Index: include/llvm/Target/TargetRegisterInfo.h
===================================================================
--- include/llvm/Target/TargetRegisterInfo.h
+++ include/llvm/Target/TargetRegisterInfo.h
@@ -469,6 +469,10 @@
     return nullptr;
   }
 
+  /// Return all the call-preserved register masks defined for this target.
+  virtual ArrayRef<const uint32_t *> getRegMasks() const = 0;
+  virtual ArrayRef<const char *> getRegMaskNames() const = 0;
+
   /// getReservedRegs - Returns a bitset indexed by physical register number
   /// indicating if a register is a special register that has particular uses
   /// and should be considered unavailable at all times, e.g. SP, RA. This is
Index: utils/TableGen/RegisterInfoEmitter.cpp
===================================================================
--- utils/TableGen/RegisterInfoEmitter.cpp
+++ utils/TableGen/RegisterInfoEmitter.cpp
@@ -1094,6 +1094,8 @@
      << "const TargetRegisterClass *RC) const override;\n"
      << "  const int *getRegUnitPressureSets("
      << "unsigned RegUnit) const override;\n"
+     << "  ArrayRef<const char *> getRegMaskNames() const override;\n"
+     << "  ArrayRef<const uint32_t *> getRegMasks() const override;\n"
      << "};\n\n";
 
   const auto &RegisterClasses = RegBank.getRegClasses();
@@ -1445,6 +1447,26 @@
   }
   OS << "\n\n";
 
+  OS << "ArrayRef<const uint32_t *> " << ClassName
+     << "::getRegMasks() const {\n";
+  OS << "  static const uint32_t *Masks[] = {\n";
+  for (Record *CSRSet : CSRSets)
+    OS << "    " << CSRSet->getName() << "_RegMask, \n";
+  OS << "    nullptr\n  };\n";
+  OS << "  return ArrayRef<const uint32_t *>(Masks, (size_t)" << CSRSets.size()
+     << ");\n";
+  OS << "}\n\n";
+
+  OS << "ArrayRef<const char *> " << ClassName
+     << "::getRegMaskNames() const {\n";
+  OS << "  static const char *Names[] = {\n";
+  for (Record *CSRSet : CSRSets)
+    OS << "    " << '"' << CSRSet->getName() << '"' << ",\n";
+  OS << "    nullptr\n  };\n";
+  OS << "  return ArrayRef<const char *>(Names, (size_t)" << CSRSets.size()
+     << ");\n";
+  OS << "}\n\n";
+
   OS << "} // End llvm namespace\n";
   OS << "#endif // GET_REGINFO_TARGET_DESC\n\n";
 }