huff0: Faster 1X Decompression

[klauspost]

Go 1.17 compiler is weird.

[orijbot]

Visit https://dashboard.github.orijtech.com?back=0&pr=435&remote=false&repo=klauspost%2Fcompress to see benchmark details.

[odeke-em]

You have some regressions, am not sure if you intended them or not https://dashboard.github.orijtech.com/benchmark/da0d1c1df2a54d3d8ffa6362d8cbc53e

We are working on making the bot an action so that it'll display the status for every commit and you can make required checks instead of manually inspecting always :-)

[klauspost]

@odeke-em All of these benchmarks are 100% unrelated. Most are compression benchmarks and this only changes decompression.

So I guess this gives an idea of the run-to-run variance. I am seeing the same locally with rather large compile-to-compile variance, especially after upgrading to Go 1.17. I know there isn't much you can do about that.

All of the CompressAllocations/EncodeAllDict65536_0/Encoder_EncodeAllHTML/WriterRandom/TwainEncode1e5/RandomEncodeBlock1MB/RandomEncodeBetterBlock16MB are in unrelated code, and it is of course sad that variance is >10% in some cases.

Only Decompress1X benchmarks should have changed.