62 lines
2.4 KiB
C
62 lines
2.4 KiB
C
/*---------------------------------------------------------------------------+
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| status_w.h |
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| $Id: status_w.h,v 1.6 2003-07-31 21:07:38 sshwarts Exp $
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| Copyright (C) 1992,1993 |
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| W. Metzenthen, 22 Parker St, Ormond, Vic 3163, |
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| Australia. E-mail billm@vaxc.cc.monash.edu.au |
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+---------------------------------------------------------------------------*/
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#ifndef _STATUS_H_
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#define _STATUS_H_
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#include "fpu_emu.h" /* for definition of PECULIAR_486 */
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#define SW_Backward (0x8000) /* backward compatibility */
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#define SW_C3 (0x4000) /* condition bit 3 */
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#define SW_Top (0x3800) /* top of stack */
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#define SW_Top_Shift (11) /* shift for top of stack bits */
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#define SW_C2 (0x0400) /* condition bit 2 */
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#define SW_C1 (0x0200) /* condition bit 1 */
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#define SW_C0 (0x0100) /* condition bit 0 */
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#define SW_Summary (0x0080) /* exception summary */
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#define SW_Stack_Fault (0x0040) /* stack fault */
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#define SW_Precision (0x0020) /* loss of precision */
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#define SW_Underflow (0x0010) /* underflow */
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#define SW_Overflow (0x0008) /* overflow */
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#define SW_Zero_Div (0x0004) /* divide by zero */
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#define SW_Denorm_Op (0x0002) /* denormalized operand */
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#define SW_Invalid (0x0001) /* invalid operation */
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#define SW_Exc_Mask (0x27f) /* Status word exception bit mask */
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#define COMP_A_gt_B 1
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#define COMP_A_eq_B 2
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#define COMP_A_lt_B 3
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#define COMP_No_Comp 4
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#define COMP_Denormal 0x20
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#define COMP_NaN 0x40
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#define COMP_SNaN 0x80
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#define status_word() \
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((FPU_partial_status & ~SW_Top & 0xffff) | ((FPU_tos << SW_Top_Shift) & SW_Top))
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/*
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* bbd: use do {...} while (0) structure instead of using curly brackets
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* inside parens, which most compilers do not like.
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*/
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#define setcc(cc) do { \
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FPU_partial_status &= ~(SW_C0|SW_C1|SW_C2|SW_C3); \
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FPU_partial_status |= (cc) & (SW_C0|SW_C1|SW_C2|SW_C3); } while(0)
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#ifdef PECULIAR_486
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/* Default, this conveys no information, but an 80486 does it. */
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/* Clear the SW_C1 bit, "other bits undefined". */
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# define clear_C1() { FPU_partial_status &= ~SW_C1; }
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# else
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# define clear_C1()
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#endif /* PECULIAR_486 */
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#endif /* _STATUS_H_ */
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