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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 instruction rather than the sho...

...HF, CPUID, etc to see the minimal amount of tablegen you need to add. On Thu, Jul 14, 2016 at 4:06 AM, Dean Michael Berris <dberris at google.com> wrote: > 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 instruction...