From: Chris Lattner <sabre@nondot.org>
Date: Sat, 28 Oct 2006 17:35:02 +0000 (+0000)
Subject: implement the BlockHasNoFallThrough hook
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=ef13982aa7f3e57e82cd48370e79033dff0da295;p=oota-llvm.git

implement the BlockHasNoFallThrough hook


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31264 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/PowerPC/PPCInstrInfo.cpp b/lib/Target/PowerPC/PPCInstrInfo.cpp
index 63188466bed..9876e3cdad8 100644
--- a/lib/Target/PowerPC/PPCInstrInfo.cpp
+++ b/lib/Target/PowerPC/PPCInstrInfo.cpp
@@ -259,6 +259,17 @@ void PPCInstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
   BuildMI(&MBB, PPC::B, 1).addMBB(FBB);
 }
 
+bool PPCInstrInfo::BlockHasNoFallThrough(MachineBasicBlock &MBB) const {
+  if (MBB.empty()) return false;
+  
+  switch (MBB.back().getOpcode()) {
+  case PPC::B:     // Uncond branch.
+  case PPC::BCTR:  // Indirect branch.
+    return true;
+  default: return false;
+  }
+}
+
 bool PPCInstrInfo::
 ReverseBranchCondition(std::vector<MachineOperand> &Cond) const {
   assert(Cond.size() == 2 && "Invalid PPC branch opcode!");
diff --git a/lib/Target/PowerPC/PPCInstrInfo.h b/lib/Target/PowerPC/PPCInstrInfo.h
index dc16aed4dc2..769474b503d 100644
--- a/lib/Target/PowerPC/PPCInstrInfo.h
+++ b/lib/Target/PowerPC/PPCInstrInfo.h
@@ -110,6 +110,7 @@ public:
   virtual void InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
                             MachineBasicBlock *FBB,
                             const std::vector<MachineOperand> &Cond) const;
+  virtual bool BlockHasNoFallThrough(MachineBasicBlock &MBB) const;
   virtual bool ReverseBranchCondition(std::vector<MachineOperand> &Cond) const;