[PATCH] D18241: [mips] Fix ATOMIC_CMP_SWAP_WITH_SUCCESS

[Simon Dardis via llvm-commits]

sdardis created this revision.
sdardis added a reviewer: vkalintiris.
sdardis added subscribers: llvm-commits, dsanders.

emitAtomic*PartWord unconditionally sign extend their results causing
failures with __c11_atomic_compare_exchange_strong & co due to an
unsigned value being compared to a sign extended value.
    
Fix this by using a custom lowering for ATOMIC_CMP_SWAP_WITH_SUCCESS, so that
the cmp operand of the setCC is sign extended as well. Additionally, when
legalizing ATOMIC_CMP_SWAP, don't assume it is a ATOMIC_CMP_SWAP_WITH_SUCCESS.

http://reviews.llvm.org/D18241

Files:
  lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
  lib/Target/Mips/MipsISelLowering.cpp
  lib/Target/Mips/MipsISelLowering.h
  test/CodeGen/Mips/atomic.ll

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