From 27aa985f450a7d2312f8731991d4e4e9ec122e8d Mon Sep 17 00:00:00 2001
From: Martin Braun <martin.braun@ettus.com>
Date: Thu, 23 Oct 2014 18:07:07 +0200
Subject: math: Added a portable log2()

---
 host/include/uhd/utils/math.hpp | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

(limited to 'host/include')

diff --git a/host/include/uhd/utils/math.hpp b/host/include/uhd/utils/math.hpp
index 21825c3dc..a41a35d67 100644
--- a/host/include/uhd/utils/math.hpp
+++ b/host/include/uhd/utils/math.hpp
@@ -18,11 +18,11 @@
 #ifndef INCLUDED_UHD_UTILS_MATH_HPP
 #define INCLUDED_UHD_UTILS_MATH_HPP
 
+#include <cmath>
 #include <uhd/config.hpp>
 #include <boost/cstdint.hpp>
 #include <boost/numeric/conversion/bounds.hpp>
 
-
 namespace uhd {
 
 /*!
@@ -237,6 +237,16 @@ namespace fp_compare {
                 == fp_compare::fp_compare_delta<double>(rhs, FREQ_COMPARISON_DELTA_HZ));
     }
 
+    //! Portable log2()
+    template <typename float_t> UHD_INLINE
+    float_t log2(float_t x)
+    {
+        // C++11 defines std::log2(), when that's universally supported
+        // we can switch over.
+        return std::log(x) / std::log(2);
+    }
+
+
 } // namespace math
 } // namespace uhd
 
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