[Bug tree-optimization/97333] [gimple_can_duplicate_bb_p == false, tree-ssa-threadupdate] ICE in duplicate_block, at cfghooks.c:1093

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97333

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #1)
> (because well, on GIMPLE we can duplicate all blocks).

I'm not sure I understand why, given that tracer.c has a can_duplicate_bb_p
that sometimes returns false.  Sent an RFC patch to ask for clarification:
https://gcc.gnu.org/pipermail/gcc-patches/2020-October/555890.html .