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target/s390x: Fix the "ignored match" case in VSTRS
Currently the emulation of VSTRS recognizes partial matches in presence of \0 in the haystack, which, according to PoP, is not correct: If the ZS flag is one and a zero byte was detected in the second operand, then there can not be a partial match ... Add a check for this. While at it, fold a number of explicitly handled special cases into the generic logic. Cc: qemu-stable@nongnu.org Reported-by: Claudio Fontana <cfontana@suse.de> Closes: https://lists.gnu.org/archive/html/qemu-devel/2023-08/msg00633.html Fixes: 1d706f3 ("target/s390x: vxeh2: vector string search") Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Message-Id: <20230804233748.218935-3-iii@linux.ibm.com> Tested-by: Claudio Fontana <cfontana@suse.de> Acked-by: David Hildenbrand <david@redhat.com> Signed-off-by: Thomas Huth <thuth@redhat.com> (cherry picked from commit 791b2b6) Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
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