sysdeps/generic/fpu_control.h

   1 /* FPU control word definitions.  Stub version.
   2    Copyright (C) 1996, 1997 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 Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    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    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #ifndef _FPU_CONTROL_H
  21 #define _FPU_CONTROL_H
  22
  23 #define _FPU_RESERVED ???       /* These bits are reserved are not changed.  */
  24
  25 /* The fdlibm code requires no interrupts for exceptions.  Don't
  26    change the rounding mode, it would break long double I/O!  */
  27 #define _FPU_DEFAULT  0x00000000 /* Default value.  */
  28
  29 /* Type of the control word.  */
  30 typedef unsigned int fpu_control_t __attribute__ ((__mode__ (__?I__)));
  31
  32 /* Macros for accessing the hardware control word.  */
  33 #define _FPU_GETCW(cw) __asm__ ("fetch fpu control word into %0" : "=g" (cw))
  34 #define _FPU_SETCW(cw) __asm__ ("set fpu control word to %0" : : "g" (cw))
  35
  36 /* Default control word set at startup.  */
  37 extern fpu_control_t __fpu_control;
  38
  39 __BEGIN_DECLS
  40
  41 /* Called at startup.  It can be used to manipulate fpu control register.  */
  42 extern void __setfpucw __P ((fpu_control_t));
  43
  44 __END_DECLS
  45
  46 #endif /* _FPU_CONTROL_H */