https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110903
Thomas Koenig <tkoenig at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Summary|[12/13/14 Regression] Dead |[12/13 Regression] Dead
|Code Elimination Regression |Code Elimination Regression
--- Comment #5 from Thomas Koenig <tkoenig at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #4)
> (In reply to Thomas Koenig from comment #3)
> > The code from comment#2 and from comment#3 no longer calls foo
> > with current trunk, r14-5108-g751fc7bcdcdf25 .
> >
> > Now, to see which commit fixed it...
>
> My bet is on r14-4089-gd45ddc2c04e471 .
Weird thing is that I do see this on POWER (I often use gcc120 for
compiling because it is the beefiest machine I can lay my hands on).
However, this was actually fixed by r14-4141-gbf6b107e2a3423:
bf6b107e2a342319b3787ec960fc8014ef3aff91 is the first new commit
commit bf6b107e2a342319b3787ec960fc8014ef3aff91
Author: Andrew MacLeod <amacl...@redhat.com>
Date: Wed Sep 13 11:52:15 2023 -0400
New early __builtin_unreachable processing.
in VRP passes before __builtin_unreachable MUST be removed, only remove it
if all exports affected by the unreachable can have global values updated,
and
do not involve loads from memory.
PR tree-optimization/110080
PR tree-optimization/110249
gcc/
* tree-vrp.cc (remove_unreachable::final_p): New.
(remove_unreachable::maybe_register): Rename from
maybe_register_block and call early or final routine.
(fully_replaceable): New.
(remove_unreachable::handle_early): New.
(remove_unreachable::remove_and_update_globals): Remove
non-final processing.
(rvrp_folder::rvrp_folder): Add final flag to constructor.
(rvrp_folder::post_fold_bb): Remove unreachable registration.
(rvrp_folder::pre_fold_stmt): Move unreachable processing to here.
(execute_ranger_vrp): Adjust some call parameters.
gcc/testsuite/
* g++.dg/pr110249.C: New.
* gcc.dg/pr110080.c: New.
* gcc.dg/pr93917.c: Adjust.
