在linux上运行的我的nasbit 64位代码试图使用horners方法在21x41网格上打印出余弦波。但是，每当我打印所有我得到的是一个空的21x41网格。任何人都可以帮我解决这个问题吗？我的代码如下：
SECTION .data ; Data section, initialized variables
nrow: dq 21 ; 21 rows
ncol: dq 41 ; 41 columns
fmtc: db "%c", 0 ; print one character at a time
fmtend: db 10, 0 ; end a line
fmtdbg: db "i=%ld, j=%ld, k=%ld", 10, 0
star: db '*' ; one character '*'
len: equ $-star
spc: db ' '
af: dq 1.0, 0.0, -0.5 ; coefficients of polynomial, a_0 first
dq 0.0, 0.041667, 0.0, -0.001389, 0.0, 0.000025
XF: dq 0.0 ; computed
Y: dq 0.0 ; computed
N: dq 8 ; power of polynomial
X0: dq -3.14159 ; start XF
DX0: dq 0.15708 ; increment for XF ncol-1 times
one: dq 1.0
ten: dq 10.0
none: dq -1.0
nten: dq -10.0
twenty: dq 20.0
zero: dq 0.0
newline: db 10
section .bss
a2: resb 21*41 ; two dimensional array of bytes
i: resq 1 ; row subscript
j: resq 1 ; col subscript
k: resq 1
SECTION .text ; Code section.
global _start ; the standard gcc entry point
_start: ; the program label for the entry point
;; clear a2 to space
mov rax,0 ; i=0
mov [i],rax
loopi:
mov rax,[i]
mov rbx,0 ; j=0
mov [j],rbx
loopj:
mov rax,[i]
mov rbx,[j]
imul rax,[ncol] ; i*ncol
add rax, rbx ; i*ncol + j
mov dl, [spc] ; need just character, byte
mov [a2+rax],dl ; store space
mov rbx,[j]
inc rbx ; j++
mov [j],rbx
cmp rbx,[ncol] ; j<ncol
jne loopj
mov rax,[i]
inc rax ; i++
mov [i],rax
cmp rax,[nrow] ; i<ncol
jne loopi
;; end clear a2 to space
mov rax, 0 ;i = 0
mov [i], rax
mov rbx, 0 ;j = 0
mov [j], rbx
cos:
mov rcx,[N] ; loop iteration count initialization, n
fld qword [af+8*rcx] ; accumulate value here, get coefficient a_
h5loop:
fmul qword [XF] ; * XF
fadd qword [af+8*rcx-8] ; + aa_n-i
loop h5loop ; decrement rcx, jump on non zero
fstp qword [Y] ; store Y
;;; ; compute k
fld qword [Y]
fadd qword [one]
fmul qword [ten]
fmul qword [none]
fadd qword [twenty]
fistp qword [k]
;;; ; ; ; rax gets k * ncol + j
mov rax, [k]
mov rbx, [j]
imul rax, [ncol]
add rax, rbx
;;; ; put "*" in dl, then dl into [a2+rax]
mov dl, [star]
mov [a2+rax], dl
;;; ; XF = XF + DX0
fld qword [XF]
fadd qword [DX0]
fistp qword [XF]
mov rbx, [j]
inc rbx ; j++
mov [j], rbx
cmp rbx,[ncol] ; j<ncol
jl cos
;; print
mov rax,0 ; i=0
mov [i],rax
ploopi:
mov rax,[i]
mov rbx,0 ; j=0
mov [j],rbx
ploopj:
mov rax,[i]
mov rbx,[j]
;add rax, a2
mov dl, [spc]
;; compute double subscript
imul rax,[ncol]
add rax, rbx
;; mov rdi, fmtc
mov rsi, [a2+rax]
mov rax, 1
mov rdi, 1 ; file handle 1 is stdout
mov rsi, [a2+rax] ;or star for 21x41 stars
mov rdx, 1 ; number of bytes
syscall
;; print here
mov rbx,[j]
inc rbx ; j++
mov [j],rbx
cmp rbx,[ncol] ; j<ncol
jne ploopj
mov rdi, fmtend
mov rax, 1
mov rdi, 1 ; file handle 1 is stdout
mov rsi, newline ; address of string to output
mov rdx, 1 ; number of bytes
syscall
;; print here
mov rax,[i]
inc rax ; i++
mov [i],rax
cmp rax,[nrow] ; i<ncol
jne ploopi
;; print a2
mov eax, 60 ; system call 60 is exit
xor rdi, rdi ; exit code 0
syscall ; invoke operating system to exit
很抱歉，如果我的代码很乱。我是汇编语言的新手。谢谢你的帮助：）