Complex_subtraction_bybuf   xtlang


Defined in:  https://github.com/digego/extempore/tree/v0.8.9/libs/core/math.xtm

Implementation

(bind-func Complex_subtraction_bybuf
  (lambda (a:Complexf* b:Complexf* c:Complexf* len:i64)
    (if (evenp len)
        (let ((aa:/4,float/* (cast a))
              (bb:/4,float/* (cast b))
              (cc:/4,float/* (cast c))
              (k 0))
          (dotimes (k (/ len 2))
            (pset! cc k (- (pref-ptr aa k) (pref-ptr bb k)))
            void))
        (let ((i 0))
          (dotimes (i len)
            (tset! (pref-ptr c i) 0
                   (- (tref (pref-ptr a i) 0)
                      (tref (pref-ptr b i) 0)))
            (tset! (pref-ptr c i) 1
                   (- (tref (pref-ptr a i) 1)
                      (tref (pref-ptr b i) 1))))
          void))))


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