X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FCodeGen%2FLiveIntervalAnalysis.h;h=dc52c0a896c40a0ae4d049930f65c0be667fb8d5;hb=d6b76f9466f267ac5ec8ac0f3afa83da0d810490;hp=098262aa828a5415a29c1cfdef87d881050225a1;hpb=a955eabc7b080744e6af25a2c803aeafbf1940a4;p=oota-llvm.git

diff --git a/include/llvm/CodeGen/LiveIntervalAnalysis.h b/include/llvm/CodeGen/LiveIntervalAnalysis.h
index 098262aa828..dc52c0a896c 100644
--- a/include/llvm/CodeGen/LiveIntervalAnalysis.h
+++ b/include/llvm/CodeGen/LiveIntervalAnalysis.h
@@ -27,12 +27,15 @@
 #include "llvm/CodeGen/MachineFunctionPass.h"
 #include "llvm/CodeGen/SlotIndexes.h"
 #include "llvm/Support/Allocator.h"
+#include "llvm/Support/CommandLine.h"
 #include "llvm/Target/TargetRegisterInfo.h"
 #include <cmath>
 #include <iterator>
 
 namespace llvm {
 
+extern cl::opt<bool> UseSegmentSetForPhysRegs;
+
   class AliasAnalysis;
   class BitVector;
   class BlockFrequency;
@@ -377,7 +380,8 @@ namespace llvm {
       LiveRange *LR = RegUnitRanges[Unit];
       if (!LR) {
         // Compute missing ranges on demand.
-        RegUnitRanges[Unit] = LR = new LiveRange();
+        // Use segment set to speed-up initial computation of the live range.
+        RegUnitRanges[Unit] = LR = new LiveRange(UseSegmentSetForPhysRegs);
         computeRegUnitRange(*LR, Unit);
       }
       return *LR;
@@ -398,6 +402,10 @@ namespace llvm {
     /// of its subregisters.
     void removePhysRegDefAt(unsigned Reg, SlotIndex Pos);
 
+    /// Remove value number and related live segments of @p LI and its subranges
+    /// that start at position @p Pos.
+    void removeVRegDefAt(LiveInterval &LI, SlotIndex Pos);
+
   private:
     /// Compute live intervals for all virtual registers.
     void computeVirtRegs();