release/1.1.6

What's Changed

• Fix nullable attributes leaking as public by @brantburnett in #94

Full Changelog: release/1.1.5...release/1.1.6

release/1.1.5

What's Changed

• Update README.md - Correcting wrong descriptions by @mjebrahimi in #91
• Switch NuGet to use a license expression to assist with SBOM analysis by @brantburnett in #93

New Contributors

• @mjebrahimi made their first contribution in #91

Full Changelog: release/1.1.4...release/1.1.5

release/1.1.4

This release primarily includes performance improvements around stream decompression in .NET 8, but does show some minor decompression improvements on other runtimes (except .NET 4.8 which is not a priority). Also includes a bug fix for a stream decompression corner case.

What's Changed

• Eliminate most CharTable range checks by @brantburnett in #81
• Apply various code analysis improvements by @brantburnett in #82
• Handle null chunk type using enum value by @brantburnett in #83
• Improve .NET 8 stream decompression perf by @brantburnett in #84
• Refactor DecompressAllTags to reduce duplicate code by @brantburnett in #85
• Use an inline array for decompression scratch by @brantburnett in #86
• Fix stream decompression corner case failure by @brantburnett in #89
• Don't pass around references to the scrach buffer by @brantburnett in #90

Decompression Benchmarks

BenchmarkDotNet v0.13.10, Windows 11 (10.0.22621.3007/22H2/2022Update/SunValley2)
12th Gen Intel Core i7-1270P, 1 CPU, 16 logical and 12 physical cores
.NET SDK 8.0.101

Method	Runtime	Build	PGO	Mean	Error	StdDev	Ratio	RatioSD	Rank
BlockDecompress	.NET Framework 4.8	Previous	N	14.55 us	0.089 us	0.079 us	1.00	0.00	1
BlockDecompress	.NET Framework 4.8	Default	N	15.78 us	0.189 us	0.158 us	1.08	0.01	2
BlockDecompress	.NET 6.0	Previous	N	12.99 us	0.151 us	0.134 us	1.00	0.00	2
BlockDecompress	.NET 6.0	Default	N	12.75 us	0.181 us	0.170 us	0.98	0.02	1
BlockDecompress	.NET 8.0	Previous	N	10.57 us	0.208 us	0.214 us	1.00	0.00	2
BlockDecompress	.NET 8.0	Default	N	10.30 us	0.163 us	0.152 us	0.97	0.02	1
BlockDecompress	.NET 8.0	Previous	Y	10.51 us	0.198 us	0.194 us	1.00	0.00	2
BlockDecompress	.NET 8.0	Default	Y	10.15 us	0.173 us	0.162 us	0.97	0.02	1

Method	Runtime	Build	PGO	Mean	Error	StdDev	Ratio	RatioSD	Rank
StreamDecompress	.NET Framework 4.8	Previous	N	337.3 us	6.35 us	5.94 us	1.00	0.00	1
StreamDecompress	.NET Framework 4.8	Default	N	332.4 us	5.09 us	4.51 us	0.99	0.02	1
StreamDecompress	.NET 6.0	Previous	N	164.9 us	2.57 us	2.40 us	1.00	0.00	2
StreamDecompress	.NET 6.0	Default	N	161.2 us	3.21 us	3.29 us	0.98	0.02	1
StreamDecompress	.NET 8.0	Previous	N	194.4 us	2.16 us	2.02 us	1.00	0.00	2
StreamDecompress	.NET 8.0	Default	N	189.6 us	2.59 us	2.42 us	0.98	0.02	1
StreamDecompress	.NET 8.0	Previous	Y	201.7 us	4.01 us	4.45 us	1.00	0.00	2
StreamDecompress	.NET 8.0	Default	Y	176.6 us	3.49 us	3.43 us	0.87	0.03	1

Full Changelog: release/1.1.3...release/1.1.4

release/1.1.3

What's Changed

• Update to target .NET 8 by @brantburnett in #80

Full Changelog: release/1.1.2...release/1.1.3

1.1.2

What's Changed

• Update COPYING.txt by @brantburnett in #74
• Rework test reporter for public PRs by @brantburnett in #78
• Fix test reporter typo by @brantburnett in #79
• check table size greater than by @ak88 in #77

New Contributors

• @ak88 made their first contribution in #77

Full Changelog: release/1.1.1...release/1.1.2

1.1.1

This release includes some fixes to logic that could have caused unsafe memory access in cases where GC rearranges memory if they occurred at the precise moment when an out-of-range reference was on the stack. These moments are very short-lived and should be impossible to create intentionally, but they still represent a security risk.

What's Changed

• Allow ref byte to point just past the end of spans by @brantburnett in #73

Full Changelog: release/1.1.0...release/1.1.1

1.1.0

Breaking Changes

This release no longer includes explicit support for the unsupported runtimes .NET Core 3.0/3.1 or .NET 5.0. These runtimes are now supported via the .NET Standard 2.0 target. While they should still function, it is untested and the lack of hardware intrinsic support will most likely result in degraded performance compared to 1.0.

What's Changed

• All use of GC pinning and fixed buffers has been replaced with byte references and System.Runtime.CompilerServices.Unsafe. This should have less impact on garbage collection performance, especially on systems with continuous Snappy load.
• Reduced heap allocations
• Ported some performance improvements from the reference implementation that were added since the original port
• Lots more performance tweaks

Performance

This release sees a consistent improvement in both compression and decompression performance across all supported frameworks on my Core i7-10850H CPU, especially on decompression. On .NET 6, the time was reduced by 18% when compressing 64KB of HTML and 52% when decompressing. In some cases, the decompression time is reduced by as much as 66%.

Changelog

• Add .NET 6.0 target by @brantburnett in #40
• Update CodeQL to use .NET 6 by @brantburnett in #41
• Remove support for unsupported runtimes by @brantburnett in #42
• Rename GitHub actions and run on release branches by @brantburnett in #43
• Preload Pshufb fill pattern Vector128 by @brantburnett in #44
• Make unit tests .NET 4.8 compatible by @brantburnett in #45
• Switch CopyHelpers to use ref byte instead of byte* by @brantburnett in #46
• Improve perf of UnalignedCopy64/128 by @brantburnett in #47
• Rewrite decompressor AppendXXX methods to use refs by @brantburnett in #48
• Rewrite decompressor RefillTagFromScatch method to use refs by @brantburnett in #49
• Switch decompression input and scratch to use ref byte by @brantburnett in #50
• Switch decompression buffer and op to use ref byte by @brantburnett in #51
• Move steps to decompress from scratch to a separate method by @brantburnett in #52
• Switch compression hash table from pinned ptr to ref by @brantburnett in #53
• Reduce compression heap and buffer overhead by @brantburnett in #54
• Use ref byte for compression output pointer by @brantburnett in #55
• Use ref byte for compression input pointers by @brantburnett in #56
• Switch stream decompression from pointers to spans by @brantburnett in #57
• Use ThrowHelper for all exceptions by @brantburnett in #58
• Cleanup benchmarks by @brantburnett in #59
• Allow shorter compression output buffer lengths by @brantburnett in #60
• Improve benchmark summaries by @brantburnett in #61
• Fix compression stream benchmarks by @brantburnett in #62
• Improve block benchmarks by @brantburnett in #63
• Improve speed of hash table clear by @brantburnett in #64
• Simplify PSHUFB copy logic for .NET 6/7 by @brantburnett in #65
• Use CRC32 hash when available during compression by @brantburnett in #66
• Remove some unnecessary unsafe blocks by @brantburnett in #67
• Use ArrayPool instead of MemoryPool for the lookback buffer by @brantburnett in #68
• Improve Log2Floor for legacy runtimes by @brantburnett in #69
• Optimize FindMatchLength for x64 by @brantburnett in #70
• Simplify stream decompress logic by @brantburnett in #71
• Switch several arrays to static data references by @brantburnett in #72

Full Changelog: release/1.0.0...release/1.1.0

Initial release

Note that this release is focused on performance on Intel/AMD x64 processes on .NET Core 3.1 or .NET 5. It uses Intel intrinsics extensively, so performance will be slower on other CPU architectures or runtimes.

1.0.0 Beta 2

Various bug fixes found during beta

1.0.0 Beta 1

release/1.0.0-beta001

Correct working directory for publish (#22)