https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110762
--- Comment #11 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #2)
> The
>
> (insn 13 4 14 2 (set (reg:V2SF 20 xmm0 [orig:91 x2 ] [91])
> (vec_select:V2SF (reg:V4SF 20 xmm0 [94])
> (parallel [
> (const_int 0 [0])
> (const_int 1 [0x1])
> ]))) "t.c":10:12 4394 {sse_storelps}
> (nil))
>
> insns are gone in split after reload.
The opinion is that the above insn leaves the upper half of xmm0 undefined.
