[Bug target/88906] wrong code with -march=k6 -minline-all-stringops -minline-stringops-dynamically -mmemcpy-strategy=libcall:-1:align and vector argument

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88906

--- Comment #5 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #4)
> Hard to bisect, because before r233979 this used to ICE or segfault in the
> compiler, starting with r201645 when -mmemcpy-strategy= option has been
> added, and already r233979 generates wrong-code.

Please see #3 comment. The RTL expansion of a memcpy does not mark pointers as
escaping. DSE1 pass later deduces that memory region, pointed by src pointer is
unused and removes its initialization.