[Bug tree-optimization/103427] Alignment of C++ references and 'this' pointer not used by optimizer

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=103427

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #0)
> Since https://reviews.llvm.org/D99790 Clang optimizes it:

Oops, I meant to paste this, from clang 13.0.0 at -O1

f(int&):                                 # @f(int&)
        mov     rax, rdi
        ret
My::Test1():                         # @My::Test1()
        mov     rax, rdi
        ret
My::Test2():                         # @My::Test2()
        mov     rax, rdi
        ret


The int& case has been optimized since Clang 11.0.0, and 13.0.0 started doing
the same for the 'this' pointer.