mirror of https://github.com/YosysHQ/abc.git
Added new sorting procedures.
This commit is contained in:
Alan Mishchenko
parent
4ffe37b34b
commit
5303465ed6
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/**CFile****************************************************************
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FileName [utilSort.c]
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SystemName [ABC: Logic synthesis and verification system.]
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PackageName [Merge sort with user-specified cost.]
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Synopsis [Merge sort with user-specified cost.]
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Author [Alan Mishchenko]
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Affiliation [UC Berkeley]
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Date [Ver. 1.0. Started - Feburary 13, 2011.]
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Revision [$Id: utilSort.c,v 1.00 2011/02/11 00:00:00 alanmi Exp $]
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***********************************************************************/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <assert.h>
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#include "abc_global.h"
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ABC_NAMESPACE_IMPL_START
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////////////////////////////////////////////////////////////////////////
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/// DECLARATIONS ///
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////////////////////////////////////////////////////////////////////////
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////////////////////////////////////////////////////////////////////////
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/// FUNCTION DEFINITIONS ///
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////////////////////////////////////////////////////////////////////////
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/**Function*************************************************************
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Synopsis [Merging two lists of entries.]
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Description []
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SideEffects []
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SeeAlso []
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***********************************************************************/
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void Abc_SortMerge( int * p1Beg, int * p1End, int * p2Beg, int * p2End, int * pOut )
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{
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int nEntries = (p1End - p1Beg) + (p2End - p2Beg);
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int * pOutBeg = pOut;
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while ( p1Beg < p1End && p2Beg < p2End )
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{
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if ( *p1Beg == *p2Beg )
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*pOut++ = *p1Beg++, *pOut++ = *p2Beg++;
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else if ( *p1Beg < *p2Beg )
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*pOut++ = *p1Beg++;
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else // if ( *p1Beg > *p2Beg )
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*pOut++ = *p2Beg++;
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}
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while ( p1Beg < p1End )
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*pOut++ = *p1Beg++;
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while ( p2Beg < p2End )
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*pOut++ = *p2Beg++;
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assert( pOut - pOutBeg == nEntries );
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}
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/**Function*************************************************************
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Synopsis [Recursive sorting.]
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Description []
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SideEffects []
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SeeAlso []
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***********************************************************************/
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void Abc_Sort_rec( int * pInBeg, int * pInEnd, int * pOutBeg )
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{
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int nSize = pInEnd - pInBeg;
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assert( nSize > 0 );
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if ( nSize == 1 )
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return;
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if ( nSize == 2 )
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{
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if ( pInBeg[0] > pInBeg[1] )
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{
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pInBeg[0] ^= pInBeg[1];
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pInBeg[1] ^= pInBeg[0];
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pInBeg[0] ^= pInBeg[1];
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}
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}
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else if ( nSize < 8 )
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{
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int temp, i, j, best_i;
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for ( i = 0; i < nSize-1; i++ )
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{
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best_i = i;
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for ( j = i+1; j < nSize; j++ )
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if ( pInBeg[j] < pInBeg[best_i] )
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best_i = j;
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temp = pInBeg[i];
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pInBeg[i] = pInBeg[best_i];
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pInBeg[best_i] = temp;
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}
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}
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else
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{
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Abc_Sort_rec( pInBeg, pInBeg + nSize/2, pOutBeg );
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Abc_Sort_rec( pInBeg + nSize/2, pInEnd, pOutBeg + nSize/2 );
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Abc_SortMerge( pInBeg, pInBeg + nSize/2, pInBeg + nSize/2, pInEnd, pOutBeg );
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memcpy( pInBeg, pOutBeg, sizeof(int) * nSize );
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}
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}
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/**Function*************************************************************
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Synopsis [Returns the sorted array of integers.]
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Description [This procedure is about 10% faster than qsort().]
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SideEffects []
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SeeAlso []
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***********************************************************************/
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void Abc_Sort( int * pInput, int nSize )
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{
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int * pOutput;
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if ( nSize < 2 )
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return;
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pOutput = (int *) malloc( sizeof(int) * nSize );
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Abc_Sort_rec( pInput, pInput + nSize, pOutput );
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free( pOutput );
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}
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/**Function*************************************************************
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Synopsis [Merging two lists of entries.]
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Description []
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SideEffects []
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SeeAlso []
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***********************************************************************/
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void Abc_SortCostMerge( int * p1Beg, int * p1End, int * p2Beg, int * p2End, int * pOut )
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{
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int nEntries = (p1End - p1Beg) + (p2End - p2Beg);
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int * pOutBeg = pOut;
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while ( p1Beg < p1End && p2Beg < p2End )
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{
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if ( p1Beg[1] == p2Beg[1] )
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*pOut++ = *p1Beg++, *pOut++ = *p1Beg++, *pOut++ = *p2Beg++, *pOut++ = *p2Beg++;
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else if ( p1Beg[1] < p2Beg[1] )
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*pOut++ = *p1Beg++, *pOut++ = *p1Beg++;
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else // if ( p1Beg[1] > p2Beg[1] )
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*pOut++ = *p2Beg++, *pOut++ = *p2Beg++;
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}
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while ( p1Beg < p1End )
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*pOut++ = *p1Beg++, *pOut++ = *p1Beg++;
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while ( p2Beg < p2End )
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*pOut++ = *p2Beg++, *pOut++ = *p2Beg++;
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assert( pOut - pOutBeg == nEntries );
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}
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/**Function*************************************************************
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Synopsis [Recursive sorting.]
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Description []
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SideEffects []
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SeeAlso []
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***********************************************************************/
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void Abc_SortCost_rec( int * pInBeg, int * pInEnd, int * pOutBeg )
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{
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int nSize = (pInEnd - pInBeg)/2;
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assert( nSize > 0 );
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if ( nSize == 1 )
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return;
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if ( nSize == 2 )
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{
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if ( pInBeg[1] > pInBeg[3] )
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{
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pInBeg[1] ^= pInBeg[3];
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pInBeg[3] ^= pInBeg[1];
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pInBeg[1] ^= pInBeg[3];
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pInBeg[0] ^= pInBeg[2];
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pInBeg[2] ^= pInBeg[0];
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pInBeg[0] ^= pInBeg[2];
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}
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}
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else if ( nSize < 8 )
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{
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int temp, i, j, best_i;
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for ( i = 0; i < nSize-1; i++ )
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{
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best_i = i;
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for ( j = i+1; j < nSize; j++ )
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if ( pInBeg[2*j+1] < pInBeg[2*best_i+1] )
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best_i = j;
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temp = pInBeg[2*i];
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pInBeg[2*i] = pInBeg[2*best_i];
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pInBeg[2*best_i] = temp;
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temp = pInBeg[2*i+1];
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pInBeg[2*i+1] = pInBeg[2*best_i+1];
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pInBeg[2*best_i+1] = temp;
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}
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}
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else
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{
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Abc_SortCost_rec( pInBeg, pInBeg + 2*(nSize/2), pOutBeg );
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Abc_SortCost_rec( pInBeg + 2*(nSize/2), pInEnd, pOutBeg + 2*(nSize/2) );
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Abc_SortCostMerge( pInBeg, pInBeg + 2*(nSize/2), pInBeg + 2*(nSize/2), pInEnd, pOutBeg );
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memcpy( pInBeg, pOutBeg, sizeof(int) * 2 * nSize );
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}
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}
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/**Function*************************************************************
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Synopsis [Sorting procedure.]
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Description [Returns permutation for the non-decreasing order of costs.]
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SideEffects []
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SeeAlso []
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***********************************************************************/
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int * Abc_SortCost( int * pCosts, int nSize )
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{
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int i, * pResult, * pInput, * pOutput;
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pResult = (int *) calloc( sizeof(int), nSize );
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if ( nSize < 2 )
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return pResult;
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pInput = (int *) malloc( sizeof(int) * 2 * nSize );
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pOutput = (int *) malloc( sizeof(int) * 2 * nSize );
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for ( i = 0; i < nSize; i++ )
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pInput[2*i] = i, pInput[2*i+1] = pCosts[i];
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Abc_SortCost_rec( pInput, pInput + 2*nSize, pOutput );
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for ( i = 0; i < nSize; i++ )
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pResult[i] = pInput[2*i];
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free( pOutput );
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free( pInput );
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return pResult;
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}
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// this implementation uses 3x less memory but is 30% slower due to cache misses
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#if 0
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/**Function*************************************************************
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Synopsis [Merging two lists of entries.]
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Description []
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SideEffects []
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SeeAlso []
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***********************************************************************/
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void Abc_SortCostMerge( int * p1Beg, int * p1End, int * p2Beg, int * p2End, int * pOut, int * pCost )
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{
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int nEntries = (p1End - p1Beg) + (p2End - p2Beg);
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int * pOutBeg = pOut;
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while ( p1Beg < p1End && p2Beg < p2End )
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{
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if ( pCost[*p1Beg] == pCost[*p2Beg] )
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*pOut++ = *p1Beg++, *pOut++ = *p2Beg++;
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else if ( pCost[*p1Beg] < pCost[*p2Beg] )
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*pOut++ = *p1Beg++;
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else // if ( pCost[*p1Beg] > pCost[*p2Beg] )
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*pOut++ = *p2Beg++;
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}
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while ( p1Beg < p1End )
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*pOut++ = *p1Beg++;
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while ( p2Beg < p2End )
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*pOut++ = *p2Beg++;
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assert( pOut - pOutBeg == nEntries );
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}
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/**Function*************************************************************
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Synopsis [Recursive sorting.]
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Description []
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SideEffects []
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SeeAlso []
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***********************************************************************/
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void Abc_SortCost_rec( int * pInBeg, int * pInEnd, int * pOutBeg, int * pCost )
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{
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int nSize = pInEnd - pInBeg;
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assert( nSize > 0 );
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if ( nSize == 1 )
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return;
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if ( nSize == 2 )
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{
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if ( pCost[pInBeg[0]] > pCost[pInBeg[1]] )
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{
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pInBeg[0] ^= pInBeg[1];
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pInBeg[1] ^= pInBeg[0];
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pInBeg[0] ^= pInBeg[1];
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}
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}
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else if ( nSize < 8 )
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{
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int temp, i, j, best_i;
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for ( i = 0; i < nSize-1; i++ )
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{
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best_i = i;
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for ( j = i+1; j < nSize; j++ )
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if ( pCost[pInBeg[j]] < pCost[pInBeg[best_i]] )
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best_i = j;
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temp = pInBeg[i];
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pInBeg[i] = pInBeg[best_i];
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pInBeg[best_i] = temp;
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}
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}
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else
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{
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Abc_SortCost_rec( pInBeg, pInBeg + nSize/2, pOutBeg, pCost );
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Abc_SortCost_rec( pInBeg + nSize/2, pInEnd, pOutBeg + nSize/2, pCost );
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Abc_SortCostMerge( pInBeg, pInBeg + nSize/2, pInBeg + nSize/2, pInEnd, pOutBeg, pCost );
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memcpy( pInBeg, pOutBeg, sizeof(int) * nSize );
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}
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}
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/**Function*************************************************************
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Synopsis [Sorting procedure.]
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Description [Returns permutation for the non-decreasing order of costs.]
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SideEffects []
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SeeAlso []
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***********************************************************************/
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int * Abc_SortCost( int * pCosts, int nSize )
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{
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int i, * pInput, * pOutput;
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pInput = (int *) malloc( sizeof(int) * nSize );
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for ( i = 0; i < nSize; i++ )
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pInput[i] = i;
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if ( nSize < 2 )
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return pInput;
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pOutput = (int *) malloc( sizeof(int) * nSize );
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Abc_SortCost_rec( pInput, pInput + nSize, pOutput, pCosts );
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free( pOutput );
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return pInput;
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}
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#endif
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/**Function*************************************************************
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Synopsis []
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Description []
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SideEffects []
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SeeAlso []
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***********************************************************************/
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int Abc_SortNumCompare( int * pNum1, int * pNum2 )
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{
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return *pNum1 - *pNum2;
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}
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/**Function*************************************************************
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Synopsis [Testing the sorting procedure.]
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Description []
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SideEffects []
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SeeAlso []
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***********************************************************************/
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void Abc_SortTest()
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{
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int fUseNew = 0;
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int i, clk, nSize = 50000000;
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int * pArray = (int *)malloc( sizeof(int) * nSize );
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int * pPerm;
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// generate numbers
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srand( 1000 );
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for ( i = 0; i < nSize; i++ )
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pArray[i] = rand();
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// try sorting
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if ( fUseNew )
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{
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int fUseCost = 1;
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if ( fUseCost )
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{
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clk = clock();
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pPerm = Abc_SortCost( pArray, nSize );
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Abc_PrintTime( 1, "New sort", clock() - clk );
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// check
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for ( i = 1; i < nSize; i++ )
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assert( pArray[pPerm[i-1]] <= pArray[pPerm[i]] );
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free( pPerm );
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}
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else
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{
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clk = clock();
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Abc_Sort( pArray, nSize );
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Abc_PrintTime( 1, "New sort", clock() - clk );
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// check
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for ( i = 1; i < nSize; i++ )
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assert( pArray[i-1] <= pArray[i] );
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}
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}
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else
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{
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clk = clock();
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qsort( (void *)pArray, nSize, sizeof(int), (int (*)(const void *, const void *)) Abc_SortNumCompare );
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Abc_PrintTime( 1, "Old sort", clock() - clk );
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// check
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for ( i = 1; i < nSize; i++ )
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assert( pArray[i-1] <= pArray[i] );
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}
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free( pArray );
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}
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////////////////////////////////////////////////////////////////////////
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/// END OF FILE ///
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////////////////////////////////////////////////////////////////////////
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ABC_NAMESPACE_IMPL_END
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