[llvm-commits] CVS: llvm/lib/CodeGen/LiveIntervals.cpp

[Alkis Evlogimenos]

Changes in directory llvm/lib/CodeGen:

LiveIntervals.cpp updated: 1.9 -> 1.10

---
Log message:

When a variable is killed and redifined in a basic block only one
killing instruction is tracked. This causes the LiveIntervals to
create bogus intervals. The workaound is to add a range to the
interval from the redefinition to the end of the basic block.


---
Diffs of the changes:  (+4 -1)

Index: llvm/lib/CodeGen/LiveIntervals.cpp
diff -u llvm/lib/CodeGen/LiveIntervals.cpp:1.9 llvm/lib/CodeGen/LiveIntervals.cpp:1.10
--- llvm/lib/CodeGen/LiveIntervals.cpp:1.9	Thu Dec 18 02:48:47 2003
+++ llvm/lib/CodeGen/LiveIntervals.cpp	Thu Dec 18 02:53:43 2003
@@ -152,11 +152,14 @@
     for (int i = 0, e = vi.Kills.size(); i != e; ++i) {
         MachineBasicBlock* killerBlock = vi.Kills[i].first;
         MachineInstr* killerInstr = vi.Kills[i].second;
-        killedInDefiningBasicBlock |= mbb == killerBlock;
         unsigned start = (mbb == killerBlock ?
                           instrIndex :
                           getInstructionIndex(killerBlock->front()));
         unsigned end = getInstructionIndex(killerInstr) + 1;
+        if (start < end) {
+            killedInDefiningBasicBlock |= mbb == killerBlock;
+            interval->addRange(start, end);
+        }
     }
 
     if (!killedInDefiningBasicBlock) {