Radu Berinde 43e94ff202 x/tools/container/intsets: use root block ... The root block was used as a sentinel. This means we always need to allocate a second block on the heap, even if the set has a few small elements. We now use the root block: it is always the block with the smallest offset. The logic becomes very messy if there is no sentinel; to avoid this we still use a sentinel (a special singleton block) and return it in when appropriate in the first, last, next wrappers. Also adding some benchmarks and making some optimizations: name old time/op new time/op delta Popcount-4 2.18ns ± 1% 2.21ns ± 1% +1.47% InsertProbeSparse_2_10-4 76.2ns ±23% 37.2ns ± 1% -51.21% InsertProbeSparse_10_10-4 240ns ±15% 162ns ± 4% -32.58% InsertProbeSparse_10_1000-4 419ns ± 4% 371ns ±19% -11.43% InsertProbeSparse_100_100-4 2.30µs ± 1% 1.93µs ± 1% -16.08% InsertProbeSparse_100_10000-4 2.12µs ± 3% 2.07µs ± 1% -2.11% UnionDifferenceSparse-4 165µs ±16% 170µs ± 9% ~ UnionDifferenceHashTable-4 310µs ±10% 291µs ±17% ~ AppendTo-4 11.0µs ± 0% 11.0µs ± 0% -0.35% name old alloc/op new alloc/op delta Popcount-4 0.00B ±NaN% 0.00B ±NaN% ~ InsertProbeSparse_2_10-4 64.0B ± 0% 0.0B ±NaN% -100.00% InsertProbeSparse_10_10-4 64.0B ± 0% 0.0B ±NaN% -100.00% InsertProbeSparse_10_1000-4 256B ± 0% 192B ± 0% -25.00% InsertProbeSparse_100_100-4 64.0B ± 0% 0.0B ±NaN% -100.00% InsertProbeSparse_100_10000-4 256B ± 0% 192B ± 0% -25.00% UnionDifferenceSparse-4 59.4kB ± 0% 59.2kB ± 0% -0.32% UnionDifferenceHashTable-4 138kB ± 0% 138kB ± 0% ~ AppendTo-4 0.00B ±NaN% 0.00B ±NaN% ~ name old allocs/op new allocs/op delta Popcount-4 0.00 ±NaN% 0.00 ±NaN% ~ InsertProbeSparse_2_10-4 1.00 ± 0% 0.00 ±NaN% -100.00% InsertProbeSparse_10_10-4 1.00 ± 0% 0.00 ±NaN% -100.00% InsertProbeSparse_10_1000-4 4.00 ± 0% 3.00 ± 0% -25.00% InsertProbeSparse_100_100-4 1.00 ± 0% 0.00 ±NaN% -100.00% InsertProbeSparse_100_10000-4 4.00 ± 0% 3.00 ± 0% -25.00% UnionDifferenceSparse-4 928 ± 0% 925 ± 0% -0.32% UnionDifferenceHashTable-4 271 ± 0% 271 ± 0% ~ AppendTo-4 0.00 ±NaN% 0.00 ±NaN% ~ Fixes golang/go#21311. Change-Id: Ie472a2afa269c21cb33b22ffdac8dd2594b816ac Reviewed-on: https://go-review.googlesource.com/53431 Reviewed-by: Alan Donovan <adonovan@google.com>		2017-08-21 15:22:10 +00:00
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popcnt_amd64.go	container/intsets: update build tags to exclude assembly from gccgo.	2015-11-11 01:35:11 +00:00
popcnt_amd64.s	container/intsets: update build tags to exclude assembly from gccgo.	2015-11-11 01:35:11 +00:00
popcnt_gccgo_c.c	container/intsets: use fast popcount with gccgo	2015-11-11 02:17:02 +00:00
popcnt_gccgo.go	container/intsets: use fast popcount with gccgo	2015-11-11 02:17:02 +00:00
popcnt_generic.go	container/intsets: use fast popcount with gccgo	2015-11-11 02:17:02 +00:00
sparse_test.go	x/tools/container/intsets: use root block	2017-08-21 15:22:10 +00:00
sparse.go	x/tools/container/intsets: use root block	2017-08-21 15:22:10 +00:00
util_test.go	container/intsets: popcount: use POPCNT on amd64, Hacker's Delight algorithm on 386	2015-10-01 19:57:28 +00:00
util.go	Revert "x/tools/container/intsets: remove unused function"	2017-03-01 14:51:44 +00:00