Landing: 5dde4aa27ecf

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Project / Subsystem

gcc / tree-optimization

Date

2026-09-03

Author

Richard Biener

Commit

5dde4aa27ecfefcebc0a0d7dfbf336e321ec6ea1

Source

github

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Breaking

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All attributes

project: gcc
subsystem: tree-optimization
patch_id: —
commit_hash: 5dde4aa27ecfefcebc0a0d7dfbf336e321ec6ea1
source_type: github
headline: tree-optimization/127195 - Fix ICE with vect_create_constant_vectors
tldr: Fixes an ICE in vectorization when creating constant vectors with excess lanes.
author: Richard Biener
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • bugfix
• vectorization
• optimization
• compiler-error
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/5dde4aa27ecfefcebc0a0d7dfbf336e321ec6ea1
date: 2026-09-03T00:00:00.000Z

An Internal Compiler Error (ICE) in GCC’s vectorization pass, specifically within vect_create_constant_vectors, has been resolved. The bug occurred when code had excess vector lanes, causing an incorrect count of element copies. This led to ctor_seq statements not being emitted properly. The fix corrects the calculation of the number of copies and ensures the operation aligns with vector boundaries.