[PATCH] D18869: AArch64: Use a callee save registers for swiftself parameters

[Matthias Braun via llvm-commits]

MatzeB created this revision.
MatzeB added reviewers: t.p.northover, manmanren, qcolombet.
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MatzeB set the repository for this revision to rL LLVM.
Herald added subscribers: mcrosier, rengolin, aemerson.

It is very likely that the swiftself parameter is alive throughout most
functions. Putting it into a callee save register should avoid spills
for callers with only a few extra spills in callees.

Currently the generated code is correct but unnecessarily spills and
reloads arguments passed in callee save registers, I will address this
in upcoming patches.

Repository:
  rL LLVM

http://reviews.llvm.org/D18869

Files:
  lib/Target/AArch64/AArch64CallingConvention.td
  lib/Target/AArch64/AArch64FrameLowering.cpp
  test/CodeGen/AArch64/swiftself.ll

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