vendor/llvm/llvm-r86025

1 files changed, 22 insertions, 0 deletions

diff --git a/lib/Target/PIC16/PIC16InstrInfo.cpp b/lib/Target/PIC16/PIC16InstrInfo.cpp
index 87bd3d9c7e63..2fb405e947ff 100644
--- a/lib/Target/PIC16/PIC16InstrInfo.cpp
+++ b/lib/Target/PIC16/PIC16InstrInfo.cpp
@@ -214,3 +214,25 @@ InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
   // returning NULL.
   return 0;
 }
+
+bool PIC16InstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
+                                   MachineBasicBlock *&TBB,
+                                   MachineBasicBlock *&FBB,
+                                   SmallVectorImpl<MachineOperand> &Cond,
+                                   bool AllowModify) const {
+  MachineBasicBlock::iterator I = MBB.end();
+  if (I == MBB.begin())
+    return true;
+
+  // Get the terminator instruction.
+  --I;
+  // Handle unconditional branches. If the unconditional branch's target is
+  // successor basic block then remove the unconditional branch. 
+  if (I->getOpcode() == PIC16::br_uncond  && AllowModify) {
+    if (MBB.isLayoutSuccessor(I->getOperand(0).getMBB())) {
+      TBB = 0;
+      I->eraseFromParent();
+    }
+  }
+  return true;
+}