Constant core::arch::x86_64::_XBEGIN_STARTED

pub const _XBEGIN_STARTED: u32 = !0; // 0xffff_ffffu32

🔬 This is a nightly-only experimental API. (stdsimd #48556)

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

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