store/[org.clojure/clojure "1.8.0"] clj::clojure.core/unchecked-multiply

Official Documentation

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Arities
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   [x y]

Docstring
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  Returns the product of x and y, both long.
  Note - uses a primitive operator subject to overflow.

Source

(defn unchecked-multiply
  "Returns the product of x and y, both long.
  Note - uses a primitive operator subject to overflow."
  {:inline (fn [x y] `(. clojure.lang.Numbers (unchecked_multiply ~x ~y)))
   :added "1.0"}
  [x y] (. clojure.lang.Numbers (unchecked_multiply x y)))

Example 1

Edit
;; demonstrate the the unchecked-multiply function cannot calculate
;; 1 trillion * 10 without throwing an exception

(def thous 1000)
;; => #'user/thous

(def trill (* thous thous thous thous))
;; => #'user/trill

(unchecked-multiply trill 10)
;; > java.lang.IllegalArgumentException: No matching method found: unchecked_multiply (NO_SOURCE_FILE:0)

(* trill 10)
;; => 10000000000000

Uses on crossclj