https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90055
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to Martin Liška from comment #2) > Fixed on trunk with r250959 which is: > > 364bc5b93b76cf88(08 Aug 2017 14:09): [took: 2.844s] result: OK > sum: 0.0000 > SVN revision: 250959 > Author: amker > * doc/invoke.texi: Document -ftree-loop-distribution for O3. > * opts.c (default_options_table): Add OPT_ftree_loop_distribution. > > > git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@250959 > 138bc75d-0d04-0410-961f-82ee72b054a4 > > Using: > gcc pr90055.c -O3 -ffast-math -march=haswell -mtune=haswell > -fno-tree-loop-distribution > > it disappeared in r253934: > > Author: hubicka > * x86-tune-costs.h (core_cost): Fix div, move and sqrt latencies. Those look like they are all would cause the issue to go latent. > > and it started with r238033. This one does it might be the real cause of the issue.
