anchor.diff:    (sys.lap-x86:ret))
   
   (sys.int::define-lap-function cons ((car cdr))
  -  (:gc :no-frame :layout #*0)
  +  (:gc :no-frame :layout #*0 :incoming-arguments :rcx)
     ;; Attempt to quickly allocate a cons. Will call SLOW-CONS if things get too hairy.
     ;; R8 = car; R9 = cdr
     ;; Check argument count.
     (sys.lap-x86:cmp64 :rcx #.(ash 2 #.sys.int::+n-fixnum-bits+))
     (sys.lap-x86:jne SLOW-PATH-BAD-ARGS)
  +  (:gc :no-frame :layout #*0)
     ;; Update allocation meter.
     (sys.lap-x86:mov64 :rbx (:constant *cons-allocation-count*))
     (sys.lap-x86:mov64 :rbx (:object :rbx #.sys.int::+symbol-value+))
  
positive.code:   (sys.lap-x86:ret)
    (:gc :frame)
    BAD-ARGUMENTS
    (sys.lap-x86:mov64 :r13 (:function sys.int::raise-invalid-argument-error))
    (sys.lap-x86:call (:object :r13 #.sys.int::+fref-entry-point+))
    (sys.lap-x86:ud2))
  
  ;;; Support function for APPLY.
  ;;; Takes a function & a list of arguments.
  
negative.code:   (sys.lap-x86:call (:object :r13 #.sys.int::+fref-entry-point+))
    (sys.lap-x86:ud2)
    bad-arguments
    (:gc :frame :incoming-arguments :rcx)
    (sys.lap-x86:mov64 :r13 (:function sys.int::raise-invalid-argument-error))
    (sys.lap-x86:lea64 :rbx (:rip (+ (- ENTRY-POINT 16) #.sys.int::+tag-object+)))
    (sys.lap-x86:leave)
    (:gc :no-frame :layout #*0 :incoming-arguments :rcx)
    (sys.lap-x86:jmp (:object :r13 #.sys.int::+fref-entry-point+)))
  
  (sys.int::define-lap-function sys.int::values-simple-vector ((simple-vector))
    "Returns the elements of SIMPLE-VECTOR as multiple values."
    ENTRY-POINT
    (:gc :no-frame :layout #*0 :incoming-arguments :rcx)
    (sys.lap-x86:push :rbp)
    (:gc :no-frame :layout #*00 :incoming-arguments :rcx)
    (sys.lap-x86:mov64 :rbp :rsp)
    (:gc :frame :incoming-arguments :rcx)
    ;; Check arg count.
    (sys.lap-x86:cmp64 :rcx #.(ash 1 sys.int::+n-fixnum-bits+)) ; fixnum 1
    (sys.lap-x86:jne bad-arguments)
    (:gc :frame)
    ;; Check type.
    (sys.lap-x86:mov8 :al :r8l)
    (sys.lap-x86:and8 :al #b1111)
  