tustvold commented on PR #1830:
URL: https://github.com/apache/arrow-rs/pull/1830#issuecomment-1152520577
On a Intel Cascade Lake Xeon(R) CPU @ 3.10GHz, specifically a GCP
c2-standard-16
### Nightly with defaults
```
buffer_bit_ops and time: [419.91 ns 420.01 ns 420.12 ns]
buffer_bit_ops or time: [550.34 ns 550.43 ns 550.54 ns]
```
### Nightly with simd
```
buffer_bit_ops and time: [252.84 ns 253.71 ns 254.75 ns]
buffer_bit_ops or time: [276.70 ns 276.77 ns 276.85 ns]
```
### Nightly with avx512
```
buffer_bit_ops and time: [338.87 ns 339.09 ns 339.37 ns]
buffer_bit_ops or time: [365.72 ns 365.78 ns 365.86 ns]
```
### Nightly with defaults and RUSTFLAGS="-Ctarget-cpu=native"
```
buffer_bit_ops and time: [177.27 ns 177.32 ns 177.38 ns]
buffer_bit_ops or time: [290.42 ns 290.47 ns 290.52 ns]
```
### Nightly with simd and RUSTFLAGS="-Ctarget-cpu=native"
```
buffer_bit_ops and time: [199.39 ns 199.42 ns 199.45 ns]
buffer_bit_ops or time: [227.88 ns 227.93 ns 227.98 ns]
```
### Nightly with avx512 and RUSTFLAGS="-Ctarget-cpu=native"
```
buffer_bit_ops and time: [199.58 ns 199.64 ns 199.73 ns]
buffer_bit_ops or time: [229.27 ns 229.30 ns 229.34 ns]
```
### Nightly with defaults and RUSTFLAGS="-Ctarget-cpu=native
-Ctarget-feature=-prefer-256-bit"
```
buffer_bit_ops and time: [166.14 ns 166.19 ns 166.26 ns]
buffer_bit_ops or time: [208.24 ns 208.30 ns 208.36 ns]
```
### Nightly with simd and RUSTFLAGS="-Ctarget-cpu=native
-Ctarget-feature=-prefer-256-bit"
```
buffer_bit_ops and time: [197.55 ns 197.58 ns 197.60 ns]
buffer_bit_ops or time: [223.72 ns 223.79 ns 223.86 ns]
```
### Nightly with avx512 and RUSTFLAGS="-Ctarget-cpu=native
-Ctarget-feature=-prefer-256-bit"
```
buffer_bit_ops and time: [200.34 ns 200.38 ns 200.41 ns]
buffer_bit_ops or time: [328.80 ns 328.84 ns 328.89 ns]
```
### Stable with defaults RUSTFLAGS="-Ctarget-cpu=native"
```
buffer_bit_ops and time: [178.72 ns 178.77 ns 178.82 ns]
buffer_bit_ops or time: [294.65 ns 294.69 ns 294.74 ns]
```
### Stable with defaults RUSTFLAGS="-Ctarget-cpu=native
-Ctarget-feature=-prefer-256-bit"
```
buffer_bit_ops and time: [176.34 ns 176.82 ns 177.45 ns]
buffer_bit_ops or time: [200.99 ns 201.08 ns 201.17 ns]
```
# Conclusion
* simd feature is always faster than avx512 feature
* With `target-cpu=native` the LLVM generated `buffer_bit_ops` is faster
than the simd version
* With `target-feature=-prefer-256-bit` the LLVM generated code is better
than either of the hand-rolled loops
* Performance between stable and nightly is very similar
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