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3a04e0809f
This function mixes the bits in the hash value, which improves Dictionary performance for keys with bad hashes. PrecommitBenchmark changes with greater than 7% difference: ``````````Dictionary2`,```1456.00`,```1508.00`,```1502.00`,````624.00`,````607.00`,````592.00`,`864.00`,``145.9% ``````````Dictionary3`,```1379.00`,```1439.00`,```1408.00`,````585.00`,````567.00`,````552.00`,`827.00`,``149.8% ````````````Histogram`,````850.00`,````849.00`,````851.00`,```1053.00`,```1049.00`,```1048.00`,`199.00`,``-19.0% ````````````````Prims`,```1999.00`,```2005.00`,```2018.00`,```1734.00`,```1689.00`,```1701.00`,`310.00`,```18.4% ``````````StrSplitter`,```2365.00`,```2334.00`,```2316.00`,```1979.00`,```1997.00`,```2000.00`,`337.00`,```17.0% ```````````````TwoSum`,```1551.00`,```1568.00`,```1556.00`,```1771.00`,```1741.00`,```1716.00`,`165.00`,```-9.6% Regressions are in benchmarks that use `Int` as dictionary key: we are just doing more work than previously (hashing an `Int` was an identity function). rdar://17962402 Swift SVN r21142
53 lines
1.2 KiB
Swift
53 lines
1.2 KiB
Swift
// RUN: %target-build-swift -module-name a %s -o %t.out
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// RUN: %target-run %t.out
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//
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// This file contains reflection tests that depend on hash values.
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// Don't add other tests here.
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//
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import StdlibUnittest
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var Reflection = TestCase("Reflection")
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Reflection.test("Dictionary/Empty") {
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let dict = [Int : Int]()
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var output = ""
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dump(dict, &output)
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var expected = "- 0 key/value pairs\n"
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expectEqual(expected, output)
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}
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Reflection.test("Dictionary") {
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let dict = [ "One": 1, "Two": 2, "Three": 3, "Four": 4, "Five": 5 ]
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var output = ""
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dump(dict, &output)
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var expected = ""
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expected += "▿ 5 key/value pairs\n"
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expected += " ▿ [0]: (2 elements)\n"
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expected += " - .0: Five\n"
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expected += " - .1: 5\n"
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expected += " ▿ [1]: (2 elements)\n"
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expected += " - .0: Two\n"
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expected += " - .1: 2\n"
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expected += " ▿ [2]: (2 elements)\n"
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expected += " - .0: One\n"
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expected += " - .1: 1\n"
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expected += " ▿ [3]: (2 elements)\n"
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expected += " - .0: Three\n"
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expected += " - .1: 3\n"
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expected += " ▿ [4]: (2 elements)\n"
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expected += " - .0: Four\n"
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expected += " - .1: 4\n"
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expectEqual(expected, output)
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}
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runAllTests()
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