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chunks: helper for bit range

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This commit is contained in:
Fabian Reinartz 2016-12-07 15:37:37 +01:00
parent 9b459458d0
commit c5945177fb
2 changed files with 13 additions and 9 deletions
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12
chunks/chunk_test.go
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@ -94,10 +94,10 @@ func benchmarkIterator(b *testing.B, newChunk func(int) Chunk) {
) )
var exp []pair var exp []pair
for i := 0; i < b.N; i++ { for i := 0; i < b.N; i++ {
// t += int64(rand.Intn(10000) + 1) t += int64(rand.Intn(10000) + 1)
t += int64(1000) // t += int64(1000)
// v = rand.Float64() // v = rand.Float64()
// v += float64(100) v += float64(100)
exp = append(exp, pair{t: t, v: v}) exp = append(exp, pair{t: t, v: v})
} }
@ -161,10 +161,10 @@ func benchmarkAppender(b *testing.B, newChunk func(int) Chunk) {
) )
var exp []pair var exp []pair
for i := 0; i < b.N; i++ { for i := 0; i < b.N; i++ {
// t += int64(rand.Intn(10000) + 1) t += int64(rand.Intn(10000) + 1)
t += int64(1000) // t += int64(1000)
// v = rand.Float64() // v = rand.Float64()
// v += float64(100) v += float64(100)
exp = append(exp, pair{t: t, v: v}) exp = append(exp, pair{t: t, v: v})
} }

10
chunks/xor.go
View file

@ -120,13 +120,13 @@ func (a *xorAppender) Append(t int64, v float64) error {
switch { switch {
case dod == 0: case dod == 0:
a.b.writeBit(zero) a.b.writeBit(zero)
case -8191 <= dod && dod <= 8192: case bitRange(dod, 14):
a.b.writeBits(0x02, 2) // '10' a.b.writeBits(0x02, 2) // '10'
a.b.writeBits(uint64(dod), 14) a.b.writeBits(uint64(dod), 14)
case -65535 <= dod && dod <= 65536: case bitRange(dod, 17):
a.b.writeBits(0x06, 3) // '110' a.b.writeBits(0x06, 3) // '110'
a.b.writeBits(uint64(dod), 17) a.b.writeBits(uint64(dod), 17)
case -524287 <= dod && dod <= 524288: case bitRange(dod, 20):
a.b.writeBits(0x0e, 4) // '1110' a.b.writeBits(0x0e, 4) // '1110'
a.b.writeBits(uint64(dod), 20) a.b.writeBits(uint64(dod), 20)
default: default:
@ -152,6 +152,10 @@ func (a *xorAppender) Append(t int64, v float64) error {
return nil return nil
} }
func bitRange(x int64, nbits uint8) bool {
return -((1<<(nbits-1))-1) <= x && x <= 1<<(nbits-1)
}
func (a *xorAppender) writeVDelta(v float64) { func (a *xorAppender) writeVDelta(v float64) {
vDelta := math.Float64bits(v) ^ math.Float64bits(a.v) vDelta := math.Float64bits(v) ^ math.Float64bits(a.v)