From 74f45ae2a723107adce1038a708d2958aca97487 Mon Sep 17 00:00:00 2001
From: Martin Braun <martin.braun@ettus.com>
Date: Mon, 22 Jan 2018 09:54:46 -0800
Subject: rfnoc: Factor out ceil_log2() into central location

- New file: uhdlib/utils/math.hpp
---
 host/lib/rfnoc/duc_block_ctrl_impl.cpp | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

(limited to 'host/lib/rfnoc/duc_block_ctrl_impl.cpp')

diff --git a/host/lib/rfnoc/duc_block_ctrl_impl.cpp b/host/lib/rfnoc/duc_block_ctrl_impl.cpp
index 0e1521d9f..c8989d65c 100644
--- a/host/lib/rfnoc/duc_block_ctrl_impl.cpp
+++ b/host/lib/rfnoc/duc_block_ctrl_impl.cpp
@@ -9,18 +9,14 @@
 #include <uhd/utils/log.hpp>
 #include <uhd/convert.hpp>
 #include <uhd/types/ranges.hpp>
-#include <uhdlib/utils/narrow.hpp>
 #include <uhdlib/utils/compat_check.hpp>
+#include <uhdlib/utils/math.hpp>
+#include <uhdlib/utils/narrow.hpp>
 #include <boost/math/special_functions/round.hpp>
 #include <cmath>
 
 using namespace uhd::rfnoc;
 
-// TODO move this to a central location
-template <class T> T ceil_log2(T num){
-    return std::ceil(std::log(num)/std::log(T(2)));
-}
-
 // TODO remove this once we have actual lambdas
 static double lambda_forward_prop(uhd::property_tree::sptr tree, uhd::fs_path prop, double value)
 {
@@ -250,7 +246,8 @@ private:
         // This must also encompass the CORDIC gain
         static const double CONSTANT_GAIN = 1.1644;
 
-        const double scaling_adjustment = std::pow(2, ceil_log2(rate_pow))/(CONSTANT_GAIN*rate_pow);
+        const double scaling_adjustment =
+            std::pow(2, uhd::math::ceil_log2(rate_pow))/(CONSTANT_GAIN*rate_pow);
         update_scalar(scaling_adjustment, chan);
         return output_rate/interp_rate;
     }
-- 
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