Fix #12358: Avoid spurious unions in simplification #12367
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test performance with #exhaustivity please |
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Performance test finished successfully: Visit https://dotty-bench.epfl.ch/12367/ to see the changes. Benchmarks is based on merging with master (f84322e) |
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if I test with 120 cases in the repl it seems to be much slower with this change def foo(x: List[Int]): Unit = x match { case x1 :: x2 :: x3 :: x4 :: x5 :: x6 :: x7 :: x8 :: x9 :: x10 :: x11 :: x12 :: x13 :: x14 :: x15 :: x16 :: x17 :: x18 :: x19 :: x20 :: x21 :: x22 :: x23 :: x24 :: x25 :: x26 :: x27 :: x28 :: x29 :: x30 :: x31 :: x32 :: x33 :: x34 :: x35 :: x36 :: x37 :: x38 :: x39 :: x40 :: x41 :: x42 :: x43 :: x44 :: x45 :: x46 :: x47 :: x48 :: x49 :: x50 :: x51 :: x52 :: x53 :: x54 :: x55 :: x56 :: x57 :: x58 :: x59 :: x60 :: x61 :: x62 :: x63 :: x64 :: x65 :: x66 :: x67 :: x68 :: x69 :: x70 :: x71 :: x72 :: x73 :: x74 :: x75 :: x76 :: x77 :: x78 :: x79 :: x80 :: x81 :: x82 :: x83 :: x84 :: x85 :: x86 :: x87 :: x88 :: x89 :: x90 :: x91 :: x92 :: x93 :: x94 :: x95 :: x96 :: x97 :: x98 :: x99 :: x100 :: x101 :: x102 :: x103 :: x104 :: x105 :: x106 :: x107 :: x108 :: x109 :: x110 :: x111 :: x112 :: x113 :: x114 :: x115 :: x116 :: x117 :: x118 :: x119 :: x120 :: Nil => } |
Thanks for trying. I'd suggest to handle it separately, as this PR is a blocker for #12357 . |
I just tried, both this PR and |
Thanks @griggt . I think we may have to tolerate the case. From https://dotty-bench.epfl.ch/12367/, the test |
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Merge now to unblock #12357. |
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Fix #12358: Avoid spurious unions in simplification
And be more lazier in product subtraction