[PATCH] D31658: [LLD][ELF] Introduce Thunk reuse compatibility

[Peter Smith via Phabricator via llvm-commits]

peter.smith created this revision.
Herald added subscribers: rengolin, aemerson.

On ARM the interworking thunks are only produced for branch instructions that can't be changed into a blx instruction so only Thumb callers would call Thumb thunks and only ARM callers would call ARM thunks. With range extension thunks branch and link instructions may need a Thunk. These instructions can be rewritten as a blx and can use either ARM or Thumb thunks.

We introduce a compatibleWith() function so that a caller can check if an existing Thunk is compatible before reusing it.


https://reviews.llvm.org/D31658

Files:
  ELF/Relocations.cpp
  ELF/Thunks.cpp
  ELF/Thunks.h

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