https://bugs.kde.org/show_bug.cgi?id=419503

            Bug ID: 419503
           Summary: s390x: Avoid modifying registers returned from isel
                    functions
           Product: valgrind
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: vex
          Assignee: jsew...@acm.org
          Reporter: ar...@linux.ibm.com
  Target Milestone: ---

As discussed with Julian Seward, host_s390_isel.c contains some questionable
logic where registers returned from isel functions are potentially modified, or
where it is not sufficiently made clear that they are always left unmodified.

As a general rule, rather than modifying a register returned by one of the isel
functions, the register should be copied first and the copy modified instead.

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