[PATCH] D37139: [x86] Extend the manual ISel of `add` and `sub` with both RMW memory operands and used flags to support matching immediate operands.

[Chandler Carruth via Phabricator via llvm-commits]

chandlerc updated this revision to Diff 112766.
chandlerc added a comment.

Update with minor formatting fixes and a major fix to correctly detect usage of
CF from an operation and suppress toggling between ADD and SUB in that case.

We could in theory *invert* the usage in the case of conditional branches and
such but it doesn't seem worth it.


https://reviews.llvm.org/D37139

Files:
  lib/Target/X86/X86ISelDAGToDAG.cpp
  test/CodeGen/X86/add.ll
  test/CodeGen/X86/fold-rmw-ops.ll
  test/CodeGen/X86/peephole-na-phys-copy-folding.ll
  test/CodeGen/X86/pr32659.ll

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