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