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23093f86ee
The O(n+m) complexity is obtained probabilistically by using Rabin-Karp algorithm, which provides the needed complexity unless exceptional collisions occur, without memory allocation. benchmark old ns/op new ns/op delta BenchmarkIndexHard1 6532331 4045886 -38.06% BenchmarkIndexHard2 8178173 4038975 -50.61% BenchmarkIndexHard3 6973687 4042591 -42.03% BenchmarkCountHard1 6270864 4071090 -35.08% BenchmarkCountHard2 7838039 4072853 -48.04% BenchmarkCountHard3 6697828 4071964 -39.20% BenchmarkIndexTorture 2730546 28934 -98.94% BenchmarkCountTorture 2729622 29064 -98.94% Fixes #4600. R=rsc, donovanhide, remyoudompheng CC=golang-dev https://golang.org/cl/7314095 |
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