Add a Debug bit to MachineOperand, for uses that

are from debug info.  Add an iterator to MachineRegisterInfo
to skip Debug operands when walking the use list.  No
functional change yet.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95473 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 13 insertions, 1 deletions

diff --git a/include/llvm/CodeGen/MachineOperand.h b/include/llvm/CodeGen/MachineOperand.h
index 07d886d7d7..a4db391ea9 100644
--- a/include/llvm/CodeGen/MachineOperand.h
+++ b/include/llvm/CodeGen/MachineOperand.h
@@ -87,6 +87,10 @@ private:
   /// model the GCC inline asm '&' constraint modifier.
   bool IsEarlyClobber : 1;
 
+  /// IsDebug - True if this MO_Register 'use' operand is in a debug pseudo,
+  /// not a real instruction.  Such uses should be ignored during codegen.
+  bool IsDebug : 1;
+
   /// ParentMI - This is the instruction that this operand is embedded into. 
   /// This is valid for all operand types, when the operand is in an instr.
   MachineInstr *ParentMI;
@@ -214,6 +218,12 @@ public:
     return IsEarlyClobber;
   }
 
+  bool isDebug() const {
+    assert(isReg() && "Wrong MachineOperand accessor");
+    assert(!isDef() && "Wrong MachineOperand accessor");
+    return IsDebug;
+  }
+
   /// getNextOperandForReg - Return the next MachineOperand in the function that
   /// uses or defines this register.
   MachineOperand *getNextOperandForReg() const {
@@ -388,7 +398,8 @@ public:
                                   bool isKill = false, bool isDead = false,
                                   bool isUndef = false,
                                   bool isEarlyClobber = false,
-                                  unsigned SubReg = 0) {
+                                  unsigned SubReg = 0,
+                                  bool isDebug = false) {
     MachineOperand Op(MachineOperand::MO_Register);
     Op.IsDef = isDef;
     Op.IsImp = isImp;
@@ -396,6 +407,7 @@ public:
     Op.IsDead = isDead;
     Op.IsUndef = isUndef;
     Op.IsEarlyClobber = isEarlyClobber;
+    Op.IsDebug = isDebug;
     Op.Contents.Reg.RegNo = Reg;
     Op.Contents.Reg.Prev = 0;
     Op.Contents.Reg.Next = 0;