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Status Not under consideration
Workspace IBM High Level Assembler for z/OS and z/VM
Categories Toolkit
Created by Guest
Created on Nov 19, 2024

RELATED IDEAS

Support JXH and JXLE for exit t the beginning of a loop

Support JXH and JXLE for, e.g., ASMEXIT, DO WHILE, DOEXIT, IF, for testing loop termination at the beginning.

Idea priority Medium
  • Guest
    Reply
    |     Nov 27, 2024
    Thank you for providing an example, which has helped us to understand your request. However, the value for effort does not seem very significant, and changing this area is tricky and needs great care to avoid breaking anything. And it does seem like a very niche requirement. Given limited resources and other priorities, we therefore do not expect to implement any change in this area in the near future, so we are declining this request, although we will add it to our long-term suggestion list.
  • Guest
    Reply
    |     Nov 25, 2024

    I'm not allowed to export the actual code, but this should convey the idea. The work area is initialized to zero.

    LA R2,TABLELEN

    LA R3,LAST

    LA R4,VIRTORG

    DO INF

    GET SYSIN

    JXH R4,R2,FULL

    ST R4,COMPARND

    ...

    ENDDO .

    FULL WTO 'TABLE FULL',ROUTCDE=7

    EODAD DS 0H

    ...

    IF (LT,R3,COMPARND

    LA R2,TABLELEN

    LA R4,TABLE

    DO FROM=(R4),BY=(R2),TO=(R3)

    ...

    ENDDO .

    ENDIF .

    ...

    TABLEENT DSECT ,

    FOO DS F

    BAR DS CL8

    TABLELEN DS *-TABLEENT

    ...

    WORK DSECT ,

    ...

    TABLE DS 100CL(TABLELEN)

    VIRTORG EQU TABLE-TABLELEN,TABLEN

    LAST EQU *-TABLEN,TABLEN

    COMPARND DS A(0)



    Using the proposed predicate, the first loop might look like:

    DO INF

    GET SYSIN

    DOEXIT (JXH,R4,R2)

    ST R4,COMPARND

    ...

    ENDDO .

    WTO 'TABLE FULL',ROUTCDE=7

    EODAD DS 0H


  • Guest
    Reply
    |     Nov 21, 2024

    For this type of loop, the initial value is the virtual origin so that it points to the first entry after the first incrementation.

  • Guest
    Reply
    |     Nov 21, 2024
    Loops using BXH/BXLE or equivalently JXH/JXLE do not use that instruction before the first iteration because that would increment the index before the loop, skipping the initial FROM value. It is usually possible to enclose a DO loop in a simple IF test to cover the case where the loop termination condition is already true.

    We need more details to understand your requirement.
    Please send us examples for each case (ASMEXIT, DO WHILE, DOEXIT, IF) you have mentioned.

    Regards,
    Ramesh Padmanabha, HLASM
  • Guest
    Reply
    |     Nov 20, 2024
    Development team will review the Idea

    Thanks, Ramesh Padmanabha, HLASM

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