From eef1220d7200c5a67b156e85d8c2fbc5a80ca388 Mon Sep 17 00:00:00 2001
From: Olli <oparviai@iki.fi>
Date: Sun, 2 Dec 2018 22:33:55 +0200
Subject: [PATCH] BPMDetect: Change correlation loop 'sum' variable type from
 double to float, because double causes big performance penalty for
 autovectorized code.

---
 source/SoundTouch/BPMDetect.cpp | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/source/SoundTouch/BPMDetect.cpp b/source/SoundTouch/BPMDetect.cpp
index 3ecda49..5ad1926 100644
--- a/source/SoundTouch/BPMDetect.cpp
+++ b/source/SoundTouch/BPMDetect.cpp
@@ -313,7 +313,7 @@ void BPMDetect::updateXCorr(int process_samples)
     #pragma omp parallel for
     for (offs = windowStart; offs < windowLen; offs ++) 
     {
-        double sum;
+        float sum;
         int i;
 
         sum = 0;
@@ -341,7 +341,6 @@ void BPMDetect::updateBeatPos(int process_samples)
     //    static double thr = 0.0003;
     double posScale = (double)this->decimateBy / (double)this->sampleRate;
     int resetDur = (int)(0.12 / posScale + 0.5);
-    double corrScale = 1.0 / (double)(windowLen - windowStart);
 
     // prescale pbuffer
     float tmp[XCORR_UPDATE_SEQUENCE / 2];
@@ -353,7 +352,7 @@ void BPMDetect::updateBeatPos(int process_samples)
     #pragma omp parallel for
     for (int offs = windowStart; offs < windowLen; offs++)
     {
-        double sum = 0;
+        float sum = 0;
         for (int i = 0; i < process_samples; i++)
         {
             sum += tmp[i] * pBuffer[offs + i];