[Issue 12509] New: Compiler performance highly depends on declared array size - for struct with long static array of structs

d-bugmail at puremagic.com d-bugmail at puremagic.com
Wed Apr 2 23:16:30 PDT 2014


https://d.puremagic.com/issues/show_bug.cgi?id=12509

           Summary: Compiler performance highly depends on declared array
                    size - for struct with long static array of structs
           Product: D
           Version: D2
          Platform: x86
        OS/Version: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: coolreader.org at gmail.com


--- Comment #0 from Vadim Lopatin <coolreader.org at gmail.com> 2014-04-02 23:16:28 PDT ---
Created an attachment (id=1342)
Source file to reproduce

DMD 2.065 under winXP/32 compiles following example very slow
> dmd main.d
(compliles very slow)
Not reproduced with 64bit compiler on linux
--- main.d --------------------------
module main;

struct Foo // must be struct to reproduce
{
    uint foo; // any data can be here
}

struct Bar // must be struct to reproduce
{
    // DMD 2.065 hang with 100% CPU load
    // works ok if array size is reduced
    Foo[0x20000] _array;
    //  0x4000 - < 1 second
    //  0x8000 - 5 seconds
    //  0xC000 - 15 seconds
    //  0xE000 - 20 seconds
    //  0x10000 - 25 seconds
    //  0x20000 - 1:45 
}

int main(string[] argv)
{
    return 0;
}
---------------------------------------

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