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2016 Jun 29
0
x86: How to Force 2-byte `jmp` instruction in lowering
I thought jumps start short and relaxation widens them as needed until fixpoint. So relax-all causes them all to be widened unconditionally. On Wed, Jun 29, 2016 at 9:27 AM, Reid Kleckner via llvm-dev < llvm-dev at lists.llvm.org> wrote: > On Wed, Jun 22, 2016 at 9:36 AM, Nirav Davé <llvm-dev at lists.llvm.org> > wrote: > >> In any case, the issue appears to be that
2016 Jun 29
1
x86: How to Force 2-byte `jmp` instruction in lowering
...e been reading that code for years and assuming that it goes large-to-small, but I guess the process is the same regardless of which direction you go. :) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20160629/a01b486e/attachment.html>
2016 Jun 29
2
x86: How to Force 2-byte `jmp` instruction in lowering
On Wed, Jun 22, 2016 at 9:36 AM, Nirav Davé <llvm-dev at lists.llvm.org> wrote: > In any case, the issue appears to be that llvm doesn't realize that the > target address is resolved and erroneously applies branch relaxation to the > jump. I don't know why a linker private symbol would make a difference. > Relaxation is the process of *shortening* jumps that can be