From 3cf495c83197f838580a6efd25e9d5a68e871fa6 Mon Sep 17 00:00:00 2001
From: Bruno Schmitt <bruno@oschmitt.com>
Date: Wed, 11 May 2016 19:41:31 -0300
Subject: Add a new module which implements the fast extract with cube hashing
 (fxch) algorithm. Removes old partial implementation of this algorithm from
 the "pla" module.

---
 src/opt/fxch/Fxch.c | 140 ++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 src/opt/fxch/Fxch.c

(limited to 'src/opt/fxch/Fxch.c')

diff --git a/src/opt/fxch/Fxch.c b/src/opt/fxch/Fxch.c
new file mode 100644
index 00000000..9d674720
--- /dev/null
+++ b/src/opt/fxch/Fxch.c
@@ -0,0 +1,140 @@
+/**CFile****************************************************************
+
+  FileName    [ Fxch.c ]
+
+  PackageName [ Fast eXtract with Cube Hashing (FXCH) ]
+
+  Synopsis    [ The entrance into the fast extract module. ]
+
+  Author      [ Bruno Schmitt - boschmitt at inf.ufrgs.br ]
+
+  Affiliation [ UFRGS ]
+
+  Date        [ Ver. 1.0. Started - March 6, 2016. ]
+
+  Revision    []
+
+***********************************************************************/
+
+#include "Fxch.h"
+
+ABC_NAMESPACE_IMPL_START
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [ Performs fast extract with cube hashing on a set
+                of covers. ]
+
+  Description []
+
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Fxch_FastExtract( Vec_Wec_t* vCubes,
+                      int ObjIdMax,
+                      int nMaxDivExt,
+                      int SMode, 
+                      int fVerbose,
+                      int fVeryVerbose )
+{
+    abctime TempTime;
+    Fxch_Man_t* pFxchMan = Fxch_ManAlloc( vCubes, SMode );
+
+    TempTime = Abc_Clock();
+    Fxch_ManMapLiteralsIntoCubes( pFxchMan, ObjIdMax );
+    Fxch_ManGenerateLitHashKeys( pFxchMan );
+    Fxch_ManComputeLevel( pFxchMan );
+    Fxch_ManSCHashTablesInit( pFxchMan );
+    Fxch_ManDivCreate( pFxchMan );
+    pFxchMan->timeInit = Abc_Clock() - TempTime;
+
+    if ( fVeryVerbose )
+        Fxch_ManPrintDivs( pFxchMan );
+
+    if ( fVerbose )
+        Fxch_ManPrintStats( pFxchMan );
+
+    TempTime = Abc_Clock();
+    for ( int i = 0; i < nMaxDivExt && Vec_QueTopPriority( pFxchMan->vDivPrio ) > 0.0; i++ )
+    {
+        int iDiv = Vec_QuePop( pFxchMan->vDivPrio );
+
+        if ( fVeryVerbose )
+            Fxch_DivPrint( pFxchMan, iDiv );
+
+        Fxch_ManUpdate( pFxchMan, iDiv );
+    }
+    pFxchMan->timeExt = Abc_Clock() - TempTime;
+
+    if ( fVerbose )
+    {
+        Fxch_ManPrintStats( pFxchMan );
+        Abc_PrintTime( 1, "\n[FXCH] Elapsed Time", pFxchMan->timeInit + pFxchMan->timeExt );
+        Abc_PrintTime( 1, "[FXCH]    +-> Init", pFxchMan->timeInit );
+        Abc_PrintTime( 1, "[FXCH]    +-> Extr", pFxchMan->timeExt );
+    }
+
+    Fxch_ManSCHashTablesFree( pFxchMan );
+    Fxch_ManFree( pFxchMan );
+    Vec_WecRemoveEmpty( vCubes );
+
+    return 1;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [ Retrives the necessary information for the fast extract
+                with cube hashing. ]
+
+  Description []
+
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Abc_NtkFxchPerform( Abc_Ntk_t* pNtk,
+                        int nMaxDivExt,
+                        int SMode,
+                        int fVerbose,
+                        int fVeryVerbose )
+{
+    Vec_Wec_t* vCubes;
+
+    assert( Abc_NtkIsSopLogic( pNtk ) );
+
+    if ( !Abc_NtkFxCheck( pNtk ) )
+    {
+        printf( "Abc_NtkFxchPerform(): Nodes have duplicated fanins. FXCH is not performed.\n" );
+        return 0;
+    }
+
+    vCubes = Abc_NtkFxRetrieve( pNtk );
+    if ( Fxch_FastExtract( vCubes, Abc_NtkObjNumMax( pNtk ), nMaxDivExt, SMode, fVerbose, fVeryVerbose ) > 0 )
+    {
+        Abc_NtkFxInsert( pNtk, vCubes );
+        Vec_WecFree( vCubes );
+
+        if ( !Abc_NtkCheck( pNtk ) )
+            printf( "Abc_NtkFxchPerform(): The network check has failed.\n" );
+
+        return 1;
+    }
+    else
+        printf( "Warning: The network has not been changed by \"fxch\".\n" );
+
+    Vec_WecFree( vCubes );
+
+    return 0;
+}
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+ABC_NAMESPACE_IMPL_END
-- 
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