1 files changed, 46 insertions, 0 deletions
diff --git a/StdLib/LibC/Math/w_exp.c b/StdLib/LibC/Math/w_exp.c
new file mode 100644
index 0000000000..29a2bb2906
--- /dev/null
+++ b/StdLib/LibC/Math/w_exp.c
@@ -0,0 +1,46 @@
+/* @(#)w_exp.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.
+ * ====================================================
+ */
+#include  <LibConfig.h>
+#include  <sys/EfiCdefs.h>
+#if defined(LIBM_SCCS) && !defined(lint)
+__RCSID("$NetBSD: w_exp.c,v 1.9 2002/05/26 22:02:00 wiz Exp $");
+#endif
+
+/*
+ * wrapper exp(x)
+ */
+
+#include "math.h"
+#include "math_private.h"
+
+static const double
+o_threshold=  7.09782712893383973096e+02,  /* 0x40862E42, 0xFEFA39EF */
+u_threshold= -7.45133219101941108420e+02;  /* 0xc0874910, 0xD52D3051 */
+
+double
+exp(double x)   /* wrapper exp */
+{
+#ifdef _IEEE_LIBM
+  return __ieee754_exp(x);
+#else
+  double z;
+  z = __ieee754_exp(x);
+  if(_LIB_VERSION == _IEEE_) return z;
+  if(finite(x)) {
+      if(x>o_threshold)
+          return __kernel_standard(x,x,6); /* exp overflow */
+      else if(x<u_threshold)
+          return __kernel_standard(x,x,7); /* exp underflow */
+  }
+  return z;
+#endif
+}