Function core::arch::x86_64::_blcfill_u64

pub unsafe fn _blcfill_u64(x: 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 tbm only.

Clears all bits below the least significant zero bit of x.

If there is no zero bit in x, it returns zero.