From: trevor_hansen <trevor_hansen@e59a4935-1847-0410-ae03-e826735625c1>
Date: Thu, 2 Feb 2012 12:29:35 +0000 (+0000)
Subject: Search for a AND (NOT a), a OR (NOT a), when doing node creation. This is necessary... 
X-Git-Url: https://git.unchartedbackwaters.co.uk/w/?a=commitdiff_plain;h=40a07505b404fcd11f664b51f4faab912107cdda;p=francis%2Fstp.git

Search for a AND (NOT a), a OR (NOT a), when doing node creation. This is necessary on some sage benchmarks.

git-svn-id: https://stp-fast-prover.svn.sourceforge.net/svnroot/stp-fast-prover/trunk/stp@1550 e59a4935-1847-0410-ae03-e826735625c1
---

diff --git a/src/AST/NodeFactory/SimplifyingNodeFactory.cpp b/src/AST/NodeFactory/SimplifyingNodeFactory.cpp
index 1302198..e52ce5a 100644
--- a/src/AST/NodeFactory/SimplifyingNodeFactory.cpp
+++ b/src/AST/NodeFactory/SimplifyingNodeFactory.cpp
@@ -338,6 +338,10 @@ SimplifyingNodeFactory::CreateSimpleAndOr(bool IsAnd, const ASTVec &children)
       else
         next_it = it_end;
 
+      if (nextexists)
+        if (next_it->GetKind() == BEEV::NOT && (*next_it)[0] == *it)
+          return annihilator;
+
       if (*it == annihilator)
         {
           return annihilator;