File: /usr/src/linux/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_ */
46