[PATCH] D18902: X86: Use a callee save register for the swiftself parameter.

[Matthias Braun via llvm-commits]

MatzeB created this revision.
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It is very likely that the swiftself parameter is alive throughout most
functions function so putting it into a callee save register should
avoid spills for the callers with only a minimum amount of extra spills
in the 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/D18902

Files:
  lib/Target/X86/X86CallingConv.td
  lib/Target/X86/X86FrameLowering.cpp
  test/CodeGen/X86/swiftself.ll

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