From 0eefda1335f5e86f95dbb58352321a43237e1089 Mon Sep 17 00:00:00 2001
From: Anton Korobeynikov <asl@math.spbu.ru>
Date: Fri, 10 Oct 2008 20:28:10 +0000
Subject: [PATCH] Add rudimentary support for 'r' register operand

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57359 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/Sparc/SparcISelLowering.cpp | 52 ++++++++++++++++++++++++++
 lib/Target/Sparc/SparcISelLowering.h   | 29 ++++++++------
 2 files changed, 70 insertions(+), 11 deletions(-)

diff --git a/lib/Target/Sparc/SparcISelLowering.cpp b/lib/Target/Sparc/SparcISelLowering.cpp
index 25fef42df6d..dc06078e7b2 100644
--- a/lib/Target/Sparc/SparcISelLowering.cpp
+++ b/lib/Target/Sparc/SparcISelLowering.cpp
@@ -21,6 +21,7 @@
 #include "llvm/CodeGen/MachineInstrBuilder.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/SelectionDAG.h"
+#include "llvm/ADT/VectorExtras.h"
 using namespace llvm;
 
 
@@ -944,3 +945,54 @@ SparcTargetLowering::EmitInstrWithCustomInserter(MachineInstr *MI,
   F->DeleteMachineInstr(MI);   // The pseudo instruction is gone now.
   return BB;
 }
+
+//===----------------------------------------------------------------------===//
+//                         Sparc Inline Assembly Support
+//===----------------------------------------------------------------------===//
+
+/// getConstraintType - Given a constraint letter, return the type of
+/// constraint it is for this target.
+SparcTargetLowering::ConstraintType
+SparcTargetLowering::getConstraintType(const std::string &Constraint) const {
+  if (Constraint.size() == 1) {
+    switch (Constraint[0]) {
+    default:  break;
+    case 'r': return C_RegisterClass;
+    }
+  }
+
+  return TargetLowering::getConstraintType(Constraint);
+}
+
+std::pair<unsigned, const TargetRegisterClass*>
+SparcTargetLowering::getRegForInlineAsmConstraint(const std::string &Constraint,
+                                                  MVT VT) const {
+  if (Constraint.size() == 1) {
+    switch (Constraint[0]) {
+    case 'r':
+      return std::make_pair(0U, SP::IntRegsRegisterClass);
+    }
+  }
+
+  return TargetLowering::getRegForInlineAsmConstraint(Constraint, VT);
+}
+
+std::vector<unsigned> SparcTargetLowering::
+getRegClassForInlineAsmConstraint(const std::string &Constraint,
+                                  MVT VT) const {
+  if (Constraint.size() != 1)
+    return std::vector<unsigned>();
+
+  switch (Constraint[0]) {
+  default: break;
+  case 'r':
+    return make_vector<unsigned>(SP::L0, SP::L1, SP::L2, SP::L3,
+                                 SP::L4, SP::L5, SP::L6, SP::L7,
+                                 SP::I0, SP::I1, SP::I2, SP::I3,
+                                 SP::I4, SP::I5,
+                                 SP::O0, SP::O1, SP::O2, SP::O3,
+                                 SP::O4, SP::O5, SP::O7, 0);
+  }
+
+  return std::vector<unsigned>();
+}
diff --git a/lib/Target/Sparc/SparcISelLowering.h b/lib/Target/Sparc/SparcISelLowering.h
index d71f51c6e6c..ea3171d0276 100644
--- a/lib/Target/Sparc/SparcISelLowering.h
+++ b/lib/Target/Sparc/SparcISelLowering.h
@@ -28,41 +28,48 @@ namespace llvm {
       BRFCC,       // Branch to dest on fcc condition
       SELECT_ICC,  // Select between two values using the current ICC flags.
       SELECT_FCC,  // Select between two values using the current FCC flags.
-      
+
       Hi, Lo,      // Hi/Lo operations, typically on a global address.
-      
+
       FTOI,        // FP to Int within a FP register.
       ITOF,        // Int to FP within a FP register.
-      
+
       CALL,        // A call instruction.
       RET_FLAG     // Return with a flag operand.
     };
   }
-  
+
   class SparcTargetLowering : public TargetLowering {
     int VarArgsFrameOffset;   // Frame offset to start of varargs area.
   public:
     SparcTargetLowering(TargetMachine &TM);
     virtual SDValue LowerOperation(SDValue Op, SelectionDAG &DAG);
-    
+
     int getVarArgsFrameOffset() const { return VarArgsFrameOffset; }
-    
-    /// computeMaskedBitsForTargetNode - Determine which of the bits specified 
-    /// in Mask are known to be either zero or one and return them in the 
+
+    /// computeMaskedBitsForTargetNode - Determine which of the bits specified
+    /// in Mask are known to be either zero or one and return them in the
     /// KnownZero/KnownOne bitsets.
     virtual void computeMaskedBitsForTargetNode(const SDValue Op,
                                                 const APInt &Mask,
-                                                APInt &KnownZero, 
+                                                APInt &KnownZero,
                                                 APInt &KnownOne,
                                                 const SelectionDAG &DAG,
                                                 unsigned Depth = 0) const;
-    
+
     virtual void LowerArguments(Function &F, SelectionDAG &DAG,
                                 SmallVectorImpl<SDValue> &ArgValues);
     virtual MachineBasicBlock *EmitInstrWithCustomInserter(MachineInstr *MI,
                                                         MachineBasicBlock *MBB);
-    
+
     virtual const char *getTargetNodeName(unsigned Opcode) const;
+
+    ConstraintType getConstraintType(const std::string &Constraint) const;
+    std::pair<unsigned, const TargetRegisterClass*>
+    getRegForInlineAsmConstraint(const std::string &Constraint, MVT VT) const;
+    std::vector<unsigned>
+    getRegClassForInlineAsmConstraint(const std::string &Constraint,
+                                      MVT VT) const;
   };
 } // end namespace llvm