Landing: 5fa2866f2674

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Project / Subsystem

gcc / tree-optimization

Date

2026-08-28

Author

Richard Biener

Commit

5fa2866f2674d274034de150f669aee611c2d9fe

Source

github

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Breaking

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All attributes

project: gcc
subsystem: tree-optimization
patch_id: —
commit_hash: 5fa2866f2674d274034de150f669aee611c2d9fe
source_type: github
headline: Fix ICE with empty reduction in vectorization analysis
tldr: Corrects a bug in vectorization analysis that caused an ICE when encountering empty reduction chains.
author: Richard Biener
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • optimization
• vectorization
• compiler bug
• pr127105
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/5fa2866f2674d274034de150f669aee611c2d9fe
date: 2026-08-28T00:00:00.000Z

This commit resolves an internal compiler error (ICE) in the vectorization analysis pass (vect_analyze_slp_reduc_chain). The bug occurred when the analysis attempted to access a non-existent statement after verifying its existence. The fix ensures that the statement is accessed only after its presence is confirmed, preventing the ICE and adding a new test case for this scenario.