David Green 5805521207 [ARM] Simplify VMOVRRD from extracts of buildvectors ...

Under the softfp calling convention, we are often left with
VMOVRRD(extract(bitcast(build_vector(a, b, c, d)))) for the return value
of the function. These can be simplified to a,b or c,d directly,
depending on the value of the extract.

Big endian is a little different because the bitcast switches the lanes
around, meaning we end up with b,a or d,c.

Differential Revision: https://reviews.llvm.org/D94989

2021-02-01 16:09:25 +00:00

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