(:temporary (:scs (descriptor-reg) :from (:argument 0)) ptr)
(:temporary (:scs (non-descriptor-reg)) temp)
(:temporary (:scs (any-reg) :type fixnum :to (:result 0) :target result)
- count)
+ count)
(:results (result :scs (any-reg descriptor-reg)))
(:policy :fast-safe)
(:vop-var vop)
(:save-p :compute-only)
(:generator 50
- (move ptr object)
- (move count zero-tn)
-
- LOOP
-
- (inst beq ptr null-tn done)
- (inst nop)
-
- (inst and temp ptr lowtag-mask)
- (inst xor temp list-pointer-lowtag)
- (inst bne temp zero-tn not-list)
- (inst nop)
-
- (loadw ptr ptr cons-cdr-slot list-pointer-lowtag)
- (inst b loop)
- (inst addu count count (fixnumize 1))
-
- NOT-LIST
- (cerror-call vop done object-not-list-error ptr)
-
- DONE
- (move result count)))
-
+ (let ((done (gen-label))
+ (loop (gen-label))
+ (not-list (gen-label)))
+ (move ptr object)
+ (move count zero-tn)
-(define-static-fun length (object) :translate length)
+ (emit-label loop)
+
+ (inst beq ptr null-tn done)
+ (inst and temp ptr lowtag-mask)
+ (inst xor temp list-pointer-lowtag)
+ (inst bne temp not-list)
+ (inst nop)
+
+ (loadw ptr ptr cons-cdr-slot list-pointer-lowtag)
+ (inst b loop)
+ (inst addu count count (fixnumize 1))
+ (emit-label not-list)
+ (cerror-call vop done object-not-list-error ptr)
+ (emit-label done)
+ (move result count))))
+
+(define-static-fun length (object) :translate length)