[llvm-commits] [llvm] r108023 - /llvm/trunk/lib/CodeGen/RegAllocFast.cpp

[Devang Patel]

Author: dpatel
Date: Fri Jul  9 16:48:31 2010
New Revision: 108023

URL: http://llvm.org/viewvc/llvm-project?rev=108023&view=rev
Log:
Update DBG_VALUE to refer appropriate stack slot in case of a spill.

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

Modified: llvm/trunk/lib/CodeGen/RegAllocFast.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/RegAllocFast.cpp?rev=108023&r1=108022&r2=108023&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/RegAllocFast.cpp (original)
+++ llvm/trunk/lib/CodeGen/RegAllocFast.cpp Fri Jul  9 16:48:31 2010
@@ -764,8 +764,25 @@
         LiveRegMap::iterator LRI = LiveVirtRegs.find(Reg);
         if (LRI != LiveVirtRegs.end())
           setPhysReg(MI, i, LRI->second.PhysReg);
-        else
-          MO.setReg(0); // We can't allocate a physreg for a DebugValue, sorry!
+        else {
+          int SS = StackSlotForVirtReg[Reg];
+          if (SS == -1)
+            MO.setReg(0); // We can't allocate a physreg for a DebugValue, sorry!
+          else {
+            // Modify DBG_VALUE now that the value is in a spill slot.
+            uint64_t Offset = MI->getOperand(1).getImm();
+            const MDNode *MDPtr = 
+              MI->getOperand(MI->getNumOperands()-1).getMetadata();
+            DebugLoc DL = MI->getDebugLoc();
+            if (MachineInstr *NewDV = 
+                TII->emitFrameIndexDebugValue(*MF, SS, Offset, MDPtr, DL)) {
+              DEBUG(dbgs() << "Modifying debug info due to spill:" << "\t" << *MI);
+              MachineBasicBlock *MBB = MI->getParent();
+              MBB->insert(MBB->erase(MI), NewDV);
+            } else
+              MO.setReg(0); // We can't allocate a physreg for a DebugValue, sorry!
+          }
+        }
       }
       // Next instruction.
       continue;