zor.c - libzahl - big integer library
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       ---
       zor.c (878B)
       ---
            1 /* See LICENSE file for copyright and license details. */
            2 #include "internals.h"
            3 
            4 
            5 void
            6 zor(z_t a, z_t b, z_t c)
            7 {
            8         size_t n, m;
            9 
           10         if (unlikely(zzero(b))) {
           11                 SET(a, c);
           12                 return;
           13         } else if (unlikely(zzero(c))) {
           14                 SET(a, b);
           15                 return;
           16         }
           17 
           18         MIN_MAX_1(n, m, b->used, c->used);
           19         ENSURE_SIZE(a, m);
           20 
           21         if (a == b) {
           22                 ZMEM_2OP_PRECISE(a->chars, a->chars, c->chars, n, |);
           23                 if (a->used < c->used)
           24                         zmemcpy_range(a->chars, c->chars, n, m);
           25         } else if (unlikely(a == c)) {
           26                 ZMEM_2OP_PRECISE(a->chars, a->chars, b->chars, n, |);
           27                 if (a->used < b->used)
           28                         zmemcpy_range(a->chars, b->chars, n, m);
           29         } else  if (m == b->used) {
           30                 ZMEM_2OP(a->chars, c->chars, b->chars, n, |);
           31                 zmemcpy_range(a->chars, b->chars, n, m);
           32         } else {
           33                 ZMEM_2OP(a->chars, b->chars, c->chars, n, |);
           34                 zmemcpy_range(a->chars, c->chars, n, m);
           35         }
           36 
           37         a->used = m;
           38         SET_SIGNUM(a, zpositive2(b, c) * 2 - 1);
           39 }