Mitch Curtis 4f2c96eaa8 Iterate over the smaller set in QSet::intersect(). ... When calling intersect() on a large (1000000 items) QSet, with a small (1000 items) QSet as the argument, the function takes signifcantly longer than when the operand and the argument are reversed. This is because the operand set is always iterated over in its entirety. This patch changes intersect() to iterate over the smaller set. This reduces the large operand scenario's benchmark to ~0.000063 milliseconds, compared to the current ~134 milliseconds: 1000000.intersect(1000) = empty: 0.000063 (was 134) 1000.intersect(1000000) = empty: 0.000039 (was 0.000036) 1000000.intersect(1000) = 500: 0.10 vs (was 130) 1000.intersect(1000000) = 500: 0.023 vs (was 0.093) 1000000.intersect(1000) = 1000: 0.20 vs (was 139) 1000.intersect(1000000) = 1000: 0.017 vs (was 0.016) Task-number: QTBUG-22026 Change-Id: I54b25c49c78c458fef355e9c6222da8a64c7681f Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@digia.com> Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>		2013-06-05 09:35:42 +02:00
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main.cpp	Iterate over the smaller set in QSet::intersect().	2013-06-05 09:35:42 +02:00
qset.pro	Iterate over the smaller set in QSet::intersect().	2013-06-05 09:35:42 +02:00