🔬This is a nightly-only experimental API. (
Available on (x86 or x86-64) and target feature
avx512f,avx512vland x86 only.
Shift packed 64-bit integers in a right by the amount specified by the corresponding element in count while shifting in sign bits, and store the results in dst using zeromask k (elements are zeroed out when the corresponding mask bit is not set).