`binary.AppendUvarint` offers better performance than using append
directly, because it avoids unnecessary memory allocation and copying.
In our case, it can increase the performance by +35.8% for the
`blockWriter.append` function:
```
benchmark old ns/op new ns/op delta
BenchmarkBlockWriterAppend-8 5.97 3.83 -35.80%
```
---------
Signed-off-by: jsvisa <delweng@gmail.com>
Co-authored-by: Gary Rong <garyrong0905@gmail.com>
The implementation of `parseIndexBlock` used a reverse loop with slice
appends to build the restart points, which was less cache-friendly and
involved unnecessary allocations and operations. In this PR we change
the implementation to read and validate the restart points in one single
forward loop.
Here is the benchmark test:
```bash
go test -benchmem -bench=BenchmarkParseIndexBlock ./triedb/pathdb/
```
The result as below:
```
benchmark old ns/op new ns/op delta
BenchmarkParseIndexBlock-8 52.9 37.5 -29.05%
```
about 29% improvements
---------
Signed-off-by: jsvisa <delweng@gmail.com>
