Benchmarks

[htot]

I did some automated benchmarking on my i7-10700 and Edison (Merrifield dual core Silvermont Atom without cache memory, similar to Baytrail) that I want to share here. Strictly, this issue is for reference only. It might be useful to find those commits causing substantial performance increases or decreases. All data have been taken without OpenMP (1 thread only) and in x86_64 mode. On i7 you will see some deviation probably caused by frequency scaling / turbo boost. Don't let that disturb you. Data can be found here if you want to play yourself benchmarks.ods

Below I filter out the most interesting commits.

Encoding

Note that on Edison SSE3 encoding took a hit with 9a0d1b2.

#	Hash	Commit message
24	3f3f31c	Fix build under Xcode
30	67ee3fd	SSSE3->AVX2 encoding optimization
76	a5b6739	SSSE3: enc: factor encoding loop into inline function
79	99977db	Generic64: enc: factor encoding loop into inline function
92	e2c6687	AVX2: enc: unroll inner loop
93	9a0d1b2	SSSE3: enc: unroll inner loop
96	bf7341f	Generic64: enc: unroll inner loop
114	b8b3c58	Generic64: enc: use 12-bit lookup table

Decoding

Especially for Edison it has been a bumpy ride, with great improvements 3f3f31c and regressions 0a69845 on SSE3 but also for PLAIN cfa8bf7 and f538baa.

#	Hash	Commit message
24	3f3f31c	Fix build under Xcode
29	cfa8bf7	Plain decoding optimization
35	0a69845	SSSE3->AVX2, NEON32 decoding optimization
85	6310c1f	SSSE3: dec: factor decoding loop into inline function
88	f538baa	Generic32: dec: factor decoding loop into inline function
100	495414b	AVX2: dec: unroll inner loop
101	5874921	SSSE3: dec: unroll inner loop