Intrinsics based approach usind AD_X is currently blocked on LLVM.

[recmo]

On 2020-03-18 @recmo wrote in 8b465c5 “Intrinsics are not going to work any time soon”:

Intrinsics based approach usind AD_X is currently blocked on LLVM.
See rust-lang/stdarch#666
See https://bugs.llvm.org/show_bug.cgi?id=41546

#![allow(unsafe_code)]
use crate::{MontgomeryParameters, U256};
use std::mem::MaybeUninit;

// TODO: Intrinsics based approach usind AD_X is currently blocked on LLVM.
// See <https://github.com/rust-lang/stdarch/issues/666>
// See <https://bugs.llvm.org/show_bug.cgi?id=41546>

// For instruction timings and through puts
// See <https://gmplib.org/~tege/x86-timing.pdf>

// For examples using mulx/adcx

From algebra/u256/src/algorithms/assembly.rs:5