https://bugs.kde.org/show_bug.cgi?id=386945

--- Comment #62 from Julian Seward <jsew...@acm.org> ---
Created attachment 116827
  --> https://bugs.kde.org/attachment.cgi?id=116827&action=edit
Possible fix for the comment 61 problems

This patch:

* changes set_AV_CR6 so that it does scalar comparisons against zero,
  rather than sometimes against an all-ones word.  This is something
  that Memcheck can instrument exactly.

* in Memcheck, requests expensive instrumentation of Iop_Cmp{EQ,NE}64
  by default on ppc64le.

Note, this is all untested!  In particular it would be good to verify
that the CR6 results are unchanged.

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