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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/101649] -Wdouble-promotion warning emitted when floating
 point literals are not actually promoted to doubles
Date: Wed, 28 Jul 2021 06:33:00 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101649

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2021-07-28
     Ever confirmed|0                           |1

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
I agree with your reasoning from a QOI perspective.  Now, the warning is
currently implemented where the language specified promotion happens and the
optimization back to float precision happens elsewhere.  I suppose we could
anticipate this - or at least not do this optimization at -O0.=