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ErikPelli e1b62efaf3 encoding/base64: optimize decodemap memory set
The existing implementation has an execution time higher in the benchmark than this one.
This is an optimized implementation using the copy() function and a constant 256 bytes string with the values to be copied.

```
name           old time/op    new time/op    delta
NewEncoding-4     329ns ± 1%     231ns ± 1%  -29.72%  (p=0.008 n=5+5)

name           old speed      new speed      delta
NewEncoding-4   778MB/s ± 1%  1108MB/s ± 1%  +42.29%  (p=0.008 n=5+5)
```

Fixes #53211

Change-Id: I80fe62aa40623125ef81ae9164a8405eed30b71b
GitHub-Last-Rev: 55dce6f636
GitHub-Pull-Request: golang/go#53212
Reviewed-on: https://go-review.googlesource.com/c/go/+/410194
Reviewed-by: Keith Randall <khr@google.com>
Run-TryBot: Keith Randall <khr@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Keith Randall <khr@golang.org>
Auto-Submit: Keith Randall <khr@google.com>
Reviewed-by: Ian Lance Taylor <iant@google.com>
2022-08-17 03:15:44 +00:00
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