[PATCH] D40979: [DWARF] Allow duplication of tails with CFI instructions

[Djordje Kovacevic via Phabricator via llvm-commits]

djokov created this revision.
Herald added subscribers: JDevlieghere, javed.absar.

This commit came as a result for revert of patch r317579 (originally committed as r317100). The patch made CFI instructions duplicable, because their existence in the epilogue block was affecting the Tail duplication pass. However, duplicating blocks with CFI instructions was an issue for compact unwind info on Darwin, which is why the patch was reverted.

This patch allows duplicating tails with CFI instructions, though they are not duplicable, by copying them 'manually'.


Repository:
  rL LLVM

https://reviews.llvm.org/D40979

Files:
  lib/CodeGen/TailDuplicator.cpp
  test/CodeGen/AArch64/taildup-cfi.ll

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