[Bug target/102143] ABI incompatibility with clang when passing 32bit vectors on 32bit i686

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102143

--- Comment #3 from Uroš Bizjak <ubizjak at gmail dot com> ---
gcc has also some problems in this area. With -mregparm=3, one would expect
arguments obeying integer ABI to be passed in registers, but regparm flag has
no effect and the same code is produced:

foo:
        movd    4(%esp), %xmm0
        movd    8(%esp), %xmm1
        paddw   %xmm1, %xmm0
        movd    %xmm0, %eax
        ret