[Bug tree-optimization/61619] Benefits from -ftree-vectorize lost easily when changing unrelated code

[glisse at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61619

--- Comment #2 from Marc Glisse <glisse at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #1)
> Unfortunately the inits look like
> 
>   [/usr/include/c++/4.9/bits/stl_algobase.h : 378:6] MEM[(char *
> {ref-all})&S] = MEM[(char * {ref-all})&._94];
>   pretmp_22 = MEM[(struct array *)&S];
> 
> which we don't fold to the constant init 1 for some reason.

Sounds related to PR 59611 (I didn't look at this one closely, so maybe not).