Landing: 439cd07b5167

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Project / Subsystem

gcc / tree-optimization

Date

2026-09-02

Author

Richard Biener

Commit

439cd07b51676996889b1277afd46c1053d24ebc

Source

github

Perf win

No

Breaking

No

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All attributes

project: gcc
subsystem: tree-optimization
patch_id: —
commit_hash: 439cd07b51676996889b1277afd46c1053d24ebc
source_type: github
headline: ICE in vectorizable_lane_reducing fixed by handling analysis failure.
tldr: Fixes an internal compiler error by properly handling failures in vectorization analysis for lane-reducing operations.
author: Richard Biener
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • optimization
• vectorization
• ICE
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/439cd07b51676996889b1277afd46c1053d24ebc
date: 2026-09-02T00:00:00.000Z

This commit resolves an Internal Compiler Error (ICE) that occurred when analyzing lane-reducing reductions for vectorization. The issue arose because vect_get_num_copies_for_invariant would assert failure instead of returning an error code when it could not determine the number of copies. The analysis later relied on this information for costing, leading to the ICE. The fix ensures that the vectorizable_lane_reducing function fails early and gracefully when vect_get_num_copies_for_invariant encounters an issue, preventing the ICE and improving robustness for PR 127190.