From 120438c0cf7abc506ca90221bafa2a9cbbb12994 Mon Sep 17 00:00:00 2001
From: chriseth <chris@ethereum.org>
Date: Tue, 4 Sep 2018 16:51:22 +0200
Subject: [PATCH] Always perform cleanup for EXP.

---
 libsolidity/codegen/ExpressionCompiler.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libsolidity/codegen/ExpressionCompiler.cpp b/libsolidity/codegen/ExpressionCompiler.cpp
index 4150bc11a..45e58bd07 100644
--- a/libsolidity/codegen/ExpressionCompiler.cpp
+++ b/libsolidity/codegen/ExpressionCompiler.cpp
@@ -2138,7 +2138,9 @@ bool ExpressionCompiler::cleanupNeededForOp(Type::Category _type, Token::Value _
 {
 	if (Token::isCompareOp(_op) || Token::isShiftOp(_op))
 		return true;
-	else if (_type == Type::Category::Integer && (_op == Token::Div || _op == Token::Mod))
+	else if (_type == Type::Category::Integer && (_op == Token::Div || _op == Token::Mod || _op == Token::Exp))
+		// We need cleanup for EXP because 0**0 == 1, but 0**0x100 == 0
+		// It would suffice to clean the exponent, though.
 		return true;
 	else
 		return false;