1 files changed, 68 insertions, 0 deletions
diff --git a/libc/dfp/sysdeps/ieee754r/d32/asinhd32.c b/libc/dfp/sysdeps/ieee754r/d32/asinhd32.c
new file mode 100644
index 000000000..fddcdd4ab
--- /dev/null
+++ b/libc/dfp/sysdeps/ieee754r/d32/asinhd32.c
@@ -0,0 +1,68 @@
+/* Returns the hyperbolic arc sine of a _Decimal32 type argument
+   Copyright (C) 2006 IBM Corporation.
+
+   Author(s): Pete Eberlein <eberlein@us.ibm.com>
+
+   The Decimal Floating Point C Library is free software; you can
+   redistribute it and/or modify it under the terms of the GNU Lesser
+   General Public License version 2.1.
+
+   The Decimal Floating Point 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 Lesser General Public License version 2.1 for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License version 2.1 along with the Decimal Floating Point C Library;
+   if not, write to the Free Software Foundation, Inc., 59 Temple Place,
+   Suite 330, Boston, MA 02111-1307 USA.
+
+   Please see dfp/COPYING.txt for more information.  */
+
+#ifndef _DECIMAL_SIZE
+#  define _DECIMAL_SIZE 32
+#  include <decimal32.h>
+#endif
+
+#include <decContext.h>
+#include <decNumber.h>
+#include <math.h>
+
+#include <decNumberMath.h>
+
+#define FUNCTION_NAME asinh
+
+#include <dfpmacro.h>
+
+DEC_TYPE
+INTERNAL_FUNCTION_NAME (DEC_TYPE x)
+{
+  decContext context;
+  decNumber dn_result;
+  DEC_TYPE result, one;
+  decNumber dn_x, dn_one;
+
+  one = DFP_CONSTANT(1.0);
+  FUNC_CONVERT_TO_DN (&one, &dn_one);
+  FUNC_CONVERT_TO_DN (&x, &dn_x);
+
+  if (___decNumberIsNaN (&dn_x) || ___decNumberIsZero (&dn_x)
+	|| ___decNumberIsInfinite (&dn_x))
+    {
+      return x + x;
+    }
+  ___decContextDefault (&context, DEFAULT_CONTEXT);
+
+  /* using trig identity: acosh(x) = log(x+sqrt(x*x-1)) */
+  ___decNumberMultiply (&dn_result, &dn_x, &dn_x, &context);
+  ___decNumberAdd (&dn_result, &dn_result, &dn_one, &context);
+  ___decNumberSquareRoot (&dn_result, &dn_result, &context);
+  ___decNumberAdd (&dn_result, &dn_result, &dn_x, &context);
+  ___decNumberLn (&dn_result, &dn_result, &context);
+
+  FUNC_CONVERT_FROM_DN (&dn_result, &result, &context);
+
+  return result;
+}
+
+weak_alias (INTERNAL_FUNCTION_NAME, EXTERNAL_FUNCTION_NAME)