Benchmarking __half_positive patch on different versions of clang

benchmarking__half_positive.txt

Clang 3.9:
godbolt: https://gcc.godbolt.org/z/TLjio3

3.9 with __half_positive
--------------------------------------------------------------------------
Benchmark                                   Time           CPU Iterations
--------------------------------------------------------------------------
BM_LowerBound/random_int32/1024           125 ns        125 ns    5379856
BM_LowerBound/random_int32/1048576        286 ns        284 ns    2457943
BM_LowerBound/random_int64/1024           126 ns        125 ns    5529968
BM_LowerBound/random_strings/1024        7529 ns       7496 ns      93322

3.9 without __half_positive
--------------------------------------------------------------------------
Benchmark                                   Time           CPU Iterations
--------------------------------------------------------------------------
BM_LowerBound/random_int32/1024           150 ns        150 ns    4566180
BM_LowerBound/random_int32/1048576        352 ns        352 ns    1966950
BM_LowerBound/random_int64/1024           150 ns        150 ns    4632019
BM_LowerBound/random_strings/1024        7461 ns       7456 ns      93986

Clang 5.0:
godbolt: https://gcc.godbolt.org/z/fISQS2

5.0 with __half_positive
--------------------------------------------------------------------------
Benchmark                                   Time           CPU Iterations
--------------------------------------------------------------------------
BM_LowerBound/random_int32/1024           138 ns        137 ns    5058644
BM_LowerBound/random_int32/1048576        260 ns        259 ns    2668975
BM_LowerBound/random_int64/1024           104 ns        103 ns    6743088
BM_LowerBound/random_strings/1024        1344 ns       1338 ns     532166

5.0 without __half_positive
--------------------------------------------------------------------------
Benchmark                                   Time           CPU Iterations
--------------------------------------------------------------------------
BM_LowerBound/random_int32/1024           292 ns        291 ns    2406838
BM_LowerBound/random_int32/1048576       1821 ns       1811 ns     389086
BM_LowerBound/random_int64/1024           292 ns        291 ns    2399569
BM_LowerBound/random_strings/1024        1322 ns       1317 ns     531939

Clang 6.0:
godbolt: https://gcc.godbolt.org/z/bA_E5W

6.0 with __half_positive
--------------------------------------------------------------------------
Benchmark                                   Time           CPU Iterations
--------------------------------------------------------------------------
BM_LowerBound/random_int32/1024           119 ns        118 ns    5801714
BM_LowerBound/random_int32/1048576        249 ns        248 ns    2819511
BM_LowerBound/random_int64/1024           130 ns        130 ns    5343919
BM_LowerBound/random_strings/1024        1524 ns       1517 ns     477236
BM_LowerBoundSeanParent                    11 ns         11 ns   62049036

6.0 without __half_positive
--------------------------------------------------------------------------
Benchmark                                   Time           CPU Iterations
--------------------------------------------------------------------------
BM_LowerBound/random_int32/1024           292 ns        291 ns    2401504
BM_LowerBound/random_int32/1048576       1822 ns       1815 ns     386663
BM_LowerBound/random_int64/1024           293 ns        292 ns    2384903
BM_LowerBound/random_strings/1024        1496 ns       1491 ns     473514
BM_LowerBoundSeanParent                    25 ns         25 ns   28026233

Clang 7.0:
godbolt: https://gcc.godbolt.org/z/9-HUFd

7.0 with __half_positive
--------------------------------------------------------------------------
Benchmark                                   Time           CPU Iterations
--------------------------------------------------------------------------
BM_LowerBound/random_int32/1024            96 ns         96 ns    7078930
BM_LowerBound/random_int32/1048576        251 ns        250 ns    2785116
BM_LowerBound/random_int64/1024           119 ns        119 ns    5758047
BM_LowerBound/random_strings/1024        1397 ns       1391 ns     504490
BM_LowerBoundSeanParent                    11 ns         11 ns   61170097

7.0 without __half_positive
--------------------------------------------------------------------------
Benchmark                                   Time           CPU Iterations
--------------------------------------------------------------------------
BM_LowerBound/random_int32/1024           304 ns        304 ns    2310040
BM_LowerBound/random_int32/1048576       1790 ns       1783 ns     392788
BM_LowerBound/random_int64/1024           305 ns        304 ns    2298315
BM_LowerBound/random_strings/1024        1432 ns       1427 ns     489360
BM_LowerBoundSeanParent                    26 ns         26 ns   25977496