Landing: 4ff92b02340c

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Project / Subsystem

gcc / libstdc++

Date

2026-09-11

Author

Jakub Jelinek

Commit

4ff92b02340cfc54939d0411e057a7af20974d59

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: libstdc++
patch_id: —
commit_hash: 4ff92b02340cfc54939d0411e057a7af20974d59
source_type: github
headline: Libstdc++ implements C++29 P3793R2 - Better shifting.
tldr: Adds C++29 bitwise shifting operations (`shl`, `shr`) to the standard library's `<bit>` header.
author: Jakub Jelinek
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • c++29
• libstdc++
• standard library
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/4ff92b02340cfc54939d0411e057a7af20974d59
date: 2026-09-11T00:00:00.000Z

This commit implements the header functionalities for C++29’s P3793R2 proposal, commonly known as ‘Better shifting.’ It introduces new concepts like std::__signed_or_unsigned_integer and function templates std::shl and std::shr for more robust and expressive bitwise left and right shifts.