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Mainly through manual inlining.

BenchmarkEncodeDigitsSpeed1e4-32     53121         47995         -9.65%
BenchmarkEncodeDigitsSpeed1e5-32     686799        630834        -8.15%
BenchmarkEncodeDigitsSpeed1e6-32     6636421       6054570       -8.77%
BenchmarkEncodeTwainSpeed1e4-32      77016         69146         -10.22%
BenchmarkEncodeTwainSpeed1e5-32      690640        634364        -8.15%
BenchmarkEncodeTwainSpeed1e6-32      6915519       6367504       -7.92%

BenchmarkEncodeDigitsSpeed1e4-32     188.25       208.35       1.11x
BenchmarkEncodeDigitsSpeed1e5-32     145.60       158.52       1.09x
BenchmarkEncodeDigitsSpeed1e6-32     150.68       165.16       1.10x
BenchmarkEncodeTwainSpeed1e4-32      129.84       144.62       1.11x
BenchmarkEncodeTwainSpeed1e5-32      144.79       157.64       1.09x
BenchmarkEncodeTwainSpeed1e6-32      144.60       157.05       1.09x

Mainly through manual inlining.

```
BenchmarkEncodeDigitsSpeed1e4-32     53121         47995         -9.65%
BenchmarkEncodeDigitsSpeed1e5-32     686799        630834        -8.15%
BenchmarkEncodeDigitsSpeed1e6-32     6636421       6054570       -8.77%
BenchmarkEncodeTwainSpeed1e4-32      77016         69146         -10.22%
BenchmarkEncodeTwainSpeed1e5-32      690640        634364        -8.15%
BenchmarkEncodeTwainSpeed1e6-32      6915519       6367504       -7.92%

BenchmarkEncodeDigitsSpeed1e4-32     188.25       208.35       1.11x
BenchmarkEncodeDigitsSpeed1e5-32     145.60       158.52       1.09x
BenchmarkEncodeDigitsSpeed1e6-32     150.68       165.16       1.10x
BenchmarkEncodeTwainSpeed1e4-32      129.84       144.62       1.11x
BenchmarkEncodeTwainSpeed1e5-32      144.79       157.64       1.09x
BenchmarkEncodeTwainSpeed1e6-32      144.60       157.05       1.09x
```
@klauspost klauspost changed the title flate: Improve level 1 speed flate: Improve level 1 speed by 10% Jan 31, 2022
@klauspost klauspost changed the title flate: Improve level 1 speed by 10% flate: Improve level 1 speed by ~10% Jan 31, 2022
@klauspost klauspost merged commit 61f58c1 into master Jan 31, 2022
@klauspost klauspost deleted the improve-level1-flate branch January 31, 2022 11:37
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