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-rw-r--r--math/w_log2f.c30
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)