Function core::arch::aarch64::__ttest

pub unsafe fn __ttest() -> u64

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

This is supported on AArch64 and target feature tme only.

测试是否在事务内执行。 如果当前没有事务在执行，则返回值为 0。 否则，此内联函数将返回事务的深度。 ARM TME Intrinsics.