[Issue 287] DMD optimization bug arround dynamic array length

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=287


deewiant at gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |deewiant at gmail.com
           Keywords|                            |wrong-code
            Version|0.163                       |0.164




------- Comment #3 from deewiant at gmail.com  2006-08-19 04:10 -------
My reduced version, with some inline comments:

import std.stdio : writefln;

void main() {
        int lng, lngnew;

        int[] arr = new int[1];

        for (int i = 10; i--;) {
                // removing one of the pairs of assignments to lng/lngnew
                // fixes the bug
                lngnew = lng + arr.length;
                lng = lngnew;

                lngnew = lng + arr.length;

                // moving this writefln to anywhere except between either pair
                // of assignments to lng/lngnew fixes the bug
                writefln("%2d %2d %2d", lng, lngnew, arr.length);

                // changing either "lng = lngnew" to the equivalent statement
                // "lng += arr.length" fixes the bug
                lng = lngnew;
        }
}


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