https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89049
--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
In the assembly I notice
vinsertf128 $0x1, 16(%rdi), %ymm4, %ymm2
...
vextractf128 $0x1, %ymm2, %xmm1
somehow we fail to elide the initial %ymm2 build with the upper half
extraction being the only use... possibly because it has a memory
operand?
