fieker-DuValspielwiese
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Last change
on this file since 48e0bcb was
a3f0fea,
checked in by Reimer Behrends <behrends@…>, 5 years ago
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Modify variable declarions for pSingular.
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-
Property mode set to
100644
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File size:
1.8 KB
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| 1 | /* emacs edit mode for this file is -*- C++ -*- */ |
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| 2 | |
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| 3 | |
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| 4 | #include "config.h" |
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| 5 | |
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| 6 | |
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| 7 | #include <string.h> |
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| 8 | |
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| 9 | #include "cf_assert.h" |
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| 10 | |
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| 11 | #include "cf_defs.h" |
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| 12 | #include "ffops.h" |
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| 13 | |
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| 14 | VAR int ff_prime = 0; |
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| 15 | VAR int ff_halfprime = 0; |
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| 16 | VAR bool ff_big = false; |
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| 17 | VAR short * ff_invtab = new short [32767]; |
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| 18 | |
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| 19 | void ff_setprime ( const int p ) |
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| 20 | { |
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| 21 | if ( p != ff_prime ) |
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| 22 | { |
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| 23 | ff_prime = p; |
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| 24 | ff_halfprime = ff_prime / 2; |
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| 25 | if ( ! ff_big ) |
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| 26 | memset( ff_invtab, 0, ff_prime*sizeof(short) ); |
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| 27 | } |
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| 28 | } |
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| 29 | |
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| 30 | int ff_newinv ( const int a ) |
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| 31 | { |
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| 32 | if (a < 2) |
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| 33 | return (ff_invtab[a] = a); |
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| 34 | int p, q, r1, r2, y1, y2; |
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| 35 | r1 = p = ff_prime; |
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| 36 | q = r1 / a; |
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| 37 | y1 = -q; |
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| 38 | r1 -= a * q; |
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| 39 | if (r1 == 1) |
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| 40 | { |
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| 41 | y1 += p; |
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| 42 | ff_invtab[y1] = a; |
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| 43 | return (ff_invtab[a] = y1); |
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| 44 | } |
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| 45 | r2 = a; |
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| 46 | y2 = 1; |
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| 47 | for (;;) |
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| 48 | { |
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| 49 | q = r2 / r1; |
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| 50 | y2 -= y1 * q; |
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| 51 | r2 -= r1 * q; |
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| 52 | if (r2 == 1) |
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| 53 | { |
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| 54 | if (y2 < 0) |
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| 55 | y2 += p; |
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| 56 | ff_invtab[y2] = a; |
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| 57 | return (ff_invtab[a] = y2); |
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| 58 | } |
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| 59 | q = r1 / r2; |
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| 60 | y1 -= y2 * q; |
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| 61 | r1 -= r2 * q; |
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| 62 | if (r1 == 1) |
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| 63 | { |
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| 64 | if (y1 < 0) |
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| 65 | y1 += p; |
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| 66 | ff_invtab[y1] = a; |
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| 67 | return (ff_invtab[a] = y1); |
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| 68 | } |
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| 69 | } |
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| 70 | } |
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| 71 | |
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| 72 | int ff_biginv ( const int a ) |
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| 73 | { |
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| 74 | if (a < 2) |
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| 75 | return a; |
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| 76 | int p, q, r1, r2, y1, y2; |
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| 77 | r1 = p = ff_prime; |
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| 78 | q = r1 / a; |
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| 79 | y1 = -q; |
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| 80 | r1 -= a * q; |
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| 81 | if (r1 == 1) |
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| 82 | return p + y1; |
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| 83 | r2 = a; |
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| 84 | y2 = 1; |
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| 85 | for (;;) |
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| 86 | { |
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| 87 | q = r2 / r1; |
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| 88 | y2 -= y1 * q; |
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| 89 | r2 -= r1 * q; |
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| 90 | if (r2 == 1) |
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| 91 | { |
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| 92 | if (y2 > 0) |
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| 93 | return y2; |
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| 94 | else |
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| 95 | return p + y2; |
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| 96 | } |
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| 97 | q = r1 / r2; |
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| 98 | y1 -= y2 * q; |
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| 99 | r1 -= r2 * q; |
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| 100 | if (r1 == 1) |
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| 101 | { |
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| 102 | if (y1 > 0) |
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| 103 | return y1; |
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| 104 | else |
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| 105 | return p + y1; |
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| 106 | } |
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| 107 | } |
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| 108 | } |
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