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fibonacci.asm
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fibonacci.asm
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.int t 0
.!str reqstr Enter some number:
.int reqstrptr $reqstr
.int space 32
.str newline \n
.int one 1
.int two 2
.!int zero 0
.int minusone -1
.int minustwo -2
.int reg 0
# print_str(reqstr)
S 0 &t &t
S 0 &>ret &t
S 0 $sp $sp
S 0 &t $sp
S 0 &minusone &sp
S 0 &t &t
S 0 &reqstrptr &t
S 0 &t ® # reg = &reqstr
S 0 &>jump $zero
.int >jump @ - @print_str
.int >ret @
.str mindigit 0
.int ten 10
.int reg2 0
# read a number
@start2
S 0 ® ®
S 0 -1 ® # input -> reg
S 0 &t &t
S 0 ® &t
S 0 ®2 ®2
S 0 &t ®2 # reg2 = reg
S 0 &mindigit ® # if reg < '0' or reg > '9': goto start3
S $reg &>jump $zero
.int >jump @ - @continue2
S 0 &>jump $zero
.int >jump @ - @start3
@continue2
S 0 &ten ®
S $reg &>jump $zero
.int >jump @ - @start3
S 0 &mindigit ®2 # reg2 -= '0'
.int accum 0
.int reg3 0
S 0 ®3 ®3 # accum = 10 * accum + reg2
S 0 &accum ®3
S 0 &accum ®3
S 0 &accum ®3
S 0 &accum ®3
S 0 &accum ®3
S 0 &accum ®3
S 0 &accum ®3
S 0 &accum ®3
S 0 &accum ®3
S 0 &accum ®3
S 0 ®2 ®3
S 0 &accum &accum
S 0 ®3 &accum
S 0 &>jump $zero # goto start2
.int >jump @ - @start2
@start3
.!buf stack 300
.int sp $stack
.!str resstr Your fibonacci number is
.int resstrptr $resstr
# print_str(resstr)
S 0 &t &t
S 0 &>ret &t
S 0 $sp $sp
S 0 &t $sp
S 0 &minusone &sp
S 0 &t &t
S 0 ® ®
S 0 &resstrptr &t
S 0 &t ® # reg = &resstr
S 0 &>jump $zero
.int >jump @ - @print_str
.int >ret @
# fib(accum)
S 0 &t &t
S 0 &>ret &t
S 0 $sp $sp
S 0 &t $sp
S 0 &minusone &sp
S 0 &t &t
S 0 &accum &t
S 0 ® ®
S 0 &t ® # reg = accum
S 0 &>jump $zero
.int >jump @ - @fib
.int >ret @
# print_int(reg)
S 0 &t &t
S 0 &>ret &t
S 0 $sp $sp
S 0 &t $sp
S 0 &minusone &sp
S 0 &t &t
S 0 ® &t
S 0 &var_a &var_a
S 0 &t &var_a # var_a = reg
S 0 &>jump $zero
.int >jump @ - @print_int
.int >ret @
# output <- \n
S 0 &newline -1
# exit
S 0 &>halt $zero
.int >halt @ - -1
@fib
#push reg
S 0 &t &t
S 0 ® &t
S 0 $sp $sp
S 0 &t $sp
S 0 &minusone &sp
# if reg -= 2 <= 1: return 1
S 0 &two ®
S $reg &>jump $zero
.int >jump @ - @fib_go
S 0 ® ®
S 0 &minusone ®
S 0 &two &sp
S 0 &t &t
S 0 &>jump &t
S 0 $sp &t
S 0 &t $zero
.int >jump 0 - @
@fib_go
# fib(reg += 1)
S 0 &minusone ®
S 0 &t &t
S 0 &>ret &t
S 0 $sp $sp
S 0 &t $sp
S 0 &minusone &sp
S 0 &>jump $zero
.int >jump @ - @fib
.int >ret @
# push reg
S 0 &t &t
S 0 ® &t
S 0 $sp $sp
S 0 &t $sp
# reg = *(sp - 2) - 2
S 0 &one &sp
S 0 &t &t
S 0 $sp &t
S 0 ® ®
S 0 &t ®
S 0 &two ®
S 0 &minustwo &sp
# fib(reg)
S 0 &t &t
S 0 &>ret &t
S 0 $sp $sp
S 0 &t $sp
S 0 &minusone &sp
S 0 &>jump $zero
.int >jump @ - @fib
.int >ret @
# reg += *(sp - 1)
S 0 &one &sp
S 0 ®2 ®2
S 0 $sp ®2
S 0 ®2 ®
# return
S 0 &two &sp
S 0 &t &t
S 0 &>jump &t
S 0 $sp &t
S 0 &t $zero
.int >jump 0 - @
.int var_a 0
.int var_k 1
@print_int #(a, k), k = 10^i
# push k
S 0 &t &t
S 0 &var_k &t
S 0 $sp $sp
S 0 &t $sp
S 0 &minusone &sp
# if a - k < 0: goto print_int_ret
S 0 &t &t
S 0 &var_a &t
S 0 ® ®
S 0 &t ®
S 0 &var_k ®
S $reg &>jump $zero
.int >jump @ - @print_int_cont
S 0 &>jump $zero
.int >jump @ - @print_int_ret
@print_int_cont
# k *= 10
S 0 ® ®
S 0 &var_k ®
S 0 &var_k ®
S 0 &var_k ®
S 0 &var_k ®
S 0 &var_k ®
S 0 &var_k ®
S 0 &var_k ®
S 0 &var_k ®
S 0 &var_k ®
S 0 &var_k ®
S 0 &var_k &var_k
S 0 ® &var_k
# print_int(a, k)
S 0 &t &t
S 0 &>ret &t
S 0 $sp $sp
S 0 &t $sp
S 0 &minusone &sp
S 0 &>jump $zero
.int >jump @ - @print_int
.int >ret @
# k = *(sp - 1)
S 0 &one &sp
S 0 &t &t
S 0 $sp &t
S 0 &var_k &var_k
S 0 &t &var_k
S 0 &minusone &sp
.int var_c 0
# while a >= 0: a -= k, c += 1
S 0 &var_c &var_c
@print_int_startloop
S 0 &one &var_c
S 0 &var_k &var_a
S $var_a &>jump $zero
.int >jump @ - @print_int_startloop
# a += k
S 0 ® ®
S 0 &var_k ®
S 0 ® &var_a
# output <- c + mindigit - 1
S 0 &t &t
S 0 ®2 ®2
S 0 &mindigit &t
S 0 &t ®2
S 0 &var_c ®2
S 0 &one ®2
S 0 ®2 -1
@print_int_ret
S 0 &two &sp
S 0 &t &t
S 0 &>jump &t
S 0 $sp &t
S 0 &t $zero
.int >jump 0 - @
@print_str #(reg)
# reg2 = *reg - 1
S 0 &t &t
S 0 ®2 ®2
S 0 $reg &t
S 0 &t ®2
S 0 &one ®2
# if reg2 < 0: output <- ' ', return
S $reg2 &>jump $zero
.int >jump @ - @print_str_cont
S 0 &space -1
S 0 &one &sp
S 0 &t &t
S 0 &>jump &t
S 0 $sp &t
S 0 &t $zero
.int >jump 0 - @
@print_str_cont
# output <- reg2 + 1
S 0 &minusone ®2
S 0 ®2 -1
# reg += 1, tail call
S 0 &minusone ®
S 0 &>jump $zero
.int >jump @ - @print_str