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Constants-conversions-and-bounds

N64-to-i64

Signature
(n64-to-i64 x) → *
Arguments: x — Guard (n64p x).

Definitions and Theorems

Function: n64-to-i64$inline

(defun n64-to-i64$inline (x)
  (declare (type (unsigned-byte 64) x))
  (declare (xargs :guard (n64p x)))
  (mbe :logic (logext 64 x)
       :exec
       (if (< x 9223372036854775808)
           x
         (- x 18446744073709551616))))