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From: "ibuclaw at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug d/106977] [13 regression] d21 dies with SIGBUS on 32-bit Darwin
Date: Fri, 24 Feb 2023 02:03:19 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106977

--- Comment #21 from ibuclaw at gcc dot gnu.org ---
There is something about the Darwin ABI I'm just not getting from looking at
the front-end alone though:

C++ Darwin 32-bit calling a method that returns an 8 byte struct:
```
__Z4testP3Bar:
        subl    $24, %esp
        movl    28(%esp), %eax
        movl    (%eax), %edx
        pushl   %eax            // <--
        call    *(%edx)
```

C++ Linux 32-bit calling a method that returns an 8 byte struct:
```
_Z4testP3Bar:
        subl    $44, %esp
        movl    %gs:20, %edx
        movl    %edx, 28(%esp)
        xorl    %edx, %edx
        movl    48(%esp), %eax
        leal    8(%esp), %ecx
        subl    $8, %esp
        movl    (%eax), %edx
        pushl   %eax            // <--
        pushl   %ecx            // <--
        call    *(%edx)
```=