Fix BYTE instruction

libevmjit/Compiler.cpp

@@ -394,7 +394,8 @@ void Compiler::compileBasicBlock(BasicBlock& _basicBlock, bytes const& _bytecode
 
 			value = Endianness::toBE(m_builder, value);
 			auto bytes = m_builder.CreateBitCast(value, llvm::VectorType::get(Type::Byte, 32), "bytes");
-			auto byte = m_builder.CreateExtractElement(bytes, byteNum, "byte");
+			auto safeByteNum = m_builder.CreateZExt(m_builder.CreateTrunc(byteNum, m_builder.getIntNTy(5)), Type::lowPrecision); // Trim index, large values can crash
+			auto byte = m_builder.CreateExtractElement(bytes, safeByteNum, "byte");
 			value = m_builder.CreateZExt(byte, Type::Word);
 
 			auto byteNumValid = m_builder.CreateICmpULT(byteNum, Constant::get(32));