1 files changed, 63 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/dbl-64/mptan.c b/REORG.TODO/sysdeps/ieee754/dbl-64/mptan.c
new file mode 100644
index 0000000000..6976028f8f
--- /dev/null
+++ b/REORG.TODO/sysdeps/ieee754/dbl-64/mptan.c
@@ -0,0 +1,63 @@
+/*
+ * IBM Accurate Mathematical Library
+ * written by International Business Machines Corp.
+ * Copyright (C) 2001-2017 Free Software Foundation, Inc.
+ *
+ * This program 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 2.1 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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 this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+/**********************************************************************/
+/* MODULE_NAME:mptan.c                                                */
+/*                                                                    */
+/* FUNCTION: mptan                                                    */
+/*                                                                    */
+/* FILES NEEDED: endian.h  mpa.h                                      */
+/*               mpa.c  sincos32.c branred.c                          */
+/*                                                                    */
+/* Multi-Precision tan() function subroutine, for p=32.  It is based  */
+/* on the routines mpranred() and c32(). mpranred() performs range    */
+/* reduction of a double number x into a multiple precision number    */
+/* y, such that y=x-n*pi/2, abs(y)<pi/4, n=0,+-1,+-2,....  c32()      */
+/* computes both sin(y), cos(y).  tan(x) is either sin(y)/cos(y)      */
+/* or -cos(y)/sin(y). The precision of the result is of about 559     */
+/* significant bits.                                                  */
+/*                                                                    */
+/**********************************************************************/
+#include "endian.h"
+#include "mpa.h"
+
+#ifndef SECTION
+# define SECTION
+#endif
+
+void
+SECTION
+__mptan (double x, mp_no *mpy, int p)
+{
+  int n;
+  mp_no mpw, mpc, mps;
+
+  /* Negative or positive result.  */
+  n = __mpranred (x, &mpw, p) & 0x00000001;
+  /* Computing sin(x) and cos(x).  */
+  __c32 (&mpw, &mpc, &mps, p);
+  /* Second or fourth quarter of unit circle.  */
+  if (n)
+    {
+      __dvd (&mpc, &mps, mpy, p);
+      mpy->d[0] *= -1;
+    }
+  /* tan is negative in this area.  */
+  else
+    __dvd (&mps, &mpc, mpy, p);
+}