Function core::arch::x86_64::_pext_u64

pub unsafe fn _pext_u64(a: u64, mask: u64) -> u64

This is supported on (non-crate feature miri-test-libstd or test or doctest) and x86-64 and non-x86 and target feature bmi2 only.

Gathers the bits of x specified by the mask into the contiguous low order bit positions of the result.

Intel’s documentation