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Labels: further optimisation for dedupelabels

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Inline (by copy-paste) the fast path of `decodeVarint` in various
places where it gets called a lot.

Signed-off-by: Bryan Boreham <bjboreham@gmail.com>
This commit is contained in:
Bryan Boreham 2024-06-05 18:54:13 +01:00
parent 2ced2f6aec
commit 2ba7bc9446
1 changed files with 21 additions and 4 deletions
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25
model/labels/labels_dedupelabels.go
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@ -113,7 +113,10 @@ func decodeVarint(data string, index int) (int, int) {
if b < 0x8000 { if b < 0x8000 {
return b, index return b, index
} }
return decodeVarintRest(b, data, index)
}
func decodeVarintRest(b int, data string, index int) (int, int) {
value := int(b & 0x7FFF) value := int(b & 0x7FFF)
b = int(data[index]) b = int(data[index])
index++ index++
@ -128,8 +131,12 @@ func decodeVarint(data string, index int) (int, int) {
} }
func decodeString(t *nameTable, data string, index int) (string, int) { func decodeString(t *nameTable, data string, index int) (string, int) {
var num int // Copy decodeVarint here, because the Go compiler says it's too big to inline.
num, index = decodeVarint(data, index) num := int(data[index]) + int(data[index+1])<<8
index += 2
if num >= 0x8000 {
num, index = decodeVarintRest(num, data, index)
}
return t.ToName(num), index return t.ToName(num), index
} }
@ -323,7 +330,12 @@ func (ls Labels) Get(name string) string {
} else if lName[0] > name[0] { // Stop looking if we've gone past. } else if lName[0] > name[0] { // Stop looking if we've gone past.
break break
} }
_, i = decodeVarint(ls.data, i) // Copy decodeVarint here, because the Go compiler says it's too big to inline.
num := int(ls.data[i]) + int(ls.data[i+1])<<8
i += 2
if num >= 0x8000 {
_, i = decodeVarintRest(num, ls.data, i)
}
} }
return "" return ""
} }
@ -341,7 +353,12 @@ func (ls Labels) Has(name string) bool {
} else if lName[0] > name[0] { // Stop looking if we've gone past. } else if lName[0] > name[0] { // Stop looking if we've gone past.
break break
} }
_, i = decodeVarint(ls.data, i) // Copy decodeVarint here, because the Go compiler says it's too big to inline.
num := int(ls.data[i]) + int(ls.data[i+1])<<8
i += 2
if num >= 0x8000 {
_, i = decodeVarintRest(num, ls.data, i)
}
} }
return false return false
} }