[Bug middle-end/39326] Segmentation fault with -O1, out of memory with -O2

[sergstesh at yahoo dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=39326

--- Comment #56 from Sergei Steshenko <sergstesh at yahoo dot com> ---
"-O2 ... and 820MB peak memory use" vs "-O3 ... and 700MB peak memory use" -
according to my common sense -O3 is stronger than -02 optimization, and one
should expect greater memory use.

So, can the above be an indication of yet another bug ? I.e. -O3 in reality
does not do something it is supposed to do while -O2 does this ?