Landing: 19864661c96c

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Project / Subsystem

gcc / niter

Date

2026-04-29

Author

Michiel Derhaeg

Commit

19864661c96c457e4a2a30ae3ec732f17a1d7a6a

Source

github

Perf win

Yes

Breaking

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project: gcc
subsystem: niter
patch_id: —
commit_hash: 19864661c96c457e4a2a30ae3ec732f17a1d7a6a
source_type: github
headline: Niter: Make MAX_DOMINATORS_TO_WALK configurable at runtime
tldr: The maximum number of dominators to walk in loop analysis can now be configured at runtime via a new `--param` option.
author: Michiel Derhaeg
outcome: committed
performance_win: true
breaking_change: false
series_id: —
series_parts: []
tags: • optimization
• loop analysis
• niter
• parameter
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/19864661c96c457e4a2a30ae3ec732f17a1d7a6a
date: 2026-04-29T00:00:00.000Z

The MAX_DOMINATORS_TO_WALK limit, used in loop analysis passes like the niter pass, can now be configured at runtime, using the --param=max-niter-dominators-walk option. This allows users to increase the limit for very large function bodies where the default value may be insufficient. The previously hardcoded value is removed.