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From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/114843] aarch64: epilogue in _Unwind_RaiseException
 corrupts return value due to __builtin_eh_return
Date: Thu, 25 Apr 2024 23:55:40 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D114843

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |pinskia at gcc dot =
gnu.org

--- Comment #11 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I have a fix for aarch64, able to produce now:
```
f:
.LFB0:
        .cfi_startproc
        stp     x0, x1, [sp, -32]!
        .cfi_def_cfa_offset 32
        .cfi_offset 0, -32
        .cfi_offset 1, -24
        stp     x2, x3, [sp, 16]
        .cfi_offset 2, -16
        .cfi_offset 3, -8
        ldr     w0, [x0]
        cmp     w0, 5
        bne     .L8
        add     sp, sp, 32
        .cfi_remember_state
        .cfi_def_cfa_offset 0
        ret
.L8:
        .cfi_restore_state
        mov     x5, x1
        ldp     x2, x3, [sp, 16]
        ldp     x0, x1, [sp], 32
        .cfi_restore 1
        .cfi_restore 0
        .cfi_restore 2
        .cfi_restore 3
        .cfi_def_cfa_offset 0
        add     sp, sp, x5
        ret
        .cfi_endproc
```

Which is exactly what we should produce I think.
The patch is a bit more complex than I expected but that is due to how aarc=
h64
has some of the most complex epilogues.=