2 files changed, 12 insertions, 3 deletions
diff --git a/include/llvm/CodeGen/LiveInterval.h b/include/llvm/CodeGen/LiveInterval.h
index 512c94d87c..eb5901cf2f 100644
--- a/include/llvm/CodeGen/LiveInterval.h
+++ b/include/llvm/CodeGen/LiveInterval.h
@@ -569,6 +569,16 @@ namespace llvm {
     ///
     unsigned getSize() const;
 
+    /// isSpillable - Can this interval be spilled?
+    bool isSpillable() const {
+      return weight != HUGE_VALF;
+    }
+
+    /// markNotSpillable - Mark interval as not spillable
+    void markNotSpillable() {
+      weight = HUGE_VALF;
+    }
+
     /// ComputeJoinedWeight - Set the weight of a live interval after
     /// Other has been merged into it.
     void ComputeJoinedWeight(const LiveInterval &Other);
diff --git a/include/llvm/CodeGen/LiveIntervalAnalysis.h b/include/llvm/CodeGen/LiveIntervalAnalysis.h
index 294eb25fb2..e8856ac103 100644
--- a/include/llvm/CodeGen/LiveIntervalAnalysis.h
+++ b/include/llvm/CodeGen/LiveIntervalAnalysis.h
@@ -70,9 +70,8 @@ namespace llvm {
     static char ID; // Pass identification, replacement for typeid
     LiveIntervals() : MachineFunctionPass(&ID) {}
 
-    static float getSpillWeight(bool isDef, bool isUse, unsigned loopDepth) {
-      return (isDef + isUse) * powf(10.0F, (float)loopDepth);
-    }
+    // Calculate the spill weight to assign to a single instruction.
+    static float getSpillWeight(bool isDef, bool isUse, unsigned loopDepth);
 
     // After summing the spill weights of all defs and uses, the final weight
     // should be normalized, dividing the weight of the interval by its size.