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reorder eval clauses

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* module/ice-9/eval.scm: Add a comment explaining the frequencies of the
  various memoized expression types.
  (eval): Reorder the cases based the profile.
This commit is contained in:
Andy Wingo 2010-02-18 16:59:41 +01:00
parent d69531e213
commit 21ec0bd907
1 changed files with 87 additions and 59 deletions
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126
module/ice-9/eval.scm
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@ -188,24 +188,66 @@
(mx-match mx data tag c ...)))))))
;;;
;;; On 18 Feb 2010, I did a profile of how often the various memoized expression
;;; types occur when getting to a prompt on a fresh build. Here are the numbers
;;; I got:
;;;
;;; lexical-ref: 32933054
;;; call: 20281547
;;; toplevel-ref: 13228724
;;; if: 9156156
;;; quote: 6610137
;;; let: 2619707
;;; lambda: 1010921
;;; begin: 948945
;;; lexical-set: 509862
;;; call-with-values: 139668
;;; apply: 49402
;;; module-ref: 14468
;;; define: 1259
;;; toplevel-set: 328
;;; dynwind: 162
;;; with-fluids: 0
;;; call/cc: 0
;;; module-set: 0
;;;
;;; So until we compile `case' into a computed goto, we'll order the clauses in
;;; `eval' in this order, to put the most frequent cases first.
;;;
(define primitive-eval
(let ()
;; The "engine". EXP is a memoized expression.
(define (eval exp env)
(memoized-expression-case exp
(('begin (first . rest))
(let lp ((first first) (rest rest))
(if (null? rest)
(eval first env)
(begin
(eval first env)
(lp (car rest) (cdr rest))))))
(('lexical-ref n)
(let lp ((n n) (env env))
(if (zero? n)
(car env)
(lp (1- n) (cdr env)))))
(('call (f nargs . args))
(let ((proc (eval f env)))
(call eval proc nargs args env)))
(('toplevel-ref var-or-sym)
(variable-ref
(if (variable? var-or-sym)
var-or-sym
(let lp ((env env))
(if (pair? env)
(lp (cdr env))
(memoize-variable-access! exp (capture-env env)))))))
(('if (test consequent . alternate))
(if (eval test env)
(eval consequent env)
(eval alternate env)))
(('quote x)
x)
(('let (inits . body))
(let lp ((inits inits) (new-env (capture-env env)))
(if (null? inits)
@ -216,36 +258,13 @@
(('lambda (nreq rest? . body))
(make-closure eval nreq rest? body (capture-env env)))
(('quote x)
x)
(('define (name . x))
(define! name (eval x env)))
(('dynwind (in exp . out))
(dynamic-wind (eval in env)
(lambda () (eval exp env))
(eval out env)))
(('apply (f args))
(apply (eval f env) (eval args env)))
(('call (f nargs . args))
(let ((proc (eval f env)))
(call eval proc nargs args env)))
(('call/cc proc)
(call/cc (eval proc env)))
(('call-with-values (producer . consumer))
(call-with-values (eval producer env)
(eval consumer env)))
(('lexical-ref n)
(let lp ((n n) (env env))
(if (zero? n)
(car env)
(lp (1- n) (cdr env)))))
(('begin (first . rest))
(let lp ((first first) (rest rest))
(if (null? rest)
(eval first env)
(begin
(eval first env)
(lp (car rest) (cdr rest))))))
(('lexical-set! (n . x))
(let ((val (eval x env)))
@ -254,14 +273,21 @@
(set-car! env val)
(lp (1- n) (cdr env))))))
(('toplevel-ref var-or-sym)
(('call-with-values (producer . consumer))
(call-with-values (eval producer env)
(eval consumer env)))
(('apply (f args))
(apply (eval f env) (eval args env)))
(('module-ref var-or-spec)
(variable-ref
(if (variable? var-or-sym)
var-or-sym
(let lp ((env env))
(if (pair? env)
(lp (cdr env))
(memoize-variable-access! exp (capture-env env)))))))
(if (variable? var-or-spec)
var-or-spec
(memoize-variable-access! exp #f))))
(('define (name . x))
(define! name (eval x env)))
(('toplevel-set! (var-or-sym . x))
(variable-set!
@ -273,11 +299,13 @@
(memoize-variable-access! exp (capture-env env)))))
(eval x env)))
(('module-ref var-or-spec)
(variable-ref
(if (variable? var-or-spec)
var-or-spec
(memoize-variable-access! exp #f))))
(('dynwind (in exp . out))
(dynamic-wind (eval in env)
(lambda () (eval exp env))
(eval out env)))
(('call/cc proc)
(call/cc (eval proc env)))
(('module-set! (x . var-or-spec))
(variable-set!