[llvm-commits] [llvm] r67764 - /llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp

[Owen Anderson]

Author: resistor
Date: Thu Mar 26 13:53:38 2009
New Revision: 67764

URL: http://llvm.org/viewvc/llvm-project?rev=67764&view=rev
Log:
Don't assign a new stack slot if the pre-alloc splitter already assigned one.

Modified:
    llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp

Modified: llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp?rev=67764&r1=67763&r2=67764&view=diff

==============================================================================
--- llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp (original)
+++ llvm/trunk/lib/CodeGen/LiveIntervalAnalysis.cpp Thu Mar 26 13:53:38 2009
@@ -1973,8 +1973,15 @@
   }
 
   // One stack slot per live interval.
-  if (NeedStackSlot && vrm.getPreSplitReg(li.reg) == 0)
-    Slot = vrm.assignVirt2StackSlot(li.reg);
+  if (NeedStackSlot && vrm.getPreSplitReg(li.reg) == 0) {
+    if (vrm.getStackSlot(li.reg) == VirtRegMap::NO_STACK_SLOT)
+      Slot = vrm.assignVirt2StackSlot(li.reg);
+    
+    // This case only occurs when the prealloc splitter has already assigned
+    // a stack slot to this vreg.
+    else
+      Slot = vrm.getStackSlot(li.reg);
+  }
 
   // Create new intervals and rewrite defs and uses.
   for (LiveInterval::Ranges::const_iterator