From fa486f5b44790e5abda28ddb2b798d0b1408269f Mon Sep 17 00:00:00 2001
From: Yoichi Hirai <i@yoichihirai.com>
Date: Thu, 24 Nov 2016 17:03:17 +0100
Subject: codegen: shorten the bit truncation

---
 libsolidity/codegen/CompilerUtils.cpp | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

(limited to 'libsolidity/codegen')

diff --git a/libsolidity/codegen/CompilerUtils.cpp b/libsolidity/codegen/CompilerUtils.cpp
index 21dd2840..41559a42 100644
--- a/libsolidity/codegen/CompilerUtils.cpp
+++ b/libsolidity/codegen/CompilerUtils.cpp
@@ -492,11 +492,8 @@ void CompilerUtils::convertType(Type const& _typeOnStack, Type const& _targetTyp
 				{
 					if (typeOnStack.numBits() < 256)
 						m_context
-							<< (u256(1) << (256 - typeOnStack.numBits()))
-							<< Instruction::SWAP1
-							<< Instruction::DUP2
-							<< Instruction::MUL
-							<< Instruction::DIV;
+							<< ((u256(1) << typeOnStack.numBits()) - 1)
+							<< Instruction::AND;
 					chopSignBitsPending = false;
 				}
 			}
-- 
cgit