When merging a pair of DS reads or writes needs to materialize the base
offset in a vgpr, choose a value that is aligned to as high a power of
two as possible. This maximises the chance that different pairs can use
the same base offset, in which case the base offset registers can be
commoned up by MachineCSE.
Differential Revision: https://reviews.llvm.org/D96421
This is to fix performance regressions introduced by
86c944d790.
The old search would collect all potentially mergeable instructions in
the entire block. In this case, the same address is written in
multiple places in the block on the other side of a fence. When sorted
by offset, the two unmergeable, identical addresses would be next to
each other and the merge would give up.
Break the search space when we encounter an instruction we won't be
able to merge across. This will keep the identical addresses in
different merge attempts.
This may also improve compile time by reducing the merge list size.
Jay Foad