps/s390/fpu/fpu_control.h

   1 /* FPU control word definitions.  Stub version.
   2    Copyright (C) 2000-2018 Free Software Foundation, Inc.
   3    Contributed by Denis Joseph Barrow (djbarrow@de.ibm.com) and
   4    Martin Schwidefsky (schwidefsky@de.ibm.com).
   5    This file is part of the GNU C Library.
   6
   7    The GNU C Library is free software; you can redistribute it and/or
   8    modify it under the terms of the GNU Lesser General Public
   9    License as published by the Free Software Foundation; either
  10    version 2.1 of the 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    Lesser General Public License for more details.
  16
  17    You should have received a copy of the GNU Lesser General Public
  18    License along with the GNU C Library; if not, see
  19    <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef _FPU_CONTROL_H
  22 #define _FPU_CONTROL_H
  23
  24 #include <features.h>
  25
  26 /* These bits are reserved are not changed.  */
  27 #define _FPU_RESERVED 0x0707FFFC
  28
  29 /* The fdlibm code requires no interrupts for exceptions.  Don't
  30    change the rounding mode, it would break long double I/O!  */
  31 #define _FPU_DEFAULT  0x00000000 /* Default value.  */
  32
  33 /* Type of the control word.  */
  34 typedef unsigned int fpu_control_t;
  35
  36 /* Macros for accessing the hardware control word.  */
  37 #define _FPU_GETCW(cw)  __asm__ __volatile__ ("efpc %0,0" : "=d" (cw))
  38 #define _FPU_SETCW(cw)  __asm__ __volatile__ ("sfpc  %0,0" : : "d" (cw))
  39
  40 /* Default control word set at startup.  */
  41 extern fpu_control_t __fpu_control;
  42
  43 #endif /* _FPU_CONTROL_H */