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a493d448 KB |
1 | /*- |
2 | * %sccs.include.proprietary.c% | |
3 | */ | |
4 | ||
051b1e55 | 5 | #ifndef lint |
ffe68dc9 | 6 | static char sccsid[] = "@(#)gcd.c 8.1 (Berkeley) %G%"; |
a493d448 | 7 | #endif /* not lint */ |
c3a0d10b SL |
8 | |
9 | #include <mp.h> | |
10 | gcd(a,b,c) MINT *a,*b,*c; | |
11 | { MINT x,y,z,w; | |
12 | x.len=y.len=z.len=w.len=0; | |
13 | move(a,&x); | |
14 | move(b,&y); | |
15 | while(y.len!=0) | |
16 | { mdiv(&x,&y,&w,&z); | |
17 | move(&y,&x); | |
18 | move(&z,&y); | |
19 | } | |
20 | move(&x,c); | |
21 | xfree(&x); | |
22 | xfree(&y); | |
23 | xfree(&z); | |
24 | xfree(&w); | |
25 | return; | |
26 | } | |
27 | invert(a, b, c) MINT *a, *b, *c; | |
28 | { MINT x, y, z, w, Anew, Aold; | |
29 | int i = 0; | |
30 | x.len = y.len = z.len = w.len = Aold.len = 0; | |
31 | Anew.len = 1; | |
39120317 | 32 | Anew.val = xalloc(1, "invert"); |
c3a0d10b SL |
33 | *Anew.val = 1; |
34 | move(b, &x); | |
35 | move(a, &y); | |
36 | while(y.len != 0) | |
37 | { mdiv(&x, &y, &w, &z); | |
38 | move(&Anew, &x); | |
39 | mult(&w, &Anew, &Anew); | |
40 | madd(&Anew, &Aold, &Anew); | |
41 | move(&x, &Aold); | |
42 | move(&y, &x); | |
43 | move(&z, &y); | |
44 | i++; | |
45 | } | |
46 | move(&Aold, c); | |
47 | if( (i&01) == 0) msub(b, c, c); | |
48 | xfree(&x); | |
49 | xfree(&y); | |
50 | xfree(&z); | |
51 | xfree(&w); | |
52 | xfree(&Aold); | |
53 | xfree(&Anew); | |
54 | } |