From feb3e7943de06c7c5ba16c53a23df00aa3c46cd0 Mon Sep 17 00:00:00 2001
From: Alan Mishchenko <alanmi@berkeley.edu>
Date: Sat, 26 Oct 2019 16:29:05 +0300
Subject: Adding limit on the depth of recursion when counting exact area in
 'amap'.

---
 src/map/amap/amapInt.h   |  1 +
 src/map/amap/amapMan.c   |  2 ++
 src/map/amap/amapMatch.c | 60 +++++++++++++++++++++++++++++++++++++++++++++++-
 3 files changed, 62 insertions(+), 1 deletion(-)

(limited to 'src/map/amap')

diff --git a/src/map/amap/amapInt.h b/src/map/amap/amapInt.h
index 3a6432de..2dfcafb6 100644
--- a/src/map/amap/amapInt.h
+++ b/src/map/amap/amapInt.h
@@ -103,6 +103,7 @@ struct Amap_Man_t_
     Vec_Ptr_t *        vCuts0;
     Vec_Ptr_t *        vCuts1;
     Vec_Ptr_t *        vCuts2;
+    Vec_Ptr_t *        vTempP;
     // statistics
     int                nCutsUsed;
     int                nCutsTried;
diff --git a/src/map/amap/amapMan.c b/src/map/amap/amapMan.c
index 6304c078..02c6227e 100644
--- a/src/map/amap/amapMan.c
+++ b/src/map/amap/amapMan.c
@@ -57,6 +57,7 @@ Amap_Man_t * Amap_ManStart( int nNodes )
     p->vCuts0  = Vec_PtrAlloc( 100 );
     p->vCuts1  = Vec_PtrAlloc( 100 );
     p->vCuts2  = Vec_PtrAlloc( 100 );
+    p->vTempP  = Vec_PtrAlloc( 100 );
     // prepare the memory manager
     p->pMemObj = Aig_MmFixedStart( sizeof(Amap_Obj_t), nNodes );
     p->pMemCuts = Aig_MmFlexStart();
@@ -84,6 +85,7 @@ void Amap_ManStop( Amap_Man_t * p )
     Vec_PtrFree( p->vCuts0 );
     Vec_PtrFree( p->vCuts1 );
     Vec_PtrFree( p->vCuts2 );
+    Vec_PtrFree( p->vTempP );
     Vec_IntFree( p->vTemp );
     Aig_MmFixedStop( p->pMemObj, 0 );
     Aig_MmFlexStop( p->pMemCuts, 0 );
diff --git a/src/map/amap/amapMatch.c b/src/map/amap/amapMatch.c
index 2276cfc2..a8df3aeb 100644
--- a/src/map/amap/amapMatch.c
+++ b/src/map/amap/amapMatch.c
@@ -288,6 +288,63 @@ static inline float Amap_CutAreaDeref( Amap_Man_t * p, Amap_Mat_t * pM )
     return Area;
 }
 
+/**Function*************************************************************
+
+  Synopsis    [Counts area while referencing the match.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline float Amap_CutAreaRef2( Amap_Man_t * p, Amap_Mat_t * pM, Vec_Ptr_t * vTemp, int Limit )
+{
+    Amap_Obj_t * pFanin;
+    int i, fCompl;
+    float Area = Amap_LibGate( p->pLib, pM->pSet->iGate )->dArea;
+    if ( Limit == 0 ) return Area;
+    Amap_MatchForEachFaninCompl( p, pM, pFanin, fCompl, i )
+    {
+        Vec_PtrPush( vTemp, pFanin->nFouts + fCompl );
+        assert( Amap_ObjRefsTotal(pFanin) >= 0 );
+        if ( (int)pFanin->fPolar != fCompl && pFanin->nFouts[fCompl] == 0 )
+            Area += p->fAreaInv;
+        if ( pFanin->nFouts[fCompl]++ + pFanin->nFouts[!fCompl] == 0 && Amap_ObjIsNode(pFanin) )
+            Area += Amap_CutAreaRef2( p, &pFanin->Best, vTemp, Limit-1 );
+    }
+    return Area;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Derives area of the match for a non-referenced node.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+static inline float Amap_CutAreaDerefed2( Amap_Man_t * p, Amap_Obj_t * pNode, Amap_Mat_t * pM )
+{
+    int nRecurLevels = 8;
+    int fComplNew, i, * pInt;
+    float aResult;
+    Vec_PtrClear( p->vTempP );
+    aResult = Amap_CutAreaRef2( p, pM, p->vTempP, nRecurLevels );
+    //Amap_CutAreaDeref( p, pM );
+    Vec_PtrForEachEntry( int *, p->vTempP, pInt, i )
+        (*pInt)--;
+    // if node is needed in another polarity, add inverter
+    fComplNew = pM->pCut->fInv ^ pM->pSet->fInv;
+    if ( pNode->nFouts[fComplNew] == 0 && pNode->nFouts[!fComplNew] > 0 )
+        aResult += p->fAreaInv;
+    return aResult;
+}
+
 /**Function*************************************************************
 
   Synopsis    [Counts area while referencing the match.]
@@ -444,7 +501,8 @@ static inline void Amap_ManMatchGetExacts( Amap_Man_t * p, Amap_Obj_t * pNode, A
     }
     pM->AveFan /= pGate->nPins;
     pM->Delay += 1.0;
-    pM->Area = Amap_CutAreaDerefed( p, pNode, pM );
+    //pM->Area = Amap_CutAreaDerefed( p, pNode, pM );
+    pM->Area = Amap_CutAreaDerefed2( p, pNode, pM );
 }
 
 /**Function*************************************************************
-- 
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