Function core::arch::x86::_tzmsk_u64

pub unsafe fn _tzmsk_u64(x: u64) -> u64

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

Sets all bits below the least significant one of x and clears all other bits.

If the least significant bit of x is 1, it returns zero.