ISRL(x,n) returns the result of logically shifting x to the right by n places, and padding on the left with zeroes.
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If x is REAL FIXED BIN(p,0) and:
Otherwise, x is converted to SIGNED REAL FIXED BIN(M,0) and the result has the same attributes.
The result is undefined if n is negative or if n is greater than M.
If x is nonnegative, ISRL(x,n) is equivalent to LOWER2(x,n); if x is negative, ISRL(x,n) is positive, unless n=0.