From da5a7a235fe32a33b2d7b3beaec8cd7aa3c88c97 Mon Sep 17 00:00:00 2001
From: Alan Mishchenko <alanmi@berkeley.edu>
Date: Thu, 12 Mar 2020 00:33:45 +0200
Subject: Adding limit on the number of live BDD nodes in command 'muxes -g'.

---
 src/base/abci/abc.c      | 29 ++++++++++++++++++++---------
 src/base/abci/abcNtbdd.c | 18 +++++++++++-------
 2 files changed, 31 insertions(+), 16 deletions(-)

(limited to 'src/base/abci')

diff --git a/src/base/abci/abc.c b/src/base/abci/abc.c
index deda44e3..3f9aae45 100644
--- a/src/base/abci/abc.c
+++ b/src/base/abci/abc.c
@@ -10985,15 +10985,25 @@ usage:
 int Abc_CommandMuxes( Abc_Frame_t * pAbc, int argc, char ** argv )
 {
     Abc_Ntk_t * pNtk, * pNtkRes;
-    int c, fGlobal = 0;
-
+    int c, fGlobal = 0, Limit = 1000000;
     pNtk = Abc_FrameReadNtk(pAbc);
     // set defaults
     Extra_UtilGetoptReset();
-    while ( ( c = Extra_UtilGetopt( argc, argv, "gh" ) ) != EOF )
+    while ( ( c = Extra_UtilGetopt( argc, argv, "Bgh" ) ) != EOF )
     {
         switch ( c )
         {
+        case 'B':
+            if ( globalUtilOptind >= argc )
+            {
+                Abc_Print( -1, "Command line switch \"-B\" should be followed by an integer.\n" );
+                goto usage;
+            }
+            Limit = atoi(argv[globalUtilOptind]);
+            globalUtilOptind++;
+            if ( Limit < 0 )
+                goto usage;
+            break;
         case 'g':
             fGlobal ^= 1;
             break;
@@ -11028,7 +11038,7 @@ int Abc_CommandMuxes( Abc_Frame_t * pAbc, int argc, char ** argv )
     }
 
     // get the new network
-    pNtkRes = Abc_NtkBddToMuxes( pNtk, fGlobal );
+    pNtkRes = Abc_NtkBddToMuxes( pNtk, fGlobal, Limit );
     if ( pNtkRes == NULL )
     {
         Abc_Print( -1, "Converting to MUXes has failed.\n" );
@@ -11039,11 +11049,12 @@ int Abc_CommandMuxes( Abc_Frame_t * pAbc, int argc, char ** argv )
     return 0;
 
 usage:
-    Abc_Print( -2, "usage: muxes [-gh]\n" );
-    Abc_Print( -2, "\t        converts the current network into a network derived by\n" );
-    Abc_Print( -2, "\t        replacing all nodes by DAGs isomorphic to the local BDDs\n" );
-    Abc_Print( -2, "\t-g    : toggle visualizing the global BDDs of primary outputs [default = %s].\n", fGlobal? "yes": "no" );
-    Abc_Print( -2, "\t-h    : print the command usage\n");
+    Abc_Print( -2, "usage: muxes [-B num] [-gh]\n" );
+    Abc_Print( -2, "\t          converts the current network into a network derived by\n" );
+    Abc_Print( -2, "\t          replacing all nodes by DAGs isomorphic to the local BDDs\n" );
+    Abc_Print( -2, "\t-B <num>: limit on live BDD nodes during collapsing [default = %d]\n", Limit );
+    Abc_Print( -2, "\t-g      : toggle visualizing the global BDDs of primary outputs [default = %s].\n", fGlobal? "yes": "no" );
+    Abc_Print( -2, "\t-h      : print the command usage\n");
     return 1;
 }
 
diff --git a/src/base/abci/abcNtbdd.c b/src/base/abci/abcNtbdd.c
index 5dc662d7..fc926857 100644
--- a/src/base/abci/abcNtbdd.c
+++ b/src/base/abci/abcNtbdd.c
@@ -34,7 +34,7 @@ ABC_NAMESPACE_IMPL_START
 
 #ifdef ABC_USE_CUDD
 
-static void        Abc_NtkBddToMuxesPerformGlo( Abc_Ntk_t * pNtk, Abc_Ntk_t * pNtkNew );
+static int         Abc_NtkBddToMuxesPerformGlo( Abc_Ntk_t * pNtk, Abc_Ntk_t * pNtkNew, int Limit );
 static void        Abc_NtkBddToMuxesPerform( Abc_Ntk_t * pNtk, Abc_Ntk_t * pNtkNew );
 static Abc_Obj_t * Abc_NodeBddToMuxes( Abc_Obj_t * pNodeOld, Abc_Ntk_t * pNtkNew );
 static Abc_Obj_t * Abc_NodeBddToMuxes_rec( DdManager * dd, DdNode * bFunc, Abc_Ntk_t * pNtkNew, st__table * tBdd2Node );
@@ -129,12 +129,15 @@ Abc_Ntk_t * Abc_NtkDeriveFromBdd( void * dd0, void * bFunc, char * pNamePo, Vec_
   SeeAlso     []
 
 ***********************************************************************/
-Abc_Ntk_t * Abc_NtkBddToMuxes( Abc_Ntk_t * pNtk, int fGlobal )
+Abc_Ntk_t * Abc_NtkBddToMuxes( Abc_Ntk_t * pNtk, int fGlobal, int Limit )
 {
     Abc_Ntk_t * pNtkNew;
     pNtkNew = Abc_NtkStartFrom( pNtk, ABC_NTK_LOGIC, ABC_FUNC_SOP );
     if ( fGlobal ) 
-        Abc_NtkBddToMuxesPerformGlo( pNtk, pNtkNew );
+    {
+        if ( !Abc_NtkBddToMuxesPerformGlo( pNtk, pNtkNew, Limit ) )
+            return NULL;
+    }
     else
     {
         Abc_NtkBddToMuxesPerform( pNtk, pNtkNew );
@@ -259,17 +262,17 @@ Abc_Obj_t * Abc_NodeBddToMuxes_rec( DdManager * dd, DdNode * bFunc, Abc_Ntk_t *
   SeeAlso     []
 
 ***********************************************************************/
-void Abc_NtkBddToMuxesPerformGlo( Abc_Ntk_t * pNtk, Abc_Ntk_t * pNtkNew )
+int Abc_NtkBddToMuxesPerformGlo( Abc_Ntk_t * pNtk, Abc_Ntk_t * pNtkNew, int Limit )
 {
     DdManager * dd;
     Abc_Obj_t * pObj, * pObjNew; int i;
     st__table * tBdd2Node;
     assert( Abc_NtkIsStrash(pNtk) );
-    dd = (DdManager *)Abc_NtkBuildGlobalBdds( pNtk, 10000000, 1, 1, 0, 0 );
+    dd = (DdManager *)Abc_NtkBuildGlobalBdds( pNtk, Limit, 1, 1, 0, 0 );
     if ( dd == NULL )
     {
         printf( "Construction of global BDDs has failed.\n" );
-        return;
+        return 0;
     }
     //printf( "Shared BDD size = %6d nodes.\n", Cudd_ReadKeys(dd) - Cudd_ReadDead(dd) );
 
@@ -292,6 +295,7 @@ void Abc_NtkBddToMuxesPerformGlo( Abc_Ntk_t * pNtk, Abc_Ntk_t * pNtkNew )
     Abc_NtkFreeGlobalBdds( pNtk, 0 );
     Extra_StopManager( dd );
     Abc_NtkCleanCopy( pNtk );
+    return 1;
 }
 
 /**Function*************************************************************
@@ -655,7 +659,7 @@ ABC_PRT( "Time", Abc_Clock() - clk );
 #else
 
 double Abc_NtkSpacePercentage( Abc_Obj_t * pNode ) { return 0.0; }
-Abc_Ntk_t * Abc_NtkBddToMuxes( Abc_Ntk_t * pNtk, int fGlobal ) { return NULL; }
+Abc_Ntk_t * Abc_NtkBddToMuxes( Abc_Ntk_t * pNtk, int fGlobal, int Limit ) { return NULL; }
 
 
 #endif
-- 
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