[Sparc] Return true in enableMultipleCopyHints().

Enable multiple COPY hints to eliminate more COPYs during register allocation.

Note that this is something all targets should do, see
https://reviews.llvm.org/D38128.

Review: James Y Knight
llvm-svn: 326028

1 files changed, 2 insertions, 0 deletions

diff --git a/llvm/lib/Target/Sparc/SparcRegisterInfo.h b/llvm/lib/Target/Sparc/SparcRegisterInfo.h
index 8dd2569d10d..2a279dad5ae 100644
--- a/llvm/lib/Target/Sparc/SparcRegisterInfo.h
+++ b/llvm/lib/Target/Sparc/SparcRegisterInfo.h
@@ -35,6 +35,8 @@ struct SparcRegisterInfo : public SparcGenRegisterInfo {
   const TargetRegisterClass *getPointerRegClass(const MachineFunction &MF,
                                                 unsigned Kind) const override;
 
+  bool enableMultipleCopyHints() const override { return true; }
+
   void eliminateFrameIndex(MachineBasicBlock::iterator II,
                            int SPAdj, unsigned FIOperandNum,
                            RegScavenger *RS = nullptr) const override;