Legacy removing

[ermig1979]

Simd is being developing about 12 years.
And some of its components are not actual now.
I think that I can remove some of functionality that are not updated for many years.
This list is not full and may be updated:

1. Support of PPC architecture.
2. Data tests (they were developed for PPC porting).
3. AVX-512F optimizations (merge them to AVX-512BW optimizations).
4. SSE2 optimizations (merge them to SSE4.1 optimizations).
5. AVX optimizations (merge them to AVX2 optimizations).
6. EdgeBackground functions.
7. SvmSumLinear function.
8. Interference functions.
9. SimdTensorFormatType - remove all types besides NHWC and NCHW.
10. SimdSynetReorderImage and SimdSynetReorderFilter functions.
11. SimdSynetSpecifyTensorFormat and SimdSynetTensorAlignment functions.
12. SynetAddBias - remove support of all formats besides NHWC and NCHW.
13. SynetScaleLayerForward - remove support of all formats besides NHWC and NCHW.
14. SynetPreluLayerForward - remove support of all formats besides NHWC and NCHW.
15. SynetFusedLayerForward(0-9) - remove support of all formats besides NHWC and NCHW.
16. SimdYuv444pToBgr, SimdYuv422pToBgr, SimdYuv420pToBgr.
17. SimdYuv444pToBgra, SimdYuv422pToBgra, SimdYuv420pToBgra

[mikeversteeg]

I have no problems with this. Another way of cleaning up is to remove YUV420P functions if there is a similar YUV422P version.

[ermig1979]

I want to note that YUV420P is not the same as YUV422P.

[mikeversteeg]

Can't you convert 422 to 420 by doubling the U & V stride?

[mikeversteeg]

Oh no, that's to make a 420 from a 422. What we need here is to tell stride to increment at half speed. The rest of the code can remain the same. I'd definitely want 422 supported.