From 4812c90424dfc40d26725244723887a2d16ddfd9 Mon Sep 17 00:00:00 2001
From: Alan Mishchenko <alanmi@berkeley.edu>
Date: Mon, 1 Oct 2007 08:01:00 -0700
Subject: Version abc71001

---
 src/opt/ret/retCore.c | 132 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 132 insertions(+)
 create mode 100644 src/opt/ret/retCore.c

(limited to 'src/opt/ret/retCore.c')

diff --git a/src/opt/ret/retCore.c b/src/opt/ret/retCore.c
new file mode 100644
index 00000000..47b2cbbc
--- /dev/null
+++ b/src/opt/ret/retCore.c
@@ -0,0 +1,132 @@
+/**CFile****************************************************************
+
+  FileName    [retCore.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Retiming package.]
+
+  Synopsis    [The core retiming procedures.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - Oct 31, 2006.]
+
+  Revision    [$Id: retCore.c,v 1.00 2006/10/31 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include "retInt.h"
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+int timeRetime = 0;
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Implementation of retiming.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Abc_NtkRetime( Abc_Ntk_t * pNtk, int Mode, int fForwardOnly, int fBackwardOnly, int fOneStep, int fVerbose )
+{
+    int nLatches = Abc_NtkLatchNum(pNtk);
+    int nLevels  = Abc_NtkLevel(pNtk);
+    int RetValue = 0, clkTotal = clock();
+    int nNodesOld, nLatchesOld;
+    assert( Mode > 0 && Mode < 7 );
+    assert( !fForwardOnly || !fBackwardOnly );
+
+    // cleanup the network
+    nNodesOld   = Abc_NtkNodeNum(pNtk);
+    nLatchesOld = Abc_NtkLatchNum(pNtk);
+    Abc_NtkCleanupSeq(pNtk, 0, 0, 0);
+    if ( nNodesOld > Abc_NtkNodeNum(pNtk) || nLatchesOld > Abc_NtkLatchNum(pNtk) )
+        printf( "Cleanup before retiming removed %d dangling nodes and %d dangling latches.\n",
+            nNodesOld - Abc_NtkNodeNum(pNtk), nLatchesOld - Abc_NtkLatchNum(pNtk) );
+
+    // perform retiming
+    switch ( Mode )
+    {
+    case 1: // forward 
+        RetValue = Abc_NtkRetimeIncremental( pNtk, 1, 0, 0, fVerbose );
+        break;
+    case 2: // backward 
+        RetValue = Abc_NtkRetimeIncremental( pNtk, 0, 0, 0, fVerbose );
+        break;
+    case 3: // min-area 
+        RetValue = Abc_NtkRetimeMinArea( pNtk, fForwardOnly, fBackwardOnly, fVerbose );
+        break;
+    case 4: // min-delay
+        if ( !fBackwardOnly )
+            RetValue += Abc_NtkRetimeIncremental( pNtk, 1, 1, fOneStep, fVerbose );
+        if ( !fForwardOnly )
+            RetValue += Abc_NtkRetimeIncremental( pNtk, 0, 1, fOneStep, fVerbose );
+        break;
+    case 5: // min-area + min-delay
+        RetValue  = Abc_NtkRetimeMinArea( pNtk, fForwardOnly, fBackwardOnly, fVerbose );
+        if ( !fBackwardOnly )
+            RetValue += Abc_NtkRetimeIncremental( pNtk, 1, 1, 0, fVerbose );
+        if ( !fForwardOnly )
+            RetValue += Abc_NtkRetimeIncremental( pNtk, 0, 1, 0, fVerbose );
+        break;
+    case 6: // Pan's algorithm
+        RetValue = Abc_NtkRetimeLValue( pNtk, 500, fVerbose );
+        break;
+    default:
+        printf( "Unknown retiming option.\n" );
+        break;
+    }
+    if ( fVerbose )
+    {
+        printf( "Reduction in area = %3d. Reduction in delay = %3d. ", 
+            nLatches - Abc_NtkLatchNum(pNtk), nLevels - Abc_NtkLevel(pNtk) );
+        PRT( "Total runtime", clock() - clkTotal );
+    }
+    timeRetime = clock() - clkTotal;
+    return RetValue;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Used for automated debugging.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Abc_NtkRetimeDebug( Abc_Ntk_t * pNtk )
+{
+    extern int Abc_NtkSecFraig( Abc_Ntk_t * pNtk1, Abc_Ntk_t * pNtk2, int nSeconds, int nFrames, int fVerbose );
+    Abc_Ntk_t * pNtkRet;
+    assert( Abc_NtkIsLogic(pNtk) );
+    Abc_NtkToSop( pNtk, 0 );
+//    if ( !Abc_NtkCheck( pNtk ) )
+//        fprintf( stdout, "Abc_NtkRetimeDebug(): Network check has failed.\n" );
+//    Io_WriteBlifLogic( pNtk, "debug_temp.blif", 1 );
+    pNtkRet = Abc_NtkDup( pNtk );
+    Abc_NtkRetime( pNtkRet, 3, 0, 1, 0, 0 ); // debugging backward flow
+    return !Abc_NtkSecFraig( pNtk, pNtkRet, 10000, 3, 0 );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
-- 
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