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Revert "Recommend turning "hot" higher-order calls into first-order calls."

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This reverts commit bb0c20ce6eff2112a25eb1f98d394b36da0128f8.

Was never useful in practice.
This commit is contained in:
Vincent St-Amour 2012-11-28 12:44:24 -05:00
parent 89948b2954
commit 48a55f7e74
1 changed files with 0 additions and 41 deletions
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41
collects/typed-racket/optimizer/tool/mzc.rkt
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@ -298,47 +298,6 @@
(format "Inlining ~a" (format-aggregation-string pruned-log))
stx located-stx pos provenance)))
;; This function has an interesting caller, but no trace of inlining
;; attempts in it, which means it probably gets there via a higher-order
;; call. Recommend performing a devirtualization-like transformation to
;; turn the call into a first-order one.
;; Limitation: to even get to this point in the optimization analysis
;; process, the callee needs to have inlining attempts somewhere,
;; otherwise it won't be visited when traversing the inlining logs.
;; Solution: record this pattern when traversing the progiling logs.
(when profile-entry
(for ([caller+site (in-list interesting-callers+sites)]
#:when (null? (cdr caller+site)))
(define caller (car caller+site))
(define caller-pos (list (node-source caller)
(node-line caller)
(node-col caller)
(node-pos caller)
(node-span caller)))
(define forged-stx
(datum->syntax #'here (node-id caller) caller-pos))
(define callee-id (node-id profile-entry))
(emit (missed-opt-log-entry
kind
(string-append
(format "This function spends a lot of time in ~a (~a:~a) "
callee-id
(node-line profile-entry)
(node-col profile-entry))
"but gets there via a higher-order call, preventing inlining.\n\n"
"Using a conditional direct call would enable further optimization.\n\n"
"For example, assuming funarg is the higher-order callee:\n"
(format " (if (eq? funarg ~a) (~a ...) (funarg ...))\n"
callee-id callee-id))
;; TODO maybe report only if the function would be small
;; enough to be inlined (fuel), but we don't have size
;; info for callee
forged-stx forged-stx (node-pos caller) provenance
'() '()
20)))) ; TODO actual badness
(define inside-hot-function?
(and profile (memq profile-entry hot-functions)))