README
2025 revival
For IEEE checksums AVX512 can be used to speed up CRC32 checksums by approximately 2x.
Castagnoli checksums (CRC32C) can also be computer with AVX512, but the performance gain is not as significant enough for the downsides of using it at this point.
crc32
This package is a drop-in replacement for the standard library hash/crc32 package,
that features AVX 512 optimizations on x64 platforms, for a 2x speedup for IEEE CRC32 checksums.
usage
Install using go get github.com/klauspost/crc32. This library is based on Go 1.24
Replace import "hash/crc32" with import "github.com/klauspost/crc32" and you are good to go.
changes
- 2025: Revived and updated to Go 1.24, with AVX 512 optimizations.
performance
AVX512 are enabled above 1KB input size. This rather high limit is due to AVX512 may be slower to ramp up than the regular SSE4 implementation for smaller inputs. This is not reflected in the benchmarks below.
| Benchmark | Old MB/s | New MB/s | Speedup |
|---|---|---|---|
| BenchmarkCRC32/poly=IEEE/size=512/align=0-32 | 17996.39 | 17969.94 | 1.00x |
| BenchmarkCRC32/poly=IEEE/size=512/align=1-32 | 18021.48 | 17945.55 | 1.00x |
| BenchmarkCRC32/poly=IEEE/size=1kB/align=0-32 | 19921.70 | 45613.77 | 2.29x |
| BenchmarkCRC32/poly=IEEE/size=1kB/align=1-32 | 19946.60 | 46819.09 | 2.35x |
| BenchmarkCRC32/poly=IEEE/size=4kB/align=0-32 | 21538.65 | 48600.93 | 2.26x |
| BenchmarkCRC32/poly=IEEE/size=4kB/align=1-32 | 21449.20 | 48477.84 | 2.26x |
| BenchmarkCRC32/poly=IEEE/size=32kB/align=0-32 | 21785.49 | 46013.10 | 2.11x |
| BenchmarkCRC32/poly=IEEE/size=32kB/align=1-32 | 21946.47 | 45954.10 | 2.09x |
cpu: AMD Ryzen 9 9950X 16-Core Processor
license
Standard Go license. See LICENSE for details.
Contributors
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Assembly
77.1%
Go
22.9%
README
2025 revival
For IEEE checksums AVX512 can be used to speed up CRC32 checksums by approximately 2x.
Castagnoli checksums (CRC32C) can also be computer with AVX512, but the performance gain is not as significant enough for the downsides of using it at this point.
crc32
This package is a drop-in replacement for the standard library hash/crc32 package,
that features AVX 512 optimizations on x64 platforms, for a 2x speedup for IEEE CRC32 checksums.
usage
Install using go get github.com/klauspost/crc32. This library is based on Go 1.24
Replace import "hash/crc32" with import "github.com/klauspost/crc32" and you are good to go.
changes
- 2025: Revived and updated to Go 1.24, with AVX 512 optimizations.
performance
AVX512 are enabled above 1KB input size. This rather high limit is due to AVX512 may be slower to ramp up than the regular SSE4 implementation for smaller inputs. This is not reflected in the benchmarks below.
| Benchmark | Old MB/s | New MB/s | Speedup |
|---|---|---|---|
| BenchmarkCRC32/poly=IEEE/size=512/align=0-32 | 17996.39 | 17969.94 | 1.00x |
| BenchmarkCRC32/poly=IEEE/size=512/align=1-32 | 18021.48 | 17945.55 | 1.00x |
| BenchmarkCRC32/poly=IEEE/size=1kB/align=0-32 | 19921.70 | 45613.77 | 2.29x |
| BenchmarkCRC32/poly=IEEE/size=1kB/align=1-32 | 19946.60 | 46819.09 | 2.35x |
| BenchmarkCRC32/poly=IEEE/size=4kB/align=0-32 | 21538.65 | 48600.93 | 2.26x |
| BenchmarkCRC32/poly=IEEE/size=4kB/align=1-32 | 21449.20 | 48477.84 | 2.26x |
| BenchmarkCRC32/poly=IEEE/size=32kB/align=0-32 | 21785.49 | 46013.10 | 2.11x |
| BenchmarkCRC32/poly=IEEE/size=32kB/align=1-32 | 21946.47 | 45954.10 | 2.09x |
cpu: AMD Ryzen 9 9950X 16-Core Processor
license
Standard Go license. See LICENSE for details.
Similar repos
Contributors
Languages
Assembly
77.1%
Go
22.9%