[Issue 3736] New: corrupted struct returned by function with optimizations (-O)

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=3736

           Summary: corrupted struct returned by function with
                    optimizations (-O)
           Product: D
           Version: 2.030
          Platform: Other
        OS/Version: Windows
            Status: NEW
          Keywords: wrong-code
          Severity: regression
          Priority: P2
         Component: DMD
        AssignedTo: nobody at puremagic.com
        ReportedBy: spam at extrawurst.org


--- Comment #0 from Stephan Dilly <spam at extrawurst.org> 2010-01-23 10:02:04 PST ---
building the following code with -O corrupts the return value of getFoo.
sorry could not reduce it more:

import std.stdio;

struct Foo
{
    float x=0;
}

struct Bar
{
    Foo p0;
    Foo p1;
}

Bar a = {Foo(0),Foo(400)};

Foo getFoo(Foo _pos)
{
    Bar stillok = a;

    float d0 = (a.p0.x - _pos.x);
    float d1 = (a.p0.x - _pos.x);

    if( d0 > d1 )
    {
        return stillok.p0;
    }
    else
    {
        return stillok.p1;
    }
}

void main()
{
    writefln("%s", getFoo( Foo(100) ).x );
}

// prints 6.91062e-39 under dmd2039
// prints 3.2372e-39 under dmd2030

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