--- /dev/null
+/* mpz_lcm -- mpz/mpz least common multiple.
+
+Copyright 1996, 2000, 2001, 2005 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 3 of the License, or (at your
+option) any later version.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with the GNU MP Library. If not, see http://www.gnu.org/licenses/. */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+#include "longlong.h"
+
+
+void
+mpz_lcm (mpz_ptr r, mpz_srcptr u, mpz_srcptr v)
+{
+ mpz_t g;
+ mp_size_t usize, vsize, size;
+ TMP_DECL;
+
+ usize = SIZ (u);
+ vsize = SIZ (v);
+ if (usize == 0 || vsize == 0)
+ {
+ SIZ (r) = 0;
+ return;
+ }
+ usize = ABS (usize);
+ vsize = ABS (vsize);
+
+ if (vsize == 1)
+ {
+ mp_limb_t vl, gl, c;
+ mp_srcptr up;
+ mp_ptr rp;
+
+ one:
+ MPZ_REALLOC (r, usize+1);
+
+ up = PTR(u);
+ vl = PTR(v)[0];
+ gl = mpn_gcd_1 (up, usize, vl);
+ vl /= gl;
+
+ rp = PTR(r);
+ c = mpn_mul_1 (rp, up, usize, vl);
+ rp[usize] = c;
+ usize += (c != 0);
+ SIZ(r) = usize;
+ return;
+ }
+
+ if (usize == 1)
+ {
+ usize = vsize;
+ MPZ_SRCPTR_SWAP (u, v);
+ goto one;
+ }
+
+ TMP_MARK;
+ size = MAX (usize, vsize);
+ MPZ_TMP_INIT (g, size);
+
+ mpz_gcd (g, u, v);
+ mpz_divexact (g, u, g);
+ mpz_mul (r, g, v);
+
+ SIZ (r) = ABS (SIZ (r)); /* result always positive */
+
+ TMP_FREE;
+}