Landing: 79e29562907b

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Project / Subsystem

gcc / libstdc++

Date

2026-02-26

Author

Avi Kivity

Commit

79e29562907b454cdb867195b34cf63156d2d0cc

Source

github

Perf win

Yes

Breaking

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All attributes

project: gcc
subsystem: libstdc++
patch_id: —
commit_hash: 79e29562907b454cdb867195b34cf63156d2d0cc
source_type: github
headline: libstdc++: Optimize std::uninitialized_move to use memcpy when possible.
tldr: `std::uninitialized_move` and `std::uninitialized_move_n` are optimized to use `memcpy` when iterators are pointers, improving performance.
author: Avi Kivity
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • libstdc++
• optimization
• memory
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/79e29562907b454cdb867195b34cf63156d2d0cc
date: 2026-02-26T00:00:00.000Z

std::uninitialized_move and std::uninitialized_move_n in libstdc++ are now optimized to use memcpy when the iterators are raw pointers. Previously, the optimization was missed because the move iterator wasn’t unwrapped before calling std::uninitialized_copy. This change improves performance when moving POD types.