On Sat, Jun 21, 2014 at 6:02 PM, Daniel Micay <danielmi...@gmail.com> wrote: > It's not possible to add new instructions to x86_64 that are not large > and hard to decode. It's too late, nothing short of breaking backwards > compatibility by introducing a new architecture will provide trapping on > overflow without a performance hit. To repeat what I said elsewhere, > Rust's baseline would still be obsolete if it failed on overflow because > there's no indication that we can sanely / portably implement failure on > overflow via trapping. It's certainly not possible in LLVM right now.
Er... since when? Many single-byte opcodes in x86-64 corresponding to deprecated x86 instructions are currently undefined. _______________________________________________ Rust-dev mailing list Rust-dev@mozilla.org https://mail.mozilla.org/listinfo/rust-dev
