Bitwise operations: Difference between revisions
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(defun shr (x width bits) |
(defun shr (x width bits) |
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"Compute bitwise |
"Compute bitwise right shift of x by 'bits' bits, represented on 'width' bits" |
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(logand (ash x (- bits)) |
(logand (ash x (- bits)) |
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(1- (ash 1 width)))) |
(1- (ash 1 width)))) |
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(defun rotr (x width bits) |
(defun rotr (x width bits) |
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"Compute bitwise |
"Compute bitwise right rotation of x by 'bits' bits, represented on 'width' bits" |
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(logior (logand (ash x (- (mod bits width))) |
(logior (logand (ash x (- (mod bits width))) |
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(1- (ash 1 width))) |
(1- (ash 1 width))) |
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