2.6.8.3.2 Operation

These instructions do the following:

Rotate the value from Rm right by 0, 8, 16 or 24 bits.

Extract bits from the resulting value:

SXTB extracts bits [7:0] and sign extends to 32 bits.
UXTB extracts bits [7:0] and zero extends to 32 bits.
SXTH extracts bits [15:0] and sign extends to 32 bits.
UXTH extracts bits [15:0] and zero extends to 32 bits.

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