Simplify AVX512 code #824

Job	Run time
linux_clang (ubuntu-latest, Debug)	6m 5s
linux_clang_mpopcnt (ubuntu-latest, Debug)	5m 52s
linux_clang (ubuntu-latest, Release)	2m 48s
linux_128bit	10m 35s
linux_clang_mpopcnt (ubuntu-latest, Release)	2m 45s
linux_gcc (ubuntu-latest, Debug)	4m 32s
linux_gcc (ubuntu-latest, Release)	1m 15s
linux_gcc_mpopcnt (ubuntu-latest, Debug)	4m 29s
linux_gcc_sanitizers	3m 5s
linux_gcc_valgrind	1m 18s
linux_gcc_mpopcnt (ubuntu-latest, Release)	1m 17s
macos_clang (macos-latest, Debug)	2m 54s
windows_mingw64 (windows-latest, Debug)	9m 36s
macos_clang (macos-latest, Release)	1m 5s
windows_mingw64 (windows-latest, Release)	3m 39s
windows_msvc2022	2m 26s
windows_msvc2022_POPCNT	2m 24s
	1h 6m 5s

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