From 7f49fe9feb174d34efc2a011bad79b38522a360b Mon Sep 17 00:00:00 2001
From: Dongdong Li <qqlddg@gmail.com>
Date: Thu, 8 Aug 2013 00:15:58 -0800
Subject: Intesim2 Integration Details: See Review 80001
 https://gpgpu-sim-code-review.appspot.com/80001/

[git-p4: depot-paths = "//depot/gpgpu_sim_research/fermi/distribution/": change = 16747]
---
 src/intersim2/allocators/loa.cpp | 112 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 src/intersim2/allocators/loa.cpp

(limited to 'src/intersim2/allocators/loa.cpp')

diff --git a/src/intersim2/allocators/loa.cpp b/src/intersim2/allocators/loa.cpp
new file mode 100644
index 0000000..c24bbe3
--- /dev/null
+++ b/src/intersim2/allocators/loa.cpp
@@ -0,0 +1,112 @@
+// $Id: loa.cpp 5188 2012-08-30 00:31:31Z dub $
+
+/*
+ Copyright (c) 2007-2012, Trustees of The Leland Stanford Junior University
+ All rights reserved.
+
+ Redistribution and use in source and binary forms, with or without
+ modification, are permitted provided that the following conditions are met:
+
+ Redistributions of source code must retain the above copyright notice, this 
+ list of conditions and the following disclaimer.
+ Redistributions in binary form must reproduce the above copyright notice, this
+ list of conditions and the following disclaimer in the documentation and/or
+ other materials provided with the distribution.
+
+ THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 
+ DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#include "booksim.hpp"
+#include <iostream>
+
+#include "loa.hpp"
+#include "random_utils.hpp"
+
+LOA::LOA( Module *parent, const string& name,
+	  int inputs, int outputs ) :
+  DenseAllocator( parent, name, inputs, outputs )
+{
+  _req.resize(inputs);
+  _counts.resize(outputs);
+
+  _rptr.resize(inputs);
+  _gptr.resize(outputs);
+}
+
+void LOA::Allocate( )
+{
+  int input;
+  int output;
+
+  int input_offset;
+  int output_offset;
+
+  int lonely;
+  int lonely_cnt;
+
+  // Count phase --- the number of requests
+  // per output is counted
+
+  for ( int j = 0; j < _outputs; ++j ) {
+    _counts[j] = 0;
+    for ( int i = 0; i < _inputs; ++i ) {
+      _counts[j] += ( _request[i][j].label != -1 ) ? 1 : 0;
+    }
+  }
+
+  // Request phase
+  for ( input = 0; input < _inputs; ++input ) {
+
+    // Find the lonely output
+    output_offset = _rptr[input];
+    lonely        = -1;
+    lonely_cnt    = _inputs + 1;
+
+    for ( int o = 0; o < _outputs; ++o ) {
+      output = ( o + output_offset ) % _outputs;
+
+      if ( ( _request[input][output].label != -1 ) && 
+	   ( _counts[output] < lonely_cnt ) ) {
+	lonely = output;
+	lonely_cnt = _counts[output];
+      }
+    }
+
+    // Request the lonely output (-1 for no request)
+    _req[input] = lonely;
+  }
+
+  // Grant phase
+  for ( output = 0; output < _outputs; ++output ) {
+    input_offset = _gptr[output];
+
+    for ( int i = 0; i < _inputs; ++i ) {
+      input = ( i + input_offset ) % _inputs;  
+      
+      if ( _req[input] == output ) {
+	// Grant!
+	
+	_inmatch[input]   = output;
+	_outmatch[output] = input;
+	
+	_rptr[input] = ( _rptr[input] + 1 ) % _outputs;
+	_gptr[output] = ( _gptr[output] + 1 ) % _inputs;
+	
+	break;
+      }
+    }
+  }
+
+
+}
+
+
-- 
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