- (allocation result result node)
- (inst lea result (make-ea :byte :base result :disp other-pointer-lowtag))
- (inst shl boxed (- n-widetag-bits word-shift))
- (inst or boxed code-header-widetag)
- (storew boxed result 0 other-pointer-lowtag)
- (storew unboxed result code-code-size-slot other-pointer-lowtag)
- (storew nil-value result code-entry-points-slot other-pointer-lowtag))
- (storew nil-value result code-debug-info-slot other-pointer-lowtag)))
+ (allocation result result)
+ (inst lea result (make-ea :byte :base result :disp other-pointer-lowtag))
+ (storew type result 0 other-pointer-lowtag)
+ (storew length result vector-length-slot other-pointer-lowtag))))
+
+(define-vop (allocate-vector-on-stack)
+ (:args (type :scs (unsigned-reg) :to :save)
+ (length :scs (any-reg) :to :eval :target zero)
+ (words :scs (any-reg) :target ecx))
+ (:temporary (:sc any-reg :offset ecx-offset :from (:argument 2)) ecx)
+ (:temporary (:sc any-reg :offset eax-offset :from :eval) zero)
+ (:temporary (:sc any-reg :offset edi-offset) res)
+ (:results (result :scs (descriptor-reg) :from :load))
+ (:arg-types positive-fixnum
+ positive-fixnum
+ positive-fixnum)
+ (:translate allocate-vector)
+ (:policy :fast-safe)
+ (:node-var node)
+ (:generator 100
+ (inst lea result (make-ea :byte :base words :disp
+ (+ (1- (ash 1 n-lowtag-bits))
+ (* vector-data-offset n-word-bytes))))
+ (inst and result (lognot lowtag-mask))
+ ;; FIXME: It would be good to check for stack overflow here.
+ (move ecx words)
+ (inst shr ecx n-fixnum-tag-bits)
+ (allocation result result node t other-pointer-lowtag)
+ (inst cld)
+ (inst lea res
+ (make-ea :byte :base result :disp (- (* vector-data-offset n-word-bytes)
+ other-pointer-lowtag)))
+ (storew type result 0 other-pointer-lowtag)
+ (storew length result vector-length-slot other-pointer-lowtag)
+ (zeroize zero)
+ (inst rep)
+ (inst stos zero)))
+