Generic w_exp2l.c.
authordrepper <drepper>
Wed, 14 Dec 2005 11:43:18 +0000 (11:43 +0000)
committerdrepper <drepper>
Wed, 14 Dec 2005 11:43:18 +0000 (11:43 +0000)
math/w_exp2l.c [new file with mode: 0644]

diff --git a/math/w_exp2l.c b/math/w_exp2l.c
new file mode 100644 (file)
index 0000000..fea5425
--- /dev/null
@@ -0,0 +1,31 @@
+/*
+ * wrapper exp2l(x)
+ */
+
+#include <float.h>
+#include <math.h>
+#include "math_private.h"
+
+static const long double o_threshold = (long double) LDBL_MAX_EXP;
+static const long double u_threshold
+  = (long double) (LDBL_MIN_EXP - LDBL_MANT_DIG - 1);
+
+long double
+__exp2l (long double x)                        /* wrapper exp2l */
+{
+#ifdef _IEEE_LIBM
+  return __ieee754_exp2l (x);
+#else
+  long double z;
+  z = __ieee754_exp2l (x);
+  if (_LIB_VERSION != _IEEE_ && __finitel (x))
+    {
+      if (x > o_threshold)
+       return __kernel_standard (x, x, 244); /* exp2l overflow */
+      else if (x <= u_threshold)
+       return __kernel_standard (x, x, 245); /* exp2l underflow */
+    }
+  return z;
+#endif
+}
+weak_alias (__exp2l, exp2l)