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

[d-bugmail at puremagic.com]

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 at puremagic.com
        ReportedBy: dsimcha at yahoo.com


--- Comment #0 from David Simcha <dsimcha at yahoo.com> 2009-10-06 15:04:05 PDT ---
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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