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From: "rsandifo at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/22326] promotions (from float to double) are
 not removed when they should be able to
Date: Tue, 24 Nov 2020 10:00:42 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D22326

--- Comment #12 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.o=
rg> ---
(In reply to rguenther@suse.de from comment #11)
> The larger expressions should be subject to a propagation pass and not
> arbitrarily complex static pattern matching.  Maybe backprop is a suitable
> one to wire this in.
Sounds good.  backprop was originally added to deal with a similar
=E2=80=9Cmove things out of fold-const.c=E2=80=9D problem (which is why it'=
s currently
so special-purpose).=