ckennelly 094c67de88 Speed up the EmitLiteral fast path, +1.62% for ZFlat benchmarks. ...

This is inspired by the Go version in
//third_party/golang/snappy/encode_amd64.s (emitLiteralFastPath)

        Benchmark         Base:Reference   (1)
--------------------------------------------------
(BM_ZFlat_0 1/cputime_ns)        9.669e-06  +1.65%
(BM_ZFlat_1 1/cputime_ns)        7.643e-07  +2.53%
(BM_ZFlat_10 1/cputime_ns)       1.107e-05  -0.97%
(BM_ZFlat_11 1/cputime_ns)       3.002e-06  +0.71%
(BM_ZFlat_12 1/cputime_ns)       2.338e-05  +7.22%
(BM_ZFlat_13 1/cputime_ns)       6.386e-05  +9.18%
(BM_ZFlat_14 1/cputime_ns)       0.0002256  -0.05%
(BM_ZFlat_15 1/cputime_ns)       7.608e-07  -1.29%
(BM_ZFlat_16 1/cputime_ns)        0.003236  -1.28%
(BM_ZFlat_17 1/cputime_ns)        2.58e-06  +0.52%
(BM_ZFlat_18 1/cputime_ns)         0.01538  +0.00%
(BM_ZFlat_19 1/cputime_ns)       1.436e-05  +6.21%
(BM_ZFlat_2 1/cputime_ns)        0.0001044  +4.99%
(BM_ZFlat_20 1/cputime_ns)       0.0001608  -0.18%
(BM_ZFlat_3 1/cputime_ns)         0.003745  +0.38%
(BM_ZFlat_4 1/cputime_ns)        8.144e-05  +6.21%
(BM_ZFlat_5 1/cputime_ns)        2.328e-06  -1.60%
(BM_ZFlat_6 1/cputime_ns)        2.391e-06  +0.06%
(BM_ZFlat_7 1/cputime_ns)         2.68e-06  -0.61%
(BM_ZFlat_8 1/cputime_ns)        8.852e-07  +0.19%
(BM_ZFlat_9 1/cputime_ns)        6.441e-07  +1.06%

geometric mean                              +1.62%

2017-01-26 21:38:49 +01:00

46 KiB

Raw Blame History

View Raw