[Bug target/87743] Vectorizer doesn't support conversion of different sizes

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87743

--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
(In reply to Andrew Pinski from comment #4)
> Even for x86_64:
>         vmovdqa src(%rip), %xmm0
>         vpmovsxdq       %xmm0, %xmm1
>         vpsrldq $8, %xmm0, %xmm0
>         vpmovsxdq       %xmm0, %xmm0
>         vmovaps %xmm1, dst(%rip)
>         vmovaps %xmm0, 16+dst(%rip)
>         ret

Only when AVX2 is disabled.