f065c9dab1
implement `carryless_mul` tracking issue: https://github.com/rust-lang/rust/issues/152080 ACP: https://github.com/rust-lang/libs-team/issues/738 This defers to LLVM's `llvm.clmul` when available, and otherwise falls back to a method from the `polyval` crate ([link](https://github.com/RustCrypto/universal-hashes/blob/master/polyval/src/field_element/soft/soft64.rs)). Some things are missing, which I think we can defer: - the ACP has some discussion about additional methods, but I'm not sure exactly what is wanted or how to implement it efficiently - the SIMD intrinsic is not yet `const` (I think I ran into a bootstrapping issue). That is fine for now, I think in `stdarch` we can't really use this intrinsic at the moment, we'd only want the scalar version to replace some riscv intrinsics. - the SIMD intrinsic is not implemented for the gcc and cranelift backends. That should be reasonably straightforward once we have a const eval implementation though. |
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