Question

由于FPU Stack只有8个插槽，我该如何添加更多元素。我有一个10个元素的数组，我需要添加。这是我到目前为止所拥有的

_Average proc

        finit

        mov ecx, [esp + 4]      ; get the number of elements
        mov ebx, [esp + 8]      ; get the address of the array

        fld     REAL8 PTR [ebx]     ; get first element of array
        fld     REAL8 PTR [ebx + 8] ; get second element of array
        fld     REAL8 PTR [ebx + 16]; this element is now at the top of the stack
        fld     REAL8 PTR [ebx + 24]
        fld     REAL8 PTR [ebx + 32]
        fld     REAL8 PTR [ebx + 40]
        fld     REAL8 PTR [ebx + 48]
        fld     REAL8 PTR [ebx + 56]
        ;fld        REAL8 PTR [ebx + 64]
        ;fld        REAL8 PTR [ebx + 72]

        fadd
        fadd
        fadd
        fadd
        fadd
        fadd
        fadd
        ;fadd
        ;fadd
        fwait   ; if necessary wait for the co-processor to finish
        ret
_Average endp

extern "C" double Average (int, double []);

void main ()
    {
    double Array1 [10] = {1.1, 2.2, 3.3, 4.4, 5.5, 6.6, 7.7, 8.8, 9.9, 10.0};

    double Array2 [11] = {-1.1, -2.2, -3.3, -4.4, -5.5, -6.6, -7.7, -8.8, -9.9, -10.0, -11.0};

    cout << "Average of Array1 is " << Average (10, Array1) << endl;

    cout << "Average of Array2 is " << Average (11, Array2) << endl;

    }

Answer 1

保持一个正在运行的总数而不是全部加载它们然后全部添加它们。

Answer 2

首先无需加载然后添加，您可以这样做：

fld    real8 ptr [ebx]
fadd   real8 ptr [ebx + 8]
fadd   real8 ptr [ebx + 16]
fadd   real8 ptr [ebx + 24]

依旧......

添加浮点数组

2 个答案: