StdLib/Include/Arm/machine/fenv.h

   1 /*  $NetBSD: fenv.h,v 1.2 2014/01/29 00:22:09 matt Exp $    */
   2 /** @file
   3 *
   4 *  Copyright (c) 2013 - 2014, ARM Limited. All rights reserved.
   5 *
   6 *  This program and the accompanying materials
   7 *  are licensed and made available under the terms and conditions of the BSD License
   8 *  which accompanies this distribution.  The full text of the license may be found at
   9 *  http://opensource.org/licenses/bsd-license.php
  10 *
  11 *  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  12 *  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  13 *
  14 **/
  15  /*
  16  * Based on ieeefp.h written by J.T. Conklin, Apr 28, 1995
  17  * Public domain.
  18  */
  19
  20 #ifndef _ARM_FENV_H_
  21 #define _ARM_FENV_H_
  22
  23 #ifdef __ARM_PCS_AAPCS64
  24 /* AArch64 split FPSCR into two registers FPCR and FPSR */
  25 typedef struct {
  26     unsigned int __fpcr;
  27     unsigned int __fpsr;
  28 } fenv_t;
  29 #else
  30 typedef int fenv_t;     /* FPSCR */
  31 #endif
  32 typedef int fexcept_t;
  33
  34 #define FE_INVALID      0x01    /* invalid operation exception */
  35 #define FE_DIVBYZERO    0x02    /* divide-by-zero exception */
  36 #define FE_OVERFLOW     0x04    /* overflow exception */
  37 #define FE_UNDERFLOW    0x08    /* underflow exception */
  38 #define FE_INEXACT      0x10    /* imprecise (loss of precision; "inexact") */
  39
  40 #define FE_ALL_EXCEPT   0x1f
  41
  42 #define FE_TONEAREST    0   /* round to nearest representable number */
  43 #define FE_UPWARD       1   /* round toward positive infinity */
  44 #define FE_DOWNWARD     2   /* round toward negative infinity */
  45 #define FE_TOWARDZERO   3   /* round to zero (truncate) */
  46
  47 __BEGIN_DECLS
  48
  49 /* Default floating-point environment */
  50 extern const fenv_t   __fe_dfl_env;
  51 #define FE_DFL_ENV    (&__fe_dfl_env)
  52
  53 __END_DECLS
  54
  55 #endif /* _ARM_FENV_H_ */