• Rick Arnold's avatar
    encoding/json: improve performance of Unmarshal on primitive types · eea0f199
    Rick Arnold authored
    Attempt 2. The first fix was much faster but ignored syntax errors.
    
    benchmark                      old ns/op    new ns/op    delta
    BenchmarkCodeEncoder            74993543     72982390   -2.68%
    BenchmarkCodeMarshal            77811181     75610637   -2.83%
    BenchmarkCodeDecoder           213337123    190144982  -10.87%
    BenchmarkCodeUnmarshal         212180972    190394852  -10.27%
    BenchmarkCodeUnmarshalReuse    202113428    182106660   -9.90%
    BenchmarkUnmarshalString            1343          919  -31.57%
    BenchmarkUnmarshalFloat64           1149          908  -20.97%
    BenchmarkUnmarshalInt64              967          778  -19.54%
    BenchmarkSkipValue              28851581     28414125   -1.52%
    
    benchmark                       old MB/s     new MB/s  speedup
    BenchmarkCodeEncoder               25.88        26.59    1.03x
    BenchmarkCodeMarshal               24.94        25.66    1.03x
    BenchmarkCodeDecoder                9.10        10.21    1.12x
    BenchmarkCodeUnmarshal              9.15        10.19    1.11x
    BenchmarkSkipValue                 69.05        70.11    1.02x
    
    Fixes #3949.
    
    R=rsc
    CC=golang-dev
    https://golang.org/cl/7231058
    eea0f199
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