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IV57427: REGISTER MOVES VIA STACK BEFORE AND AFTER INLINE ASSEMBLY

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You can track all active APARs for this component.

APAR status

  • Closed as new function.

Error description

  • Assembly requires VMX register(vs38).
    
    Compiler adds a store to stack of vs4 and loads the same value
    into vs38. This store/load could replaced by a xxlor
    instruction for performance. Same after the inline assembly.
    The compiler store vs38 and loads it to vs3.
    
    For inline assembly, instruction xxlandc could fill a VMX
    register (vs38) directly.
    

Local fix

  • N/A
    

Problem summary

  • USERS AFFECTED:
    Users who use VMX functions are affected by this issue.
    
    PROBLEM DESCRIPTION:
    The compiler was generating inefficient store/load code for VMX
    code.
    

Problem conclusion

  • The compiler has been fixed to generate better store/load
    sequences for VMX related functions.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV57427

  • Reported component name

    XL C/C++ FOR AI

  • Reported component ID

    5725C7200

  • Reported release

    D10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-03-25

  • Closed date

    2014-09-26

  • Last modified date

    2014-09-26

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

Fix information

  • Fixed component name

    XL C FOR AIX

  • Fixed component ID

    5725C7100

Applicable component levels

  • RD10 PSY

       UP



Document information

More support for: XL C for AIX
Compiler

Software version: 13.1

Reference #: IV57427

Modified date: 26 September 2014