[Bug tree-optimization/118569] [15 regression] ICE on valid code at -O3 with "-fno-tree-ch -fno-tree-ccp -fno-tree-fre" on x86_64-linux-gnu: in check_loop_closed_ssa_def, at tree-ssa-loop-manip.cc:647 since r15-80

[rguenth at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118569

Richard Biener <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |rguenth at gcc dot 
gnu.org
             Status|NEW                         |ASSIGNED

--- Comment #2 from Richard Biener <rguenth at gcc dot gnu.org> ---
Yep, it's almost the same issue.  So it's not only uses on the exit of the
inner loop (which would have now misplaced PHIs) but uses inside of the
loop as well.  We have to scan _all_ blocks of loops whose nesting relationship
changes.  In fact we already do this in the fix_bb_placements caller of
fix_loop_placement.