1 files changed, 37 insertions, 0 deletions
diff --git a/sysdeps/ieee754/copysign.c b/sysdeps/ieee754/copysign.c
new file mode 100644
index 0000000000..f1f0591d5f
--- /dev/null
+++ b/sysdeps/ieee754/copysign.c
@@ -0,0 +1,37 @@
+/* Copyright (C) 1991, 1992, 1995 Free Software Foundation, Inc.
+This file is part of the GNU C Library.
+
+The GNU C 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 C 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 C Library; see the file COPYING.LIB.  If
+not, write to the Free Software Foundation, Inc., 675 Mass Ave,
+Cambridge, MA 02139, USA.  */
+
+#include <ansidecl.h>
+#include <math.h>
+#include "ieee754.h"
+
+/* Return X with its signed changed to Y's.  */
+double
+DEFUN(__copysign, (x, y), double x AND double y)
+{
+  union ieee754_double ux, uy;
+
+  ux.d = x;
+  uy.d = y;
+
+  ux.ieee.negative = uy.ieee.negative;
+
+  return ux.d;
+}
+
+weak_alias (__copysign, copysign)