9c4e418fe0
This intrinsic isn't actually specified by Intel, but it's something gated with CPUID and can otherwise be a useful thing to have when building primitives! There exists an `AtomicU128` type in the standard library but it's only exposed currently (and it's unstable) when a platform fully supports 128-bit atomics. The x86_64 architecture does not support it *unless* the `cmpxchg16b` instruction is available, and it isn't always available! This commit is also a proposal for how we can include support for 128-bit atomics in the standard library on relevant platforms. I'm thinking that we'll expose this one low-level intrinsic in `std::arch::x86_64`, and then if desired a crate on crates.io can build `AtomicU128` from this API. In any case this is all unstable regardless! |
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| assert-instr-macro | ||
| coresimd | ||
| simd-test-macro | ||
| stdsimd | ||
| stdsimd-test | ||
| stdsimd-verify | ||