(:arg-types * positive-fixnum positive-fixnum)
(:temporary (:sc any-reg :offset rsi-offset :from (:argument 0)) src)
(:temporary (:sc descriptor-reg :offset rax-offset) temp)
- (:temporary (:sc unsigned-reg :offset rcx-offset) temp1)
+ (:temporary (:sc unsigned-reg :offset rcx-offset) loop-index)
(:results (start :scs (any-reg))
(count :scs (any-reg)))
(:generator 20
(move count num)
(inst sub count skip)))
- (move temp1 count)
+ (move loop-index count)
(inst mov start rsp-tn)
(inst jecxz DONE) ; check for 0 count?
- (inst shr temp1 word-shift) ; convert the fixnum to a count.
+ (inst sub rsp-tn count)
+ (inst sub src count)
- (inst std) ; move down the stack as more value are copied to the bottom.
LOOP
- (inst lods temp)
- (inst push temp)
- (inst loop LOOP)
+ (inst mov temp (make-ea :qword :base src :index loop-index))
+ (inst sub loop-index n-word-bytes)
+ (inst mov (make-ea :qword :base rsp-tn :index loop-index) temp)
+ (inst jmp :nz LOOP)
DONE))