Is NOT missing from SSE, AVX? : <p>Is it my imagination, or is a <code>PNOT</code> instruction missing from SSE and AVX? That is, an instruction which flips every bit in the vector.</p>

<p>If yes, is there a better way of emulating it than <code>PXOR</code> with a vector of all 1s? Quite annoying since I need to set up a vector of all 1s to use that approach.</p>
