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[Chicken-janitors] #1604: fixnum arithmetic is ignored

From: Chicken Trac
Subject: [Chicken-janitors] #1604: fixnum arithmetic is ignored
Date: Wed, 10 Apr 2019 08:52:32 -0000

#1604: fixnum arithmetic is ignored
 Reporter:  sjamaan   |                 Owner:
     Type:  defect    |                Status:  new
 Priority:  major     |             Milestone:  5.1
Component:  compiler  |               Version:  5.0.0
 Keywords:            |  Estimated difficulty:  medium
 As reported by chickendan on IRC:

 ;; csc -O5 -strict-types -fixnum-arithmetic: 7.964s
 ;; csc -O5 -strict-types:                    8.105s
 ;; csc -O5 -strict-types (and fx functions): 0.246s
 ;;; c/nim -O3 baseline:                       0.211s

 (define (fib n)
   (if (or (= n 0) (= n 1))
       (+ (fib (- n 1)) (fib (- n 2)))))

 (let loop ((n 0))
   (when (< n 35)
     (print "n=" n " => " (fib n))
     (loop (+ n 1))))

 This program should use fixnum ops when declaring fixnum arithmetic.
 Also, when wrapping `fib`'s body in an `assume`, it still compiles to
 `C_s_a_i_plus` calls rather than `C_a_i_fixnum_plus` or even just

 I think we should take a look before releasing 5.1, the fact `fixnum-
 arithmetic` is ignored may not be a big issue, but it is rather worrying
 that the specializations aren't used.

Ticket URL: <>
CHICKEN Scheme <>
CHICKEN Scheme is a compiler for the Scheme programming language.

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