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xform: more precise tracking of non-gcing calls, which helps avoid conversions of whole functions

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svn: r4254
This commit is contained in:
Matthew Flatt 2006-09-06 04:21:33 +00:00
parent 1a2eea24ad
commit 213fe7c52b
1 changed files with 55 additions and 47 deletions
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102
collects/compiler/private/xform.ss
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@ -3289,53 +3289,61 @@
(and (not non-returning?)
(or (pair? pushed-vars)
(live-var-info-nonempty-calls? live-vars)))])
(loop rest-
(let ([call (if (and (null? (cdr func))
(hash-table-get non-gcing-functions (tok-n (car func)) (lambda () #f)))
;; Call without pointer pushes
(make-parens
"(" #f #f ")"
(list->seq (append func (list args))))
;; Call with pointer pushes
(begin
(set! saw-gcing-call (car e-))
(make-call
"func call"
#f #f
func
args
pushed-vars
(live-var-info-tag orig-live-vars)
this-nonempty?)))])
(cons (if (null? setups)
call
(make-callstage-parens
"(" #f #f ")"
(list->seq
(append
(apply append setups)
(list call)))))
result))
(make-live-var-info (live-var-info-tag live-vars)
;; maxlive is either size for this push or old maxlive:
(max (total-push-size (live-var-info-vars orig-live-vars))
(live-var-info-maxlive live-vars))
;; note: maxpush calculated at block level
(live-var-info-maxpush live-vars)
(live-var-info-vars live-vars)
(live-var-info-new-vars live-vars)
;; Add newly-pushed variable to pushed set:
(let* ([old-pushed (live-var-info-pushed-vars live-vars)]
[new-pushed (filter (lambda (x) (not (assq (car x) old-pushed))) pushed-vars)])
(append new-pushed old-pushed))
(add1 (live-var-info-num-calls live-vars))
(+ (if non-returning? 1 0)
(live-var-info-num-noreturn-calls live-vars))
(or this-nonempty?
(live-var-info-nonempty-calls? live-vars)))
(or converted-sub?
(null? rest-)
(not (memq (tok-n (car rest-)) '(return else))))))))))]
(let ([non-gcing-call?
(and (null? (cdr func))
(hash-table-get non-gcing-functions (tok-n (car func)) (lambda () #f)))])
(loop rest-
(let ([call (if non-gcing-call?
;; Call without pointer pushes
(make-parens
"(" #f #f ")"
(list->seq (append func (list args))))
;; Call with pointer pushes
(begin
(set! saw-gcing-call (car e-))
(make-call
"func call"
#f #f
func
args
pushed-vars
(live-var-info-tag orig-live-vars)
this-nonempty?)))])
(cons (if (null? setups)
call
(make-callstage-parens
"(" #f #f ")"
(list->seq
(append
(apply append setups)
(list call)))))
result))
(make-live-var-info (live-var-info-tag live-vars)
;; maxlive is either size for this push or old maxlive:
(max (if non-gcing-call?
0
(total-push-size (live-var-info-vars orig-live-vars)))
(live-var-info-maxlive live-vars))
;; note: maxpush calculated at block level
(live-var-info-maxpush live-vars)
(live-var-info-vars live-vars)
(live-var-info-new-vars live-vars)
;; Add newly-pushed variable to pushed set:
(let* ([old-pushed (live-var-info-pushed-vars live-vars)]
[new-pushed (if non-gcing-call?
null
(filter (lambda (x) (not (assq (car x) old-pushed)))
pushed-vars))])
(append new-pushed old-pushed))
(+ (if non-gcing-call? 0 1)
(live-var-info-num-calls live-vars))
(+ (if non-returning? 1 0)
(live-var-info-num-noreturn-calls live-vars))
(or (and this-nonempty? (not non-gcing-call?))
(live-var-info-nonempty-calls? live-vars)))
(or converted-sub?
(null? rest-)
(not (memq (tok-n (car rest-)) '(return else)))))))))))]
[(eq? 'goto (tok-n (car e-)))
;; Goto - assume all vars are live
(loop (cdr e-) (cons (car e-) result)