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From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug tree-optimization/97333] [gimple_can_duplicate_bb_p == false,
 tree-ssa-threadupdate] ICE in duplicate_block, at cfghooks.c:1093
Date: Thu, 15 Oct 2020 08:51:31 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97333

--- Comment #3 from Tom de Vries <vries at gcc dot gnu.org> ---
(In reply to Tom de Vries from comment #2)
> (In reply to Richard Biener from comment #1)
> > (because well, on GIMPLE we can duplicate all blocks).
>=20
> 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 .

Committed as "[gimple] Move can_duplicate_bb_p to gimple_can_duplicate_bb_p=
" (
https://gcc.gnu.org/git/?p=3Dgcc.git;a=3Dcommit;h=3D17d5739a6b103cdd3315f5d=
0e09fe8faa6620a03
).

Now gimple_can_duplicate_bb_p can return false.=