Landing: 1d76ad29a174

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Project / Subsystem

gcc / cobol

Date

2026-06-09

Author

Robert Dubner

Commit

1d76ad29a174ea2b44608f2dad0954e995cca864

Source

github

Perf win

Yes

Breaking

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All attributes

project: gcc
subsystem: cobol
patch_id: —
commit_hash: 1d76ad29a174ea2b44608f2dad0954e995cca864
source_type: github
headline: COBOL COMP-3 moves now execute faster
tldr: GCC's COBOL frontend optimizes COMP-3 to COMP-3 moves by avoiding unnecessary binary conversions, directly manipulating packed-decimal bytes for improved perfo…
author: Robert Dubner
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • cobol
• optimization
• performance
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/1d76ad29a174ea2b44608f2dad0954e995cca864
date: 2026-06-09T00:00:00.000Z

The GCC COBOL compiler now performs COMP-3 to COMP-3 moves more efficiently by directly manipulating packed-decimal representations. Previously, these moves involved a slower intermediate conversion to binary and back. This change bypasses that overhead, either directly moving bytes or performing a half-byte shift when necessary, resulting in faster execution. The implementation involved refactoring move-related functionality into a new move.cc file.