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5ad449c398
The z13/vector-optimized wcsncmp implementation segfaults if n=1 and there is only one character (equal on both strings) before the page end. Then it loads and compares one character and misses to check n again. The following load fails. This patch removes the extra load and compare of the first character and just start with the loop which uses vector-load-to-block-boundary. This code-path also checks n. With this patch both tests are passing: - the simplified one mentioned in the bugzilla 31934 - the full one in Florian Weimer's patch: "manual: Document a GNU extension for strncmp/wcsncmp" (https://patchwork.sourceware.org/project/glibc/patch/874j9eml6y.fsf@oldenburg.str.redhat.com/): On s390x-linux-gnu (z16), the new wcsncmp test fails due to bug 31934. Reviewed-by: Carlos O'Donell <carlos@redhat.com> (cherry picked from commit 9b7651410375ec8848a1944992d663d514db4ba7)