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Improve make-vector compilation for known big sizes

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* module/language/tree-il/compile-cps.scm
  (emit-initializations-as-loop): New helper.
  (make-vector): Use new helper.
  (make-vector/immediate): Emit a loop if the number of words is greater
  than or equal to 32.  An arbitrary limit that could be adjusted later.
This commit is contained in:
Andy Wingo 2018-01-07 22:50:55 +01:00
parent 5e1109a97f
commit 55a8483435
1 changed files with 49 additions and 28 deletions
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77
module/language/tree-il/compile-cps.scm
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@ -345,6 +345,25 @@
($continue k src
($primcall 'scm-set!/immediate `(vector . ,pos) (v val)))))))
(define (emit-initializations-as-loop cps k src obj annotation start nwords init)
(with-cps cps
(letv pos)
(letk kloop ,#f) ;; Patched later.
(letk kback
($kargs () ()
($continue kloop src
($primcall 'uadd/immediate 1 (pos)))))
(letk kinit
($kargs () ()
($continue kback src
($primcall 'scm-set! annotation (obj pos init)))))
(setk kloop
($kargs ('pos) (pos)
($branch k kinit src 'u64-< #f (pos nwords))))
(build-term
($continue kloop src
($primcall 'load-u64 start ())))))
(define-primcall-converter allocate-vector
(lambda (cps k src op param)
(define size param)
@ -374,26 +393,13 @@
cps src op size 0 (target-max-vector-length)
(lambda (cps ssize)
(with-cps cps
(letv usize nwords v w0-high w0 pos)
(letk kloop ,#f) ;; Patched later.
(letv usize nwords v w0-high w0)
(letk kdone
($kargs () ()
($continue k src ($values (v)))))
(letk kback
($kargs () ()
($continue kloop src
($primcall 'uadd/immediate 1 (pos)))))
(letk kinit
($kargs () ()
($continue kback src
($primcall 'scm-set! 'vector (v pos init)))))
(setk kloop
($kargs ('pos) (pos)
($branch kinit kdone src 'u64-< #f (usize pos))))
(letk kbody
($kargs () ()
($continue kloop src
($primcall 'load-u64 1 ()))))
(let$ init-loop
(emit-initializations-as-loop kdone src v 'vector 1 nwords init))
(letk kbody ($kargs () () ,init-loop))
(letk ktag2
($kargs ('w0) (w0)
($continue kbody src
@ -425,17 +431,32 @@
(define size param)
(define nwords (1+ size))
(define (init-fields cps v pos kdone)
(if (< pos nwords)
(with-cps cps
(let$ knext (init-fields v (1+ pos) kdone))
(letk kinit
($kargs () ()
($continue knext src
($primcall 'scm-set!/immediate `(vector . ,pos)
(v init)))))
kinit)
(with-cps cps
kdone)))
;; Inline the initializations, up to vectors of size 32. Above
;; that it's a bit of a waste, so reify a loop instead.
(cond
((<= 32 nwords)
(with-cps cps
(letv unwords)
(let$ init-loop
(emit-initializations-as-loop kdone src v 'vector
pos unwords init))
(letk kinit ($kargs ('unwords) (unwords) ,init-loop))
(letk kusize ($kargs () ()
($continue kinit src
($primcall 'load-u64 nwords ()))))
kusize))
((< pos nwords)
(with-cps cps
(let$ knext (init-fields v (1+ pos) kdone))
(letk kinit
($kargs () ()
($continue knext src
($primcall 'scm-set!/immediate `(vector . ,pos)
(v init)))))
kinit))
(else
(with-cps cps
kdone))))
(unless (and (exact-integer? size) (<= 0 size (target-max-vector-length)))
(error "precondition failed" size))
(with-cps cps