From a938ac6223c5fd315ab745086d843df5e0604e09 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Wed, 29 Jul 2009 20:43:05 +0000
Subject: [PATCH] make ptr_rc derive from a new PointerLikeRegClass tblgen
 class.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77503 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/llvm/Target/Target.td         | 12 +++++++++++-
 utils/TableGen/CodeGenDAGPatterns.cpp |  8 ++++----
 utils/TableGen/DAGISelEmitter.cpp     |  2 +-
 utils/TableGen/InstrInfoEmitter.cpp   |  2 +-
 4 files changed, 17 insertions(+), 7 deletions(-)

diff --git a/include/llvm/Target/Target.td b/include/llvm/Target/Target.td
index bdb5abb517a..a62036a5203 100644
--- a/include/llvm/Target/Target.td
+++ b/include/llvm/Target/Target.td
@@ -258,11 +258,21 @@ def ins;
 /// of operands.
 def variable_ops;
 
+
+/// PointerLikeRegClass - Values that are designed to have pointer width are
+/// derived from this.  TableGen treats the register class as having a symbolic
+/// type that it doesn't know, and resolves the actual regclass to use by using
+/// the TargetRegisterInfo::getPointerRegClass() hook at codegen time.
+class PointerLikeRegClass {
+
+}
+
+
 /// ptr_rc definition - Mark this operand as being a pointer value whose
 /// register class is resolved dynamically via a callback to TargetInstrInfo.
 /// FIXME: We should probably change this to a class which contain a list of
 /// flags. But currently we have but one flag.
-def ptr_rc;
+def ptr_rc : PointerLikeRegClass;
 
 /// unknown definition - Mark this operand as being of unknown type, causing
 /// it to be resolved by inference in the context it is used.
diff --git a/utils/TableGen/CodeGenDAGPatterns.cpp b/utils/TableGen/CodeGenDAGPatterns.cpp
index 2289ae789bd..2423ff93a14 100644
--- a/utils/TableGen/CodeGenDAGPatterns.cpp
+++ b/utils/TableGen/CodeGenDAGPatterns.cpp
@@ -753,7 +753,7 @@ static std::vector<unsigned char> getImplicitType(Record *R, bool NotRegisters,
     std::vector<unsigned char>
     ComplexPat(1, TP.getDAGPatterns().getComplexPattern(R).getValueType());
     return ComplexPat;
-  } else if (R->getName() == "ptr_rc") {
+  } else if (R->isSubClassOf("PointerLikeRegClass")) {
     Other[0] = MVT::iPTR;
     return Other;
   } else if (R->getName() == "node" || R->getName() == "srcvalue" ||
@@ -924,7 +924,7 @@ bool TreePatternNode::ApplyTypeConstraints(TreePattern &TP, bool NotRegisters) {
     } else {
       Record *ResultNode = Inst.getResult(0);
       
-      if (ResultNode->getName() == "ptr_rc") {
+      if (ResultNode->isSubClassOf("PointerLikeRegClass")) {
         std::vector<unsigned char> VT;
         VT.push_back(MVT::iPTR);
         MadeChange = UpdateNodeType(VT, TP);
@@ -968,7 +968,7 @@ bool TreePatternNode::ApplyTypeConstraints(TreePattern &TP, bool NotRegisters) {
       } else if (OperandNode->isSubClassOf("Operand")) {
         VT = getValueType(OperandNode->getValueAsDef("Type"));
         MadeChange |= Child->UpdateNodeType(VT, TP);
-      } else if (OperandNode->getName() == "ptr_rc") {
+      } else if (OperandNode->isSubClassOf("PointerLikeRegClass")) {
         MadeChange |= Child->UpdateNodeType(MVT::iPTR, TP);
       } else if (OperandNode->getName() == "unknown") {
         MadeChange |= Child->UpdateNodeType(EMVT::isUnknown, TP);
@@ -1602,7 +1602,7 @@ FindPatternInputsAndOutputs(TreePattern *I, TreePatternNode *Pat,
       I->error("set destination should be a register!");
 
     if (Val->getDef()->isSubClassOf("RegisterClass") ||
-        Val->getDef()->getName() == "ptr_rc") {
+        Val->getDef()->isSubClassOf("PointerLikeRegClass")) {
       if (Dest->getName().empty())
         I->error("set destination must have a name!");
       if (InstResults.count(Dest->getName()))
diff --git a/utils/TableGen/DAGISelEmitter.cpp b/utils/TableGen/DAGISelEmitter.cpp
index 6ec8b46c06c..d953c13a561 100644
--- a/utils/TableGen/DAGISelEmitter.cpp
+++ b/utils/TableGen/DAGISelEmitter.cpp
@@ -698,7 +698,7 @@ public:
       if (DefInit *DI = dynamic_cast<DefInit*>(Child->getLeafValue())) {
         Record *LeafRec = DI->getDef();
         if (LeafRec->isSubClassOf("RegisterClass") || 
-            LeafRec->getName() == "ptr_rc") {
+            LeafRec->isSubClassOf("PointerLikeRegClass")) {
           // Handle register references.  Nothing to do here.
         } else if (LeafRec->isSubClassOf("Register")) {
           // Handle register references.
diff --git a/utils/TableGen/InstrInfoEmitter.cpp b/utils/TableGen/InstrInfoEmitter.cpp
index 4502da176f4..c0e441cc48b 100644
--- a/utils/TableGen/InstrInfoEmitter.cpp
+++ b/utils/TableGen/InstrInfoEmitter.cpp
@@ -100,7 +100,7 @@ InstrInfoEmitter::GetOperandInfo(const CodeGenInstruction &Inst) {
       Res += "0";
         
       // Ptr value whose register class is resolved via callback.
-      if (OpR->getName() == "ptr_rc")
+      if (OpR->isSubClassOf("PointerLikeRegClass"))
         Res += "|(1<<TOI::LookupPtrRegClass)";
 
       // Predicate operands.  Check to see if the original unexpanded operand