From e3f1ff6980e920d64134a92971f342fabe89f5bf Mon Sep 17 00:00:00 2001
From: Cristian Cadar <cristic@cs.stanford.edu>
Date: Sat, 13 Jun 2009 02:56:57 +0000
Subject: Added a helper function to construct IFF expressions.

git-svn-id: https://llvm.org/svn/llvm-project/klee/trunk@73283 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Expr/Expr.cpp | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'lib')

diff --git a/lib/Expr/Expr.cpp b/lib/Expr/Expr.cpp
index 7b680567..695312ef 100644
--- a/lib/Expr/Expr.cpp
+++ b/lib/Expr/Expr.cpp
@@ -301,6 +301,11 @@ ref<Expr> Expr::createImplies(ref<Expr> hyp, ref<Expr> conc) {
   return OrExpr::create(Expr::createNot(hyp), conc);
 }
 
+ref<Expr> Expr::createIff(ref<Expr> e1, ref<Expr> e2) {
+  return AndExpr::create(Expr::createImplies(e1, e2), 
+			 Expr::createImplies(e2, e1));
+}
+
 ref<Expr> Expr::createIsZero(ref<Expr> e) {
   return EqExpr::create(e, ConstantExpr::create(0, e->getWidth()));
 }
-- 
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