On Sat, Jun 21, 2014 at 7:10 PM, Daniel Micay <danielmi...@gmail.com> wrote: >> Er... since when? Many single-byte opcodes in x86-64 corresponding to >> deprecated x86 instructions are currently undefined. > > http://ref.x86asm.net/coder64.html > > I don't see enough gaps here for the necessary instructions.
You can see a significant number of invalid one-byte entries, 06, 07, 0e, 1e, 1f, etc. The simplest addition would just be to resurrect INTO and make it efficient - assuming signed 64 and 32 bit integers are good enough for most use cases. Alternatively, it could be two one-byte instructions to add an unsigned version (perhaps a waste of precious slots) or a two-byte instruction which could perhaps allow trapping on any condition. Am I missing something? _______________________________________________ Rust-dev mailing list Rust-dev@mozilla.org https://mail.mozilla.org/listinfo/rust-dev
