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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/109359] [12/13 Regression] Compile-time rounding of double
 literal to float is incorrect with -frounding-math
Date: Fri, 31 Mar 2023 13:23:20 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
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X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.0
X-Bugzilla-Keywords: needs-bisection, wrong-code
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X-Bugzilla-Who: rguenth at gcc dot gnu.org
X-Bugzilla-Status: NEW
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X-Bugzilla-Priority: P3
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X-Bugzilla-Target-Milestone: 12.3
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109359

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2023-03-31
   Target Milestone|---                         |12.3
            Summary|Compile-time rounding of    |[12/13 Regression]
                   |double literal to float is  |Compile-time rounding of
                   |incorrect with              |double literal to float is
                   |-frounding-math             |incorrect with
                   |                            |-frounding-math
           Keywords|                            |needs-bisection, wrong-code
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Richard Biener <rguenth at gcc dot gnu.org> ---
With -frounding-math:

xs:
        .long   -639366012
        .long   1063214053
        .long   536561674
        .long   1071918432

without:

xs:
        .long   989519663
        .long   1059154689

it looks like we fail to convert the double constant to single precision
and then end up outputting the double precision constants ...

The C frontend works.=