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Be less aggressive about fixnum recommendations.

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Reduces false positives.
This commit is contained in:
Vincent St-Amour 2012-11-09 10:56:50 -05:00
parent 6d231da14f
commit ca47b1c693
1 changed files with 12 additions and 26 deletions
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38
collects/typed-racket/optimizer/fixnum.rkt
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@ -170,53 +170,39 @@
;; for fx-specific ops, we need to mimic the typing rules of their generic
;; counterparts, since fx-specific ops rely on error behavior for typechecking
;; and thus their return type cannot be used directly for optimization
;; Note: We don't log near misses for those, too many false positives.
;; If someone is using `fx+' in the first place, they should know about `unsafe-fx+'.
(pattern (#%plain-app (~and op (~literal fx+)) n1:fixnum-expr n2:fixnum-expr)
#:when (let ([safe-to-opt?
(or (and (subtypeof? #'n1 -Index) (subtypeof? #'n2 -Index))
(and (subtypeof? #'n1 -NonNegFixnum) (subtypeof? #'n2 -NonPosFixnum))
(and (subtypeof? #'n1 -NonPosFixnum) (subtypeof? #'n2 -NonNegFixnum)))])
(unless safe-to-opt?
(log-fixnum-missed-opt this-syntax))
safe-to-opt?)
#:when (or (and (subtypeof? #'n1 -Index) (subtypeof? #'n2 -Index))
(and (subtypeof? #'n1 -NonNegFixnum) (subtypeof? #'n2 -NonPosFixnum))
(and (subtypeof? #'n1 -NonPosFixnum) (subtypeof? #'n2 -NonNegFixnum)))
#:with opt
(begin (log-optimization "fixnum fx+" fixnum-opt-msg this-syntax)
(add-disappeared-use #'op)
#'(unsafe-fx+ n1.opt n2.opt)))
(pattern (#%plain-app (~and op (~literal fx-)) n1:fixnum-expr n2:fixnum-expr)
#:when (let ([safe-to-opt? (and (subtypeof? #'n1 -NonNegFixnum)
(subtypeof? #'n2 -NonNegFixnum))])
(unless safe-to-opt?
(log-fixnum-missed-opt this-syntax))
safe-to-opt?)
#:when (and (subtypeof? #'n1 -NonNegFixnum)
(subtypeof? #'n2 -NonNegFixnum))
#:with opt
(begin (log-optimization "fixnum fx-" fixnum-opt-msg this-syntax)
(add-disappeared-use #'op)
#'(unsafe-fx- n1.opt n2.opt)))
(pattern (#%plain-app (~and op (~literal fx*)) n1:fixnum-expr n2:fixnum-expr)
#:when (let ([safe-to-opt? (and (subtypeof? #'n1 -Byte)
(subtypeof? #'n2 -Byte))])
(unless safe-to-opt?
(log-fixnum-missed-opt this-syntax))
safe-to-opt?)
#:when (and (subtypeof? #'n1 -Byte)
(subtypeof? #'n2 -Byte))
#:with opt
(begin (log-optimization "fixnum fx*" fixnum-opt-msg this-syntax)
(add-disappeared-use #'op)
#'(unsafe-fx* n1.opt n2.opt)))
(pattern (#%plain-app (~and op (~literal fxquotient)) n1:fixnum-expr n2:fixnum-expr)
#:when (let ([safe-to-opt? (and (subtypeof? #'n1 -NonNegFixnum)
(subtypeof? #'n2 -Fixnum))])
(unless safe-to-opt?
(log-fixnum-missed-opt this-syntax))
safe-to-opt?)
#:when (and (subtypeof? #'n1 -NonNegFixnum)
(subtypeof? #'n2 -Fixnum))
#:with opt
(begin (log-optimization "fixnum fxquotient" fixnum-opt-msg this-syntax)
(add-disappeared-use #'op)
#'(unsafe-fxquotient n1.opt n2.opt)))
(pattern (#%plain-app (~and op (~or (~literal fxabs) (~literal abs))) n:fixnum-expr)
#:when (let ([safe-to-opt? (subtypeof? #'n -NonNegFixnum)]) ; (abs min-fixnum) is not a fixnum
(unless safe-to-opt?
(log-fixnum-missed-opt this-syntax))
safe-to-opt?)
#:when (subtypeof? #'n -NonNegFixnum)
#:with opt
(begin (log-optimization "fixnum fxabs" fixnum-opt-msg this-syntax)
(add-disappeared-use #'op)