Interlisp.maiko/inc/arith.h

#ifndef ARITH_H
#define ARITH_H 1
/* $Id: arith.h,v 1.2 1999/01/03 02:05:52 sybalsky Exp $ (C) Copyright Venue, All Rights Reserved  */





/************************************************************************/
/*									*/
/*	(C) Copyright 1989-92 Venue. All Rights Reserved.		*/
/*	Manufactured in the United States of America.			*/
/*									*/
/************************************************************************/


#define	MAX_SMALL	65535		/* == 0x0000FFFF  */
#define	MIN_SMALL	-65536		/* == 0xFFFF0000  */

#define MAX_FIXP	2147483647	/* == 0x7FFFFFFF  */
#define	MIN_FIXP	-2147483648	/* == 0x80000000  */

#define GetSmalldata(x)	(((SEGMASK & x)==S_POSITIVE) ? (0xFFFF & x) : (((SEGMASK & x)==S_NEGATIVE) ? (0xFFFF0000 | x) : error("Not smallp address")))

#define GetSmallp(x)	((0xFFFF0000 & x) ? (((0xFFFF0000 & x)==0xFFFF0000) ? (S_NEGATIVE | (0xFFFF & x)) : error("Not Smallp data") ) : (S_POSITIVE | (0xFFFF & x)))


/* arg sour is Lisp address, arg dest is a box to store the number */
#define	GetNumber(sour, dest){		\
		switch(SEGMASK & sour){\
		case S_POSITIVE:		\
			dest = 0xFFFF & sour;	\
			break;			\
		case S_NEGATIVE:		\
			dest = 0xFFFF0000 | sour;	\
			break;			\
		default:			\
			if(GetTypeNumber( sour ) != TYPE_FIXP){	\
				ufn(0xFF & (*PC));	\
				return;		\
			}			\
			dest = *((int *)Addr68k_from_LADDR(sour));	\
		}				\
	}



#define FIXP_VALUE(dest) *((int *)Addr68k_from_LADDR(dest))

#define FLOATP_VALUE(dest) *((float *)Addr68k_from_LADDR(dest))

#define N_GETNUMBER(sour, dest, label)					\
{		dest = sour;	/* access memory once */ 		\
		switch(SEGMASK & dest){				\
		case S_POSITIVE:					\
			dest = 0xFFFF & (dest);				\
			break;						\
		case S_NEGATIVE:					\
			dest = 0xFFFF0000 | (dest);			\
			break;						\
		default:						\
			if (GetTypeNumber( dest ) != TYPE_FIXP)		\
				{ goto label; }				\
			dest = FIXP_VALUE(dest);			\
		}							\
}

#define N_IGETNUMBER(sour, dest, label)					\
{		dest = sour;	/* access memory once */ 		\
		switch(SEGMASK & dest){				\
		case S_POSITIVE:					\
			dest = 0xFFFF & dest;				\
			break;						\
		case S_NEGATIVE:					\
			dest = 0xFFFF0000 | dest;			\
			break;						\
		default:						\
			switch (GetTypeNumber( dest )) {		\
			case TYPE_FIXP:					\
			  dest = FIXP_VALUE(dest);			\
			  break;					\
			case TYPE_FLOATP:				\
			  {register float temp;				\
			   temp = FLOATP_VALUE(dest) ;			\
			   if (	(temp > ((float) 0x7fffffff)) ||	\
				(temp < ((float) 0x80000000)) )		\
				goto label;				\
			   dest = (int) temp;				\
			   }						\
			  break;					\
			default: goto label;				\
			}						\
			break;						\
		}							\
}


#define ARITH_SWITCH(arg, result)					\
	switch((int) arg & 0xFFFF0000){					\
		case 0:							\
			result = (S_POSITIVE | (int) arg);		\
			break;						\
		case 0xFFFF0000:					\
			result = (S_NEGATIVE | (0xFFFF & (int) arg));	\
			break;						\
		default:{register LispPTR *wordp;			\
			/* arg is FIXP, call createcell */		\
			wordp = (LispPTR *) createcell68k(TYPE_FIXP);	\
			*((int *)wordp) = (int) arg;			\
			result = (LADDR_from_68k(wordp));		\
			break;						\
			}						\
	}


/* *******
	NEED to See if this is faster than the N_ARITH_SWITCH macro

	if( (MIN_FIXP <= result) && (result <= MAX_FIXP) ){
		if(0 <= result){
			if(result <= MAX_SMALL)
				return(S_POSITIVE | result);
			else{
				wordp = createcell68k(TYPE_FIXP);
				*((unsigned int *)wordp) = result;
				return(LADDR_from_68k(wordp));
			}
		}else{
			if(MIN_SMALL <= result)
				return(S_NEGATIVE | (0xFFFF & result));
			else{
				wordp = createcell68k(TYPE_FIXP);
				*((unsigned int *)wordp) = result;
				return(LADDR_from_68k(wordp));
			}
		}/ 
	}
****** */



#define N_ARITH_SWITCH(arg)						\
	switch(arg & 0xFFFF0000){					\
		case 0:							\
			return(S_POSITIVE | arg);			\
		case 0xFFFF0000:					\
			return(S_NEGATIVE | (0xFFFF & arg));		\
		default:{register LispPTR *fixpp;			\
			/* arg is FIXP, call createcell */		\
			fixpp = (LispPTR *) createcell68k(TYPE_FIXP);	\
			*((int *)fixpp) = arg;				\
			return(LADDR_from_68k(fixpp));			\
			}						\
	}


#define N_IARITH_BODY_2(a, tos, op)					\
{									\
register int	arg1,arg2;						\
									\
	N_IGETNUMBER( a, arg1, do_ufn);					\
	N_IGETNUMBER( tos, arg2, do_ufn);				\
									\
	arg1 = arg1 op arg2;						\
									\
	N_ARITH_SWITCH(arg1);						\
									\
do_ufn:	ERROR_EXIT(tos);						\
}


#define N_ARITH_BODY_1(a, n, op)					\
{									\
register int	arg1;							\
									\
	N_GETNUMBER( a, arg1, do_ufn);					\
									\
	arg1 = arg1 op n;						\
									\
N_ARITH_SWITCH(arg1);							\
									\
do_ufn:	ERROR_EXIT(a);							\
}


#define N_ARITH_BODY_1_UNSIGNED(a, n, op)				\
{									\
register unsigned int	arg1;						\
									\
	N_GETNUMBER( a, arg1, do_ufn);					\
									\
	arg1 = arg1 op n;						\
									\
N_ARITH_SWITCH(arg1);							\
									\
do_ufn:	ERROR_EXIT(a);							\
}


#endif /* ARITH_H */