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authorJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
committerJakub Jelinek <jakub@redhat.com>2007-07-12 18:26:36 +0000
commit0ecb606cb6cf65de1d9fc8a919bceb4be476c602 (patch)
tree2ea1f8305970753e4a657acb2ccc15ca3eec8e2c /math/w_exp2f.c
parent7d58530341304d403a6626d7f7a1913165fe2f32 (diff)
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2.5-18.1
Diffstat (limited to 'math/w_exp2f.c')
-rw-r--r--math/w_exp2f.c32
1 files changed, 32 insertions, 0 deletions
diff --git a/math/w_exp2f.c b/math/w_exp2f.c
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+++ b/math/w_exp2f.c
@@ -0,0 +1,32 @@
+/*
+ * wrapper exp2f(x)
+ */
+
+#include <float.h>
+#include <math.h>
+#include "math_private.h"
+
+static const float o_threshold= (float) FLT_MAX_EXP;
+static const float u_threshold= (float) (FLT_MIN_EXP - FLT_MANT_DIG - 1);
+
+float
+__exp2f (float x)		/* wrapper exp2f */
+{
+#ifdef _IEEE_LIBM
+  return __ieee754_exp2f (x);
+#else
+  float z;
+  z = __ieee754_exp2f (x);
+  if (_LIB_VERSION != _IEEE_ && __finitef (x))
+    {
+      if (x > o_threshold)
+	/* exp2 overflow */
+	return (float) __kernel_standard ((double) x, (double) x, 144);
+      else if (x <= u_threshold)
+	/* exp2 underflow */
+	return (float) __kernel_standard ((double) x, (double) x, 145);
+    }
+  return z;
+#endif
+}
+weak_alias (__exp2f, exp2f)