sysdeps/sparc/fpu_control.h

   1 /* FPU control word bits.  SPARC version.
   2    Copyright (C) 1997 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Miguel de Icaza
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Library General Public License as
   8    published by the Free Software Foundation; either version 2 of the
   9    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    Library General Public License for more details.
  15
  16    You should have received a copy of the GNU Library General Public
  17    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  18    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19    Boston, MA 02111-1307, USA.  */
  20
  21 #ifndef _FPU_CONTROL_H
  22 #define _FPU_CONTROL_H  1
  23
  24
  25 #include <features.h>
  26
  27 /* precision control */
  28 #define _FPU_EXTENDED 0x00000000     /* RECOMMENDED */
  29 #define _FPU_DOUBLE   0x20000000
  30 #define _FPU_80BIT    0x30000000
  31 #define _FPU_SINGLE   0x10000000     /* DO NOT USE */
  32
  33 /* rounding control / Sparc */
  34 #define _FPU_RC_DOWN    0xc0000000
  35 #define _FPU_RC_UP      0x80000000
  36 #define _FPU_RC_ZERO    0x40000000
  37 #define _FPU_RC_NEAREST 0x0        /* RECOMMENDED */
  38
  39 #define _FPU_RESERVED   0x30300000  /* Reserved bits in cw */
  40
  41
  42 /* Now two recommended cw */
  43
  44 /* Linux default:
  45      - extended precision
  46      - rounding to nearest
  47      - exceptions on overflow, zero divide and NaN */
  48 #define _FPU_DEFAULT  0x1e
  49
  50 /* IEEE:  same as above, but exceptions */
  51 #define _FPU_IEEE     0x0
  52
  53 /* Type of the control word.  */
  54 typedef unsigned int fpu_control_t;
  55
  56 #define _FPU_GETCW(cw) __asm__ ("st %%fsr,%0" : "=m" (*&cw))
  57 #define _FPU_SETCW(cw) __asm__ ("ld %0,%%fsr" : : "m" (*&cw))
  58
  59 /* Default control word set at startup.  */
  60 extern fpu_control_t __fpu_control;
  61
  62 __BEGIN_DECLS
  63
  64 /* Called at startup.  It can be used to manipulate fpu control register.  */
  65 extern void __setfpucw __P ((fpu_control_t));
  66
  67 __END_DECLS
  68
  69 #endif  /* fpu_control.h */