Landing: 80b78b2504fb

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Project / Subsystem

gcc / aarch64

Date

2026-06-04

Author

Artemiy Volkov

Commit

80b78b2504fba037c4edf7172712210b323dcf32

Source

github

Perf win

No

Breaking

No

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All attributes

project: gcc
subsystem: aarch64
patch_id: —
commit_hash: 80b78b2504fba037c4edf7172712210b323dcf32
source_type: github
headline: Define duplication into sub-64-bit AdvSIMD vectors
tldr: GCC now supports duplicating elements into smaller Advanced SIMD vectors on AArch64, fixing an internal compiler error.
author: Artemiy Volkov
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • aarch64
• simd
• vectorization
• bugfix
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/80b78b2504fba037c4edf7172712210b323dcf32
date: 2026-06-04T00:00:00.000Z

This commit introduces new instruction patterns to the AArch64 backend, enabling the definition of duplication operations into sub-64-bit Advanced SIMD (AdvSIMD) vectors. This resolves an Internal Compiler Error (ICE) that occurred when attempting to generate vec_duplicate expressions for smaller vector types during vector initialization fallbacks. By explicitly defining these patterns, GCC can now correctly handle vector splat operations for 16-bit and 32-bit destinations, improving the robustness of vector code generation on AArch64.