klion26 commented on PR #8041:
URL: https://github.com/apache/arrow-rs/pull/8041#issuecomment-3153348556
Added a benchmark for the `to_f64` function and made a benchmark on
different branches
1. The main branch (`i256_to_f64_base` in the result)
2. The current implementation(`8013_improve_performance_of_i256_to_f64` in
the benchamark result)
The result shows that the current implementation has improvements.
```
group
8013_improve_performance_of_i256_to_f64 i256_to_f64_base
-----
--------------------------------------- ----------------
......................... omitted the other benchmark results................
i256_to_f64(-1)
1.00 9.6±0.34ns ? ?/sec 1.15
11.0±0.36ns ? ?/sec
i256_to_f64(-1233456789)
1.00 9.3±0.20ns ? ?/sec 1.17
10.9±0.30ns ? ?/sec
i256_to_f64(-170141183460469231731687303715884105728)
1.00 9.7±0.32ns ? ?/sec 1.12
10.9±0.21ns ? ?/sec
i256_to_f64(-57896044618658097711785492504343953926634992332820282019728792003956564819968)
1.00 1.5±0.04ns ? ?/sec 1.85 2.7±0.13ns ?
?/sec
i256_to_f64(0)
1.00 1.9±0.06ns ? ?/sec 5.62
10.9±0.38ns ? ?/sec
i256_to_f64(1)
1.00 1.5±0.05ns ? ?/sec 7.38
10.8±0.41ns ? ?/sec
i256_to_f64(1233456789)
1.00 9.3±0.27ns ? ?/sec 1.17
10.9±0.33ns ? ?/sec
i256_to_f64(170141183460469231731687303715884105727)
1.00 9.7±0.43ns ? ?/sec 1.12
10.9±0.26ns ? ?/sec
i256_to_f64(57896044618658097711785492504343953926634992332820282019728792003956564819967)
1.00 10.4±0.27ns ? ?/sec 1.05 10.9±0.46ns ?
?/sec
```
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