+(define-vop (%%nip-values)
+ (:args (last-nipped-ptr :scs (any-reg) :target dest)
+ (last-preserved-ptr :scs (any-reg) :target src)
+ (moved-ptrs :scs (any-reg) :more t))
+ (:results (r-moved-ptrs :scs (any-reg) :more t))
+ (:temporary (:sc any-reg) src)
+ (:temporary (:sc any-reg) dest)
+ (:temporary (:sc non-descriptor-reg) temp)
+ (:ignore r-moved-ptrs)
+ (:generator 1
+ (inst move dest last-nipped-ptr)
+ (inst move src last-preserved-ptr)
+ (inst cmp csp-tn src)
+ (inst b :le DONE)
+ (inst nop) ; not strictly necessary
+ LOOP
+ (loadw temp src)
+ (inst add dest dest n-word-bytes)
+ (inst add src src n-word-bytes)
+ (storew temp dest -1)
+ (inst cmp csp-tn src)
+ (inst b :gt LOOP)
+ (inst nop)
+ DONE
+ (inst move csp-tn dest)
+ (inst sub src src dest)
+ (loop for moved = moved-ptrs then (tn-ref-across moved)
+ while moved
+ do (sc-case (tn-ref-tn moved)
+ ((descriptor-reg any-reg)
+ (inst sub (tn-ref-tn moved) (tn-ref-tn moved) src))
+ ((control-stack)
+ (load-stack-tn temp (tn-ref-tn moved))
+ (inst sub temp temp src)
+ (store-stack-tn (tn-ref-tn moved) temp))))))