Explain the DAA instruction algorithm #4023

Job	Run time
macos-static	2m 22s
unix (ubuntu-20.04, g++, make)	5m 20s
unix (ubuntu-20.04, g++, cmake)	6m 4s
windows (32, windows-2019)	6m 17s
windows-mingw-build (32)	56s
windows (32, windows-2022)	4m 24s
windows-mingw-build (64)	1m 16s
unix (ubuntu-20.04, clang++, make)	5m 59s
windows (64, windows-2019)	4m 44s
unix (ubuntu-20.04, clang++, cmake)	5m 51s
windows (64, windows-2022)	4m 57s
unix (ubuntu-22.04, g++, make)	5m 44s
unix (ubuntu-22.04, g++, cmake)	5m 57s
unix (ubuntu-22.04, clang++, make)	3m 59s
unix (ubuntu-22.04, clang++, cmake)	3m 59s
unix (macos-14, clang++, make)	6m 10s
unix (macos-14, clang++, cmake)	5m 46s
windows-mingw-testing (windows-2019, 32)	4m 26s
windows-mingw-testing (windows-2019, 64)	4m 26s
windows-mingw-testing (windows-2022, 32)	3m 37s
windows-mingw-testing (windows-2022, 64)	4m 47s
	1h 37m 1s

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