Restore old compression functions to preserve ABI #101

Job	Run time
CI ubuntu-latest baseline clang release	3m 7s
CI ubuntu-latest baseline clang debug	3m 35s
CI ubuntu-latest avx clang release	3m 1s
CI ubuntu-latest avx clang debug	3m 24s
CI ubuntu-latest avx2 clang release	3m 13s
CI ubuntu-latest avx2 clang debug	3m 24s
CI macos-latest baseline clang release	2m 47s
CI macos-latest baseline clang debug	2m 56s
CI macos-latest avx clang release	2m 48s
CI macos-latest avx clang debug	2m 51s
CI ubuntu-latest baseline gcc release	3m 20s
CI ubuntu-latest baseline gcc debug	3m 1s
CI ubuntu-latest avx gcc release	3m 0s
CI ubuntu-latest avx gcc debug	2m 53s
CI ubuntu-latest avx2 gcc release	3m 4s
CI ubuntu-latest avx2 gcc debug	2m 48s
CI windows-latest baseline msvc release	5m 54s
CI windows-latest baseline msvc debug	4m 21s
CI windows-latest avx msvc release	4m 44s
CI windows-latest avx msvc debug	4m 8s
CI windows-latest avx2 msvc release	4m 57s
CI windows-latest avx2 msvc debug	4m 4s
	1h 17m 20s

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