refactor: simd swar #112

Job	Run time
msrv	51s
Test with Miri	1m 39s
SIMD +sse4.2 on stable	1m 24s
SIMD +sse4.2 on stable	1m 21s
SIMD +avx2 on stable	1m 37s
SIMD +avx2 on stable	1m 24s
SIMD +sse4.2,+avx2 on stable	1m 29s
SIMD +sse4.2,+avx2 on stable	1m 24s
SIMD +sse4.2 on beta	59s
SIMD +sse4.2 on beta	44s
SIMD +avx2 on beta	44s
SIMD +avx2 on beta	45s
SIMD +sse4.2,+avx2 on beta	45s
SIMD +sse4.2,+avx2 on beta	57s
SIMD +sse4.2 on nightly	43s
SIMD +sse4.2 on nightly	44s
SIMD +avx2 on nightly	57s
SIMD +avx2 on nightly	1m 5s
SIMD +sse4.2,+avx2 on nightly	45s
SIMD +sse4.2,+avx2 on nightly	1m 1s
Test stable on ubuntu-latest	1m 31s
Test stable on windows-latest	2m 34s
Test stable on macOS-latest	2m 4s
Test beta on ubuntu-latest	47s
Test beta on windows-latest	1m 49s
Test beta on macOS-latest	1m 24s
Test nightly on ubuntu-latest	50s
Test nightly on windows-latest	2m 4s
Test nightly on macOS-latest	1m 30s
CI is green	0s
	35m 51s

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