X-Git-Url: http://plrg.eecs.uci.edu/git/?a=blobdiff_plain;f=include%2Fllvm%2FCodeGen%2FLiveIntervalAnalysis.h;h=dc52c0a896c40a0ae4d049930f65c0be667fb8d5;hb=a480f88b3cb3de316b42e6b9e67a0aaeb9567d6e;hp=61c705e04d29be4b028c2dc54e5eec2c040a29b3;hpb=5a9462587d2c9b4b70519d8a368f5a61485c1ca3;p=oota-llvm.git

diff --git a/include/llvm/CodeGen/LiveIntervalAnalysis.h b/include/llvm/CodeGen/LiveIntervalAnalysis.h
index 61c705e04d2..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;
@@ -393,6 +397,15 @@ namespace llvm {
       return RegUnitRanges[Unit];
     }
 
+    /// Remove value numbers and related live segments starting at position
+    /// @p Pos that are part of any liverange of physical register @p Reg or one
+    /// 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();