Function r

Function that performs an arithmetic shift to the right of the specified number of bits.

Syntax	i32 r_shr (i32 value, i32 nBit)
value	Unit on which to perform the shift
nBit	Number of bits
result	Returns the result of the shift
Validity	Rule, Task
Note	In right shift the lightest bit exiting to the right is lost. In the heaviest bit a 0 enters if it was in 0 a 1 enters if it was in 1 (sign is kept)

Example usage:

r(100) = r_shr(r(101), 3)

; Assuming a value of r(101) = 0x12481248, after execution of the function the contents of r(100) will be : 0x02490249

NOTE: Since the lightest bit does not exit to the right the behavior is similar to r_ror().

Example usage:

r(100) = r_rshr(r(101), 4)

; Assuming a value of r(101) = 0x12481248, after execution of the instruction the contents of r(100) will be : 0x01248124

Example usage:

r(1) = r_shl(r(1), 1)

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