From 2ce1ce8bed69623de58d9394e22a3a8812096561 Mon Sep 17 00:00:00 2001
From: Alan Mishchenko <alanmi@berkeley.edu>
Date: Sun, 26 Sep 2021 11:12:17 -0700
Subject: Various changes.

---
 src/misc/util/abc_global.h |   1 +
 src/misc/util/utilSort.c   | 103 +++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 104 insertions(+)

(limited to 'src/misc/util')

diff --git a/src/misc/util/abc_global.h b/src/misc/util/abc_global.h
index f6076399..5ba614c7 100644
--- a/src/misc/util/abc_global.h
+++ b/src/misc/util/abc_global.h
@@ -516,6 +516,7 @@ static inline void Abc_ReverseOrder( int * pA, int nA )
 extern void   Abc_MergeSort( int * pInput, int nSize );
 extern int *  Abc_MergeSortCost( int * pCosts, int nSize );
 extern void   Abc_MergeSortCost2( int * pInput, int nSize, int * pCost );
+extern void   Abc_MergeSortCost2Reverse( int * pInput, int nSize, int * pCost );
 extern void   Abc_QuickSort1( word * pData, int nSize, int fDecrease );
 extern void   Abc_QuickSort2( word * pData, int nSize, int fDecrease );
 extern void   Abc_QuickSort3( word * pData, int nSize, int fDecrease );
diff --git a/src/misc/util/utilSort.c b/src/misc/util/utilSort.c
index 679017ed..a748caf9 100644
--- a/src/misc/util/utilSort.c
+++ b/src/misc/util/utilSort.c
@@ -239,6 +239,109 @@ void Abc_MergeSortCost2( int * pInput, int nSize, int * pCost )
 }
 
 
+/**Function*************************************************************
+
+  Synopsis    [Merging two lists of entries.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Abc_SortMergeCost2Reverse( int * p1Beg, int * p1End, int * p2Beg, int * p2End, int * pOut, int * pCost )
+{
+    int nEntries = (p1End - p1Beg) + (p2End - p2Beg);
+    int * pOutBeg = pOut;
+    while ( p1Beg < p1End && p2Beg < p2End )
+    {
+        if ( pCost[*p1Beg] == pCost[*p2Beg] )
+            *pOut++ = *p1Beg++, *pOut++ = *p2Beg++; 
+        else if ( pCost[*p1Beg] > pCost[*p2Beg] )
+            *pOut++ = *p1Beg++; 
+        else // if ( pCost[*p1Beg] < pCost[*p2Beg] )
+            *pOut++ = *p2Beg++; 
+    }
+    while ( p1Beg < p1End )
+        *pOut++ = *p1Beg++; 
+    while ( p2Beg < p2End )
+        *pOut++ = *p2Beg++;
+    assert( pOut - pOutBeg == nEntries );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Recursive sorting.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Abc_SortCost2Reverse_rec( int * pInBeg, int * pInEnd, int * pOutBeg, int * pCost )
+{
+    int nSize = pInEnd - pInBeg;
+    assert( nSize > 0 );
+    if ( nSize == 1 )
+        return;
+    if ( nSize == 2 )
+    {
+         if ( pCost[pInBeg[0]] < pCost[pInBeg[1]] )
+         {
+             pInBeg[0] ^= pInBeg[1];
+             pInBeg[1] ^= pInBeg[0];
+             pInBeg[0] ^= pInBeg[1];
+         }
+    }
+    else if ( nSize < 8 )
+    {
+        int temp, i, j, best_i;
+        for ( i = 0; i < nSize-1; i++ )
+        {
+            best_i = i;
+            for ( j = i+1; j < nSize; j++ )
+                if ( pCost[pInBeg[j]] > pCost[pInBeg[best_i]] )
+                    best_i = j;
+            temp = pInBeg[i]; 
+            pInBeg[i] = pInBeg[best_i]; 
+            pInBeg[best_i] = temp;
+        }
+    }
+    else
+    {
+        Abc_SortCost2Reverse_rec( pInBeg, pInBeg + nSize/2, pOutBeg, pCost );
+        Abc_SortCost2Reverse_rec( pInBeg + nSize/2, pInEnd, pOutBeg + nSize/2, pCost );
+        Abc_SortMergeCost2Reverse( pInBeg, pInBeg + nSize/2, pInBeg + nSize/2, pInEnd, pOutBeg, pCost );
+        memcpy( pInBeg, pOutBeg, sizeof(int) * nSize );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Returns the sorted array of integers.]
+
+  Description [This procedure is about 10% faster than qsort().]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Abc_MergeSortCost2Reverse( int * pInput, int nSize, int * pCost )
+{
+    int * pOutput;
+    if ( nSize < 2 )
+        return;
+    pOutput = (int *) malloc( sizeof(int) * nSize );
+    Abc_SortCost2Reverse_rec( pInput, pInput + nSize, pOutput, pCost );
+    free( pOutput );
+}
+
+
+
 /**Function*************************************************************
 
   Synopsis    [Merging two lists of entries.]
-- 
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