http://d.puremagic.com/issues/show_bug.cgi?id=11238

           Summary: Codegen error when this is a ref parameter to the
                    method
           Product: D
           Version: D2
          Platform: All
        OS/Version: Windows
            Status: NEW
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody@puremagic.com
        ReportedBy: aliloko@gmail.com


--- Comment #0 from ponce <aliloko@gmail.com> 2013-10-12 17:24:30 PDT ---
When executing the program:

struct A
{
    void f()
    {
        g(this);
    }

    void g(ref A res)
    {
        res.m = [m[1], m[0]]; // swap
    }

    int[2] m;
}

void main()
{
    A a;
    a.m[0] = 4;
    a.m[1] = 6;
    writefln("%s,%s", a.m[0], a.m[1]);
    a.f();
    writefln("%s,%s", a.m[0], a.m[1]);
    a.f();
    writefln("%s,%s", a.m[0], a.m[1]);
}

Output is:
4,6
6,6
6,6


But I'm expecting this, that DMD 2.062 does output:
4,6
6,4
4,6


DMD 2.063, DMD 2.063.2 and DMD 2.064 beta all have this bug.

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Andrej Mitrovic <andrej.mitrovich@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |andrej.mitrovich@gmail.com


--- Comment #1 from Andrej Mitrovic <andrej.mitrovich@gmail.com> 2013-10-12 18:06:38 PDT ---
Reduced, I think this bug is unrelated to ref'ness:

-----
import std.algorithm;
import std.stdio;

void main()
{
    int[2] arr;

    arr[0] = 1;
    arr[1] = 2;

    writeln(arr);

    arr = [arr[1], arr[0]];
    // swap(arr[1], arr[0]);  // workaround

    writeln(arr);
}
-----

$ dmd -run test.d
> [1, 2]
> [2, 2]

Versions older than 2.063 don't seem to have this issue.

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Kenji Hara <k.hara.pg@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |pull, wrong-code
         OS/Version|Windows                     |All


--- Comment #2 from Kenji Hara <k.hara.pg@gmail.com> 2013-10-19 10:01:08 PDT ---
https://github.com/D-Programming-Language/dmd/pull/2682(In reply to comment #1)
> Versions older than 2.063 don't seem to have this issue.

The cause was the fix of bug 2356.

https://github.com/D-Programming-Language/dmd/pull/2682

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--- Comment #3 from github-bugzilla@puremagic.com 2013-10-20 10:20:10 PDT ---
Commits pushed to master at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/b033705cb88b83de5bcad93ef3fbe9966c347aa7 fix Issue 11238 - Codegen error when this is a ref parameter to the method

Revert a part of the fix for issue 2356, to avoid aliasing issue.

https://github.com/D-Programming-Language/dmd/commit/7d3b38e87c3722df34d8e23762b9b97b8945c0e5 Merge pull request #2682 from 9rnsr/fix11238

[REG2.063] Issue 11238 - Codegen error when this is a ref parameter to the method

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--- Comment #4 from github-bugzilla@puremagic.com 2013-10-20 10:20:42 PDT ---
Commit pushed to 2.064 at https://github.com/D-Programming-Language/dmd

https://github.com/D-Programming-Language/dmd/commit/f2c996a0220230762677a665842f402f576499c5 Merge pull request #2682 from 9rnsr/fix11238

[REG2.063] Issue 11238 - Codegen error when this is a ref parameter to the method

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Walter Bright <bugzilla@digitalmars.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |bugzilla@digitalmars.com
         Resolution|                            |FIXED


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