[Bug middle-end/81818] aarch64 uses 2-3x memory and 2x time of arm at -Os, -O2, -O3

[rearnsha at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81818

--- Comment #9 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
(In reply to Andrew Roberts from comment #8)
> I've tried building gcc-8-20170806 and gcc-8-20170813 with
> --enable-gather-detailed-mem-stats
> 
> This fails on x86-64, arm and aarch64 with the same error.
> 
> Shall I file a separate bug report for gcc-8?
> 

Yes please.  One bug report per issue.