Added new sorting procedures.

src/misc/util/utilSort.c

+/**CFile****************************************************************
+
+  FileName    [utilSort.c]
+
+  SystemName  [ABC: Logic synthesis and verification system.]
+
+  PackageName [Merge sort with user-specified cost.]
+
+  Synopsis    [Merge sort with user-specified cost.]
+
+  Author      [Alan Mishchenko]
+  
+  Affiliation [UC Berkeley]
+
+  Date        [Ver. 1.0. Started - Feburary 13, 2011.]
+
+  Revision    [$Id: utilSort.c,v 1.00 2011/02/11 00:00:00 alanmi Exp $]
+
+***********************************************************************/
+
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+
+#include "abc_global.h"
+
+ABC_NAMESPACE_IMPL_START
+
+////////////////////////////////////////////////////////////////////////
+///                        DECLARATIONS                              ///
+////////////////////////////////////////////////////////////////////////
+
+////////////////////////////////////////////////////////////////////////
+///                     FUNCTION DEFINITIONS                         ///
+////////////////////////////////////////////////////////////////////////
+
+/**Function*************************************************************
+
+  Synopsis    [Merging two lists of entries.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Abc_SortMerge( int * p1Beg, int * p1End, int * p2Beg, int * p2End, int * pOut )
+{
+    int nEntries = (p1End - p1Beg) + (p2End - p2Beg);
+    int * pOutBeg = pOut;
+    while ( p1Beg < p1End && p2Beg < p2End )
+    {
+        if ( *p1Beg == *p2Beg )
+            *pOut++ = *p1Beg++, *pOut++ = *p2Beg++; 
+        else if ( *p1Beg < *p2Beg )
+            *pOut++ = *p1Beg++; 
+        else // if ( *p1Beg > *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_Sort_rec( int * pInBeg, int * pInEnd, int * pOutBeg )
+{
+    int nSize = pInEnd - pInBeg;
+    assert( nSize > 0 );
+    if ( nSize == 1 )
+        return;
+    if ( nSize == 2 )
+    {
+         if ( pInBeg[0] > 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 ( pInBeg[j] < pInBeg[best_i] )
+                    best_i = j;
+            temp = pInBeg[i]; 
+            pInBeg[i] = pInBeg[best_i]; 
+            pInBeg[best_i] = temp;
+        }
+    }
+    else
+    {
+        Abc_Sort_rec( pInBeg, pInBeg + nSize/2, pOutBeg );
+        Abc_Sort_rec( pInBeg + nSize/2, pInEnd, pOutBeg + nSize/2 );
+        Abc_SortMerge( pInBeg, pInBeg + nSize/2, pInBeg + nSize/2, pInEnd, pOutBeg );
+        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_Sort( int * pInput, int nSize )
+{
+    int * pOutput;
+    if ( nSize < 2 )
+        return;
+    pOutput = (int *) malloc( sizeof(int) * nSize );
+    Abc_Sort_rec( pInput, pInput + nSize, pOutput );
+    free( pOutput );
+}
+
+
+
+/**Function*************************************************************
+
+  Synopsis    [Merging two lists of entries.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Abc_SortCostMerge( int * p1Beg, int * p1End, int * p2Beg, int * p2End, int * pOut )
+{
+    int nEntries = (p1End - p1Beg) + (p2End - p2Beg);
+    int * pOutBeg = pOut;
+    while ( p1Beg < p1End && p2Beg < p2End )
+    {
+        if ( p1Beg[1] == p2Beg[1] )
+            *pOut++ = *p1Beg++, *pOut++ = *p1Beg++, *pOut++ = *p2Beg++, *pOut++ = *p2Beg++; 
+        else if ( p1Beg[1] < p2Beg[1] )
+            *pOut++ = *p1Beg++, *pOut++ = *p1Beg++; 
+        else // if ( p1Beg[1] > p2Beg[1] )
+            *pOut++ = *p2Beg++, *pOut++ = *p2Beg++; 
+    }
+    while ( p1Beg < p1End )
+        *pOut++ = *p1Beg++, *pOut++ = *p1Beg++; 
+    while ( p2Beg < p2End )
+        *pOut++ = *p2Beg++, *pOut++ = *p2Beg++;
+    assert( pOut - pOutBeg == nEntries );
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Recursive sorting.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Abc_SortCost_rec( int * pInBeg, int * pInEnd, int * pOutBeg )
+{
+    int nSize = (pInEnd - pInBeg)/2;
+    assert( nSize > 0 );
+    if ( nSize == 1 )
+        return;
+    if ( nSize == 2 )
+    {
+         if ( pInBeg[1] > pInBeg[3] )
+         {
+             pInBeg[1] ^= pInBeg[3];
+             pInBeg[3] ^= pInBeg[1];
+             pInBeg[1] ^= pInBeg[3];
+             pInBeg[0] ^= pInBeg[2];
+             pInBeg[2] ^= pInBeg[0];
+             pInBeg[0] ^= pInBeg[2];
+         }
+    }
+    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 ( pInBeg[2*j+1] < pInBeg[2*best_i+1] )
+                    best_i = j;
+            temp = pInBeg[2*i]; 
+            pInBeg[2*i] = pInBeg[2*best_i]; 
+            pInBeg[2*best_i] = temp;
+            temp = pInBeg[2*i+1]; 
+            pInBeg[2*i+1] = pInBeg[2*best_i+1]; 
+            pInBeg[2*best_i+1] = temp;
+        }
+    }
+    else
+    {
+        Abc_SortCost_rec( pInBeg, pInBeg + 2*(nSize/2), pOutBeg );
+        Abc_SortCost_rec( pInBeg + 2*(nSize/2), pInEnd, pOutBeg + 2*(nSize/2) );
+        Abc_SortCostMerge( pInBeg, pInBeg + 2*(nSize/2), pInBeg + 2*(nSize/2), pInEnd, pOutBeg );
+        memcpy( pInBeg, pOutBeg, sizeof(int) * 2 * nSize );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Sorting procedure.]
+
+  Description [Returns permutation for the non-decreasing order of costs.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int * Abc_SortCost( int * pCosts, int nSize )
+{
+    int i, * pResult, * pInput, * pOutput;
+    pResult = (int *) calloc( sizeof(int), nSize );
+    if ( nSize < 2 )
+        return pResult;
+    pInput  = (int *) malloc( sizeof(int) * 2 * nSize );
+    pOutput = (int *) malloc( sizeof(int) * 2 * nSize );
+    for ( i = 0; i < nSize; i++ )
+        pInput[2*i] = i, pInput[2*i+1] = pCosts[i];
+    Abc_SortCost_rec( pInput, pInput + 2*nSize, pOutput );
+    for ( i = 0; i < nSize; i++ )
+        pResult[i] = pInput[2*i];
+    free( pOutput );
+    free( pInput );
+    return pResult;
+}
+
+
+// this implementation uses 3x less memory but is 30% slower due to cache misses
+
+#if 0  
+
+/**Function*************************************************************
+
+  Synopsis    [Merging two lists of entries.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Abc_SortCostMerge( 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_SortCost_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_SortCost_rec( pInBeg, pInBeg + nSize/2, pOutBeg, pCost );
+        Abc_SortCost_rec( pInBeg + nSize/2, pInEnd, pOutBeg + nSize/2, pCost );
+        Abc_SortCostMerge( pInBeg, pInBeg + nSize/2, pInBeg + nSize/2, pInEnd, pOutBeg, pCost );
+        memcpy( pInBeg, pOutBeg, sizeof(int) * nSize );
+    }
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Sorting procedure.]
+
+  Description [Returns permutation for the non-decreasing order of costs.]
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int * Abc_SortCost( int * pCosts, int nSize )
+{
+    int i, * pInput, * pOutput;
+    pInput = (int *) malloc( sizeof(int) * nSize );
+    for ( i = 0; i < nSize; i++ )
+        pInput[i] = i;
+    if ( nSize < 2 )
+        return pInput;
+    pOutput = (int *) malloc( sizeof(int) * nSize );
+    Abc_SortCost_rec( pInput, pInput + nSize, pOutput, pCosts );
+    free( pOutput );
+    return pInput;
+}
+
+#endif
+
+
+
+
+/**Function*************************************************************
+
+  Synopsis    []
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+int Abc_SortNumCompare( int * pNum1, int * pNum2 )
+{
+    return *pNum1 - *pNum2;
+}
+
+/**Function*************************************************************
+
+  Synopsis    [Testing the sorting procedure.]
+
+  Description []
+               
+  SideEffects []
+
+  SeeAlso     []
+
+***********************************************************************/
+void Abc_SortTest()
+{
+    int fUseNew = 0;
+    int i, clk, nSize = 50000000;
+    int * pArray = (int *)malloc( sizeof(int) * nSize );
+    int * pPerm;
+    // generate numbers
+    srand( 1000 );
+    for ( i = 0; i < nSize; i++ )
+        pArray[i] = rand();
+
+    // try sorting
+    if ( fUseNew )
+    {
+        int fUseCost = 1;
+        if ( fUseCost )
+        {
+            clk = clock();
+            pPerm = Abc_SortCost( pArray, nSize );
+            Abc_PrintTime( 1, "New sort", clock() - clk );
+            // check
+            for ( i = 1; i < nSize; i++ )
+                assert( pArray[pPerm[i-1]] <= pArray[pPerm[i]] );
+            free( pPerm );
+        }
+        else
+        {
+            clk = clock();
+            Abc_Sort( pArray, nSize );
+            Abc_PrintTime( 1, "New sort", clock() - clk );
+            // check
+            for ( i = 1; i < nSize; i++ )
+                assert( pArray[i-1] <= pArray[i] );
+        }
+    }
+    else
+    {
+        clk = clock();
+        qsort( (void *)pArray, nSize, sizeof(int), (int (*)(const void *, const void *)) Abc_SortNumCompare );
+        Abc_PrintTime( 1, "Old sort", clock() - clk );
+        // check
+        for ( i = 1; i < nSize; i++ )
+            assert( pArray[i-1] <= pArray[i] );
+    }
+
+    free( pArray );
+}
+
+////////////////////////////////////////////////////////////////////////
+///                       END OF FILE                                ///
+////////////////////////////////////////////////////////////////////////
+
+
+ABC_NAMESPACE_IMPL_END
+