mbutterick
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aoc-racket
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touchup

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master
Matthew Butterick 4 years ago
parent 481f436ff1
commit c7e5a4810e
1 changed files with 12 additions and 14 deletions
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26
2019/09.rkt
Unescape Escape View File

@ -9,9 +9,9 @@
(define (make-runner program [calling-thd (current-thread)])
(thread (λ ()
(define regs (string->regs program))
(define (maybe-enlarge-regs len)
(unless (< len (vector-length regs))
(define newvec (make-vector (add1 len) 0))
(define (maybe-enlarge-regs ptr)
(unless (< ptr (vector-length regs))
(define newvec (make-vector (add1 ptr) 0))
(vector-copy! newvec 0 regs)
(set! regs newvec))
regs)
@ -21,19 +21,19 @@
(let/ec terminate
(let loop ([ptr 0])
(define inst (for/list ([c (in-string (~r (reg-ref ptr) #:min-width 5 #:pad-string "0"))])
(string->number (string c))))
(string->number (string c))))
(match-define (list opcode mode-1 mode-2 mode-3)
(match inst
[(list d4 d3 d2 d1 d0)
(cons (+ (* 10 d1) d0)
(for/list ([mode-val (list d2 d3 d4)]
[offset '(1 2 3)])
(λ (ptr)
(define ptr-adjusted (+ ptr offset))
(match mode-val
[0 (reg-ref ptr-adjusted)] ; position
[1 ptr-adjusted] ; immediate
[2 (+ relative-base (reg-ref ptr-adjusted))]))))])) ; relative
(λ (ptr)
(define ptr-adjusted (+ ptr offset))
(match mode-val
[0 (reg-ref ptr-adjusted)] ; position
[1 ptr-adjusted] ; immediate
[2 (+ relative-base (reg-ref ptr-adjusted))]))))])) ; relative
(define next-ptr
(match opcode
[(or 1 2 7 8) ; 4-arity: add & multiply & compare
@ -64,10 +64,8 @@
(define thd (match program-or-thread
[(? thread? thd) thd]
[program (make-runner program)]))
(let loop ([acc null])
(match (thread-receive)
['done (reverse acc)]
[msg (loop (cons msg acc))])))
(for/list ([val (in-producer thread-receive 'done)])
val))
(check-equal?