https://bugs.kde.org/show_bug.cgi?id=382041

--- Comment #1 from Julian Seward <jsew...@acm.org> ---
I'm not sure if it exactly the same, but Valgrind does already have
machinery which transforms the xor-based scheme back into the
and-or-not scheme, in order to avoid this problem.  It is disabled
by default though.  Find this at the bottom of ir_opt.c and enable
it, then see if that helps.

      ///////////////////////////////////////////////////////////
      // BEGIN MSVC optimised code transformation hacks
      if (0)
         bb = do_MSVC_HACKS(bb);
      // END   MSVC optimised code transformation hacks
      ///////////////////////////////////////////////////////////

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