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digitalmars.D.bugs - [Issue 3370] New: Compile-time global dynamic immutable arrays should NOT be constant-folded.

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=3370

           Summary: Compile-time global dynamic immutable arrays should
                    NOT be constant-folded.
           Product: D
           Version: 2.033
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Keywords: performance
          Severity: critical
          Priority: P2
         Component: DMD
        AssignedTo: nobody puremagic.com
        ReportedBy: dsimcha yahoo.com



The following program runs out of memory b/c foo is apparently allocated and
created every time through the loop:

import std.math, core.memory, std.stdio;

immutable real[] foo = [0,1,2,3,4];

void main() {
    GC.disable;

    foreach(i; 0..1_000_000_000) {
        auto bar = poly(i, foo);
    }
}

Changing the immutable to an enum results in the program still running out of
memory.  

Removing all references to immutability fixes the problem.  

Changing the array to a static array fixes the problem.

Initializing the array inside main() fixes the problem.

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Oct 06 2009
parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=3370


David Simcha <dsimcha yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |DUPLICATE



Marking as dup of bug 4298.  Although this report was filed first, 4298 is were
all the discussion is, and it's a somewhat better bug report.

*** This issue has been marked as a duplicate of issue 4298 ***

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Jul 25 2010