[RegisterCoalescer] Add new subtarget hook allowing targets to opt-out of coalescing.

[oota-llvm.git] / lib / Target / ARM / ARMSubtarget.h

diff --git a/lib/Target/ARM/ARMSubtarget.h b/lib/Target/ARM/ARMSubtarget.h
index 44d2159cb548c54bf6be436ccde773e127db9fc8..626bb0e7860946af3602526d2861a766537ca4d3 100644 (file)
--- a/lib/Target/ARM/ARMSubtarget.h
+++ b/lib/Target/ARM/ARMSubtarget.h
@@ -451,6 +451,14 @@ public:
   /// GVIsIndirectSymbol - true if the GV will be accessed via an indirect
   /// symbol.
   bool GVIsIndirectSymbol(const GlobalValue *GV, Reloc::Model RelocM) const;
+
+  /// \brief SrcRC and DstRC will be morphed into NewRC if this returns true
+  bool shouldCoalesce(MachineInstr *MI,
+                      const TargetRegisterClass *SrcRC,
+                      unsigned SubReg,
+                      const TargetRegisterClass *DstRC,
+                      unsigned DstSubReg,
+                      const TargetRegisterClass *NewRC) const override;
 };
 } // End llvm namespace