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ADDFPU.C@ cbe2c15

Last change on this file since cbe2c15 was 3ae31e9, checked in by Thomas Lopatic <thomas@…>, 8 years ago
Imported original source code.
Property mode set to `100755`
File size: 1.4 KB

Rev	Line
[3ae31e9]	1	/*
	2	=============================================================================
	3	addfpu.c -- FPU time functions
	4	Version 1 -- 1987-09-14 -- D.N. Lynx Crowe
	5	=============================================================================
	6	*/
	7
	8	#include "stddefs.h"
	9
	10	#define MAXSEGT 32767
	11
	12	extern unsigned tofpu(), fromfpu();
	13
	14	/*
	15
	16	*/
	17
	18	/*
	19	=============================================================================
	20	addfpu() -- find next higher FPU time 'k' milliseconds greater than 't'
	21	=============================================================================
	22	*/
	23
	24	unsigned
	25	addfpu(t, k)
	26	unsigned t;
	27	short k;
	28	{
	29	register short x, z;
	30	register unsigned y;
	31
	32	x = fromfpu(t);
	33
	34	if (x EQ MAXSEGT)
	35	return(t);
	36
	37	y = t;
	38	z = x + k;
	39
	40	if (z GE MAXSEGT)
	41	return(tofpu(MAXSEGT));
	42
	43	while ((y EQ t) OR (z > x))
	44	y = tofpu(++x);
	45
	46	return(y);
	47	}
	48
	49	/*
	50
	51	*/
	52
	53	/*
	54	=============================================================================
	55	subfpu() -- find next lower FPU time 'k' milliseconds less than 't'
	56	=============================================================================
	57	*/
	58
	59	unsigned
	60	subfpu(t, k)
	61	unsigned t;
	62	short k;
	63	{
	64	register short x, z;
	65	register unsigned y;
	66
	67	x = fromfpu(t);
	68
	69	if (x EQ 1)
	70	return(t);
	71
	72	y = t;
	73	z = x - k;
	74
	75	if (z LE 1)
	76	return(tofpu(1));
	77
	78	while ((y EQ t) OR (z < x))
	79	y = tofpu(--x);
	80
	81	return(y);
	82	}

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