source: buchla-68k/ram/addfpu.c@ f40a309

Last change on this file since f40a309 was f40a309, checked in by Thomas Lopatic <thomas@…>, 7 years ago

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File size: 1.3 KB
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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
12extern 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
24unsigned
25addfpu(t, k)
26unsigned t;
27short 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
59unsigned
60subfpu(t, k)
61unsigned t;
62short 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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