zxor.c - libzahl - big integer library
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       ---
       zxor.c (984B)
       ---
            1 /* See LICENSE file for copyright and license details. */
            2 #include "internals.h"
            3 
            4 
            5 void
            6 zxor(z_t a, z_t b, z_t c)
            7 {
            8         size_t n, m, bn, cn;
            9         const zahl_char_t *restrict bc;
           10         const zahl_char_t *restrict cc;
           11 
           12         if (unlikely(zzero(b))) {
           13                 SET(a, c);
           14                 return;
           15         } else if (unlikely(zzero(c))) {
           16                 SET(a, b);
           17                 return;
           18         }
           19 
           20         bn = b->used;
           21         bc = b->chars;
           22         cn = c->used;
           23         cc = c->chars;
           24 
           25         MIN_MAX_1(n, m, bn, cn);
           26         ENSURE_SIZE(a, m);
           27 
           28         if (a == b) {
           29                 ZMEM_2OP_PRECISE(a->chars, a->chars, cc, n, ^);
           30                 if (a->used < cn)
           31                         zmemcpy_range(a->chars, cc, n, m);
           32         } else if (unlikely(a == c)) {
           33                 ZMEM_2OP_PRECISE(a->chars, a->chars, bc, n, ^);
           34                 if (a->used < bn)
           35                         zmemcpy_range(a->chars, bc, n, m);
           36         } else if (m == bn) {
           37                 ZMEM_2OP(a->chars, c->chars, b->chars, n, ^);
           38                 zmemcpy_range(a->chars, b->chars, n, m);
           39         } else {
           40                 ZMEM_2OP(a->chars, b->chars, c->chars, n, ^);
           41                 zmemcpy_range(a->chars, c->chars, n, m);
           42         }
           43 
           44         a->used = m;
           45         TRIM_AND_SIGN(a, 1 - 2 * ((zsignum(b) ^ zsignum(c)) < 0));
           46 }