[PATCH] D17980: [lld] [ELF/AArch64] Add GD to IE TLS relax optimization

[Adhemerval Zanella via llvm-commits]

zatrazz created this revision.
zatrazz added reviewers: ruiu, rafael.
zatrazz added subscribers: grimar, emaste, rengolin, llvm-commits.
zatrazz set the repository for this revision to rL LLVM.
zatrazz added a project: lld.
Herald added a subscriber: aemerson.

This patch add the TLS Global-Dynamic to Initial-Exec TLS optimization
for AArch64.  Similar of GD to LE, the idea is to optimize TLS access
to global symbols that can preempted by emitting a GOT entry and
a dynamic relocation (R_AARCH64_TLS_TPREL64).

With this patch, the R_AARCH64_TLSDESC* implementation [1]
(still in review), and a small one for aarch64 to fix the relativeRel
definition (which I plan to send for review shortly) I can bootstrap
and run all the lld tests without failure.

Repository:
  rL LLVM

http://reviews.llvm.org/D17980

Files:
  ELF/Target.cpp
  test/ELF/Inputs/aarch64-tls-ie.s
  test/ELF/aarch64-tls-gdie.s

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