SICP演習問題5.34
factorialの反復的プロセス版を翻訳する
(print-after-compiler (compile '(define (factorial n) (define (iter product counter) (if (> counter n) product (iter (* counter product) (+ counter 1)))) (iter 1 1)) 'val 'next))
結果
(env) (val) (assign val (op make-compiled-procedure) (label entry1) (reg env)) (goto (label after-lambda2)) entry1 (assign env (op compiled-procedure-env) (reg proc)) (assign env (op extend-environment) (const (n)) (reg argl) (reg env)) (assign val (op make-compiled-procedure) (label entry3) (reg env)) (goto (label after-lambda4)) entry3 (assign env (op compiled-procedure-env) (reg proc)) (assign env (op extend-environment) (const (product counter)) (reg argl) (reg env)) (save continue) (save env) (assign proc (op lookup-variable-value) (const >) (reg env)) (assign val (op lookup-variable-value) (const n) (reg env)) (assign argl (op list) (reg val)) (assign val (op lookup-variable-value) (const counter) (reg env)) (assign argl (op cons) (reg val) (reg argl)) (test (op primitive-procedure?) (reg proc)) (branch (label primitive-branch8)) compiled-branch9 (assign continue (label after-call10)) (assign val (op compiled-procedure-entry) (reg proc)) (goto (reg val)) primitive-branch8 (assign val (op apply-primitive-procedure) (reg proc) (reg argl)) after-call10 (restore env) (restore continue) (test (op false?) (reg val)) (branch (label false-branch6)) true-branch5 (assign val (op lookup-variable-value) (const product) (reg env)) (goto (reg continue)) false-branch6 (assign proc (op lookup-variable-value) (const iter) (reg env)) (save continue) (save proc) (save env) (assign proc (op lookup-variable-value) (const +) (reg env)) (assign val (const 1)) (assign argl (op list) (reg val)) (assign val (op lookup-variable-value) (const counter) (reg env)) (assign argl (op cons) (reg val) (reg argl)) (test (op primitive-procedure?) (reg proc)) (branch (label primitive-branch14)) compiled-branch15 (assign continue (label after-call16)) (assign val (op compiled-procedure-entry) (reg proc)) (goto (reg val)) primitive-branch14 (assign val (op apply-primitive-procedure) (reg proc) (reg argl)) after-call16 (assign argl (op list) (reg val)) (restore env) (save argl) (assign proc (op lookup-variable-value) (const *) (reg env)) (assign val (op lookup-variable-value) (const product) (reg env)) (assign argl (op list) (reg val)) (assign val (op lookup-variable-value) (const counter) (reg env)) (assign argl (op cons) (reg val) (reg argl)) (test (op primitive-procedure?) (reg proc)) (branch (label primitive-branch11)) compiled-branch12 (assign continue (label after-call13)) (assign val (op compiled-procedure-entry) (reg proc)) (goto (reg val)) primitive-branch11 (assign val (op apply-primitive-procedure) (reg proc) (reg argl)) after-call13 (restore argl) (assign argl (op cons) (reg val) (reg argl)) (restore proc) (restore continue) (test (op primitive-procedure?) (reg proc)) (branch (label primitive-branch17)) compiled-branch18 (assign val (op compiled-procedure-entry) (reg proc)) (goto (reg val)) primitive-branch17 (assign val (op apply-primitive-procedure) (reg proc) (reg argl)) (goto (reg continue)) after-call19 after-if7 after-lambda4 (perform (op define-variable!) (const iter) (reg val) (reg env)) (assign val (const ok)) (assign proc (op lookup-variable-value) (const iter) (reg env)) (assign val (const 1)) (assign argl (op list) (reg val)) (assign val (const 1)) (assign argl (op cons) (reg val) (reg argl)) (test (op primitive-procedure?) (reg proc)) (branch (label primitive-branch20)) compiled-branch21 (assign val (op compiled-procedure-entry) (reg proc)) (goto (reg val)) primitive-branch20 (assign val (op apply-primitive-procedure) (reg proc) (reg argl)) (goto (reg continue)) after-call22 after-lambda2 (perform (op define-variable!) (const factorial) (reg val) (reg env)) (assign val (const ok)) #<undef>