Some platforms use the same name for 32-bit and 64-bit registers (like

%r3 on PPC) in their ASM files. However, it's hard for humans to read
during debugging. Adding a new field to the register data that lets you
specify a different name to be printed than the one that goes into the
ASM file -- %x3 instead of %r3, for instance.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47534 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Target/TargetRegisterInfo.h

@@ -49,6 +49,7 @@ class Type;
 ///
 struct TargetRegisterDesc {
   const char     *Name;         // Assembly language name for the register
+  const char     *PrintableName;// Printable name for the reg (for debugging)
   const unsigned *AliasSet;     // Register Alias Set, described above
   const unsigned *SubRegs;      // Sub-register set, described above
   const unsigned *ImmSubRegs;   // Immediate sub-register set, described above
@@ -381,6 +382,12 @@ public:
     return get(RegNo).Name;
   }
 
+  /// getPrintableName - Return the human-readable symbolic target specific name
+  /// for the specified physical register.
+  const char *getPrintableName(unsigned RegNo) const {
+    return get(RegNo).PrintableName;
+  }
+
   /// getNumRegs - Return the number of registers this target has (useful for
   /// sizing arrays holding per register information)
   unsigned getNumRegs() const {

lib/CodeGen/MachineInstr.cpp

@@ -174,7 +174,7 @@ void MachineOperand::print(std::ostream &OS, const TargetMachine *TM) const {
               TM = &MF->getTarget();
       
       if (TM)
-        OS << "%" << TM->getRegisterInfo()->get(getReg()).Name;
+        OS << "%" << TM->getRegisterInfo()->get(getReg()).PrintableName;
       else
         OS << "%mreg" << getReg();
     }

lib/Target/PowerPC/PPCRegisterInfo.td

@@ -1,4 +1,4 @@
-//===- PowerPCRegisterInfo.td - The PowerPC Register File --*- tablegen -*-===//
+//===- PPCRegisterInfo.td - The PowerPC Register File ------*- tablegen -*-===//
 // 
 //                     The LLVM Compiler Infrastructure
 //
@@ -22,9 +22,10 @@ class GPR<bits<5> num, string n> : PPCReg<n> {
 }
 
 // GP8 - One of the 32 64-bit general-purpose registers
-class GP8<GPR SubReg> : PPCReg<SubReg.Name> {
+class GP8<GPR SubReg, string n> : PPCReg<SubReg.Name> {
   field bits<5> Num = SubReg.Num;
   let SubRegs = [SubReg];
+  let PrintableName = n;
 }
 
 // SPR - One of the 32-bit special-purpose registers
@@ -88,38 +89,38 @@ def R30 : GPR<30, "r30">, DwarfRegNum<[30]>;
 def R31 : GPR<31, "r31">, DwarfRegNum<[31]>;
 
 // 64-bit General-purpose registers
-def X0  : GP8< R0>, DwarfRegNum<[0]>;
-def X1  : GP8< R1>, DwarfRegNum<[1]>;
-def X2  : GP8< R2>, DwarfRegNum<[2]>;
-def X3  : GP8< R3>, DwarfRegNum<[3]>;
-def X4  : GP8< R4>, DwarfRegNum<[4]>;
-def X5  : GP8< R5>, DwarfRegNum<[5]>;
-def X6  : GP8< R6>, DwarfRegNum<[6]>;
-def X7  : GP8< R7>, DwarfRegNum<[7]>;
-def X8  : GP8< R8>, DwarfRegNum<[8]>;
-def X9  : GP8< R9>, DwarfRegNum<[9]>;
-def X10 : GP8<R10>, DwarfRegNum<[10]>;
-def X11 : GP8<R11>, DwarfRegNum<[11]>;
-def X12 : GP8<R12>, DwarfRegNum<[12]>;
-def X13 : GP8<R13>, DwarfRegNum<[13]>;
-def X14 : GP8<R14>, DwarfRegNum<[14]>;
-def X15 : GP8<R15>, DwarfRegNum<[15]>;
-def X16 : GP8<R16>, DwarfRegNum<[16]>;
-def X17 : GP8<R17>, DwarfRegNum<[17]>;
-def X18 : GP8<R18>, DwarfRegNum<[18]>;
-def X19 : GP8<R19>, DwarfRegNum<[19]>;
-def X20 : GP8<R20>, DwarfRegNum<[20]>;
-def X21 : GP8<R21>, DwarfRegNum<[21]>;
-def X22 : GP8<R22>, DwarfRegNum<[22]>;
-def X23 : GP8<R23>, DwarfRegNum<[23]>;
-def X24 : GP8<R24>, DwarfRegNum<[24]>;
-def X25 : GP8<R25>, DwarfRegNum<[25]>;
-def X26 : GP8<R26>, DwarfRegNum<[26]>;
-def X27 : GP8<R27>, DwarfRegNum<[27]>;
-def X28 : GP8<R28>, DwarfRegNum<[28]>;
-def X29 : GP8<R29>, DwarfRegNum<[29]>;
-def X30 : GP8<R30>, DwarfRegNum<[30]>;
-def X31 : GP8<R31>, DwarfRegNum<[31]>;
+def X0  : GP8< R0,  "x0">, DwarfRegNum<[0]>;
+def X1  : GP8< R1,  "x1">, DwarfRegNum<[1]>;
+def X2  : GP8< R2,  "x2">, DwarfRegNum<[2]>;
+def X3  : GP8< R3,  "x3">, DwarfRegNum<[3]>;
+def X4  : GP8< R4,  "x4">, DwarfRegNum<[4]>;
+def X5  : GP8< R5,  "x5">, DwarfRegNum<[5]>;
+def X6  : GP8< R6,  "x6">, DwarfRegNum<[6]>;
+def X7  : GP8< R7,  "x7">, DwarfRegNum<[7]>;
+def X8  : GP8< R8,  "x8">, DwarfRegNum<[8]>;
+def X9  : GP8< R9,  "x9">, DwarfRegNum<[9]>;
+def X10 : GP8<R10, "x10">, DwarfRegNum<[10]>;
+def X11 : GP8<R11, "x11">, DwarfRegNum<[11]>;
+def X12 : GP8<R12, "x12">, DwarfRegNum<[12]>;
+def X13 : GP8<R13, "x13">, DwarfRegNum<[13]>;
+def X14 : GP8<R14, "x14">, DwarfRegNum<[14]>;
+def X15 : GP8<R15, "x15">, DwarfRegNum<[15]>;
+def X16 : GP8<R16, "x16">, DwarfRegNum<[16]>;
+def X17 : GP8<R17, "x17">, DwarfRegNum<[17]>;
+def X18 : GP8<R18, "x18">, DwarfRegNum<[18]>;
+def X19 : GP8<R19, "x19">, DwarfRegNum<[19]>;
+def X20 : GP8<R20, "x20">, DwarfRegNum<[20]>;
+def X21 : GP8<R21, "x21">, DwarfRegNum<[21]>;
+def X22 : GP8<R22, "x22">, DwarfRegNum<[22]>;
+def X23 : GP8<R23, "x23">, DwarfRegNum<[23]>;
+def X24 : GP8<R24, "x24">, DwarfRegNum<[24]>;
+def X25 : GP8<R25, "x25">, DwarfRegNum<[25]>;
+def X26 : GP8<R26, "x26">, DwarfRegNum<[26]>;
+def X27 : GP8<R27, "x27">, DwarfRegNum<[27]>;
+def X28 : GP8<R28, "x28">, DwarfRegNum<[28]>;
+def X29 : GP8<R29, "x29">, DwarfRegNum<[29]>;
+def X30 : GP8<R30, "x30">, DwarfRegNum<[30]>;
+def X31 : GP8<R31, "x31">, DwarfRegNum<[31]>;
 
 // Floating-point registers
 def F0  : FPR< 0,  "f0">, DwarfRegNum<[32]>;

lib/Target/Target.td

@@ -26,6 +26,7 @@ class RegisterClass; // Forward def
 class Register<string n> {
   string Namespace = "";
   string Name = n;
+  string PrintableName = n;
 
   // SpillSize - If this value is set to a non-zero value, it is the size in
   // bits of the spill slot required to hold this register.  If this value is

utils/TableGen/RegisterInfoEmitter.cpp

@@ -512,7 +512,7 @@ void RegisterInfoEmitter::run(std::ostream &OS) {
   }
 
   OS<<"\n  const TargetRegisterDesc RegisterDescriptors[] = { // Descriptors\n";
-  OS << "    { \"NOREG\",\t0,\t0,\t0,\t0 },\n";
+  OS << "    { \"NOREG\",\t\"NOREG\",\t0,\t0,\t0,\t0 },\n";
 
   // Now that register alias and sub-registers sets have been emitted, emit the
   // register descriptors now.
@@ -524,6 +524,16 @@ void RegisterInfoEmitter::run(std::ostream &OS) {
       OS << Reg.TheDef->getValueAsString("Name");
     else
       OS << Reg.getName();
+    OS << "\",\t\"";
+    if (!Reg.TheDef->getValueAsString("PrintableName").empty()) {
+      OS << Reg.TheDef->getValueAsString("PrintableName");
+    } else {
+      // Default to "name".
+      if (!Reg.TheDef->getValueAsString("Name").empty())
+        OS << Reg.TheDef->getValueAsString("Name");
+      else
+        OS << Reg.getName();
+    }
     OS << "\",\t";
     if (RegisterAliases.count(Reg.TheDef))
       OS << Reg.getName() << "_AliasSet,\t";