Commit | Line | Data |
---|---|---|
c3a0d10b SL |
1 | /* @(#)gcd.c 4.1 %G% */ |
2 | ||
3 | #include <mp.h> | |
4 | gcd(a,b,c) MINT *a,*b,*c; | |
5 | { MINT x,y,z,w; | |
6 | x.len=y.len=z.len=w.len=0; | |
7 | move(a,&x); | |
8 | move(b,&y); | |
9 | while(y.len!=0) | |
10 | { mdiv(&x,&y,&w,&z); | |
11 | move(&y,&x); | |
12 | move(&z,&y); | |
13 | } | |
14 | move(&x,c); | |
15 | xfree(&x); | |
16 | xfree(&y); | |
17 | xfree(&z); | |
18 | xfree(&w); | |
19 | return; | |
20 | } | |
21 | invert(a, b, c) MINT *a, *b, *c; | |
22 | { MINT x, y, z, w, Anew, Aold; | |
23 | int i = 0; | |
24 | x.len = y.len = z.len = w.len = Aold.len = 0; | |
25 | Anew.len = 1; | |
26 | Anew.val = xalloc(1); | |
27 | *Anew.val = 1; | |
28 | move(b, &x); | |
29 | move(a, &y); | |
30 | while(y.len != 0) | |
31 | { mdiv(&x, &y, &w, &z); | |
32 | move(&Anew, &x); | |
33 | mult(&w, &Anew, &Anew); | |
34 | madd(&Anew, &Aold, &Anew); | |
35 | move(&x, &Aold); | |
36 | move(&y, &x); | |
37 | move(&z, &y); | |
38 | i++; | |
39 | } | |
40 | move(&Aold, c); | |
41 | if( (i&01) == 0) msub(b, c, c); | |
42 | xfree(&x); | |
43 | xfree(&y); | |
44 | xfree(&z); | |
45 | xfree(&w); | |
46 | xfree(&Aold); | |
47 | xfree(&Anew); | |
48 | } |