Valgrind currently lacks support for the z/Architecture vector string instructions introduced with z13. These are documented in the z/Architecture Principles of Operation, Eleventh Edition (March, 2015), chapter 23: "Vector String Instructions".
Note that I will submit patch after closing 385408 issue. The reason to do so is to avoid code dublicating.
Created attachment 109789 [details] Vector string support for s390x z13 Vector string patch: It is supposed to be applied after this attachment 109672 [details] from the bug 385408. Please check it out.
Since the "support" patch is merged this "string" patch can be applied directly to master.
Created attachment 110181 [details] Vector string support for s390x z13 Changes: Verified the fact that this patch can be applied on master Small optimization for VPKS and VPKLS
Please not that last attachment 110181 [details] has been merged into "vector integer" one (located in bug 385409). The reason to do so is that it's small and code from here is used in "vector integer" patch.
Created attachment 114121 [details] Vector string support for s390x z13 Changes: Now this patch can be applied on master (on d44563c49e55f47016e23591f708c7aa57f7a098 or later commit)
This is fixed by the patches discussed in Bug 385409, which have been pushed upstream now.