returning struct or union with just double on Win32/x86

[Jay K]

typedef struct { double d; } Struct;


Struct f1 ()
{ 
Struct res = {3.0};
return res;
}

typedef union { double d; } Union;


Union f2 ()
{
Union res = {3.0};
return res;
}

x86 mingw 7.3.0

The first returns in ST0, the  second in edx:eax.

Msvc returns first in edx:eax.

Seems like a bug?

Thank you,
 - Jay