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Diffstat (limited to 'src/base/abcs/abcRetUtil.c')
| -rw-r--r-- | src/base/abcs/abcRetUtil.c | 244 |
1 files changed, 0 insertions, 244 deletions
diff --git a/src/base/abcs/abcRetUtil.c b/src/base/abcs/abcRetUtil.c deleted file mode 100644 index 9a283e03..00000000 --- a/src/base/abcs/abcRetUtil.c +++ /dev/null @@ -1,244 +0,0 @@ -/**CFile**************************************************************** - - FileName [abcRetUtil.c] - - SystemName [ABC: Logic synthesis and verification system.] - - PackageName [Network and node package.] - - Synopsis [Retiming utilities.] - - Author [Alan Mishchenko] - - Affiliation [UC Berkeley] - - Date [Ver. 1.0. Started - June 20, 2005.] - - Revision [$Id: abcRetUtil.c,v 1.00 2005/06/20 00:00:00 alanmi Exp $] - -***********************************************************************/ - -#include "abcs.h" - -//////////////////////////////////////////////////////////////////////// -/// DECLARATIONS /// -//////////////////////////////////////////////////////////////////////// - -//////////////////////////////////////////////////////////////////////// -/// FUNCTION DEFINITIONS /// -//////////////////////////////////////////////////////////////////////// - -/**Function************************************************************* - - Synopsis [Performs forward retiming of the sequential AIG.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Vec_Ptr_t * Abc_NtkUtilRetimingTry( Abc_Ntk_t * pNtk, bool fForward ) -{ - Vec_Ptr_t * vNodes, * vMoves; - Abc_Obj_t * pNode, * pFanout, * pFanin; - int i, k, nLatches; - assert( Abc_NtkIsSeq( pNtk ) ); - // assume that all nodes can be retimed - vNodes = Vec_PtrAlloc( 100 ); - Abc_AigForEachAnd( pNtk, pNode, i ) - { - Vec_PtrPush( vNodes, pNode ); - pNode->fMarkA = 1; - } - // process the nodes - vMoves = Vec_PtrAlloc( 100 ); - Vec_PtrForEachEntry( vNodes, pNode, i ) - { -// printf( "(%d,%d) ", Abc_ObjFaninL0(pNode), Abc_ObjFaninL0(pNode) ); - // unmark the node as processed - pNode->fMarkA = 0; - // get the number of latches to retime - if ( fForward ) - nLatches = Abc_ObjFaninLMin(pNode); - else - nLatches = Abc_ObjFanoutLMin(pNode); - if ( nLatches == 0 ) - continue; - assert( nLatches > 0 ); - // retime the latches forward - if ( fForward ) - Abc_ObjRetimeForwardTry( pNode, nLatches ); - else - Abc_ObjRetimeBackwardTry( pNode, nLatches ); - // write the moves - for ( k = 0; k < nLatches; k++ ) - Vec_PtrPush( vMoves, pNode ); - // schedule fanouts for updating - if ( fForward ) - { - Abc_ObjForEachFanout( pNode, pFanout, k ) - { - if ( Abc_ObjFaninNum(pFanout) != 2 || pFanout->fMarkA ) - continue; - pFanout->fMarkA = 1; - Vec_PtrPush( vNodes, pFanout ); - } - } - else - { - Abc_ObjForEachFanin( pNode, pFanin, k ) - { - if ( Abc_ObjFaninNum(pFanin) != 2 || pFanin->fMarkA ) - continue; - pFanin->fMarkA = 1; - Vec_PtrPush( vNodes, pFanin ); - } - } - } - Vec_PtrFree( vNodes ); - // make sure the marks are clean the the retiming is final - Abc_AigForEachAnd( pNtk, pNode, i ) - { - assert( pNode->fMarkA == 0 ); - if ( fForward ) - assert( Abc_ObjFaninLMin(pNode) == 0 ); - else - assert( Abc_ObjFanoutLMin(pNode) == 0 ); - } - return vMoves; -} - -/**Function************************************************************* - - Synopsis [Translates retiming steps into retiming moves.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Vec_Ptr_t * Abc_NtkUtilRetimingGetMoves( Abc_Ntk_t * pNtk, Vec_Int_t * vSteps, bool fForward ) -{ - Abc_RetStep_t RetStep; - Vec_Ptr_t * vMoves; - Abc_Obj_t * pNode; - int i, k, iNode, nLatches, Number; - int fChange; - assert( Abc_NtkIsSeq( pNtk ) ); - // process the nodes - vMoves = Vec_PtrAlloc( 100 ); - while ( Vec_IntSize(vSteps) > 0 ) - { - iNode = 0; - fChange = 0; - Vec_IntForEachEntry( vSteps, Number, i ) - { - // get the retiming step - RetStep = Abc_Int2RetStep( Number ); - // get the node to be retimed - pNode = Abc_NtkObj( pNtk, RetStep.iNode ); - assert( RetStep.nLatches > 0 ); - // get the number of latches that can be retimed - if ( fForward ) - nLatches = Abc_ObjFaninLMin(pNode); - else - nLatches = Abc_ObjFanoutLMin(pNode); - if ( nLatches == 0 ) - { - Vec_IntWriteEntry( vSteps, iNode++, Abc_RetStep2Int(RetStep) ); - continue; - } - assert( nLatches > 0 ); - fChange = 1; - // get the number of latches to be retimed over this node - nLatches = ABC_MIN( nLatches, (int)RetStep.nLatches ); - // retime the latches forward - if ( fForward ) - Abc_ObjRetimeForwardTry( pNode, nLatches ); - else - Abc_ObjRetimeBackwardTry( pNode, nLatches ); - // write the moves - for ( k = 0; k < nLatches; k++ ) - Vec_PtrPush( vMoves, pNode ); - // subtract the retiming performed - RetStep.nLatches -= nLatches; - // store the node if it is not retimed completely - if ( RetStep.nLatches > 0 ) - Vec_IntWriteEntry( vSteps, iNode++, Abc_RetStep2Int(RetStep) ); - } - // reduce the array - Vec_IntShrink( vSteps, iNode ); - if ( !fChange ) - { - printf( "Warning: %d strange steps.\n", Vec_IntSize(vSteps) ); - /* - Vec_IntForEachEntry( vSteps, Number, i ) - { - RetStep = Abc_Int2RetStep( Number ); - printf( "%d(%d) ", RetStep.iNode, RetStep.nLatches ); - } - printf( "\n" ); - */ - break; - } - } - // undo the tentative retiming - if ( fForward ) - { - Vec_PtrForEachEntryReverse( vMoves, pNode, i ) - Abc_ObjRetimeBackwardTry( pNode, 1 ); - } - else - { - Vec_PtrForEachEntryReverse( vMoves, pNode, i ) - Abc_ObjRetimeForwardTry( pNode, 1 ); - } - return vMoves; -} - - -/**Function************************************************************* - - Synopsis [Splits retiming into forward and backward.] - - Description [] - - SideEffects [] - - SeeAlso [] - -***********************************************************************/ -Vec_Int_t * Abc_NtkUtilRetimingSplit( Vec_Str_t * vLags, int fForward ) -{ - Vec_Int_t * vNodes; - Abc_RetStep_t RetStep; - int Value, i; - vNodes = Vec_IntAlloc( 100 ); - Vec_StrForEachEntry( vLags, Value, i ) - { -// assert( Value <= ABC_MAX_EDGE_LATCH ); - if ( Value < 0 && fForward ) - { - RetStep.iNode = i; - RetStep.nLatches = -Value; - Vec_IntPush( vNodes, Abc_RetStep2Int(RetStep) ); - } - else if ( Value > 0 && !fForward ) - { - RetStep.iNode = i; - RetStep.nLatches = Value; - Vec_IntPush( vNodes, Abc_RetStep2Int(RetStep) ); - } - } - return vNodes; -} - -//////////////////////////////////////////////////////////////////////// -/// END OF FILE /// -//////////////////////////////////////////////////////////////////////// - - |