[PATCH] D17659: [X86] Move the ATOMIC_LOAD_OP ISel from DAGToDAG to ISelLowering. NFCI.

[Ahmed Bougacha via llvm-commits]

ab created this revision.
ab added reviewers: jfb, t.p.northover.
ab added subscribers: llvm-commits, qcolombet.

This is long-standing dirtiness, as acknowledged by r77582:

    The current trick is to select it into a merge_values with
    the first definition being an implicit_def. The proper solution is
    to add new ISD opcodes for the no-output variant.

Doing this before selection will let us combine away some constructs.

http://reviews.llvm.org/D17659

Files:
  lib/Target/X86/X86ISelDAGToDAG.cpp
  lib/Target/X86/X86ISelLowering.cpp
  lib/Target/X86/X86ISelLowering.h
  lib/Target/X86/X86InstrCompiler.td
  lib/Target/X86/X86InstrInfo.td

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