Add TargetInstrInfo::copyPhysReg hook and use it from LowerSubregs.

This target hook is intended to replace copyRegToReg entirely, but for now it
calls copyRegToReg.

Any remaining calls to copyRegToReg wil be replaced by COPY instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107854 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 17 insertions, 0 deletions

diff --git a/lib/CodeGen/TargetInstrInfoImpl.cpp b/lib/CodeGen/TargetInstrInfoImpl.cpp
index 5e145cf2de..ff8d0ede82 100644
--- a/lib/CodeGen/TargetInstrInfoImpl.cpp
+++ b/lib/CodeGen/TargetInstrInfoImpl.cpp
@@ -365,3 +365,20 @@ ScheduleHazardRecognizer *TargetInstrInfoImpl::
 CreateTargetPostRAHazardRecognizer(const InstrItineraryData &II) const {
   return (ScheduleHazardRecognizer *)new PostRAHazardRecognizer(II);
 }
+
+// Default implementation of copyPhysReg using copyRegToReg.
+void TargetInstrInfoImpl::copyPhysReg(MachineBasicBlock &MBB,
+                                      MachineBasicBlock::iterator MI,
+                                      DebugLoc DL,
+                                      unsigned DestReg, unsigned SrcReg,
+                                      bool KillSrc) const {
+  assert(TargetRegisterInfo::isPhysicalRegister(DestReg));
+  assert(TargetRegisterInfo::isPhysicalRegister(SrcReg));
+  const TargetRegisterInfo *TRI = MBB.getParent()->getTarget().getRegisterInfo();
+  const TargetRegisterClass *DRC = TRI->getPhysicalRegisterRegClass(DestReg);
+  const TargetRegisterClass *SRC = TRI->getPhysicalRegisterRegClass(SrcReg);
+  if (!copyRegToReg(MBB, MI, DestReg, SrcReg, DRC, SRC, DL))
+    llvm_unreachable("Cannot emit physreg copy instruction");
+  if (KillSrc)
+    llvm::prior(MI)->addRegisterKilled(SrcReg, TRI, true);
+}