Performing AVX integer operation

Question

I'm trying to optimize some integer (_int64) operations using AVX. However, I can't even simple add operation. It keeps telling me illegal instruction. Pls can I be corrected on what i'm doing wrong? Thanks

for (int i = 0; i < 1; i+=4)
{
    __m256i rA, rB, rC;
    __m256i *iu, *ju, *ku;

    iu =  (__m256i *)(MatrixAiB1 + i);
    ju =    (__m256i *)(MatrixAjB1+ i);
    ku = (__m256i *) (store+ i);

    rA=_mm256_load_si256(iu);
    rB=_mm256_load_si256(ju);
    rC=_mm256_add_epi16(rA,rB);
    _mm256_store_si256(ku,rC);

}

have a look at cpuid: [here](http://msdn.microsoft.com/en-us/library/hskdteyh(v=vs.100).aspx) or [here](http://en.wikipedia.org/wiki/CPUID) — joy, Apr 29 '13 at 18:35

score 5 · Answer 1 · answered Apr 29 '13 at 17:42

5

You are using instructions from the AVX 2 instruction set, which is not widely supported yet. The illegal instruction exception indicates that you are running the code on a machine that does not support these instructions.

These instructions are being first introduced in the Haswell processors this year - so "not widely supported" currently means "not supported by any publicly available processor".

answered Apr 29 '13 at 17:42

Sam Harwell

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Thnks a lot. Needed to confirm – FrancFine Apr 29 '13 at 17:54

Performing AVX integer operation

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