[PATCH] LiveRangeCalc: Don't start liveranges of PHI instruction at the block begin.

[Phabricator]

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7779

Files:
  llvm/trunk/lib/CodeGen/LiveRangeCalc.cpp

Index: llvm/trunk/lib/CodeGen/LiveRangeCalc.cpp
===================================================================
--- llvm/trunk/lib/CodeGen/LiveRangeCalc.cpp
+++ llvm/trunk/lib/CodeGen/LiveRangeCalc.cpp
@@ -43,11 +43,8 @@
 static void createDeadDef(SlotIndexes &Indexes, VNInfo::Allocator &Alloc,
                           LiveRange &LR, const MachineOperand &MO) {
     const MachineInstr *MI = MO.getParent();
-    SlotIndex DefIdx;
-    if (MI->isPHI())
-      DefIdx = Indexes.getMBBStartIdx(MI->getParent());
-    else
-      DefIdx = Indexes.getInstructionIndex(MI).getRegSlot(MO.isEarlyClobber());
+    SlotIndex DefIdx =
+        Indexes.getInstructionIndex(MI).getRegSlot(MO.isEarlyClobber());
 
     // Create the def in LR. This may find an existing def.
     LR.createDeadDef(DefIdx, Alloc);

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