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| author | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-05-19 17:18:02 -0500 |
|---|---|---|
| committer | Noah Goldstein <goldstein.w.n@gmail.com> | 2022-05-23 10:38:40 -0500 |
| commit | 3d155d4b6c29ddfd0b3318fa58dbf8ef20e7bca0 (patch) | |
| tree | 657361ebb5f51b9d0b8d307efda8209e52cb2700 /sysdeps | |
| parent | 319dddc143d0c59cc48661fa141ae575f80a074a (diff) | |
| download | glibc-3d155d4b6c29ddfd0b3318fa58dbf8ef20e7bca0.tar glibc-3d155d4b6c29ddfd0b3318fa58dbf8ef20e7bca0.tar.gz glibc-3d155d4b6c29ddfd0b3318fa58dbf8ef20e7bca0.tar.bz2 glibc-3d155d4b6c29ddfd0b3318fa58dbf8ef20e7bca0.zip | |
nss: Optimize nss_hash in nss_hash.c
The prior unrolling didn't really do much as it left the dependency
chain between iterations. Unrolled the loop for 4 so 4x multiplies
could be pipelined in out-of-order machines.
Results for __nss_hash
Benchmarked on Tigerlake: 11th Gen Intel(R) Core(TM) i7-1165G7 @ 2.80GHz
Time as Geometric Mean of N=25 runs
Geometric of all benchmark New / Old: 0.845
type, length, New Time, Old Time, New Time / Old Time
fixed, 0, 4.019, 3.729, 1.078
fixed, 1, 4.95, 5.707, 0.867
fixed, 2, 5.152, 5.657, 0.911
fixed, 3, 4.641, 5.721, 0.811
fixed, 4, 5.551, 5.81, 0.955
fixed, 5, 6.525, 6.552, 0.996
fixed, 6, 6.711, 6.561, 1.023
fixed, 7, 6.715, 6.767, 0.992
fixed, 8, 7.874, 7.915, 0.995
fixed, 9, 8.888, 9.767, 0.91
fixed, 10, 8.959, 9.762, 0.918
fixed, 11, 9.188, 9.987, 0.92
fixed, 12, 9.708, 10.618, 0.914
fixed, 13, 10.393, 11.14, 0.933
fixed, 14, 10.628, 12.097, 0.879
fixed, 15, 10.982, 12.965, 0.847
fixed, 16, 11.851, 14.429, 0.821
fixed, 32, 24.334, 34.414, 0.707
fixed, 64, 55.618, 86.688, 0.642
fixed, 128, 118.261, 224.36, 0.527
fixed, 256, 256.183, 538.629, 0.476
random, 2, 11.194, 11.556, 0.969
random, 4, 17.516, 17.205, 1.018
random, 8, 23.501, 20.985, 1.12
random, 16, 28.131, 29.212, 0.963
random, 32, 35.436, 38.662, 0.917
random, 64, 45.74, 58.868, 0.777
random, 128, 75.394, 121.963, 0.618
random, 256, 139.524, 260.726, 0.535
Reviewed-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Diffstat (limited to 'sysdeps')
0 files changed, 0 insertions, 0 deletions