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TestImportExtremelyLargeImageWorks: optimize DevZero

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According to https://github.com/golang/go/issues/5373, go recognizes
(and optimizes for) the following syntax:

```go
for i := range b {
	b[i] = 0
}
```

so let's use it. Limited testing shows ~7.5x speed increase,
compared to the previously used syntax.

Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
This commit is contained in:
Kir Kolyshkin 2017-12-06 11:19:39 -08:00
parent 3676bd8569
commit f0cab0e285
1 changed files with 2 additions and 2 deletions
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4
internal/testutil/helpers.go
View file

@ -20,8 +20,8 @@ var DevZero io.Reader = devZero{}
type devZero struct{}
func (d devZero) Read(p []byte) (n int, err error) {
for i := 0; i < len(p); i++ {
p[i] = '\x00'
for i := range p {
p[i] = 0
}
return len(p), nil
}