Introduce register dump helper

llvm-svn: 222379

llvm/include/llvm/Target/TargetRegisterInfo.h

@@ -502,6 +502,10 @@ public:
     return composeSubRegIndicesImpl(a, b);
   }
 
+  /// Debugging helper: dump register in human readable form to dbgs() stream.
+  static void dumpReg(unsigned Reg, unsigned SubRegIndex = 0,
+                      const TargetRegisterInfo* TRI = nullptr);
+
 protected:
   /// Overridden by TableGen in targets that have sub-registers.
   virtual unsigned composeSubRegIndicesImpl(unsigned, unsigned) const {

llvm/lib/CodeGen/TargetRegisterInfo.cpp

@@ -16,6 +16,7 @@
 #include "llvm/CodeGen/MachineFunction.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/VirtRegMap.h"
+#include "llvm/Support/Debug.h"
 #include "llvm/Support/raw_ostream.h"
 
 using namespace llvm;
@@ -293,3 +294,11 @@ TargetRegisterInfo::getRegAllocationHints(unsigned VirtReg,
   // All clear, tell the register allocator to prefer this register.
   Hints.push_back(Phys);
 }
+
+#if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
+void
+TargetRegisterInfo::dumpReg(unsigned Reg, unsigned SubRegIndex,
+                            const TargetRegisterInfo *TRI) {
+  dbgs() << PrintReg(Reg, TRI, SubRegIndex) << "\n";
+}
+#endif