1 files changed, 30 insertions, 0 deletions
diff --git a/math/w_log2f.c b/math/w_log2f.c
new file mode 100644
index 0000000000..ec8d297161
--- /dev/null
+++ b/math/w_log2f.c
@@ -0,0 +1,30 @@
+/*
+ * wrapper log2(X)
+ */
+
+#include <math.h>
+#include "math_private.h"
+
+float
+__log2f (float x)	/* wrapper log2f */
+{
+#ifdef _IEEE_LIBM
+  return __ieee754_log2f (x);
+#else
+  float z;
+  z = __ieee754_log2f (x);
+  if (_LIB_VERSION == _IEEE_ || __isnanf (x)) return z;
+  if (x <= 0.0f)
+    {
+      if (x == 0.0f)
+	/* log2f (0) */
+	return __kernel_standard ((double) x, (double) x, 148);
+      else
+	/* log2f (x < 0) */
+	return __kernel_standard ((double) x, (double) x, 149);
+    }
+  else
+    return z;
+#endif
+}
+weak_alias (__log2f, log2f)