1 files changed, 72 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/dbl-64/s_asinh.c b/REORG.TODO/sysdeps/ieee754/dbl-64/s_asinh.c
new file mode 100644
index 0000000000..9193301b5e
--- /dev/null
+++ b/REORG.TODO/sysdeps/ieee754/dbl-64/s_asinh.c
@@ -0,0 +1,72 @@
+/* @(#)s_asinh.c 5.1 93/09/24 */
+/*
+ * ====================================================
+ * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
+ *
+ * Developed at SunPro, a Sun Microsystems, Inc. business.
+ * Permission to use, copy, modify, and distribute this
+ * software is freely granted, provided that this notice
+ * is preserved.
+ * ====================================================
+ */
+
+/* asinh(x)
+ * Method :
+ *	Based on
+ *		asinh(x) = sign(x) * log [ |x| + sqrt(x*x+1) ]
+ *	we have
+ *	asinh(x) := x  if  1+x*x=1,
+ *		 := sign(x)*(log(x)+ln2)) for large |x|, else
+ *		 := sign(x)*log(2|x|+1/(|x|+sqrt(x*x+1))) if|x|>2, else
+ *		 := sign(x)*log1p(|x| + x^2/(1 + sqrt(1+x^2)))
+ */
+
+#include <float.h>
+#include <math.h>
+#include <math_private.h>
+
+static const double
+  one = 1.00000000000000000000e+00, /* 0x3FF00000, 0x00000000 */
+  ln2 = 6.93147180559945286227e-01, /* 0x3FE62E42, 0xFEFA39EF */
+  huge = 1.00000000000000000000e+300;
+
+double
+__asinh (double x)
+{
+  double w;
+  int32_t hx, ix;
+  GET_HIGH_WORD (hx, x);
+  ix = hx & 0x7fffffff;
+  if (__glibc_unlikely (ix < 0x3e300000))                  /* |x|<2**-28 */
+    {
+      math_check_force_underflow (x);
+      if (huge + x > one)
+	return x;                       /* return x inexact except 0 */
+    }
+  if (__glibc_unlikely (ix > 0x41b00000))                  /* |x| > 2**28 */
+    {
+      if (ix >= 0x7ff00000)
+	return x + x;                           /* x is inf or NaN */
+      w = __ieee754_log (fabs (x)) + ln2;
+    }
+  else
+    {
+      double xa = fabs (x);
+      if (ix > 0x40000000)              /* 2**28 > |x| > 2.0 */
+	{
+	  w = __ieee754_log (2.0 * xa + one / (__ieee754_sqrt (xa * xa + one) +
+              xa));
+	}
+      else                      /* 2.0 > |x| > 2**-28 */
+	{
+	  double t = xa * xa;
+	  w = __log1p (xa + t / (one + __ieee754_sqrt (one + t)));
+	}
+    }
+  return __copysign (w, x);
+}
+weak_alias (__asinh, asinh)
+#ifdef NO_LONG_DOUBLE
+strong_alias (__asinh, __asinhl)
+weak_alias (__asinh, asinhl)
+#endif