1 files changed, 45 insertions, 0 deletions
diff --git a/src/common_audio/signal_processing_library/main/source/norm_w32.c b/src/common_audio/signal_processing_library/main/source/norm_w32.c
new file mode 100644
index 0000000000..d45633501a
--- /dev/null
+++ b/src/common_audio/signal_processing_library/main/source/norm_w32.c
@@ -0,0 +1,45 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+
+/*
+ * This file contains the function WebRtcSpl_NormW32().
+ * The description header can be found in signal_processing_library.h
+ *
+ */
+
+#include "signal_processing_library.h"
+
+#ifndef SPL_NO_DOUBLE_IMPLEMENTATIONS
+
+int WebRtcSpl_NormW32(WebRtc_Word32 value)
+{
+    int zeros = 0;
+
+    if (value <= 0)
+        value ^= 0xFFFFFFFF;
+
+    // Fast binary search to determine the number of left shifts required to 32-bit normalize
+    // the value
+    if (!(0xFFFF8000 & value))
+        zeros = 16;
+    if (!(0xFF800000 & (value << zeros)))
+        zeros += 8;
+    if (!(0xF8000000 & (value << zeros)))
+        zeros += 4;
+    if (!(0xE0000000 & (value << zeros)))
+        zeros += 2;
+    if (!(0xC0000000 & (value << zeros)))
+        zeros += 1;
+
+    return zeros;
+}
+
+#endif