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diff --git a/contrib/libgmp/mpz/perfsqr.c b/contrib/libgmp/mpz/perfsqr.c
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+/* mpz_perfect_square_p(arg) -- Return non-zero if ARG is a perfect square,
+ zero otherwise.
+
+Copyright (C) 1991, 1993, 1994, 1996 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 Library General Public License as published by
+the Free Software Foundation; either version 2 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 Library General Public
+License for more details.
+
+You should have received a copy of the GNU Library General Public License
+along with the GNU MP Library; see the file COPYING.LIB. If not, write to
+the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+MA 02111-1307, USA. */
+
+#include "gmp.h"
+#include "gmp-impl.h"
+
+int
+#if __STDC__
+mpz_perfect_square_p (mpz_srcptr a)
+#else
+mpz_perfect_square_p (a)
+ mpz_srcptr a;
+#endif
+{
+ mp_size_t asize = a->_mp_size;
+
+ /* No negative numbers are perfect squares. */
+ if (asize < 0)
+ return 0;
+
+ return mpn_perfect_square_p (a->_mp_d, asize);
+}
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