1 files changed, 88 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/dbl-64/e_cosh.c b/REORG.TODO/sysdeps/ieee754/dbl-64/e_cosh.c
new file mode 100644
index 0000000000..52a5d5007d
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+++ b/REORG.TODO/sysdeps/ieee754/dbl-64/e_cosh.c
@@ -0,0 +1,88 @@
+/* Optimized by Ulrich Drepper <drepper@gmail.com>, 2011 */
+/*
+ * ====================================================
+ * 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.
+ * ====================================================
+ */
+
+/* __ieee754_cosh(x)
+ * Method :
+ * mathematically cosh(x) if defined to be (exp(x)+exp(-x))/2
+ *	1. Replace x by |x| (cosh(x) = cosh(-x)).
+ *	2.
+ *							[ exp(x) - 1 ]^2
+ *	    0        <= x <= ln2/2  :  cosh(x) := 1 + -------------------
+ *							   2*exp(x)
+ *
+ *						  exp(x) +  1/exp(x)
+ *	    ln2/2    <= x <= 22     :  cosh(x) := -------------------
+ *							  2
+ *	    22       <= x <= lnovft :  cosh(x) := exp(x)/2
+ *	    lnovft   <= x <= ln2ovft:  cosh(x) := exp(x/2)/2 * exp(x/2)
+ *	    ln2ovft  <  x	    :  cosh(x) := huge*huge (overflow)
+ *
+ * Special cases:
+ *	cosh(x) is |x| if x is +INF, -INF, or NaN.
+ *	only cosh(0)=1 is exact for finite x.
+ */
+
+#include <math.h>
+#include <math_private.h>
+
+static const double one = 1.0, half = 0.5, huge = 1.0e300;
+
+double
+__ieee754_cosh (double x)
+{
+  double t, w;
+  int32_t ix;
+  u_int32_t lx;
+
+  /* High word of |x|. */
+  GET_HIGH_WORD (ix, x);
+  ix &= 0x7fffffff;
+
+  /* |x| in [0,22] */
+  if (ix < 0x40360000)
+    {
+      /* |x| in [0,0.5*ln2], return 1+expm1(|x|)^2/(2*exp(|x|)) */
+      if (ix < 0x3fd62e43)
+	{
+	  if (ix < 0x3c800000)
+	    return one;                                   /* cosh(tiny) = 1 */
+	  t = __expm1 (fabs (x));
+	  w = one + t;
+	  return one + (t * t) / (w + w);
+	}
+
+      /* |x| in [0.5*ln2,22], return (exp(|x|)+1/exp(|x|)/2; */
+      t = __ieee754_exp (fabs (x));
+      return half * t + half / t;
+    }
+
+  /* |x| in [22, log(maxdouble)] return half*exp(|x|) */
+  if (ix < 0x40862e42)
+    return half * __ieee754_exp (fabs (x));
+
+  /* |x| in [log(maxdouble), overflowthresold] */
+  GET_LOW_WORD (lx, x);
+  if (ix < 0x408633ce || ((ix == 0x408633ce) && (lx <= (u_int32_t) 0x8fb9f87d)))
+    {
+      w = __ieee754_exp (half * fabs (x));
+      t = half * w;
+      return t * w;
+    }
+
+  /* x is INF or NaN */
+  if (ix >= 0x7ff00000)
+    return x * x;
+
+  /* |x| > overflowthresold, cosh(x) overflow */
+  return math_narrow_eval (huge * huge);
+}
+strong_alias (__ieee754_cosh, __cosh_finite)