Most efficient way to check if all __m128i components are 0 [using

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You can use the PTEST instuction via the _mm_testz_si128 intrinsic (SSE4.1), like this:

#include "smmintrin.h" // SSE4.1 header

if (!_mm_testz_si128(xor, xor))
{
    // rectangle has changed
}

Note that _mm_testz_si128 returns 1 if the bitwise AND of the two arguments is zero.

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