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
