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Integral

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  • Selwyn Simsek

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Copyright (c) 2022 Selwyn Simsek

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integral's Issues

Maybe simplify AS-SIGNED-32-BIT-INTEGER

integral/src/main.lisp

Lines 8 to 13 in c692319

(defun as-signed-32-bit-integer (thing)
"Converts thing to a signed 32 bit integer."
(assert (typep thing 'integer))
(cond ((zerop thing) 0)
((plusp thing) (logand thing #. (1- (expt 2 31))))
(t (lognot (logand (lognot thing) #. (1- (expt 2 31)))))))

Maybe the below?

(defun as-signed-32-bit-integer (x) (mod x (ash 1 32)))

CL-USER> (mod 1 (ash 1 32))
1
CL-USER> (format nil "#B~32,'0B" *)
"#B00000000000000000000000000000001"
CL-USER> (mod -1 (ash 1 32))
4294967295
CL-USER> (format nil "#B~32,'0B" *)
"#B11111111111111111111111111111111"

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