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Updated CompilerOptimizations (markdown)

Oliver Beattie 2015-03-24 14:09:51 +00:00
parent 0334a38050
commit a63d7cd561
1 changed files with 8 additions and 8 deletions
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16
CompilerOptimizations.md

@ -18,20 +18,20 @@ Putting a word-sized-or-less non-pointer type in an interface value doesn't allo
* **gc:** 1.0-1.3, but *not* in 1.4+
* **gccgo:** never
## string and []byte
## `string` and `[]byte`
### Map lookup by []byte
### Map lookup by `[]byte`
For a map m of type map[string]T and []byte b, m[string(b)] doesn't allocate. (the temporary string copy of the byte slice isn't made)
For a map `m` of type `map[string]T` and `[]byte b`, `m[string(b)]` doesn't allocate. (the temporary string copy of the byte slice isn't made)
* **gc:** 1.4+
* **gccgo:** ?
### range over []byte(s)
### `range` over `[]byte`(s)
Avoiding allocating []byte of a string when ranging over the bytes:
Avoiding allocating `[]byte` of a `string` when ranging over the bytes:
```
```go
s := "foo"
for i, c := range []byte(s) {
// ...
@ -57,7 +57,7 @@ Gc compiler does global escape analysis across function and package boundaries.
### Function Inlining
Only short and simple functions are inlined. To be inlined a function must contain less than ~40 expressions and does not contain complex things like function calls, loops, labels, closures, panic's, recover's, select's, switch'es, etc.
Only short and simple functions are inlined. To be inlined a function must contain less than ~40 expressions and does not contain complex things like function calls, loops, labels, closures, `panic`'s, `recover`'s, `select`'s, `switch`'es, etc.
* **gc:** 1.0+
* **gccgo:** -O1 and above.
@ -74,7 +74,7 @@ for i := range s {
}
```
are converted into efficient runtime memclr calls. [Issue](golang.org/issue/5373) and [commit](https://golang.org/change/f03c9202c43e0abb130669852082117ca50aa9b1).
are converted into efficient runtime memclr calls. [Issue](https://github.com/golang/go/issues/5373) and [commit](https://golang.org/change/f03c9202c43e0abb130669852082117ca50aa9b1).
* **gc:** 1.5+
* **gccgo:** ?