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  1. Reland [AArch64][MachineOutliner] Return address signing for outlined (details)
Commit cec2d5c17457722113580251c8a045fa9aca9b1b by david.tellenbach
Reland [AArch64][MachineOutliner] Return address signing for outlined
Summary: Reland after fixing an ASan failure by stopping outlining early
if the constraints for return address signing removed too many outlining
During AArch64 frame lowering instructions to enable return address
signing are inserted into functions if needed. Functions generated
during machine outlining don't run through target frame lowering and
hence are missing such instructions.
This patch introduces the following changes:
1. If not all functions that potentially participate in function
outlining agree
  on their return address signing scope and their return address signing
  outlining is disabled for these functions. 2. If not all functions
that potentially participate in function outlining agree
  on their support for v8.3A features, outlining is disabled for these
  functions. 3. If an outlining candidate would outline instructions
that modify sp in a way
  that invalidates return address signing, outlining is disabled for
  particular candidate. 4. If all candidate functions agree on the
signing scope, signing key and their
  support for v8.3 features, the outlined function behaves as if it had
  same scope and key attributes and as if it would provide the same
  support as the original functions.
Reviewers: ostannard, paquette
Reviewed By: ostannard
Subscribers: kristof.beyls, hiraditya, llvm-commits
Tags: #llvm
Differential Revision:
The file was addedllvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-regsave.mir
The file was addedllvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-same-scope-diff-key.ll
The file was addedllvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-same-scope-same-key-b.ll
The file was modifiedllvm/lib/Target/AArch64/AArch64InstrInfo.cpp
The file was addedllvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-non-leaf.ll
The file was addedllvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-sp-mod.mir
The file was addedllvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-same-scope-same-key-a.ll
The file was addedllvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-diff-scope-same-key.ll
The file was addedllvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-thunk.ll
The file was addedllvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-cfi.ll
The file was addedllvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-v8-3.ll
The file was addedllvm/test/CodeGen/AArch64/machine-outliner-retaddr-sign-subtarget.ll