Landing: 6da0b1468bfc

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Project / Subsystem

gcc / arc

Date

2026-09-17

Author

Michiel Derhaeg

Commit

6da0b1468bfc4fbf4e8029b9dd634c31cb8261d8

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: arc
patch_id: —
commit_hash: 6da0b1468bfc4fbf4e8029b9dd634c31cb8261d8
source_type: github
headline: arc: Don't advertise optab for unsupported vector modes [PR126243]
tldr: Prevents compiler ICEs by restricting vector operation advertising to supported modes.
author: Michiel Derhaeg
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • arc
• compiler
• bugfix
• vectorization
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/6da0b1468bfc4fbf4e8029b9dd634c31cb8261d8
date: 2026-09-17T00:00:00.000Z

This commit corrects the advertisement of vector operation optabs for the ARC architecture. Previously, operations like multiply and divide were advertised for V2SImode even when not supported by TARGET_PLUS_QMACW. This led to middle-end ICEs when operands degraded to DImode. The change restricts these optabs to be advertised only when TARGET_PLUS_QMACW is enabled, ensuring that vector modes are correctly supported.