https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83213
Martin Liška <marxin at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Last reconfirmed| |2017-12-20
CC| |marxin at gcc dot gnu.org
--- Comment #5 from Martin Liška <marxin at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #4)
> My bisection says it starts with r249104, but that doesn't make sense, so it
> is likely r249097 or r249098 or some other change from that time.
One needs to tweak a bit flags, so with:
$ gcc pr83213.c -O2 -Wno-implicit-function-declaration -c -freorder-functions
-freorder-blocks-and-partition -fprofile-use
It started in r249013 which is:
SVN revision: 249013
Author: hubicka
* predict.c (maybe_hot_bb_p): Do not check profile status.
(maybe_hot_edge_p): Likewise.
(probably_never_executed): Check for zero counts even if profile
is not read.
(unlikely_executed_edge_p): New function.
(unlikely_executed_stmt_p): New function.
(unlikely_executed_bb_p): New function.
(set_even_probabilities): Use unlikely predicates.
(combine_predictions_for_bb): Likewise.
(predict_paths_for_bb): Likewise.
(predict_paths_leading_to_edge): Likewise.
(determine_unlikely_bbs): New function.
(estimate_bb_frequencies): Use it.
(compute_function_frequency): Use zero counts even if profile is
not read.
* profile-count.h: Fix typo.
* g++.dg/tree-ssa/counts-1.C: New testcase.
* gcc.dg/tree-ssa/counts-1.c: New testcase.
It's also not real trigger as it only fixes some predicates related to hotness
of a basic-block.
