Last change
on this file since 6888aa2 was 3ae31e9, checked in by Thomas Lopatic <thomas@…>, 8 years ago |
Imported original source code.
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File size:
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[3ae31e9] | 1 | /*
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| 2 | =============================================================================
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| 3 | addfpu.c -- FPU time functions
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| 4 | Version 1 -- 1987-09-14 -- D.N. Lynx Crowe
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| 5 | =============================================================================
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| 6 | */
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| 7 |
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| 8 | #include "stddefs.h"
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| 9 |
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| 10 | #define MAXSEGT 32767
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| 11 |
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| 12 | extern unsigned tofpu(), fromfpu();
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| 13 |
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| 14 | /* |
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| 15 |
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| 16 | */
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| 17 |
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| 18 | /*
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| 19 | =============================================================================
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| 20 | addfpu() -- find next higher FPU time 'k' milliseconds greater than 't'
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| 21 | =============================================================================
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| 22 | */
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| 23 |
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| 24 | unsigned
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| 25 | addfpu(t, k)
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| 26 | unsigned t;
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| 27 | short k;
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| 28 | {
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| 29 | register short x, z;
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| 30 | register unsigned y;
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| 31 |
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| 32 | x = fromfpu(t);
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| 33 |
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| 34 | if (x EQ MAXSEGT)
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| 35 | return(t);
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| 36 |
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| 37 | y = t;
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| 38 | z = x + k;
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| 39 |
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| 40 | if (z GE MAXSEGT)
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| 41 | return(tofpu(MAXSEGT));
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| 42 |
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| 43 | while ((y EQ t) OR (z > x))
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| 44 | y = tofpu(++x);
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| 45 |
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| 46 | return(y);
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| 47 | }
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| 48 |
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| 49 | /* |
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| 50 |
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| 51 | */
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| 52 |
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| 53 | /*
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| 54 | =============================================================================
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| 55 | subfpu() -- find next lower FPU time 'k' milliseconds less than 't'
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| 56 | =============================================================================
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| 57 | */
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| 58 |
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| 59 | unsigned
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| 60 | subfpu(t, k)
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| 61 | unsigned t;
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| 62 | short k;
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| 63 | {
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| 64 | register short x, z;
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| 65 | register unsigned y;
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| 66 |
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| 67 | x = fromfpu(t);
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| 68 |
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| 69 | if (x EQ 1)
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| 70 | return(t);
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| 71 |
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| 72 | y = t;
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| 73 | z = x - k;
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| 74 |
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| 75 | if (z LE 1)
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| 76 | return(tofpu(1));
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| 77 |
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| 78 | while ((y EQ t) OR (z < x))
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| 79 | y = tofpu(--x);
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| 80 |
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| 81 | return(y);
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| 82 | }
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