#include "os.h"#include <mp.h>#include "dat.h" // sum = abs(b1) + abs(b2), i.e., add the magnitudesvoidmpmagadd(mpint *b1, mpint *b2, mpint *sum){ int m, n; mpint *t; sum->flags |= (b1->flags | b2->flags) & MPtimesafe; // 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); sum->sign = 1; 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 + b2voidmpadd(mpint *b1, mpint *b2, mpint *sum){ int sign; if(b1->sign != b2->sign){ assert(((b1->flags | b2->flags | sum->flags) & MPtimesafe) == 0); 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; }}
#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;
sum->flags |= (b1->flags | b2->flags) & MPtimesafe;
// 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);
sum->sign = 1;
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){
assert(((b1->flags | b2->flags | sum->flags) & MPtimesafe) == 0);
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;
}
}