forward() should not increment internal iterator. Its client may insert instruction between now and next forward() call.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34649 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 6 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/RegisterScavenging.h b/include/llvm/CodeGen/RegisterScavenging.h
index 117539a498..33d00a7443 100644
--- a/include/llvm/CodeGen/RegisterScavenging.h
+++ b/include/llvm/CodeGen/RegisterScavenging.h
@@ -27,6 +27,7 @@ class TargetRegisterClass;
 class RegScavenger {
   MachineBasicBlock *MBB;
   MachineBasicBlock::iterator MBBI;
+  bool MBBIInited;
   unsigned NumPhysRegs;
 
   /// RegStates - The current state of all the physical registers immediately
@@ -42,6 +43,11 @@ public:
   void forward();
   void backward();
 
+  /// forward / backward - Move the internal MBB iterator and update register
+  /// states until it has reached but not processed the specific iterator.
+  void forward(MachineBasicBlock::iterator I);
+  void backward(MachineBasicBlock::iterator I);
+
   /// isReserved - Returns true if a register is reserved. It is never "unused".
   bool isReserved(unsigned Reg) const { return ReservedRegs[Reg]; }