---
id: pr-cccl-cub-5371
repo: NVIDIA/cccl
pr: 5371
title: Complex sqrt accuracy/speed improvements
author: s-oboyle
date: '2025-08-18'
url: https://github.com/NVIDIA/cccl/pull/5371
source_category: upstream-code
architectures:
- sm100
tags:
- fp4
techniques: []
hardware_features:
- fp4
kernel_types: []
languages: []
captured_at: '2026-05-16'
status: merged
merge_sha: a2a9c0b11bb4a894241eb01253490fd723804c03
inclusion_reason: Search-matched CUDA kernel optimization PR; materialize diff/source before synthesis.
changed_paths:
- libcudacxx/include/cuda/std/__complex/roots.h
artifact_dir: evidence/pull-bundles/cccl-cub/gh-5371
head_ref_oid: 73f90d2b1a86e5e6357e71c7ad01b4151a0f24e5
---
# Complex sqrt accuracy/speed improvements

- Repository: `NVIDIA/cccl`
- PR: [5371](https://github.com/NVIDIA/cccl/pull/5371)
- 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

- `libcudacxx/include/cuda/std/__complex/roots.h`

## Evidence Bundle

`evidence/pull-bundles/cccl-cub/gh-5371`
