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/*---------------------------------------------------------------------------+
| status_w.h |
| |
| Copyright (C) 1992,1993 |
| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
| Australia. E-mail billm@vaxc.cc.monash.edu.au |
| |
+---------------------------------------------------------------------------*/
#ifndef _STATUS_H_
#define _STATUS_H_
#include "fpu_emu.h" /* for definition of PECULIAR_486 */
#ifdef __ASSEMBLY__
#define Const__(x) $##x
#else
#define Const__(x) x
#endif
#define SW_Backward Const__(0x8000) /* backward compatibility */
#define SW_C3 Const__(0x4000) /* condition bit 3 */
#define SW_Top Const__(0x3800) /* top of stack */
#define SW_Top_Shift Const__(11) /* shift for top of stack bits */
#define SW_C2 Const__(0x0400) /* condition bit 2 */
#define SW_C1 Const__(0x0200) /* condition bit 1 */
#define SW_C0 Const__(0x0100) /* condition bit 0 */
#define SW_Summary Const__(0x0080) /* exception summary */
#define SW_Stack_Fault Const__(0x0040) /* stack fault */
#define SW_Precision Const__(0x0020) /* loss of precision */
#define SW_Underflow Const__(0x0010) /* underflow */
#define SW_Overflow Const__(0x0008) /* overflow */
#define SW_Zero_Div Const__(0x0004) /* divide by zero */
#define SW_Denorm_Op Const__(0x0002) /* denormalized operand */
#define SW_Invalid Const__(0x0001) /* invalid operation */
#define SW_Exc_Mask Const__(0x27f) /* Status word exception bit mask */
#ifndef __ASSEMBLY__
#define COMP_A_gt_B 1
#define COMP_A_eq_B 2
#define COMP_A_lt_B 3
#define COMP_No_Comp 4
#define COMP_Denormal 0x20
#define COMP_NaN 0x40
#define COMP_SNaN 0x80
#define status_word() \
((partial_status & ~SW_Top & 0xffff) | ((top << SW_Top_Shift) & SW_Top))
#define setcc(cc) ({ \
partial_status &= ~(SW_C0|SW_C1|SW_C2|SW_C3); \
partial_status |= (cc) & (SW_C0|SW_C1|SW_C2|SW_C3); })
#ifdef PECULIAR_486
/* Default, this conveys no information, but an 80486 does it. */
/* Clear the SW_C1 bit, "other bits undefined". */
# define clear_C1() { partial_status &= ~SW_C1; }
# else
# define clear_C1()
#endif /* PECULIAR_486 */
#endif /* __ASSEMBLY__ */
#endif /* _STATUS_H_ */
|
