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perf: higher performance unsafeStringToSlice #371

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perf: higher performance unsafeStringToSlice #371

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6fb6693
Higher performance UnsafeStringToSlice
dxasu Nov 22, 2024
7e5474c
remove unused import reflect
dxasu Nov 25, 2024
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15 changes: 7 additions & 8 deletions nocopy.go
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Original file line number Diff line number Diff line change
Expand Up @@ -16,7 +16,6 @@ package netpoll

import (
"io"
"reflect"
"unsafe"

"github.com/bytedance/gopkg/lang/dirtmake"
Expand Down Expand Up @@ -276,13 +275,13 @@ func unsafeSliceToString(b []byte) string {
}

// zero-copy slice convert to string
func unsafeStringToSlice(s string) (b []byte) {
p := unsafe.Pointer((*reflect.StringHeader)(unsafe.Pointer(&s)).Data)
hdr := (*reflect.SliceHeader)(unsafe.Pointer(&b))
hdr.Data = uintptr(p)
hdr.Cap = len(s)
hdr.Len = len(s)
return b
func unsafeStringToSlice(s string) []byte {
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@dxasu you should remove "reflect" import path also

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done

return *(*[]byte)(unsafe.Pointer(
&struct {
string
int
}{s, len(s)},
))
}

// malloc limits the cap of the buffer from mcache.
Expand Down
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