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;; Code (defpackage #:bits (:use :cl :sb-ext :sb-c)) (in-package :bits) (defknown popcnt (fixnum) fixnum) (in-package :sb-vm) (define-vop (bits::popcnt) (:translate bits::popcnt) (:policy :fast-safe) (:args (x :target r)) (:arg-types fixnum) (:results (r)) (:result-types fixnum) (:generator 1 (inst popcnt r x))) (in-package :bits) (defun popcnt (x) (popcnt x)) ;; Usage (disassemble #'bits::popcnt) => ; disassembly for BITS::POPCNT ; Size: 21 bytes. Origin: #x52B0166A ; 6A: 498B4560 MOV RAX, [R13+96] ; no-arg-parsing entry point ; thread.binding-stack-pointer ; 6E: 488945F8 MOV [RBP-8], RAX ; 72: F3480FB8DA POPCNT RBX, RDX ; 77: 488BE5 MOV RSP, RBP ; 7A: F8 CLC ; 7B: 5D POP RBP ; 7C: C3 RET ; 7D: CC0F BREAK 15 ; Invalid argument count trap (popcnt 5) => 5 (popcnt -1) => -1 ;; POPCNT only acts as #'identity, but why?