From: trevor_hansen <trevor_hansen@e59a4935-1847-0410-ae03-e826735625c1>
Date: Thu, 12 May 2011 04:28:04 +0000 (+0000)
Subject: Extra simplification rule.
X-Git-Url: https://git.unchartedbackwaters.co.uk/w/?a=commitdiff_plain;h=e0be42c1ea052a620e7d495433e400fc8880c979;p=francis%2Fstp.git

Extra simplification rule.

git-svn-id: https://stp-fast-prover.svn.sourceforge.net/svnroot/stp-fast-prover/trunk/stp@1334 e59a4935-1847-0410-ae03-e826735625c1
---

diff --git a/src/AST/NodeFactory/SimplifyingNodeFactory.cpp b/src/AST/NodeFactory/SimplifyingNodeFactory.cpp
index dd3836e..e7566f5 100644
--- a/src/AST/NodeFactory/SimplifyingNodeFactory.cpp
+++ b/src/AST/NodeFactory/SimplifyingNodeFactory.cpp
@@ -134,7 +134,8 @@ ASTNode SimplifyingNodeFactory::CreateNode(Kind kind, const ASTVec & children)
                       result = NodeFactory::CreateNode(BEEV::NOT, NodeFactory::CreateNode(BEEV::EQ, children[0], children[1]));
                 if (children[0].isConstant() && CONSTANTBV::BitVector_is_full(children[0].GetBVConst()))
                       result = NodeFactory::CreateNode(BEEV::NOT, NodeFactory::CreateNode(BEEV::EQ, children[0], children[1]));
-
+                if (children[0].GetKind() ==BEEV::BVAND && children[0].Degree() > 1 && ((children[0][0] == children[1]) || children[0][1] == children[1]))
+                    result = ASTFalse;
 		break;
 
 	case BEEV::BVGE: