jehanne/sys/src/lib/mp/port/mpcmp.c

31 lines
585 B
C

#include "os.h"
#include <mp.h>
#include "dat.h"
// return neg, 0, pos as jehanne_abs(b1)-jehanne_abs(b2) is neg, 0, pos
int
mpmagcmp(mpint *b1, mpint *b2)
{
int i;
i = b1->flags | b2->flags;
if(i & MPtimesafe)
return mpvectscmp(b1->p, b1->top, b2->p, b2->top);
if(i & MPnorm){
i = b1->top - b2->top;
if(i)
return i;
}
return mpveccmp(b1->p, b1->top, b2->p, b2->top);
}
// return neg, 0, pos as b1-b2 is neg, 0, pos
int
mpcmp(mpint *b1, mpint *b2)
{
int sign;
sign = (b1->sign - b2->sign) >> 1; // -1, 0, 1
return sign | (sign&1)-1 & mpmagcmp(b1, b2)*b1->sign;
}