Merge commit '8d20b5f9ff609e70fae5c865931ab0f29e639d9c'

Conflicts:
	lib/CodeGen/AsmPrinter/DwarfDebug.cpp
	lib/CodeGen/AsmPrinter/DwarfDebug.h
	lib/Target/ARM/MCTargetDesc/ARMAsmBackend.cpp
	lib/Target/Mips/MipsISelDAGToDAG.cpp
	lib/Target/Mips/MipsInstrFPU.td
	lib/Target/Mips/MipsSubtarget.cpp
	lib/Target/Mips/MipsSubtarget.h
	lib/Target/X86/X86MCInstLower.cpp
	tools/Makefile
	tools/llc/llc.cpp

1 files changed, 9 insertions, 6 deletions

diff --git a/lib/CodeGen/MachineBasicBlock.cpp b/lib/CodeGen/MachineBasicBlock.cpp
index 34b24b6085..667c7613d7 100644
--- a/lib/CodeGen/MachineBasicBlock.cpp
+++ b/lib/CodeGen/MachineBasicBlock.cpp
@@ -983,7 +983,6 @@ MachineBasicBlock::LivenessQueryResult
 MachineBasicBlock::computeRegisterLiveness(const TargetRegisterInfo *TRI,
                                            unsigned Reg, MachineInstr *MI,
                                            unsigned Neighborhood) {
-  
   unsigned N = Neighborhood;
   MachineBasicBlock *MBB = MI->getParent();
 
@@ -998,14 +997,18 @@ MachineBasicBlock::computeRegisterLiveness(const TargetRegisterInfo *TRI,
       MachineOperandIteratorBase::PhysRegInfo Analysis =
         MIOperands(I).analyzePhysReg(Reg, TRI);
 
-      if (Analysis.Kills)
+      if (Analysis.Defines)
+        // Outputs happen after inputs so they take precedence if both are
+        // present.
+        return Analysis.DefinesDead ? LQR_Dead : LQR_Live;
+
+      if (Analysis.Kills || Analysis.Clobbers)
         // Register killed, so isn't live.
         return LQR_Dead;
 
-      else if (Analysis.DefinesOverlap || Analysis.ReadsOverlap)
+      else if (Analysis.ReadsOverlap)
         // Defined or read without a previous kill - live.
-        return (Analysis.Defines || Analysis.Reads) ? 
-          LQR_Live : LQR_OverlappingLive;
+        return Analysis.Reads ? LQR_Live : LQR_OverlappingLive;
 
     } while (I != MBB->begin() && --N > 0);
   }
@@ -1037,7 +1040,7 @@ MachineBasicBlock::computeRegisterLiveness(const TargetRegisterInfo *TRI,
         return (Analysis.Reads) ?
           LQR_Live : LQR_OverlappingLive;
 
-      else if (Analysis.DefinesOverlap)
+      else if (Analysis.Clobbers || Analysis.Defines)
         // Defined (but not read) therefore cannot have been live.
         return LQR_Dead;
     }