tenderlove/aarch64

SXTB -- A64

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tenderlove commented

Implement SXTB_SBFM instruction

Description:

Signed Extend Byte

Assembly template:

SXTB  <Wd>, <Wn>
SBFM <Wd>, <Wn>, #0, #7
SXTB  <Xd>, <Wn>
SBFM <Xd>, <Xn>, #0, #7