[Issue 5294] -O optimization breaks for loop

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=5294


Don <clugdbug at yahoo.com.au> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |clugdbug at yahoo.com.au
            Version|unspecified                 |D1 & D2


--- Comment #2 from Don <clugdbug at yahoo.com.au> 2010-12-01 16:26:06 PST ---
Applies to all D1 and D2, even prehistoric versions (tested as far back as
DMD0.140).

Very weird. In bearophile's test case, written as 

    for (int i = 0; i < A; i++) {
        count++;
        foo(i * 5 - B); // comment this out and it makes 2 loops
    }

it fails for B = (5+1)..(5*A) inclusive (eg, 6, 7, 8, 9, 10 all fail for A==2).

And if it is foo(i*6 - B), it fails for B= 7..6*A.

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