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Optimize closures with only required and rest arguments in eval

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* module/ice-9/eval.scm: Pregenerate closures with rest arguments, as we
  do for fixed arguments.  This is important given the amount of (lambda
  args (apply foo args)) that we are doing lately.
This commit is contained in:
Andy Wingo 2013-10-23 19:01:03 +02:00
parent 8695854a7d
commit a4b64fa246
1 changed files with 45 additions and 6 deletions
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49
module/ice-9/eval.scm
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@ -102,6 +102,46 @@
(1- nreq)
(cdr args)))))))))))))
;; Fast case for procedures with fixed arities and a rest argument.
(define-syntax make-rest-closure
(lambda (x)
(define *max-static-argument-count* 3)
(define (make-formals n)
(map (lambda (i)
(datum->syntax
x
(string->symbol
(string (integer->char (+ (char->integer #\a) i))))))
(iota n)))
(syntax-case x ()
((_ eval nreq body env) (not (identifier? #'env))
#'(let ((e env))
(make-rest-closure eval nreq body e)))
((_ eval nreq body env)
#`(case nreq
#,@(map (lambda (nreq)
(let ((formals (make-formals nreq)))
#`((#,nreq)
(lambda (#,@formals . rest)
(eval body
(cons* rest #,@(reverse formals) env))))))
(iota *max-static-argument-count*))
(else
#,(let ((formals (make-formals *max-static-argument-count*)))
#`(lambda (#,@formals . more)
(let lp ((new-env (cons* #,@(reverse formals) env))
(nreq (- nreq #,*max-static-argument-count*))
(args more))
(if (zero? nreq)
(eval body (cons args new-env))
(if (null? args)
(scm-error 'wrong-number-of-args
"eval" "Wrong number of arguments"
'() #f)
(lp (cons (car args) new-env)
(1- nreq)
(cdr args)))))))))))))
(define-syntax call
(lambda (x)
(define *max-static-call-count* 4)
@ -212,8 +252,9 @@
(define primitive-eval
(let ()
;; We pre-generate procedures with fixed arities, up to some number of
;; arguments; see make-fixed-closure above.
;; We pre-generate procedures with fixed arities, up to some number
;; of arguments, and some rest arities; see make-fixed-closure and
;; make-rest-closure above.
;; A unique marker for unbound keywords.
(define unbound-arg (list 'unbound-arg))
@ -413,9 +454,7 @@
(if (null? tail)
(make-fixed-closure eval nreq body (capture-env env))
(if (null? (cdr tail))
(make-general-closure (capture-env env) body
nreq (car tail)
0 #f '() #f)
(make-rest-closure eval nreq body (capture-env env))
(apply make-general-closure (capture-env env)
body nreq tail)))))
(when docstring