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Common numeric operations are left-to-right associative.

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* module/language/tree-il/primitives.scm (define-primitive-expander):
  Use 'match-lambda*' instead of 'case-lambda' for pattern matching.
  (*primitive-expand-table*): In primitive expanders for '+', '*', '-',
  '/', 'logior', and 'logand', assume conventional left-to-right
  associativity.
This commit is contained in:
Mark H Weaver 2013-08-12 19:40:32 -04:00
parent 73b98028f0
commit 71673fba93
1 changed files with 19 additions and 23 deletions
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42
module/language/tree-il/primitives.scm
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@ -20,6 +20,7 @@
(define-module (language tree-il primitives)
#:use-module (system base pmatch)
#:use-module (ice-9 match)
#:use-module (rnrs bytevectors)
#:use-module (system base syntax)
#:use-module (language tree-il)
@ -318,13 +319,14 @@
(else (error "bad consequent yall" exp))))
`(hashq-set! *primitive-expand-table*
',sym
(case-lambda
(match-lambda*
,@(let lp ((in clauses) (out '()))
(if (null? in)
(reverse (cons '(else #f) out))
(reverse (cons '(_ #f) out))
(lp (cddr in)
(cons `((src . ,(car in))
,(consequent (cadr in))) out)))))))
,(consequent (cadr in)))
out)))))))
(define-primitive-expander zero? (x)
(= x 0))
@ -334,50 +336,44 @@
(define-primitive-expander +
() 0
(x) (values x)
(x y) (if (and (const? y)
(let ((y (const-exp y)))
(and (number? y) (exact? y) (= y 1))))
(x y) (if (and (const? y) (eqv? (const-exp y) 1))
(1+ x)
(if (and (const? y)
(let ((y (const-exp y)))
(and (number? y) (exact? y) (= y -1))))
(if (and (const? y) (eqv? (const-exp y) -1))
(1- x)
(if (and (const? x)
(let ((x (const-exp x)))
(and (number? x) (exact? x) (= x 1))))
(if (and (const? x) (eqv? (const-exp x) 1))
(1+ y)
(+ x y))))
(x y z . rest) (+ x (+ y z . rest)))
(if (and (const? x) (eqv? (const-exp x) -1))
(1- y)
(+ x y)))))
(x y z ... last) (+ (+ x y . z) last))
(define-primitive-expander *
() 1
(x) (values x)
(x y z . rest) (* x (* y z . rest)))
(x y z ... last) (* (* x y . z) last))
(define-primitive-expander -
(x) (- 0 x)
(x y) (if (and (const? y)
(let ((y (const-exp y)))
(and (number? y) (exact? y) (= y 1))))
(x y) (if (and (const? y) (eqv? (const-exp y) 1))
(1- x)
(- x y))
(x y z . rest) (- x (+ y z . rest)))
(x y z ... last) (- (- x y . z) last))
(define-primitive-expander /
(x) (/ 1 x)
(x y z . rest) (/ x (* y z . rest)))
(x y z ... last) (/ (/ x y . z) last))
(define-primitive-expander logior
() 0
(x) (logior x 0)
(x y) (logior x y)
(x y z . rest) (logior x (logior y z . rest)))
(x y z ... last) (logior (logior x y . z) last))
(define-primitive-expander logand
() -1
(x) (logand x -1)
(x y) (logand x y)
(x y z . rest) (logand x (logand y z . rest)))
(x y z ... last) (logand (logand x y . z) last))
(define-primitive-expander caar (x) (car (car x)))
(define-primitive-expander cadr (x) (car (cdr x)))