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Added []byte->string optimization for switch and string comparisons

Ugorji Nwoke 2021-01-27 11:18:47 -05:00
parent 221e1dd1a1
commit cd947d9741
1 changed files with 24 additions and 1 deletions
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25
CompilerOptimizations.md

@ -27,9 +27,21 @@ For a map `m` of type `map[string]T` and `[]byte b`, `m[string(b)]` doesn't allo
* **gc:** 1.4+
* **gccgo:** ?
### `switch` on `[]byte`(s)
No allocation done on the `switch` line.
```go
var b []byte
switch string(b) {
case "AA":
// ...
}
```
### `range` over `[]byte`(s)
Avoiding allocating `[]byte` of a `string` when ranging over the bytes:
No allocation when converting a `string` into a `[]byte` for ranging over the bytes:
```go
s := "foo"
@ -38,6 +50,17 @@ for i, c := range []byte(s) {
}
```
### conversion for string comparison
No allocation done when converting a `[]byte` into a `string` for comparison purposes
```go
var b1 string
var b2 []byte
var x = string(b1) == string(b2) // memeq
var y = string(b1) < string(b2) // lexicographical comparison
```
* **gc:** 1.5+ (CL 3790)
* **gccgo:** ?