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Is there theoretical document for SVGENDQ_MACRO of version 4?

Other Parts Discussed in Thread: CONTROLSUITE

Hi 

I use controlsuite.

In version 4 or later, The SVGENDQ_MACRO code is shown below.

Compared to version 3, the code is simple

But, no documents with theoretical explanations.

I can't understand why these code is used.

Under version 3, I understand code what the document describes.

Is there theoretical document for SVGENDQ_MACRO of version 4?

If not, please explain below code.

Additionally, codes are different, but are the Ta, Tb, and Tc values ​​the same?