Landing: 2508fac25d27

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Project / Subsystem

gcc / ipa-cp

Date

2026-05-21

Author

Martin Jambor

Commit

2508fac25d2722bf779c1e3e407a264c0a00312d

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: ipa-cp
patch_id: —
commit_hash: 2508fac25d2722bf779c1e3e407a264c0a00312d
source_type: github
headline: Adjusts IPA-CP cloning heuristics to reduce code size.
tldr: Adjusts interprocedural constant propagation (IPA-CP) cloning heuristics to reduce excessive code growth by increasing the cost/benefit threshold.
author: Martin Jambor
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • optimization
• ipa
• constant propagation
• code size
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/2508fac25d2722bf779c1e3e407a264c0a00312d
date: 2026-05-21T00:00:00.000Z

Interprocedural constant propagation (IPA-CP) was cloning too aggressively, leading to excessive code growth. This commit adjusts the cloning heuristics by raising the cost/benefit threshold (param_ipa_cp_eval_threshold) from 500 to 1100. It also reverts a change to get_max_overall_size that caused the size limit to depend on the current call-graph sweep, as this was counteracting the intended gradual reduction of the threshold.