Rust support for nontemporal stores?

[nominolo]

The _mm_stream_ps intrinsic implements a store to memory with a "non-temporal" hint (i.e., try not to pollute the cache). In the LLVM code this is implemented via __builtin_nontemporal_store which should compile to an LLIR store instruction with hint !nontemporal. e.g., something like:

store <8 x i64> %{{.*}}, <8 x i64>* %{{.*}}, align 64, !nontemporal

Is there a way to generate this in Rust, or do we need add this to the compiler first?

See also:

• store instruction docs
• a related LLVM change

[alexcrichton]

Ah yeah I believe we'll need to add support upstream for such an intrinsic, I don't think we can do this with rustc as-is today

[alexcrichton]

I've opened up an upstream PR to add this support to rustc