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- bit_shift(+Shifter, ?Left, ?Right) is semidet
- Shifts bits left or right depending on the argument mode. Mode (+,
-, +) shifts left whereas mode (+, +, -) shifts right. The first
argument specifies the position of the bit or bits in Left, the
second argument, while the third argument specifies the aligned
Right bits. The shift moves in the direction of the variable
argument, towards the (-) mode argument.
The Shifter argument provides three different ways to specify a bit shift and bit width: either by an exclusive range using
+and-terms; or an inclusive range using:terms; or finally just a single bit shift which implies a width of one bit. Colons operate inclusively whereas plus and minus apply exclusive upper ranges.It first finds the amount of Shift required and the bit Width. After computing the lefthand and righthand bit masks, it finally performs a shift-mask or mask-shift for left and right shifts respectively.