[Bug target/87317] Missed optimisation: merging VMOVQ with operations that only use the low 8 bytes

[hjl.tools at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87317

--- Comment #5 from H.J. Lu <hjl.tools at gmail dot com> ---
Created attachment 44702
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=44702&action=edit
A patch

Please try this.