Add support for updating the LiveIntervals of registers used by 'exotic'

[oota-llvm.git] / lib / CodeGen / MachineBasicBlock.cpp

diff --git a/lib/CodeGen/MachineBasicBlock.cpp b/lib/CodeGen/MachineBasicBlock.cpp
index df1c7c2a66da24cd28190fc0900f1328dfa3f469..3d754366ee454f4e80373f6e3c996ba4d5ffe1cd 100644 (file)
--- a/lib/CodeGen/MachineBasicBlock.cpp
+++ b/lib/CodeGen/MachineBasicBlock.cpp
@@ -698,6 +698,24 @@ MachineBasicBlock::SplitCriticalEdge(MachineBasicBlock *Succ, Pass *P) {
       }
     }
 
+  SmallVector<unsigned, 4> UsedRegs;
+  if (LIS) {
+    for (instr_iterator I = getFirstInstrTerminator(), E = instr_end();
+         I != E; ++I) {
+      MachineInstr *MI = I;
+
+      for (MachineInstr::mop_iterator OI = MI->operands_begin(),
+           OE = MI->operands_end(); OI != OE; ++OI) {
+        if (!OI->isReg() || OI->getReg() == 0)
+          continue;
+
+        unsigned Reg = OI->getReg();
+        if (std::find(UsedRegs.begin(), UsedRegs.end(), Reg) == UsedRegs.end())
+          UsedRegs.push_back(Reg);
+      }
+    }
+  }
+
   ReplaceUsesOfBlockWith(Succ, NMBB);
 
   // If updateTerminator() removes instructions, we need to remove them from
@@ -830,6 +848,17 @@ MachineBasicBlock::SplitCriticalEdge(MachineBasicBlock *Succ, Pass *P) {
         LI.removeRange(StartIndex, EndIndex);
       }
     }
+
+    // Update all intervals for registers whose uses may have been modified by
+    // updateTerminator().
+    iterator FirstTerminator = getFirstTerminator();
+    MachineInstr *FirstTerminatorMI = FirstTerminator;
+    if (FirstTerminatorMI->isBundled())
+      FirstTerminatorMI = getBundleStart(FirstTerminatorMI);
+    reverse_iterator PreTerminators =
+      (FirstTerminator == begin()) ? rend()
+                                   : reverse_iterator(FirstTerminatorMI);
+    LIS->repairIntervalsInRange(this, rbegin(), PreTerminators, UsedRegs);
   }
 
   if (MachineDominatorTree *MDT =