RegisterPressure API. Add support for physical register units.

[oota-llvm.git] / utils / TableGen / RegisterInfoEmitter.cpp

diff --git a/utils/TableGen/RegisterInfoEmitter.cpp b/utils/TableGen/RegisterInfoEmitter.cpp
index 34a700c95572ecbf448ea78c3622d0bb29bb060e..935136f0d4389a03dff024ac4a3f775ab8ea721a 100644 (file)
--- a/utils/TableGen/RegisterInfoEmitter.cpp
+++ b/utils/TableGen/RegisterInfoEmitter.cpp
@@ -185,6 +185,34 @@ EmitRegUnitPressure(raw_ostream &OS, const CodeGenRegBank &RegBank,
      << "  return RCWeightTable[RC->getID()];\n"
      << "}\n\n";
 
+  // Reasonable targets (not ARMv7) have unit weight for all units, so don't
+  // bother generating a table.
+  bool RegUnitsHaveUnitWeight = true;
+  for (unsigned UnitIdx = 0, UnitEnd = RegBank.getNumNativeRegUnits();
+       UnitIdx < UnitEnd; ++UnitIdx) {
+    if (RegBank.getRegUnit(UnitIdx).Weight > 1)
+      RegUnitsHaveUnitWeight = false;
+  }
+  OS << "/// Get the weight in units of pressure for this register unit.\n"
+     << "unsigned " << ClassName << "::\n"
+     << "getRegUnitWeight(unsigned RegUnit) const {\n";
+  if (!RegUnitsHaveUnitWeight) {
+    OS << "  static const uint8_t RUWeightTable[] = {\n    ";
+    for (unsigned UnitIdx = 0, UnitEnd = RegBank.getNumNativeRegUnits();
+         UnitIdx < UnitEnd; ++UnitIdx) {
+      const RegUnit &RU = RegBank.getRegUnit(UnitIdx);
+      assert(RU.Weight < 256 && "RegUnit too heavy");
+      OS << RU.Weight << ", ";
+    }
+    OS << "0 };\n"
+       << "  return RUWeightTable[RegUnit];\n";
+  }
+  else {
+    OS << "  // All register units have unit weight.\n"
+       << "  return 1;\n";
+  }
+  OS << "}\n\n";
+
   OS << "\n"
      << "// Get the number of dimensions of register pressure.\n"
      << "unsigned " << ClassName << "::getNumRegPressureSets() const {\n"
@@ -215,14 +243,13 @@ EmitRegUnitPressure(raw_ostream &OS, const CodeGenRegBank &RegBank,
      << "  return PressureLimitTable[Idx];\n"
      << "}\n\n";
 
-  OS << "/// Get the dimensions of register pressure "
-     << "impacted by this register class.\n"
-     << "/// Returns a -1 terminated array of pressure set IDs\n"
-     << "const int* " << ClassName << "::\n"
-     << "getRegClassPressureSets(const TargetRegisterClass *RC) const {\n"
-     << "  static const int RCSetsTable[] = {\n    ";
-  std::vector<unsigned> RCSetStarts(NumRCs);
-  for (unsigned i = 0, StartIdx = 0, e = NumRCs; i != e; ++i) {
+  // This table may be larger than NumRCs if some register units needed a list
+  // of unit sets that did not correspond to a register class.
+  unsigned NumRCUnitSets = RegBank.getNumRegClassPressureSetLists();
+  OS << "/// Table of pressure sets per register class or unit.\n"
+     << "static const int RCSetsTable[] = {\n    ";
+  std::vector<unsigned> RCSetStarts(NumRCUnitSets);
+  for (unsigned i = 0, StartIdx = 0, e = NumRCUnitSets; i != e; ++i) {
     RCSetStarts[i] = StartIdx;
     ArrayRef<unsigned> PSetIDs = RegBank.getRCPressureSetIDs(i);
     for (ArrayRef<unsigned>::iterator PSetI = PSetIDs.begin(),
@@ -230,10 +257,26 @@ EmitRegUnitPressure(raw_ostream &OS, const CodeGenRegBank &RegBank,
       OS << *PSetI << ",  ";
       ++StartIdx;
     }
-    OS << "-1,  \t// " << RegBank.getRegClasses()[i]->getName() << "\n    ";
+    OS << "-1,  \t// #" << RCSetStarts[i] << " ";
+    if (i < NumRCs)
+      OS << RegBank.getRegClasses()[i]->getName();
+    else {
+      OS << "inferred";
+      for (ArrayRef<unsigned>::iterator PSetI = PSetIDs.begin(),
+             PSetE = PSetIDs.end(); PSetI != PSetE; ++PSetI) {
+        OS << "~" << RegBank.getRegPressureSet(*PSetI).Name;
+      }
+    }
+    OS << "\n    ";
     ++StartIdx;
   }
-  OS << "-1 };\n";
+  OS << "-1 };\n\n";
+
+  OS << "/// Get the dimensions of register pressure impacted by this "
+     << "register class.\n"
+     << "/// Returns a -1 terminated array of pressure set IDs\n"
+     << "const int* " << ClassName << "::\n"
+     << "getRegClassPressureSets(const TargetRegisterClass *RC) const {\n";
   OS << "  static const unsigned RCSetStartTable[] = {\n    ";
   for (unsigned i = 0, e = NumRCs; i != e; ++i) {
     OS << RCSetStarts[i] << ",";
@@ -242,6 +285,21 @@ EmitRegUnitPressure(raw_ostream &OS, const CodeGenRegBank &RegBank,
      << "  unsigned SetListStart = RCSetStartTable[RC->getID()];\n"
      << "  return &RCSetsTable[SetListStart];\n"
      << "}\n\n";
+
+  OS << "/// Get the dimensions of register pressure impacted by this "
+     << "register unit.\n"
+     << "/// Returns a -1 terminated array of pressure set IDs\n"
+     << "const int* " << ClassName << "::\n"
+     << "getRegUnitPressureSets(unsigned RegUnit) const {\n";
+  OS << "  static const unsigned RUSetStartTable[] = {\n    ";
+  for (unsigned UnitIdx = 0, UnitEnd = RegBank.getNumNativeRegUnits();
+       UnitIdx < UnitEnd; ++UnitIdx) {
+    OS << RCSetStarts[RegBank.getRegUnit(UnitIdx).RegClassUnitSetsIdx] << ",";
+  }
+  OS << "0 };\n"
+     << "  unsigned SetListStart = RUSetStartTable[RegUnit];\n"
+     << "  return &RCSetsTable[SetListStart];\n"
+     << "}\n\n";
 }
 
 void
@@ -907,11 +965,13 @@ RegisterInfoEmitter::runTargetHeader(raw_ostream &OS, CodeGenTarget &Target,
   }
   OS << "  virtual const RegClassWeight &getRegClassWeight("
      << "const TargetRegisterClass *RC) const;\n"
+     << "  virtual unsigned getRegUnitWeight(unsigned RegUnit) const;\n"
      << "  virtual unsigned getNumRegPressureSets() const;\n"
      << "  virtual const char *getRegPressureSetName(unsigned Idx) const;\n"
      << "  virtual unsigned getRegPressureSetLimit(unsigned Idx) const;\n"
      << "  virtual const int *getRegClassPressureSets("
      << "const TargetRegisterClass *RC) const;\n"
+     << "  virtual const int *getRegUnitPressureSets(unsigned RegUnit) const;\n"
      << "};\n\n";
 
   ArrayRef<CodeGenRegisterClass*> RegisterClasses = RegBank.getRegClasses();