[PATCH] Add support for part-word atomics for PPC

[Nemanja Ivanovic]

Hi wschmidt, hfinkel, kbarton,

This patch does two things:
1. Adds support for part-word atomic instructions for Power7 (ISA 2.06) and Power8 (ISA 2.07)
2. Adds the "lock" versions of all of the loads. These are the loads with the Exclusive Access hint bit set to 1
Atomic instructions in the IR will now use the part-word versions on platforms that support them (for types i8 and i16). The lock versions are only available through asm for now.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D8090

Files:
  lib/Target/PowerPC/PPC.td
  lib/Target/PowerPC/PPCISelLowering.cpp
  lib/Target/PowerPC/PPCISelLowering.h
  lib/Target/PowerPC/PPCInstr64Bit.td
  lib/Target/PowerPC/PPCInstrInfo.td
  lib/Target/PowerPC/PPCSubtarget.h
  test/CodeGen/PowerPC/atomic-2.ll
  test/MC/Disassembler/PowerPC/ppc64-encoding-bookII.txt
  test/MC/PowerPC/ppc64-encoding-bookII.s

EMAIL PREFERENCES
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