---
id: pr-cccl-cub-8755
repo: NVIDIA/cccl
pr: 8755
title: '[cudax] Change the group mapping application logic'
author: davebayer
date: '2026-05-04'
url: https://github.com/NVIDIA/cccl/pull/8755
source_category: upstream-code
architectures:
- sm100
tags:
- warp
techniques:
- warp-specialization
hardware_features: []
kernel_types: []
languages:
- cuda-cpp
captured_at: '2026-05-16'
status: merged
merge_sha: 82221ad10342af1afa3eeb3ce910f53cc4f7faaa
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- cudax/include/cuda/experimental/__group/fwd.cuh
- cudax/include/cuda/experimental/__group/group.cuh
- cudax/include/cuda/experimental/__group/mapping/group_as.cuh
- cudax/include/cuda/experimental/__group/mapping/group_by.cuh
- cudax/include/cuda/experimental/__group/mapping/mapping_result.cuh
- cudax/test/common/group_testing.cuh
- cudax/test/group/mapping/group_as.cu
- cudax/test/group/mapping/group_by.cu
- cudax/test/group/synchronizer/barrier_synchronizer.cu
- cudax/test/group/synchronizer/lane_synchronizer.cu
artifact_dir: evidence/pull-bundles/cccl-cub/gh-8755
head_ref_oid: a190751d6322fc507be2016d52014e6b61c6b1ee
---
# [cudax] Change the group mapping application logic

- Repository: `NVIDIA/cccl`
- PR: [8755](https://github.com/NVIDIA/cccl/pull/8755)
- Decision: `Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.`
- Reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.

## Changed Paths

- `cudax/include/cuda/experimental/__group/fwd.cuh`
- `cudax/include/cuda/experimental/__group/group.cuh`
- `cudax/include/cuda/experimental/__group/mapping/group_as.cuh`
- `cudax/include/cuda/experimental/__group/mapping/group_by.cuh`
- `cudax/include/cuda/experimental/__group/mapping/mapping_result.cuh`
- `cudax/test/common/group_testing.cuh`
- `cudax/test/group/mapping/group_as.cu`
- `cudax/test/group/mapping/group_by.cu`
- `cudax/test/group/synchronizer/barrier_synchronizer.cu`
- `cudax/test/group/synchronizer/lane_synchronizer.cu`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-8755`
