IVGCVSW-5685 Add CpuAcc specific configuration option numberOfThreads

 * Added --number-of-threads command line option to android-nn-driver

!armnn:5068

Signed-off-by: Matthew Sloyan <matthew.sloyan@arm.com>
Change-Id: I248326bf3c0355a7a17b70cb1aac7b7976820c12
diff --git a/DriverOptions.cpp b/DriverOptions.cpp
index c30a440..3f9b76e 100644
--- a/DriverOptions.cpp
+++ b/DriverOptions.cpp
@@ -38,6 +38,7 @@
     , m_FastMathEnabled(false)
     , m_ShouldExit(false)
     , m_SaveCachedNetwork(false)
+    , m_NumberOfThreads(0)
 {
 }
 
@@ -51,6 +52,7 @@
     , m_FastMathEnabled(false)
     , m_ShouldExit(false)
     , m_SaveCachedNetwork(false)
+    , m_NumberOfThreads(0)
 {
 }
 
@@ -63,6 +65,7 @@
     , m_FastMathEnabled(false)
     , m_ShouldExit(false)
     , m_SaveCachedNetwork(false)
+    , m_NumberOfThreads(0)
 {
     std::string unsupportedOperationsAsString;
     std::string clTunedParametersModeAsString;
@@ -127,6 +130,12 @@
                                   " See also --cached-network-file",
         cxxopts::value<bool>(m_SaveCachedNetwork)->default_value("false"))
 
+        ("number-of-threads",
+         "Assign the number of threads used by the CpuAcc backend. "
+         "Input value must be between 1 and 64. "
+         "Default is set to 0 (Backend will decide number of threads to use).",
+         cxxopts::value<unsigned int>(m_NumberOfThreads)->default_value("0"))
+
         ("t,cl-tuned-parameters-file",
          "If non-empty, the given file will be used to load/save CL tuned parameters. "
          "See also --cl-tuned-parameters-mode",