From 8644af36903d933b6f9ae80d2d51b9e340c48452 Mon Sep 17 00:00:00 2001
From: Anton Korobeynikov <asl@math.spbu.ru>
Date: Sun, 3 May 2009 13:15:22 +0000
Subject: [PATCH] Add InsertBranch() hook for tail mergeing

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70754 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Target/MSP430/MSP430InstrInfo.cpp | 26 ++++++++++++++++++++++++++
 lib/Target/MSP430/MSP430InstrInfo.h   |  4 ++++
 2 files changed, 30 insertions(+)

diff --git a/lib/Target/MSP430/MSP430InstrInfo.cpp b/lib/Target/MSP430/MSP430InstrInfo.cpp
index 199a323bf2b..39c835d92f6 100644
--- a/lib/Target/MSP430/MSP430InstrInfo.cpp
+++ b/lib/Target/MSP430/MSP430InstrInfo.cpp
@@ -149,3 +149,29 @@ MSP430InstrInfo::restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
 
   return true;
 }
+
+unsigned
+MSP430InstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
+                              MachineBasicBlock *FBB,
+                            const SmallVectorImpl<MachineOperand> &Cond) const {
+  // FIXME this should probably have a DebugLoc operand
+  DebugLoc dl = DebugLoc::getUnknownLoc();
+
+  // Shouldn't be a fall through.
+  assert(TBB && "InsertBranch must not be told to insert a fallthrough");
+  assert((Cond.size() == 1 || Cond.size() == 0) &&
+         "MSP430 branch conditions have one component!");
+
+  if (Cond.empty()) {
+    // Unconditional branch?
+    assert(!FBB && "Unconditional branch with multiple successors!");
+    BuildMI(&MBB, dl, get(MSP430::JMP)).addMBB(TBB);
+    return 1;
+  }
+
+  // Conditional branch.
+  unsigned Count = 0;
+  assert(0 && "Implement conditional branches!");
+
+  return Count;
+}
diff --git a/lib/Target/MSP430/MSP430InstrInfo.h b/lib/Target/MSP430/MSP430InstrInfo.h
index 59133d98ce0..e07aacad9dc 100644
--- a/lib/Target/MSP430/MSP430InstrInfo.h
+++ b/lib/Target/MSP430/MSP430InstrInfo.h
@@ -73,6 +73,10 @@ public:
                                            MachineBasicBlock::iterator MI,
                                  const std::vector<CalleeSavedInfo> &CSI) const;
 
+  virtual unsigned InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
+                                MachineBasicBlock *FBB,
+                             const SmallVectorImpl<MachineOperand> &Cond) const;
+
 };
 
 }
-- 
2.34.1