tenderlove/aarch64

SWPB, SWPAB, SWPALB, SWPLB -- A64

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Implement SWPB instruction

Description:

Swap byte in memory

Assembly template:

SWPAB  <Ws>, <Wt>, [<Xn|SP>]
SWPALB  <Ws>, <Wt>, [<Xn|SP>]
SWPB  <Ws>, <Wt>, [<Xn|SP>]
SWPLB  <Ws>, <Wt>, [<Xn|SP>]