[Bug target/89967] Inefficient code generation for vld2q_lane_u8 under aarch64

[tnfchris at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=89967

Tamar Christina <tnfchris at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |tnfchris at gcc dot gnu.org
           See Also|                            |https://gcc.gnu.org/bugzill
                   |                            |a/show_bug.cgi?id=106106

--- Comment #3 from Tamar Christina <tnfchris at gcc dot gnu.org> ---
This is caused by SRA scalarizing the structural registers. i.e. it breaks
apart the uint8x16x2_t into two uint8x16_t, for use with vld2 we need them as a
whole, and so we recreate the type again.

This causes a copy through scalarization and then constructing the type again
in RTL. Reload is able to remove one copy but not the other.


The fix for #106106 will also fix this.