Function core::arch::x86_64::_bzhi_u64

pub unsafe fn _bzhi_u64(a: u64, index: u32) -> 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.

Zeroes higher bits of a >= index.

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