arch/i386/math-emu/control_w.h

   1 /*---------------------------------------------------------------------------+
   2  |  control_w.h                                                              |
   3  |                                                                           |
   4  | Copyright (C) 1992,1993                                                   |
   5  |                       W. Metzenthen, 22 Parker St, Ormond, Vic 3163,      |
   6  |                       Australia.  E-mail   billm@vaxc.cc.monash.edu.au    |
   7  |                                                                           |
   8  +---------------------------------------------------------------------------*/
   9
  10 #ifndef _CONTROLW_H_
  11 #define _CONTROLW_H_
  12
  13 #ifdef __ASSEMBLY__
  14 #define _Const_(x)      $##x
  15 #else
  16 #define _Const_(x)      x
  17 #endif
  18
  19 #define CW_RC           _Const_(0x0C00) /* rounding control */
  20 #define CW_PC           _Const_(0x0300) /* precision control */
  21
  22 #define CW_Precision    Const_(0x0020)  /* loss of precision mask */
  23 #define CW_Underflow    Const_(0x0010)  /* underflow mask */
  24 #define CW_Overflow     Const_(0x0008)  /* overflow mask */
  25 #define CW_ZeroDiv      Const_(0x0004)  /* divide by zero mask */
  26 #define CW_Denormal     Const_(0x0002)  /* denormalized operand mask */
  27 #define CW_Invalid      Const_(0x0001)  /* invalid operation mask */
  28
  29 #define CW_Exceptions   _Const_(0x003f) /* all masks */
  30
  31 #define RC_RND          _Const_(0x0000)
  32 #define RC_DOWN         _Const_(0x0400)
  33 #define RC_UP           _Const_(0x0800)
  34 #define RC_CHOP         _Const_(0x0C00)
  35
  36 /* p 15-5: Precision control bits affect only the following:
  37    ADD, SUB(R), MUL, DIV(R), and SQRT */
  38 #define PR_24_BITS        _Const_(0x000)
  39 #define PR_53_BITS        _Const_(0x200)
  40 #define PR_64_BITS        _Const_(0x300)
  41 #define PR_RESERVED_BITS  _Const_(0x100)
  42 /* FULL_PRECISION simulates all exceptions masked */
  43 #define FULL_PRECISION  (PR_64_BITS | RC_RND | 0x3f)
  44
  45 #endif /* _CONTROLW_H_ */