Matt Arsenault aa7941289e AMDGPU: Fold copy of scalar add of frame index (#115058) ...

This is a pre-optimization to avoid a regression in a future
commit. Currently we almost always emit frame index with
a v_mov_b32 and use vector adds for the pointer operations. We
need to consider the users of the frame index (or rather, the
transitive users of derived pointer operations) to know whether
the value will be used in a vector or scalar context. This saves
an sgpr->vgpr copy.

This optimization could be more general for any opcode that's
trivially convertible from a scalar to vector form (although this
is a workaround for a proper regbankselect).

2024-11-06 09:10:58 -08:00

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