Landing: 4024e780b148

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Project / Subsystem

gcc / amdgcn

Date

2026-09-21

Author

Andrew Stubbs

Commit

4024e780b14853d614dfd9ed002b04fc88cb75f9

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: amdgcn
patch_id: —
commit_hash: 4024e780b14853d614dfd9ed002b04fc88cb75f9
source_type: github
headline: Fix vector popcount instruction for AMD GCN targets
tldr: Corrects the vector version of the popcount instruction on AMD GCN architectures.
author: Andrew Stubbs
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • amdgcn
• gpu
• optimization
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/4024e780b14853d614dfd9ed002b04fc88cb75f9
date: 2026-09-21T00:00:00.000Z

A bug in the vector version of the population count (popcount) instruction for AMD GCN targets has been fixed. The v_bcnt instruction was missing its third parameter, which is present in the scalar version. This commit adds the necessary parameter, ensuring correct execution of vector popcount operations.