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* [Bug c++/105509] New: [compatibility] f16 suffix not supported in C++ mode - unable to find numeric literal operator ‘operator""f16’
@ 2022-05-06 15:54 thiago at kde dot org
2022-05-06 17:40 ` [Bug c++/105509] " hjl.tools at gmail dot com
` (3 more replies)
0 siblings, 4 replies; 5+ messages in thread
From: thiago at kde dot org @ 2022-05-06 15:54 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105509
Bug ID: 105509
Summary: [compatibility] f16 suffix not supported in C++ mode -
unable to find numeric literal operator
‘operator""f16’
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: thiago at kde dot org
Target Milestone: ---
The following code:
_Float16 f = 12.34f16;
compiles as C in GCC12, and as both C and C++ with Clang 14 and ICX 2022.
But with GCC 12 as C++, it generates:
error: unable to find numeric literal operator ‘operator""f16’
See also https://wg21.link/p1467, notably section 5.10 Literal suffixes
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/105509] [compatibility] f16 suffix not supported in C++ mode - unable to find numeric literal operator ‘operator""f16’
2022-05-06 15:54 [Bug c++/105509] New: [compatibility] f16 suffix not supported in C++ mode - unable to find numeric literal operator ‘operator""f16’ thiago at kde dot org
@ 2022-05-06 17:40 ` hjl.tools at gmail dot com
2022-05-06 17:44 ` redi at gcc dot gnu.org
` (2 subsequent siblings)
3 siblings, 0 replies; 5+ messages in thread
From: hjl.tools at gmail dot com @ 2022-05-06 17:40 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105509
--- Comment #1 from H.J. Lu <hjl.tools at gmail dot com> ---
_Float16 was added for AVX512FP16 as a C++ extention. The fN suffixes were
added by
https://gcc.gnu.org/git/?p=gcc.git;a=commit;h=c65699efcce48d68ef57ab3ce7fc5420fac5cbf9
which has
C++ note: no support for the new types or constant suffixes is added
for C++. C++ decimal floating-point support was very different from
the C support, using class types, and the same may well apply to any
future C++ bindings for IEEE interchange and extended types. There is
a case, however, for supporting at least *f128 constants in C++, so
that code using __float128 can use the newer style for constants
throughout rather than needing to use the older *q constants in C++.
Also, if built-in functions are added that may provide a way in which
the types could leak into C++ code.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/105509] [compatibility] f16 suffix not supported in C++ mode - unable to find numeric literal operator ‘operator""f16’
2022-05-06 15:54 [Bug c++/105509] New: [compatibility] f16 suffix not supported in C++ mode - unable to find numeric literal operator ‘operator""f16’ thiago at kde dot org
2022-05-06 17:40 ` [Bug c++/105509] " hjl.tools at gmail dot com
@ 2022-05-06 17:44 ` redi at gcc dot gnu.org
2022-05-09 8:00 ` rguenth at gcc dot gnu.org
2022-12-09 15:20 ` pinskia at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: redi at gcc dot gnu.org @ 2022-05-06 17:44 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105509
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Thiago Macieira from comment #0)
> See also https://wg21.link/p1467, notably section 5.10 Literal suffixes
That isn't supported yet *at all*. And it's not in the C++ draft yet.
The current support in G++ is just "some of the C stuff as an extension", not
an attempt to implement P1467. We will need the f16 suffix for C++23 eventually
though.
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/105509] [compatibility] f16 suffix not supported in C++ mode - unable to find numeric literal operator ‘operator""f16’
2022-05-06 15:54 [Bug c++/105509] New: [compatibility] f16 suffix not supported in C++ mode - unable to find numeric literal operator ‘operator""f16’ thiago at kde dot org
2022-05-06 17:40 ` [Bug c++/105509] " hjl.tools at gmail dot com
2022-05-06 17:44 ` redi at gcc dot gnu.org
@ 2022-05-09 8:00 ` rguenth at gcc dot gnu.org
2022-12-09 15:20 ` pinskia at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: rguenth at gcc dot gnu.org @ 2022-05-09 8:00 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105509
Richard Biener <rguenth at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Severity|normal |enhancement
Keywords| |rejects-valid
^ permalink raw reply [flat|nested] 5+ messages in thread
* [Bug c++/105509] [compatibility] f16 suffix not supported in C++ mode - unable to find numeric literal operator ‘operator""f16’
2022-05-06 15:54 [Bug c++/105509] New: [compatibility] f16 suffix not supported in C++ mode - unable to find numeric literal operator ‘operator""f16’ thiago at kde dot org
` (2 preceding siblings ...)
2022-05-09 8:00 ` rguenth at gcc dot gnu.org
@ 2022-12-09 15:20 ` pinskia at gcc dot gnu.org
3 siblings, 0 replies; 5+ messages in thread
From: pinskia at gcc dot gnu.org @ 2022-12-09 15:20 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105509
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |DUPLICATE
Status|UNCONFIRMED |RESOLVED
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Dup of bug 106652. f16 was added for GCC 13.
*** This bug has been marked as a duplicate of bug 106652 ***
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2022-12-09 15:20 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2022-05-06 15:54 [Bug c++/105509] New: [compatibility] f16 suffix not supported in C++ mode - unable to find numeric literal operator ‘operator""f16’ thiago at kde dot org
2022-05-06 17:40 ` [Bug c++/105509] " hjl.tools at gmail dot com
2022-05-06 17:44 ` redi at gcc dot gnu.org
2022-05-09 8:00 ` rguenth at gcc dot gnu.org
2022-12-09 15:20 ` pinskia at gcc dot gnu.org
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