https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89654
--- Comment #2 from Uroš Bizjak <ubizjak at gmail dot com> ---
Without STV, there are too many moves. -O2 -m32 -mno-stv should generate
something like:
movl 4(%esp), %eax
movl 8(%esp), %edx
shldl $3, %eax, %edx
shll $3, %eax
retl
