55 lines
783 B
C
55 lines
783 B
C
|
#include "os.h"
|
||
|
|
#include <mp.h>
|
||
|
|
#include "dat.h"
|
||
|
|
|
||
|
|
// sum = abs(b1) + abs(b2), i.e., add the magnitudes
|
||
|
|
void
|
||
|
|
mpmagadd(mpint *b1, mpint *b2, mpint *sum)
|
||
|
|
{
|
||
|
|
int m, n;
|
||
|
|
mpint *t;
|
||
|
|
|
||
|
|
// get the sizes right
|
||
|
|
if(b2->top > b1->top){
|
||
|
|
t = b1;
|
||
|
|
b1 = b2;
|
||
|
|
b2 = t;
|
||
|
|
}
|
||
|
|
n = b1->top;
|
||
|
|
m = b2->top;
|
||
|
|
if(n == 0){
|
||
|
|
mpassign(mpzero, sum);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
if(m == 0){
|
||
|
|
mpassign(b1, sum);
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
mpbits(sum, (n+1)*Dbits);
|
||
|
|
sum->top = n+1;
|
||
|
|
|
||
|
|
mpvecadd(b1->p, n, b2->p, m, sum->p);
|
||
|
|
sum->sign = 1;
|
||
|
|
|
||
|
|
mpnorm(sum);
|
||
|
|
}
|
||
|
|
|
||
|
|
// sum = b1 + b2
|
||
|
|
void
|
||
|
|
mpadd(mpint *b1, mpint *b2, mpint *sum)
|
||
|
|
{
|
||
|
|
int sign;
|
||
|
|
|
||
|
|
if(b1->sign != b2->sign){
|
||
|
|
if(b1->sign < 0)
|
||
|
|
mpmagsub(b2, b1, sum);
|
||
|
|
else
|
||
|
|
mpmagsub(b1, b2, sum);
|
||
|
|
} else {
|
||
|
|
sign = b1->sign;
|
||
|
|
mpmagadd(b1, b2, sum);
|
||
|
|
if(sum->top != 0)
|
||
|
|
sum->sign = sign;
|
||
|
|
}
|
||
|
|
}
|