[Bug target/85730] complex code for modifying lowest byte in a 4-byte vector

[zsojka at seznam dot cz]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85730

--- Comment #3 from Zdenek Sojka <zsojka at seznam dot cz> ---
(In reply to Gabriel Ravier from comment #2)
> Seems like they've all got identical code generation over here since GCC 7,
> and the GCC 6 code generation is just very bad for bar (although GCC 7 also
> changed bar and baz's code generation, which previously was as bar's is in
> the description)

I've got a different observation (using the branch HEADs, at -O3):
gcc-6 - ICEs
gcc-7, gcc-8, gcc-9 - the same code generated as in comment #1
gcc-10, gcc-11, gcc-12 - all functions are the same, bar() now has the same
assembly as foo() and baz() - but is that the optimal form?