- (sc-case skip
- (immediate
- (cond ((zerop (tn-value skip))
- (move src context)
- (move count num))
- (t
- (inst lea src (make-ea :dword :base context
- :disp (- (* (tn-value skip)
- n-word-bytes))))
- (move count num)
- (inst sub count (* (tn-value skip) n-word-bytes)))))
-
- (any-reg
- (move src context)
- #!+#.(cl:if (cl:= sb!vm:word-shift sb!vm:n-fixnum-tag-bits) '(and) '(or))
- (inst sub src skip)
- #!-#.(cl:if (cl:= sb!vm:word-shift sb!vm:n-fixnum-tag-bits) '(and) '(or))
- (progn
- ;; FIXME: This can't be efficient, but LEA (my first choice)
- ;; doesn't do subtraction.
- (inst shl skip (- word-shift n-fixnum-tag-bits))
- (inst sub src skip)
- (inst shr skip (- word-shift n-fixnum-tag-bits)))
- (move count num)
- (inst sub count skip)))