/* -*-c-*-
*
- * $Id: mp-arith.c,v 1.8 2000/10/08 12:02:21 mdw Exp $
+ * $Id: mp-arith.c,v 1.10 2001/04/03 19:36:05 mdw Exp $
*
* Basic arithmetic on multiprecision integers
*
/*----- Revision history --------------------------------------------------*
*
* $Log: mp-arith.c,v $
+ * Revision 1.10 2001/04/03 19:36:05 mdw
+ * Add some simple bitwise operations so that Perl can use them.
+ *
+ * Revision 1.9 2000/10/08 15:48:35 mdw
+ * Rename Karatsuba constants now that we have @gfx_kmul@ too.
+ *
* Revision 1.8 2000/10/08 12:02:21 mdw
* Use @MP_EQ@ instead of @MP_CMP@.
*
return (+1);
}
+/* --- @mpx_and@, @mpx_or@, @mpx_xor@, @mpx_not@ --- *
+ *
+ * Arguments: @mp *d@ = destination
+ * @mp *a, *b@ = sources
+ *
+ * Returns: The result of the obvious bitwise operation.
+ */
+
+#define MP_BITBINOP(name) \
+ \
+mp *mp_##name(mp *d, mp *a, mp *b) \
+{ \
+ MP_DEST(d, MAX(MP_LEN(a), MP_LEN(b)), a->f | b->f); \
+ mpx_##name(d->v, d->vl, a->v, a->vl, b->v, b->vl); \
+ d->f = (a->f | b->f) & MP_BURN; \
+ MP_SHRINK(d); \
+ return (d); \
+}
+
+MP_BITBINOP(and)
+MP_BITBINOP(or)
+MP_BITBINOP(xor)
+
+mp *mp_not(mp *d, mp *a)
+{
+ MP_DEST(d, MP_LEN(a), a->f);
+ mpx_not(d->v, d->vl, a->v, a->vl);
+ d->f = a->f & MP_BURN;
+ MP_SHRINK(d);
+ return (d);
+}
+
/* --- @mp_add@ --- *
*
* Arguments: @mp *d@ = destination
a = MP_COPY(a);
b = MP_COPY(b);
- if (MP_LEN(a) <= KARATSUBA_CUTOFF || MP_LEN(b) <= KARATSUBA_CUTOFF) {
+ if (MP_LEN(a) <= MPK_THRESH || MP_LEN(b) <= MPK_THRESH) {
MP_DEST(d, MP_LEN(a) + MP_LEN(b), a->f | b->f | MP_UNDEF);
mpx_umul(d->v, d->vl, a->v, a->vl, b->v, b->vl);
} else {
size_t m = 2 * MAX(MP_LEN(a), MP_LEN(b)) + 2;
mpw *s;
MP_DEST(d, m, a->f | b->f | MP_UNDEF);
- m += KARATSUBA_SLOP;
+ m += MPK_SLOP;
s = mpalloc(d->a, m);
mpx_kmul(d->v, d->vl, a->v, a->vl, b->v, b->vl, s, s + m);
mpfree(d->a, s);
a = MP_COPY(a);
MP_DEST(d, 2 * m + 2, a->f | MP_UNDEF);
- if (m > KARATSUBA_CUTOFF) {
+ if (m > MPK_THRESH) {
mpw *s;
- m = 2 * (m + 1) + KARATSUBA_SLOP;
+ m = 2 * (m + 1) + MPK_SLOP;
s = mpalloc(d->a, m);
mpx_ksqr(d->v, d->vl, a->v, a->vl, s, s + m);
mpfree(d->a, s);