search for: jmpb

...labels, it uses the short encoding, but apparently because of -mc-relax-all, that won't actually work with clang either. It's all quite complicated, and we should just expose a simple way for the user to ask for what they want. Assuming we go with this, I propose we use the mneumonic "jmpb". It seems consistent with gas's size suffixes, but I'm open to other ideas. Normal (non-xray) ISel should never produce this instruction, so we don't need any SDAG patterns for it. You should be able to look at existing rare x86 instructions that don't have SDAG nodes, like P...

Hi llvm-dev, In the review of the LLVM-side changes to support XRay (which is now upstream as http://reviews.llvm.org/rL275367) we hit one particular case where we had to hack around the fact that we have no way to force the emission of a short relative jump. It's even come up that jump relaxation can come in and (at least with clang -O0) relax jumps to use the longer version of the jump