Hi,

I'm wondering if it's possible todo PGO with rustc. I was searching and haven't really found something concrete aside from a few messages in mailing list.

I guess it should be possible(if added to the compiler), as it's supported by LLVM(also it looks like Google might be interested in improving this, http://lists.cs.uiuc.edu/pipermail/llvmdev/2015-February/082744.html).

Also, i've heard the work on Superoptimer for LLVM, and i'm curious about what result will it give when run against code generated by rustc.

All of these seem low hanging performance fruit, though enabling them might mean a lot of work.

Thanks