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-rw-r--r--src/base/abci/abcSpeedup.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/base/abci/abcSpeedup.c b/src/base/abci/abcSpeedup.c
index 779fde62..35a901ad 100644
--- a/src/base/abci/abcSpeedup.c
+++ b/src/base/abci/abcSpeedup.c
@@ -444,7 +444,7 @@ void Abc_NtkSpeedupNode( Abc_Ntk_t * pNtk, Abc_Ntk_t * pAig, Abc_Obj_t * pNode,
// create choice node
pAnd = Abc_ObjRegular(pNode->pCopy); // repr
pObj = Abc_ObjRegular(ppCofs[0]); // new
- if ( pAnd->pData == NULL && pObj->pData == NULL && !Abc_AigCheckTfi(pObj, pAnd) )
+ if ( pAnd->pData == NULL && pObj->pData == NULL && !Abc_AigNodeIsConst(pObj) && !Abc_AigCheckTfi(pObj, pAnd) )
{
pObj->pData = pAnd->pData;
pAnd->pData = pObj;