diff --git a/include/llvm/MC/MCRegisterInfo.h b/include/llvm/MC/MCRegisterInfo.h
index 6edfc30b0aa..8d8c677c77e 100644
--- a/include/llvm/MC/MCRegisterInfo.h
+++ b/include/llvm/MC/MCRegisterInfo.h
@@ -41,7 +41,6 @@ public:
   const uint16_t RegsSize;
   const uint16_t RegSetSize;
   const uint16_t ID;
-  const uint16_t PhysRegSize;
   const int8_t CopyCost;
   const bool Allocatable;
 
@@ -80,11 +79,6 @@ public:
     return contains(Reg1) && contains(Reg2);
   }
 
-  /// Return the size of the physical register in bytes.
-  unsigned getPhysRegSize() const { return PhysRegSize; }
-  /// Temporary function to allow out-of-tree targets to switch.
-  unsigned getSize() const { return getPhysRegSize(); }
-
   /// getCopyCost - Return the cost of copying a value between two registers in
   /// this class. A negative number means the register class is very expensive
   /// to copy e.g. status flag register classes.
diff --git a/lib/CodeGen/TargetInstrInfo.cpp b/lib/CodeGen/TargetInstrInfo.cpp
index 963f8178b50..034ad9a4982 100644
--- a/lib/CodeGen/TargetInstrInfo.cpp
+++ b/lib/CodeGen/TargetInstrInfo.cpp
@@ -388,8 +388,7 @@ bool TargetInstrInfo::getStackSlotRange(const TargetRegisterClass *RC,
     return true;
   }
   unsigned BitSize = TRI->getSubRegIdxSize(SubIdx);
-  // Convert bit size to byte size to be consistent with
-  // MCRegisterClass::getSize().
+  // Convert bit size to byte size.
   if (BitSize % 8)
     return false;
 
diff --git a/utils/TableGen/RegisterInfoEmitter.cpp b/utils/TableGen/RegisterInfoEmitter.cpp
index 532426c3fe9..7c38dc55e81 100644
--- a/utils/TableGen/RegisterInfoEmitter.cpp
+++ b/utils/TableGen/RegisterInfoEmitter.cpp
@@ -1075,14 +1075,10 @@ RegisterInfoEmitter::runMCDesc(raw_ostream &OS, CodeGenTarget &Target,
 
   for (const auto &RC : RegisterClasses) {
     assert(isInt<8>(RC.CopyCost) && "Copy cost too large.");
-    uint32_t RegSize = 0;
-    if (RC.RSI.isSimple())
-      RegSize = RC.RSI.getSimple().RegSize;
     OS << "  { " << RC.getName() << ", " << RC.getName() << "Bits, "
        << RegClassStrings.get(RC.getName()) << ", "
        << RC.getOrder().size() << ", sizeof(" << RC.getName() << "Bits), "
        << RC.getQualifiedName() + "RegClassID" << ", "
-       << RegSize/8 << ", "
        << RC.CopyCost << ", "
        << ( RC.Allocatable ? "true" : "false" ) << " },\n";
   }