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Beginner
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stack around variable x, sse2 intrinsic codes

though the codes compiles well, the programe gives the message "run time check failure, stack around variable x", where i am doing it wrong? the output y is equally wrong. data type is short 2-D array.

//.h file

#define _SSEEXAMPLE1_H

#include

__declspec(align(16))class sseexample1

{

public:

void charles(__m128i *x, __m128i *y);

};

#endif

//.cpp file

#include "stdafx.h"

#include

#include

#include "sseexample1.h"

void sseexample1::charles(__m128i* x,__m128i* y)

{

int j;

__m128i p,q,s;

for (j = 0;j<4;j++)

{

p =_mm_loadu_si128(&x);//load row one of x

q =_mm_loadu_si128(&x[j+1]);// load row 2 of x

s = _mm_add_epi16(p,q);// add row one and two

_mm_storeu_si128(&y,s);

}

}

//main.cpp file

#include "stdafx.h"

#include

#include

#include "sseexample1.h"

#include

using namespace std;

int _tmain(int argc, _TCHAR* argv[])

{

short x[4][4]={1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4};

short y[4][4];

//int s[4];

sseexample1 z;

z.charles((__m128i*)x,(__m128i*)y);

for (int j = 0; j < 4; j++)

cout << y << " ";

cout << endl;

return 0;

}

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1 Reply
Highlighted
New Contributor II
38 Views

in c, 2D array is kept in memory as 1D array of pointers to 1D arrays

so when reading your x value, you are actually reading a vector of pointers. try to pass to the function &x[0][0] as argument
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