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

["andrewm.roberts at sky dot com" <gcc-bugzilla at gcc dot gnu dot org>]

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

--- Comment #8 from Andrew Roberts <andrewm.roberts at sky dot com> ---
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.

The recently released 7.2.0 build ok on x86-64 at least, still testing the
rest.

Shall I file a separate bug report for gcc-8?

The error is:
/home/aroberts/gcc/gcc-build/./gcc/xgcc -B/home/aroberts/gcc/gcc-build/./gcc/
-xc -nostdinc /dev/null -S -o /dev/null
-fself-test=../../gcc-8.0.0/gcc/testsuite/selftests
xgcc: internal compiler error: Segmentation fault (program cc1)
Please submit a full bug report,
with preprocessed source if appropriate.
See <https://gcc.gnu.org/bugs/> for instructions.
make[2]: *** [Makefile:1952: s-selftest-c] Error 4
rm fsf-funding.pod gcov.pod gpl.pod cpp.pod gfdl.pod gcc.pod gcov-dump.pod
gfortran.pod gcov-tool.pod
make[2]: Leaving directory '/home/aroberts/gcc/gcc-build/gcc'
make[1]: *** [Makefile:4305: all-gcc] Error 2
make[1]: Leaving directory '/home/aroberts/gcc/gcc-build'
make: *** [Makefile:918: all] Error 2