Landing: 7276d80fedab

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Project / Subsystem

gcc / amdgcn

Date

2026-01-30

Author

Andrew Stubbs

Commit

7276d80fedab2d824bb0fcd0d7eca2b9138d963f

Source

github

Perf win

Breaking

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All attributes

project: gcc
subsystem: amdgcn
patch_id: —
commit_hash: 7276d80fedab2d824bb0fcd0d7eca2b9138d963f
source_type: github
headline: amdgcn: Add vector count leading zeros/ones instructions
tldr: Vector versions of count leading zeros/ones instructions are now available for AMD GPUs.
author: Andrew Stubbs
outcome: committed
performance_win: false
breaking_change: false
series_id: —
series_parts: []
tags: • amd
• gpu
• bit manipulation
• instruction selection
discussion_id_link: —
bugzilla_pr: —
url: https://github.com/gcc-mirror/gcc/commit/7276d80fedab2d824bb0fcd0d7eca2b9138d963f
date: 2026-01-30T00:00:00.000Z

This commit adds vector counterparts for the scalar count leading zeros (ctz) and count leading ones (clz) instructions on AMD GPUs. Previously, only scalar versions were available. This enhancement provides more complete bit manipulation capabilities for vector data types on the AMDGPU architecture.