From a9237f50ea01efdd62f86d334a38ffbe80a3d141 Mon Sep 17 00:00:00 2001
From: Alan Mishchenko <alanmi@berkeley.edu>
Date: Sun, 31 Jul 2022 19:12:55 -0700
Subject: New switch in command &st for adding buffers.

---
 src/aig/gia/giaDup.c | 21 +++++++++++++++++++++
 src/base/abci/abc.c  | 22 +++++++++++++++++-----
 2 files changed, 38 insertions(+), 5 deletions(-)

diff --git a/src/aig/gia/giaDup.c b/src/aig/gia/giaDup.c
index cc501562..c9af8a32 100644
--- a/src/aig/gia/giaDup.c
+++ b/src/aig/gia/giaDup.c
@@ -860,6 +860,27 @@ Gia_Man_t * Gia_ManDupMap( Gia_Man_t * p, Vec_Int_t * vMap )
     Gia_ManSetRegNum( pNew, Gia_ManRegNum(p) );
     return pNew;
 }
+Gia_Man_t * Gia_ManDupAddBufs( Gia_Man_t * p )
+{
+    Gia_Man_t * pNew;
+    Gia_Obj_t * pObj;
+    int i;
+    pNew = Gia_ManStart( Gia_ManObjNum(p) + Gia_ManCiNum(p) + Gia_ManCoNum(p) );
+    Gia_ManHashStart( pNew );
+    Gia_ManConst0(p)->Value = 0;
+    Gia_ManForEachCi( p, pObj, i )
+        pObj->Value = Gia_ManAppendCi( pNew );
+    Gia_ManForEachCi( p, pObj, i )
+        pObj->Value = Gia_ManAppendBuf( pNew, pObj->Value );
+    Gia_ManForEachAnd( p, pObj, i )
+        pObj->Value = Gia_ManHashAnd( pNew, Gia_ObjFanin0Copy(pObj), Gia_ObjFanin1Copy(pObj) );
+    Gia_ManForEachCo( p, pObj, i )
+        pObj->Value = Gia_ManAppendBuf( pNew, Gia_ObjFanin0Copy(pObj) );
+    Gia_ManForEachCo( p, pObj, i )
+        pObj->Value = Gia_ManAppendCo( pNew, pObj->Value );
+    Gia_ManHashStop( pNew );
+    return pNew;
+}
 
 /**Function*************************************************************
 
diff --git a/src/base/abci/abc.c b/src/base/abci/abc.c
index 2ae994e3..cc5de8cd 100644
--- a/src/base/abci/abc.c
+++ b/src/base/abci/abc.c
@@ -32396,13 +32396,14 @@ int Abc_CommandAbc9Strash( Abc_Frame_t * pAbc, int argc, char ** argv )
     Gia_Man_t * pTemp;
     int c, Limit = 2;
     int Multi = 0;
+    int fAddBuffs  = 0;
     int fAddStrash = 0;
-    int fCollapse = 0;
-    int fAddMuxes = 0;
-    int fStrMuxes = 0;
+    int fCollapse  = 0;
+    int fAddMuxes  = 0;
+    int fStrMuxes  = 0;
     int fRehashMap = 0;
     Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "LMacmrsh" ) ) != EOF )
+    while ( ( c = Extra_UtilGetopt( argc, argv, "LMbacmrsh" ) ) != EOF )
     {
         switch ( c )
         {
@@ -32428,6 +32429,9 @@ int Abc_CommandAbc9Strash( Abc_Frame_t * pAbc, int argc, char ** argv )
             if ( Multi <= 0 )
                 goto usage;
             break;
+        case 'b':
+            fAddBuffs ^= 1;
+            break;
         case 'a':
             fAddStrash ^= 1;
             break;
@@ -32454,6 +32458,13 @@ int Abc_CommandAbc9Strash( Abc_Frame_t * pAbc, int argc, char ** argv )
         Abc_Print( -1, "Abc_CommandAbc9Strash(): There is no AIG.\n" );
         return 1;
     }
+    if ( fAddBuffs )
+    {
+        extern Gia_Man_t * Gia_ManDupAddBufs( Gia_Man_t * p );
+        pTemp = Gia_ManDupAddBufs( pAbc->pGia );
+        Abc_FrameUpdateGia( pAbc, pTemp );
+        return 0;
+    }
     if ( Multi > 0 )
     {
         extern Gia_Man_t * Gia_ManDupAddPis( Gia_Man_t * p, int nMulti );
@@ -32528,8 +32539,9 @@ int Abc_CommandAbc9Strash( Abc_Frame_t * pAbc, int argc, char ** argv )
     return 0;
 
 usage:
-    Abc_Print( -2, "usage: &st [-LM num] [-acmrsh]\n" );
+    Abc_Print( -2, "usage: &st [-LM num] [-bacmrsh]\n" );
     Abc_Print( -2, "\t         performs structural hashing\n" );
+    Abc_Print( -2, "\t-b     : toggle adding buffers at the inputs and outputs [default = %s]\n", fAddBuffs? "yes": "no" );
     Abc_Print( -2, "\t-a     : toggle additional hashing [default = %s]\n", fAddStrash? "yes": "no" );
     Abc_Print( -2, "\t-c     : toggle collapsing hierarchical AIG [default = %s]\n", fCollapse? "yes": "no" );
     Abc_Print( -2, "\t-m     : toggle converting to larger gates [default = %s]\n", fAddMuxes? "yes": "no" );
-- 
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