Landing: fcecd85661f9

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Project / Subsystem

gcc / i386

Date

2026-09-21

Author

Jakub Jelinek

Commit

fcecd85661f9947d09dd752124279fc537021106

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: i386
patch_id: —
commit_hash: fcecd85661f9947d09dd752124279fc537021106
source_type: github
headline: Only support GFNI V32QImode rotates with AVX2, not just AVX
tldr: GFNI rotates on V32QImode now correctly require AVX2, preventing ICEs.
author: Jakub Jelinek
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • i386
• avx2
• gfni
• compiler error
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/fcecd85661f9947d09dd752124279fc537021106
date: 2026-09-21T00:00:00.000Z

This commit corrects the CPU feature requirements for GFNI V32QImode rotates. Previously, these operations were incorrectly enabled with just AVX, leading to compiler internal errors (ICEs) because AVX alone does not support the necessary V32QImode shifts. The change mandates AVX2, aligning with the actual hardware capabilities and resolving PR127498.