无法找到最长递减序列的负数

Question

我用C写了一个汇编代码，只有数组中的数字是正数才有效。如果我想测试任何负数，它会跳过数字。

这是我的汇编代码：

INCLUDE Irvine32.inc

.data

; LSD
bestIndex dword 0
bestLen dword 0
curIndex dword 0
curLen dword 1
i dword 1
strLSD byte "Longest Decreasing Sequence: ", 0
strBestIndex byte "Begins at index ", 0
strBestLen byte " and has a length of ", 0

.code

findLDS proc C arr:sdword, len:dword
;arr - array passed from C
;len is the length of the array

mov ecx, len
mov esi, arr
add esi, type arr

compare:
    .IF i <= ecx
    jmp cont
    .ELSE
    jmp ex
    .ENDIF

cont:
    mov eax, dword ptr [esi - type arr]
    .IF dword ptr [esi] <= eax
    jmp incCurLen
    .ELSE
    jmp setCurLen
    .ENDIF

incCurLen:
    inc curLen
    jmp compareCurLen

setCurLen:
    mov curLen, 1
    mov eax, i
    mov curIndex, eax
    jmp compareCurLen

compareCurLen:
    mov eax, bestLen
    .IF curLen > eax
    jmp changeBest
    .ELSE
    jmp incI
    .ENDIF

changeBest:
    mov eax, curIndex
    mov bestIndex, eax
    mov eax, curLen
    mov bestLen, eax
    jmp incI

incI:
    inc i
    add esi, type arr
    jmp compare

ex:
    ; when our loop ends, print the sequence
    mov ecx, bestLen
    mov ebx, bestIndex
    mov edx, offset strLSD
    call writestring

    L1:
        push ecx
        mov esi, arr
        mov eax, dword ptr [esi + type arr*ebx]
        call writeint
        mov al, ','
        call writechar
        mov al, ' '
        call writechar
        inc ebx
        pop ecx
        loop l1

call crlf
mov edx, offset strBestIndex
call writestring
mov eax, bestIndex
call writedec

mov edx, offset strBestLen
call writeString
mov eax, bestLen
call writedec

call crlf
ret
findLDS endp

END

这是我的 C 代码：

int main()
{

int arr[] = { -5, 10, 20, 80, 73, 32, 20, 22, 19, -5 };
int len = (sizeof(arr) / sizeof(*arr));
findLDS(arr, len);

return 0;
}

此数组的输出：

最长递减序列：+80、+73、+32、+20。从索引 3 开始，长度为 4

这是正确的，但是如果我将数组的 20（索引 6）更改为 -20，我的输出是

最长递减序列：+80、+73、+32。从索引 3 开始，长度为 3

Answer 1

按照@Jester 的建议，我将其更改为已签名的 cmp 并且有效。

代码：

cont:
    mov eax, dword ptr [esi - type arr]
    cmp dword ptr [esi], eax
    jle incCurLen
    jmp setCurLen

无法找到最长递减序列的负数

Unable to find negative numbers for Longest Decreasing Sequence

assembly

irvine32