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Diffstat (limited to 'src/base/abcs/abcForBack.c')
| -rw-r--r-- | src/base/abcs/abcForBack.c | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/src/base/abcs/abcForBack.c b/src/base/abcs/abcForBack.c deleted file mode 100644 index 4db162e1..00000000 --- a/src/base/abcs/abcForBack.c +++ /dev/null @@ -1,161 +0,0 @@ -/**CFile**************************************************************** - - FileName [abcForBack.c] - - SystemName [ABC: Logic synthesis and verification system.] - - PackageName [Network and node package.] - - Synopsis [Simple forward/backward retiming procedures.] - - Author [Alan Mishchenko] - - Affiliation [UC Berkeley] - - Date [Ver. 1.0. Started - June 20, 2005.] - - Revision [$Id: abcForBack.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $] - -***********************************************************************/ - -#include "abc.h" - -//////////////////////////////////////////////////////////////////////// -/// DECLARATIONS /// -//////////////////////////////////////////////////////////////////////// - -//////////////////////////////////////////////////////////////////////// -/// FUNCTION DEFITIONS /// -//////////////////////////////////////////////////////////////////////// - -/**Function************************************************************* - - Synopsis [Performs forward retiming of the sequential AIG.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Abc_NtkSeqRetimeForward( Abc_Ntk_t * pNtk ) -{ - Vec_Ptr_t * vNodes; - Abc_Obj_t * pNode, * pFanout; - int i, k, nLatches; - assert( Abc_NtkIsSeq( pNtk ) ); - // assume that all nodes can be retimed - vNodes = Vec_PtrAlloc( 100 ); - Abc_NtkForEachNode( pNtk, pNode, i ) - { - if ( Abc_NodeIsConst(pNode) ) - continue; - Vec_PtrPush( vNodes, pNode ); - pNode->fMarkA = 1; - } - // process the nodes - Vec_PtrForEachEntry( vNodes, pNode, i ) - { -// printf( "(%d,%d) ", Abc_ObjFaninL0(pNode), Abc_ObjFaninL0(pNode) ); - // get the number of latches to retime - nLatches = Abc_ObjFaninLMin(pNode); - if ( nLatches == 0 ) - continue; - assert( nLatches > 0 ); - // subtract these latches on the fanin side - Abc_ObjAddFaninL0( pNode, -nLatches ); - Abc_ObjAddFaninL1( pNode, -nLatches ); - // add these latches on the fanout size - Abc_ObjForEachFanout( pNode, pFanout, k ) - { - Abc_ObjAddFanoutL( pNode, pFanout, nLatches ); - if ( pFanout->fMarkA == 0 ) - { // schedule the node for updating - Vec_PtrPush( vNodes, pFanout ); - pFanout->fMarkA = 1; - } - } - // unmark the node as processed - pNode->fMarkA = 0; - } - Vec_PtrFree( vNodes ); - // clean the marks - Abc_NtkForEachNode( pNtk, pNode, i ) - { - pNode->fMarkA = 0; - if ( Abc_NodeIsConst(pNode) ) - continue; - assert( Abc_ObjFaninLMin(pNode) == 0 ); - } -} - -/**Function************************************************************* - - Synopsis [Performs forward retiming of the sequential AIG.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -void Abc_NtkSeqRetimeBackward( Abc_Ntk_t * pNtk ) -{ - Vec_Ptr_t * vNodes; - Abc_Obj_t * pNode, * pFanin, * pFanout; - int i, k, nLatches; - assert( Abc_NtkIsSeq( pNtk ) ); - // assume that all nodes can be retimed - vNodes = Vec_PtrAlloc( 100 ); - Abc_NtkForEachNode( pNtk, pNode, i ) - { - if ( Abc_NodeIsConst(pNode) ) - continue; - Vec_PtrPush( vNodes, pNode ); - pNode->fMarkA = 1; - } - // process the nodes - Vec_PtrForEachEntry( vNodes, pNode, i ) - { - // get the number of latches to retime - nLatches = Abc_ObjFanoutLMin(pNode); - if ( nLatches == 0 ) - continue; - assert( nLatches > 0 ); - // subtract these latches on the fanout side - Abc_ObjForEachFanout( pNode, pFanout, k ) - Abc_ObjAddFanoutL( pNode, pFanout, -nLatches ); - // add these latches on the fanin size - Abc_ObjForEachFanin( pNode, pFanin, k ) - { - Abc_ObjAddFaninL( pNode, k, nLatches ); - if ( Abc_ObjIsPi(pFanin) || Abc_NodeIsConst(pFanin) ) - continue; - if ( pFanin->fMarkA == 0 ) - { // schedule the node for updating - Vec_PtrPush( vNodes, pFanin ); - pFanin->fMarkA = 1; - } - } - // unmark the node as processed - pNode->fMarkA = 0; - } - Vec_PtrFree( vNodes ); - // clean the marks - Abc_NtkForEachNode( pNtk, pNode, i ) - { - pNode->fMarkA = 0; - if ( Abc_NodeIsConst(pNode) ) - continue; -// assert( Abc_ObjFanoutLMin(pNode) == 0 ); - } -} - - -//////////////////////////////////////////////////////////////////////// -/// END OF FILE /// -//////////////////////////////////////////////////////////////////////// - - |