Stanislav Mekhanoshin 44b865fa7f [AMDGPU] Allow narrowing muti-dword loads ...

Currently BE allows only a little load narrowing because
of the fear it will produce sub-dword ext loads. However,
we can always allow narrowing if we are shrinking one
multi-dword load to another multi-dword load.

In particular we were unable to reduce s_load_dwordx8 into
s_load_dwordx4 if identity shuffle was used to extract
low 4 dwords.

Differential Revision: https://reviews.llvm.org/D73133

2020-01-24 11:03:41 -08:00

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