[Issue 19841] Wrong ABI for C++ functions taking a struct by value

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19841

--- Comment #7 from Walter Bright <bugzilla at digitalmars.com> ---
Compiling the D version on Linux64 gives:

_D5test84oopsFZv:
                push    RBP
                mov     RBP,RSP
                sub     RSP,030h
                lea     RAX,-028h[RBP]
                xor     ECX,ECX
                mov     [RAX],RCX
                mov     8[RAX],RCX
                mov     010h[RAX],RCX
                mov     018h[RAX],RCX
                mov     -8[RBP],CL
                push    dword ptr -010h[RBP]
                push    dword ptr -018h[RBP]
                push    dword ptr -020h[RBP]
                push    dword ptr -028h[RBP]
                lea     RDI,-8[RBP]
                call      _ZN3BarC1E3Foo at PC32
                add     RSP,020h
                mov     RSP,RBP
                pop     RBP
                ret

which looks equivalent to the C++ code generated by kinke's godbolt example:

        push    rbp
        mov     rbp, rsp
        sub     rsp, 48
        mov     QWORD PTR [rbp-32], 0
        mov     QWORD PTR [rbp-24], 0
        mov     QWORD PTR [rbp-16], 0
        mov     QWORD PTR [rbp-8], 0
        lea     rax, [rbp-33]
        push    QWORD PTR [rbp-8]
        push    QWORD PTR [rbp-16]
        push    QWORD PTR [rbp-24]
        push    QWORD PTR [rbp-32]
        mov     rdi, rax
        call    Bar::Bar(Foo)
        add     rsp, 32
        nop
        leave
        ret

So I'm going to mark this as worksforme.

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