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Linux/arch/x86/math-emu/control_w.h

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  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_ */
 46 

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