mirror of https://github.com/YosysHQ/abc.git
108 lines
3.6 KiB
C
108 lines
3.6 KiB
C
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/**CFile****************************************************************
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FileName [simSwitch.c]
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SystemName [ABC: Logic synthesis and verification system.]
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PackageName [Network and node package.]
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Synopsis [Computes switching activity of nodes in the ABC network.]
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Author [Alan Mishchenko]
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Affiliation [UC Berkeley]
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Date [Ver. 1.0. Started - June 20, 2005.]
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Revision [$Id: simSwitch.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $]
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***********************************************************************/
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#include "abc.h"
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#include "sim.h"
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////////////////////////////////////////////////////////////////////////
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/// DECLARATIONS ///
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////////////////////////////////////////////////////////////////////////
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static void Sim_NodeSimulate( Abc_Obj_t * pNode, Vec_Ptr_t * vSimInfo, int nSimWords );
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static float Sim_ComputeSwitching( unsigned * pSimInfo, int nSimWords );
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////////////////////////////////////////////////////////////////////////
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/// FUNCTION DEFITIONS ///
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////////////////////////////////////////////////////////////////////////
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/**Function*************************************************************
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Synopsis [Computes switching activity using simulation.]
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Description [Computes switching activity, which is understood as the
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probability of switching under random simulation. Assigns the
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random simulation information at the CI and propagates it through
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the internal nodes of the AIG.]
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SideEffects []
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SeeAlso []
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***********************************************************************/
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Vec_Int_t * Sim_NtkComputeSwitching( Abc_Ntk_t * pNtk, int nPatterns )
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{
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Vec_Int_t * vSwitching;
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float * pSwitching;
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Vec_Ptr_t * vNodes;
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Vec_Ptr_t * vSimInfo;
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Abc_Obj_t * pNode;
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unsigned * pSimInfo;
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int nSimWords, i;
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// allocate space for simulation info of all nodes
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nSimWords = SIM_NUM_WORDS(nPatterns);
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vSimInfo = Sim_UtilInfoAlloc( Abc_NtkObjNumMax(pNtk), nSimWords, 0 );
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// assign the random simulation to the CIs
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vSwitching = Vec_IntStart( Abc_NtkObjNumMax(pNtk) );
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pSwitching = (float *)vSwitching->pArray;
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Abc_NtkForEachCi( pNtk, pNode, i )
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{
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pSimInfo = Vec_PtrEntry(vSimInfo, pNode->Id);
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Sim_UtilGetRandom( pSimInfo, nSimWords );
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pSwitching[pNode->Id] = Sim_ComputeSwitching( pSimInfo, nSimWords );
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}
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// simulate the internal nodes
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vNodes = Abc_AigDfs( pNtk, 1, 0 );
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Vec_PtrForEachEntry( vNodes, pNode, i )
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{
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Sim_UtilSimulateNodeOne( pNode, vSimInfo, nSimWords );
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pSimInfo = Vec_PtrEntry(vSimInfo, pNode->Id);
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pSwitching[pNode->Id] = Sim_ComputeSwitching( pSimInfo, nSimWords );
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}
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Vec_PtrFree( vNodes );
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Sim_UtilInfoFree( vSimInfo );
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return vSwitching;
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}
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/**Function*************************************************************
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Synopsis [Computes switching activity of one node.]
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Description [Uses the formula: Switching = 2 * nOnes * nZeros / (nTotal ^ 2) ]
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SideEffects []
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SeeAlso []
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***********************************************************************/
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float Sim_ComputeSwitching( unsigned * pSimInfo, int nSimWords )
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{
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int nOnes, nTotal;
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nTotal = 32 * nSimWords;
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nOnes = Sim_UtilCountOnes( pSimInfo, nSimWords );
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return (float)2.0 * nOnes * (nTotal - nOnes) / nTotal / nTotal;
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}
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////////////////////////////////////////////////////////////////////////
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/// END OF FILE ///
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////////////////////////////////////////////////////////////////////////
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