The shift types are :
LSL Logical Shift Left (*2)
LSR Logical Shift Right (/2)
ASR Arithmetic Shift Right (/2)
ROR ROtate Right
RRX Rotate Right eXtended
In ASR, the arithmetic sign of the number is preserved (+ve/-ve).
In ROR, the bit lost is also copied back to bit 31. RRX is similar, but this time the carry flag acts as 'bit 32'.
In all cases, the bit lost from the end is shifted into the carry flag (if the update status flag 'S' is set).
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