Vzeroall latency

Vzeroall latency

Hi, what kind of latency vzeroall has compared to vzeroupper?
From a code density's point of view a single vzeroall is clearly better than a sequence of xorps to zero a couple of xmm registers, but i can't find any infos on latency. Is it "for free" like vzeroupper (zero latency according to intel's optimization manual) of microcoded?.

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