Enterprise COBOL for z/OS , V5.1 introduces two significant compiler options.
Based on new code generation and optimization technology the new ARCH -The syntax is ARCH(n). Parameter n is an integer between 6 and 10 inclusive, specifying the machine architecture for which instructions are to be generated. ARCH(6) is default.
Related: Mainframe+COBOL Jobs
Enhanced OPTIMIZE compiler options allow you to maximize the delivery of z/Architecture exploitation and performance optimization within your applications.
Click here for different compiler options in COBOL V5 or later.