Files
oak-gpui/crates
Adam Richardson 370d4ce200 rope: Micro optimize the creation of masks (#41132)
Using compiler explorer I saw that the compiler wasn't clever enough to
optimise away the branches in the masking code. I thought the compiler
would have a better chance if we always branched, which [turned out to
be the case](https://godbolt.org/z/PM594Pz18).

Running the benchmarks the biggest benefit I saw was:
```
push/65536              time:   [2.9067 ms 2.9243 ms 2.9417 ms]
                        thrpt:  [21.246 MiB/s 21.373 MiB/s 21.502 MiB/s]
                 change:
                        time:   [-8.3452% -7.2617% -6.2009%] (p = 0.00 < 0.05)
                        thrpt:  [+6.6108% +7.8303% +9.1050%]
                        Performance has improved.
```
But I did also see some regressions:
```
slice/4096              time:   [66.195 µs 66.815 µs 67.448 µs]
                        thrpt:  [57.915 MiB/s 58.464 MiB/s 59.012 MiB/s]
                 change:
                        time:   [+3.7131% +5.1698% +6.6971%] (p = 0.00 < 0.05)
                        thrpt:  [-6.2768% -4.9157% -3.5802%]
                        Performance has regressed.
```

Release Notes:

- N/A
2025-10-27 16:16:16 +01:00
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