sysdeps/sh/sh4/fpu/fpu_control.h

   1 /* FPU control word definitions.  SH version.
   2    Copyright (C) 1999-2014 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, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _FPU_CONTROL_H
  20 #define _FPU_CONTROL_H
  21
  22 #include <features.h>
  23
  24 /* masking of interrupts */
  25 #define _FPU_MASK_VM    0x0800  /* Invalid operation */
  26 #define _FPU_MASK_ZM    0x0400  /* Division by zero  */
  27 #define _FPU_MASK_OM    0x0200  /* Overflow          */
  28 #define _FPU_MASK_UM    0x0100  /* Underflow         */
  29 #define _FPU_MASK_IM    0x0080  /* Inexact operation */
  30
  31 /* rounding control */
  32 #define _FPU_RC_NEAREST 0x0     /* RECOMMENDED */
  33 #define _FPU_RC_ZERO    0x1
  34
  35 #define _FPU_RESERVED 0xffc00000  /* These bits are reserved.  */
  36
  37 /* The fdlibm code requires strict IEEE double precision arithmetic,
  38    and no interrupts for exceptions, rounding to nearest.  */
  39 #define _FPU_DEFAULT    0x00080000 /* Default value.  */
  40 #define _FPU_IEEE       0x00080f80 /* Default + exceptions enabled. */
  41
  42 /* Type of the control word.  */
  43 typedef unsigned int fpu_control_t;
  44
  45 /* Macros for accessing the hardware control word.  */
  46 #define _FPU_GETCW(cw) __asm__ ("sts fpscr,%0" : "=r" (cw))
  47
  48 #if defined __GNUC__
  49 __BEGIN_DECLS
  50
  51 /* GCC provides this function.  */
  52 extern void __set_fpscr (unsigned long);
  53 #define _FPU_SETCW(cw) __set_fpscr ((cw))
  54 #else
  55 #define _FPU_SETCW(cw) __asm__ ("lds %0,fpscr" : : "r" (cw))
  56 #endif
  57
  58 /* Default control word set at startup.  */
  59 extern fpu_control_t __fpu_control;
  60
  61 __END_DECLS
  62 #endif /* _FPU_CONTROL_H */