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Status Delivered
Workspace COBOL Compilers
Created by Guest
Created on Oct 17, 2015

RELATED IDEAS

Cob5: Compiler directive to control inlining

See this idea on ideas.ibm.com

Part of cobol's optimization strategies is inlining of performed sections/paragraphs. This strategy fails to provide any benefit at execution time for certain programming styles, where the mainline code contains many performs to error checking routines, e.q. many SQL followed by Perform to common check routine:

EXEC SQL ... END-EXEC
If SQLCODE Not = 0 Perform 999-Check-SQLCODE End-If

Another often used style is to Perform into a Section, which logs some error condition and eventually calls a common abend sub program to terminate the enclave.

When such Performs are heavily coded in a program, the compilation with optimize(1|2) yields to a big increase of the code size (and the compilation time) while decreasing the efficiency of the code because the inlined code is very seldom executed at execution time and only pollutes the instruction cache.

The C compiler supports #pragma directives like inline|noinline and function specifiers like inline or _Noreturn to help the optimizer to produce more efficient code.

I propose to provide similar Cobol Compiler Directive Statements to guide Cobol's optimization.

Idea priority Medium
  • Guest
    Reply
    |     Sep 28, 2017

    This has been delivered in V6.2

  • Guest
    Reply
    |     Jun 7, 2017

    Delivered for Enterprise Cobol V6 ?

  • Guest
    Reply
    |     Nov 25, 2015

    This is a valid RFE request and we will be accepting it.

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