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Convert branchable primitives into binary operations only.

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* module/language/tree-il/primitives.scm (maybe-simplify-to-eq): Wrap
  within another lambda, binding the primitive name.  If there are less
  than two arguments, expand to constant #t.  If there are more than two
  arguments, convert into a conjunction of binary applications.
  (expand-chained-comparisons): New procedure.
  (*primitive-expand-table*): Add entries for (< <= = >= > eq?).
This commit is contained in:
Mark H Weaver 2013-08-13 09:03:23 -04:00 • committed by Andy Wingo
parent 453acfacf4
commit 62d3430cb6
1 changed files with 25 additions and 3 deletions
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28
module/language/tree-il/primitives.scm
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@ -509,8 +509,10 @@
(bytevector-ieee-double-native-set! vec (* i 8) x))
;; Appropriate for use with either 'eqv?' or 'equal?'.
(define maybe-simplify-to-eq
(define (maybe-simplify-to-eq prim)
(case-lambda
((src) (make-const src #t))
((src a) (make-const src #t))
((src a b)
;; Simplify cases where either A or B is constant.
(define (maybe-simplify a b)
@ -524,10 +526,30 @@
(>= v most-negative-fixnum)))
(make-primcall src 'eq? (list a b))))))
(or (maybe-simplify a b) (maybe-simplify b a)))
((src a b . rest)
(make-conditional src (make-primcall src prim (list a b))
(make-primcall src prim (cons b rest))
(make-const src #f)))
(else #f)))
(hashq-set! *primitive-expand-table* 'eqv? maybe-simplify-to-eq)
(hashq-set! *primitive-expand-table* 'equal? maybe-simplify-to-eq)
(hashq-set! *primitive-expand-table* 'eqv? (maybe-simplify-to-eq 'eqv?))
(hashq-set! *primitive-expand-table* 'equal? (maybe-simplify-to-eq 'equal?))
(define (expand-chained-comparisons prim)
(case-lambda
((src) (make-const src #t))
((src a) (make-const src #t))
((src a b) #f)
((src a b . rest)
(make-conditional src (make-primcall src prim (list a b))
(make-primcall src prim (cons b rest))
(make-const src #f)))
(else #f)))
(for-each (lambda (prim)
(hashq-set! *primitive-expand-table* prim
(expand-chained-comparisons prim)))
'(< <= = >= > eq?))
(hashq-set! *primitive-expand-table*
'call-with-prompt