Pratham Kumar 8dcbf62ef3 Merge pull request #30035 from pratham-mcw:invert_opt ...

add ARMPL HAL backend for cv::invert(DECOMP_LU) - #30035

## Summary

- Adds an ARM Performance Library (ArmPL) HAL backend for cv::invert under DECOMP_LU (cv_hal_LU32f / cv_hal_LU64f), replacing OpenCV's default LU decomposition path with ArmPL's LAPACKE_sgesv / LAPACKE_dgesv for float and double matrices on AArch64. 

## Changes
**hal/armpl/include/armpl_hal_core.hpp:**

- Declare armpl_hal_LU32f / armpl_hal_LU64f and register them as cv_hal_LU32f / cv_hal_LU64f.

hal/armpl/src/armpl_hal_core.cpp:

- Add armpl_lu() function (works for both float and double), that does the LU decomposition of the matrix:
  - If a right-hand side b is given, then LAPACKE_sgesv/dgesv is called.
  - If no right-hand side is given, it only factorizes the matrix using LAPACKE_sgetrf/dgetrf 

- Fall back to OpenCV's default (non-HAL) implementation for small matrices (m < 100).

## Performance Benchmarks
<img width="1001" height="105" alt="image" src="https://github.com/user-attachments/assets/ba18378c-24da-4d20-9819-3b4398cad6e2" />
<img width="1002" height="105" alt="image" src="https://github.com/user-attachments/assets/ff33d421-b95d-4fca-aad0-ab7bc035d49b" />
<img width="999" height="108" alt="image" src="https://github.com/user-attachments/assets/d4abb57e-6be0-4ea1-9894-d30074c9429c" />

2026-09-28 12:35:19 +03:00

..

armpl_hal_core.hpp

Merge pull request #30035 from pratham-mcw:invert_opt

2026-09-28 12:35:19 +03:00