From 92ad58ffa2cba0aea4566e5097caf633cee4f750 Mon Sep 17 00:00:00 2001
From: Alan Mishchenko <alanmi@berkeley.edu>
Date: Fri, 13 Apr 2012 18:20:44 -0700
Subject: Adding iterative refinement to 'addbuffs'.

---
 src/base/abc/abcUtil.c | 27 ++++++++++++++++++++++++---
 src/base/abci/abc.c    | 20 +++++++++++++-------
 2 files changed, 37 insertions(+), 10 deletions(-)

diff --git a/src/base/abc/abcUtil.c b/src/base/abc/abcUtil.c
index 368bcaa0..540fd78c 100644
--- a/src/base/abc/abcUtil.c
+++ b/src/base/abc/abcUtil.c
@@ -2072,7 +2072,7 @@ Abc_Obj_t * Abc_NtkAddBuffsOne( Vec_Ptr_t * vBuffs, Abc_Obj_t * pFanin, int Leve
     }
     return pBuffer;
 }
-Abc_Ntk_t * Abc_NtkAddBuffs( Abc_Ntk_t * pNtkInit, int fReverse, int nImprove, int fVerbose )
+Abc_Ntk_t * Abc_NtkAddBuffsInt( Abc_Ntk_t * pNtkInit, int fReverse, int nImprove, int fVerbose )
 {
     Vec_Ptr_t * vBuffs;
     Abc_Ntk_t * pNtk = Abc_NtkDup( pNtkInit );
@@ -2120,7 +2120,7 @@ Abc_Ntk_t * Abc_NtkAddBuffs( Abc_Ntk_t * pNtkInit, int fReverse, int nImprove, i
                 }
             }
             if ( fVerbose )
-                printf( "Shifted %d nodes down with total gain %d.\n", Counter, TotalGain );
+                printf( "Shifted %5d nodes down with total gain %5d.\n", Counter, TotalGain );
             if ( Counter == 0 )
                 break;
         }
@@ -2155,7 +2155,7 @@ Abc_Ntk_t * Abc_NtkAddBuffs( Abc_Ntk_t * pNtkInit, int fReverse, int nImprove, i
                 }
             } 
             if ( fVerbose )
-                printf( "Shifted %d nodes up with total gain %d.\n", Counter, TotalGain );
+                printf( "Shifted %5d nodes up with total gain %5d.\n", Counter, TotalGain );
             if ( Counter == 0 )
                 break;
         }
@@ -2182,6 +2182,27 @@ Abc_Ntk_t * Abc_NtkAddBuffs( Abc_Ntk_t * pNtkInit, int fReverse, int nImprove, i
         pObj->Level = 0;
     return pNtk;
 }
+Abc_Ntk_t * Abc_NtkAddBuffs( Abc_Ntk_t * pNtkInit, int fDirect, int fReverse, int nImprove, int fVerbose )
+{
+    Abc_Ntk_t * pNtkD, * pNtkR;
+    if ( fDirect )
+        return Abc_NtkAddBuffsInt( pNtkInit, 0, nImprove, fVerbose );
+    if ( fReverse )
+        return Abc_NtkAddBuffsInt( pNtkInit, 1, nImprove, fVerbose );
+    pNtkD = Abc_NtkAddBuffsInt( pNtkInit, 0, nImprove, fVerbose );
+    pNtkR = Abc_NtkAddBuffsInt( pNtkInit, 1, nImprove, fVerbose );
+    if ( Abc_NtkNodeNum(pNtkD) < Abc_NtkNodeNum(pNtkR) )
+    {
+        Abc_NtkDelete( pNtkR );
+        return pNtkD;
+    }
+    else
+    {
+        Abc_NtkDelete( pNtkD );
+        return pNtkR;
+    }
+}
+
 
 /**Function*************************************************************
 
diff --git a/src/base/abci/abc.c b/src/base/abci/abc.c
index a2f1d184..7919794f 100644
--- a/src/base/abci/abc.c
+++ b/src/base/abci/abc.c
@@ -4550,18 +4550,20 @@ usage:
 ***********************************************************************/
 int Abc_CommandAddBuffs( Abc_Frame_t * pAbc, int argc, char ** argv )
 {
-    extern Abc_Ntk_t * Abc_NtkAddBuffs( Abc_Ntk_t * pNtk, int fReverse, int nImprove, int fVerbose );
+    extern Abc_Ntk_t * Abc_NtkAddBuffs( Abc_Ntk_t * pNtk, int fDirect, int fReverse, int nImprove, int fVerbose );
     Abc_Ntk_t * pNtk = Abc_FrameReadNtk(pAbc);
     Abc_Ntk_t * pNtkRes;
-    int c, fVerbose;
+    int fDirect;
     int fReverse;
     int nImprove;
+    int c, fVerbose;
 
-    nImprove = 1000;
+    fDirect  = 0;
     fReverse = 0;
+    nImprove = 1000;
     fVerbose = 0;
     Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "Irvh" ) ) != EOF )
+    while ( ( c = Extra_UtilGetopt( argc, argv, "Idrvh" ) ) != EOF )
     {
         switch ( c )
         {
@@ -4576,6 +4578,9 @@ int Abc_CommandAddBuffs( Abc_Frame_t * pAbc, int argc, char ** argv )
             if ( nImprove < 0 ) 
                 goto usage;
             break;
+        case 'd':
+            fDirect ^= 1;
+            break;
         case 'r':
             fReverse ^= 1;
             break;
@@ -4601,7 +4606,7 @@ int Abc_CommandAddBuffs( Abc_Frame_t * pAbc, int argc, char ** argv )
     }
 
     // modify the current network
-    pNtkRes = Abc_NtkAddBuffs( pNtk, fReverse, nImprove, fVerbose );
+    pNtkRes = Abc_NtkAddBuffs( pNtk, fDirect, fReverse, nImprove, fVerbose );
     if ( pNtkRes == NULL )
     {
         Abc_Print( -1, "The command has failed.\n" );
@@ -4612,10 +4617,11 @@ int Abc_CommandAddBuffs( Abc_Frame_t * pAbc, int argc, char ** argv )
     return 0;
 
 usage:
-    Abc_Print( -2, "usage: addbuffs [-I num] [-rvh]\n" );
+    Abc_Print( -2, "usage: addbuffs [-I num] [-drvh]\n" );
     Abc_Print( -2, "\t           adds buffers to create balanced CI/CO paths\n" );
     Abc_Print( -2, "\t-I <num> : the number of refinement iterations [default = %d]\n", nImprove );
-    Abc_Print( -2, "\t-r       : toggle reversing the levelized order [default = %s]\n", fReverse? "yes": "no" );
+    Abc_Print( -2, "\t-d       : toggle using only CI-to-CO levelized order [default = %s]\n", fDirect? "yes": "no" );
+    Abc_Print( -2, "\t-r       : toggle using only CO-to-C1 levelized order [default = %s]\n", fReverse? "yes": "no" );
     Abc_Print( -2, "\t-v       : toggle printing optimization summary [default = %s]\n", fVerbose? "yes": "no" );
     Abc_Print( -2, "\t-h       : print the command usage\n");
     return 1;
-- 
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