Landing: 89f8552e424c

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Project / Subsystem

gcc / gcc/ipa

Date

2026-08-21

Author

Kugan Vivekanandarajah

Commit

89f8552e424c431cbd02f21f133a1c6c60a5c983

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: gcc/ipa
patch_id: —
commit_hash: 89f8552e424c431cbd02f21f133a1c6c60a5c983
source_type: github
headline: IPA: Apply computed profile scaling to call graphs
tldr: Fixes stale call graph edge counts after profile redistribution, preventing LTO ICEs.
author: Kugan Vivekanandarajah
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • optimization
• IPA
• LTO
• profile-guided
• compiler-error
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/89f8552e424c431cbd02f21f133a1c6c60a5c983
date: 2026-08-21T00:00:00.000Z

The Inter-procedural Analysis (IPA) pass failed to apply computed profile scaling factors to call graph edges. This resulted in stale counts after clone redistribution and verification failures, triggering an internal compiler error (ICE) during AutoFDO LTO compilation. This commit corrects cgraph_node::scale_profile_to to apply the computed scale, ensuring accurate profile data for subsequent optimization passes.