Add LiveIntervals::getLastSplitPoint().

A live range cannot be split everywhere in a basic block. A split must go before
the first terminator, and if the variable is live into a landing pad, the split
must happen before the call that can throw.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124894 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 10 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/LiveIntervalAnalysis.h b/include/llvm/CodeGen/LiveIntervalAnalysis.h
index e4fc062dc7..70f570212a 100644
--- a/include/llvm/CodeGen/LiveIntervalAnalysis.h
+++ b/include/llvm/CodeGen/LiveIntervalAnalysis.h
@@ -308,6 +308,12 @@ namespace llvm {
     /// within a single basic block.
     bool intervalIsInOneMBB(const LiveInterval &li) const;
 
+    /// getLastSplitPoint - Return the last possible insertion point in mbb for
+    /// spilling and splitting code. This is the first terminator, or the call
+    /// instruction if li is live into a landing pad successor.
+    MachineBasicBlock::iterator getLastSplitPoint(const LiveInterval &li,
+                                                  MachineBasicBlock *mbb);
+
   private:
     /// computeIntervals - Compute live intervals.
     void computeIntervals();
diff --git a/include/llvm/CodeGen/MachineBasicBlock.h b/include/llvm/CodeGen/MachineBasicBlock.h
index 16cb5c9ce8..1785451c7e 100644
--- a/include/llvm/CodeGen/MachineBasicBlock.h
+++ b/include/llvm/CodeGen/MachineBasicBlock.h
@@ -224,6 +224,10 @@ public:
   /// this basic block is entered via an exception handler.
   void setIsLandingPad() { IsLandingPad = true; }
 
+  /// getLandingPadSuccessor - If this block has a successor that is a landing
+  /// pad, return it. Otherwise return NULL.
+  const MachineBasicBlock *getLandingPadSuccessor() const;
+
   // Code Layout methods.
   
   /// moveBefore/moveAfter - move 'this' block before or after the specified