WG21 PAPERS

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Filter and export papers from the C++ Committee’s monthly mailings by time frame and audience using the options below, or refine your export further with the Select button. Links point directly to the official WG21 papers on open-std.org.

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	Paper	Title	Authors	Audience
	P3642R6	Carry-less product: std::clmul	J. Schultke	LEWG LWG
Mailing Date 2026-07 Post-Brno Author(s) Jan Schultke Target Audience LEWG LWG Revisions R5 R4 Tracking issue View on GitHub Abstract [Carry-less multiplication](https://en.wikipedia.org/wiki/Carry-less_product) is a simple numerical operation on unsigned integers. It can be a seen as a regular multiplication where `xor` is being used as a reduction instead of `+`.
	P3935R2	Rebasing <cmath> on C23	J. Schultke	LEWG
Mailing Date 2026-07 Post-Brno Author(s) Jan Schultke Target Audience LEWG Revisions R1 Tracking issue View on GitHub Abstract [[P3348R4]](https://wg21%2elink/p3348r4) rebased the C++26 standard on C23; it previously referred to C17. However, this process was deliberately left incomplete: some of the new C23 `<math.h>` features are only used by decimal floating-point types, or they require core language changes, etc.
	P3969R2	Fixing std::bit_cast of types with padding bits	J. Schultke	LEWG
Mailing Date 2026-07 Post-Brno Author(s) Jan Schultke Target Audience LEWG Revisions R1 R0 Tracking issue View on GitHub Abstract > The following use of `std::bit_cast` has undefined behavior at compile time: > > ```cpp > constexpr auto x = std::bit_cast<__int128>(0.0L); // GCC accepts (x = 0), Clang rejects > ``` > > That is because an 80-bit x87 `long double` has 6 bytes of padding, and it is undefined behavior to map those padding bits onto non-padding bits in the destination type via `std::bit_cast`. [[bit.cast]](https:/
	P4157R1	LEWG Slides for P3666R4	J. Schultke	EWG LEWG
Mailing Date 2026-07 Post-Brno Author(s) Jan Schultke Target Audience EWG LEWG Revisions R0 Tracking issue View on GitHub Abstract C23 now has `_BitInt` type for N-bit integers (WG14 N2763, N2775):
	P4279R0	No Endian Views	J. Schultke	LEWG
Mailing Date 2026-07 Post-Brno Author(s) Jan Schultke Target Audience LEWG Tracking issue View on GitHub Abstract The design direction of [[P4030R1]](https://isocpp%2eorg/files/papers/P4030R1%2ehtml) Endian Views should not be pursued.
	P4305R0	Design problems with P2964R5 (User-defined element types in std::simd)	J. Schultke	LEWG
Mailing Date 2026-07 Post-Brno Author(s) Jan Schultke Target Audience LEWG Tracking issue View on GitHub Abstract This paper discusses some design problems in [[P2964R5]](https://isocpp%2eorg/files/papers/P2964R5%2ehtml).

Showing 6 of 6 papers · source: open-std.org

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