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POSSE2 - 16-byte aligned dynamic allocation of memory
 

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    <p><strong>EDIT:</strong> </p> <p>This is a followup to <a href="https://stackoverflow.com/questions/1874882/sse2-compiler-error">SSE2 Compiler Error</a></p> <p>This is the <strong>real</strong> bug I experienced before and have reproduced below by changing the <code>_mm_malloc</code> statement as <a href="https://stackoverflow.com/questions/1876433/sse2-16-byte-aligned-dynamic-allocation-of-memory/1876448#1876448">Michael Burr</a> suggested:</p> <blockquote> <p>Unhandled exception at 0x00415116 in SO.exe: 0xC0000005: Access violation reading location 0xffffffff.</p> </blockquote> <p>At line <code>label: movdqa xmm0, xmmword ptr [t1+eax]</code></p> <p>I'm trying to dynamically allocate <code>t1</code> and <code>t2</code> and <a href="http://www.developers.net/intelisnshowcase/view/116" rel="nofollow noreferrer">according to this tutorial</a>, I've used <code>_mm_malloc</code>:</p> <pre><code>#include &lt;emmintrin.h&gt; int main(int argc, char* argv[]) { int *t1, *t2; const int n = 100000; t1 = (int*)_mm_malloc(n*sizeof(int),16); t2 = (int*)_mm_malloc(n*sizeof(int),16); __m128i mul1, mul2; for (int j = 0; j &lt; n; j++) { t1[j] = j; t2[j] = (j+1); } // set temporary variables to random values _asm { mov eax, 0 label: movdqa xmm0, xmmword ptr [t1+eax] movdqa xmm1, xmmword ptr [t2+eax] pmuludq xmm0, xmm1 movdqa mul1, xmm0 movdqa xmm0, xmmword ptr [t1+eax] pshufd xmm0, xmm0, 05fh pshufd xmm1, xmm1, 05fh pmuludq xmm0, xmm1 movdqa mul2, xmm0 add eax, 16 cmp eax, 100000 jnge label } _mm_free(t1); _mm_free(t2); return 0; } </code></pre>
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