1 b3f61791 2004-03-21 devnull #include "os.h"
2 b3f61791 2004-03-21 devnull #include <mp.h>
3 b3f61791 2004-03-21 devnull #include "dat.h"
5 b3f61791 2004-03-21 devnull #define VLDIGITS (sizeof(vlong)/sizeof(mpdigit))
8 b3f61791 2004-03-21 devnull * this code assumes that a vlong is an integral number of
9 b3f61791 2004-03-21 devnull * mpdigits long.
12 b3f61791 2004-03-21 devnull vtomp(vlong v, mpint *b)
15 b3f61791 2004-03-21 devnull uvlong uv;
17 b3f61791 2004-03-21 devnull if(b == nil)
18 b3f61791 2004-03-21 devnull b = mpnew(VLDIGITS*sizeof(mpdigit));
20 b3f61791 2004-03-21 devnull mpbits(b, VLDIGITS*sizeof(mpdigit));
21 b3f61791 2004-03-21 devnull mpassign(mpzero, b);
22 b3f61791 2004-03-21 devnull if(v == 0)
23 b3f61791 2004-03-21 devnull return b;
24 b3f61791 2004-03-21 devnull if(v < 0){
25 b3f61791 2004-03-21 devnull b->sign = -1;
29 b3f61791 2004-03-21 devnull for(s = 0; s < VLDIGITS && uv != 0; s++){
30 b3f61791 2004-03-21 devnull b->p[s] = uv;
31 bcb7f64e 2006-04-20 devnull /* !@*$&!@$ gcc gives warnings about the >> here
32 fa325e9b 2020-01-10 cross * when running on 64-bit machines, even though
33 bcb7f64e 2006-04-20 devnull * it's in dead code. fake it out with two shifts.
34 9e36143a 2005-12-30 devnull if(sizeof(mpdigit) == sizeof(uvlong))
37 9e36143a 2005-12-30 devnull uv >>= sizeof(mpdigit)*8;
39 bcb7f64e 2006-04-20 devnull uv >>= sizeof(mpdigit)*4;
40 bcb7f64e 2006-04-20 devnull uv >>= sizeof(mpdigit)*4;
42 b3f61791 2004-03-21 devnull b->top = s;
43 b3f61791 2004-03-21 devnull return b;
47 b3f61791 2004-03-21 devnull mptov(mpint *b)
49 b3f61791 2004-03-21 devnull uvlong v;
52 b3f61791 2004-03-21 devnull if(b->top == 0)
53 b3f61791 2004-03-21 devnull return 0LL;
55 b3f61791 2004-03-21 devnull mpnorm(b);
56 b3f61791 2004-03-21 devnull if(b->top > VLDIGITS){
57 b3f61791 2004-03-21 devnull if(b->sign > 0)
58 b3f61791 2004-03-21 devnull return (vlong)MAXVLONG;
60 b3f61791 2004-03-21 devnull return (vlong)MINVLONG;
63 b3f61791 2004-03-21 devnull v = 0ULL;
64 b3f61791 2004-03-21 devnull for(s = 0; s < b->top; s++)
65 b3f61791 2004-03-21 devnull v |= b->p[s]<<(s*sizeof(mpdigit)*8);
67 b3f61791 2004-03-21 devnull if(b->sign > 0){
68 b3f61791 2004-03-21 devnull if(v > MAXVLONG)
69 b3f61791 2004-03-21 devnull v = MAXVLONG;
71 b3f61791 2004-03-21 devnull if(v > MINVLONG)
72 b3f61791 2004-03-21 devnull v = MINVLONG;
74 b3f61791 2004-03-21 devnull v = -(vlong)v;
77 b3f61791 2004-03-21 devnull return (vlong)v;