[Bug target/102024] [12 Regression] zero width bitfields and ABIs

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102024

--- Comment #5 from Segher Boessenkool <segher at gcc dot gnu.org> ---
"structure layout happens before the zero width bitfields are removed by the
FE".

So, what can break still, then?


-       li 9,0
-       sldi 9,9,32
-       mtvsrd 1,9
+       li 3,0
        std 0,16(1)
        stdu 1,-32(1)
        .cfi_def_cfa_offset 32
        .cfi_offset 65, 16
-       xscvspdpn 1,1
-       fmr 2,1

1) The old code was very inefficient, didn't have constants optimised;
2) The old code passed "s" in an FPR, the new one uses a GPR?  Can you also
show
what changed in "foo"?