Change all self assignments X=X to (void)X, so that we can turn on a

new gcc warning that complains on self-assignments and
self-initializations.

llvm-svn: 122458

4 files changed, 9 insertions, 9 deletions

diff --git a/llvm/lib/CodeGen/RegAllocLinearScan.cpp b/llvm/lib/CodeGen/RegAllocLinearScan.cpp
index 0875257550b..b18f62be005 100644
--- a/llvm/lib/CodeGen/RegAllocLinearScan.cpp
+++ b/llvm/lib/CodeGen/RegAllocLinearScan.cpp
@@ -934,7 +934,7 @@ LiveInterval *RALinScan::hasNextReloadInterval(LiveInterval *cur) {
 
 void RALinScan::DowngradeRegister(LiveInterval *li, unsigned Reg) {
   bool isNew = DowngradedRegs.insert(Reg);
-  isNew = isNew; // Silence compiler warning.
+  (void)isNew; // Silence compiler warning.
   assert(isNew && "Multiple reloads holding the same register?");
   DowngradeMap.insert(std::make_pair(li->reg, Reg));
   for (const unsigned *AS = tri_->getAliasSet(Reg); *AS; ++AS) {
diff --git a/llvm/lib/CodeGen/ScheduleDAGEmit.cpp b/llvm/lib/CodeGen/ScheduleDAGEmit.cpp
index 0a2fb3796a4..6b7a8c6491b 100644
--- a/llvm/lib/CodeGen/ScheduleDAGEmit.cpp
+++ b/llvm/lib/CodeGen/ScheduleDAGEmit.cpp
@@ -57,7 +57,7 @@ void ScheduleDAG::EmitPhysRegCopy(SUnit *SU,
       assert(I->getReg() && "Unknown physical register!");
       unsigned VRBase = MRI.createVirtualRegister(SU->CopyDstRC);
       bool isNew = VRBaseMap.insert(std::make_pair(SU, VRBase)).second;
-      isNew = isNew; // Silence compiler warning.
+      (void)isNew; // Silence compiler warning.
       assert(isNew && "Node emitted out of order - early");
       BuildMI(*BB, InsertPos, DebugLoc(), TII->get(TargetOpcode::COPY), VRBase)
         .addReg(I->getReg());
diff --git a/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp b/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
index c334cf8cf4d..3402b9fd072 100644
--- a/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp
@@ -67,7 +67,7 @@ EmitCopyFromReg(SDNode *Node, unsigned ResNo, bool IsClone, bool IsCloned,
     if (IsClone)
       VRBaseMap.erase(Op);
     bool isNew = VRBaseMap.insert(std::make_pair(Op, SrcReg)).second;
-    isNew = isNew; // Silence compiler warning.
+    (void)isNew; // Silence compiler warning.
     assert(isNew && "Node emitted out of order - early");
     return;
   }
@@ -150,7 +150,7 @@ EmitCopyFromReg(SDNode *Node, unsigned ResNo, bool IsClone, bool IsCloned,
   if (IsClone)
     VRBaseMap.erase(Op);
   bool isNew = VRBaseMap.insert(std::make_pair(Op, VRBase)).second;
-  isNew = isNew; // Silence compiler warning.
+  (void)isNew; // Silence compiler warning.
   assert(isNew && "Node emitted out of order - early");
 }
 
@@ -224,7 +224,7 @@ void InstrEmitter::CreateVirtualRegisters(SDNode *Node, MachineInstr *MI,
     if (IsClone)
       VRBaseMap.erase(Op);
     bool isNew = VRBaseMap.insert(std::make_pair(Op, VRBase)).second;
-    isNew = isNew; // Silence compiler warning.
+    (void)isNew; // Silence compiler warning.
     assert(isNew && "Node emitted out of order - early");
   }
 }
@@ -496,7 +496,7 @@ void InstrEmitter::EmitSubregNode(SDNode *Node,
      
   SDValue Op(Node, 0);
   bool isNew = VRBaseMap.insert(std::make_pair(Op, VRBase)).second;
-  isNew = isNew; // Silence compiler warning.
+  (void)isNew; // Silence compiler warning.
   assert(isNew && "Node emitted out of order - early");
 }
 
@@ -518,7 +518,7 @@ InstrEmitter::EmitCopyToRegClassNode(SDNode *Node,
 
   SDValue Op(Node, 0);
   bool isNew = VRBaseMap.insert(std::make_pair(Op, NewVReg)).second;
-  isNew = isNew; // Silence compiler warning.
+  (void)isNew; // Silence compiler warning.
   assert(isNew && "Node emitted out of order - early");
 }
 
@@ -555,7 +555,7 @@ void InstrEmitter::EmitRegSequence(SDNode *Node,
   MBB->insert(InsertPos, MI);
   SDValue Op(Node, 0);
   bool isNew = VRBaseMap.insert(std::make_pair(Op, NewVReg)).second;
-  isNew = isNew; // Silence compiler warning.
+  (void)isNew; // Silence compiler warning.
   assert(isNew && "Node emitted out of order - early");
 }
 
diff --git a/llvm/lib/CodeGen/StackSlotColoring.cpp b/llvm/lib/CodeGen/StackSlotColoring.cpp
index 9b7f553ed41..4a6ae60b9a8 100644
--- a/llvm/lib/CodeGen/StackSlotColoring.cpp
+++ b/llvm/lib/CodeGen/StackSlotColoring.cpp
@@ -646,7 +646,7 @@ StackSlotColoring::UnfoldAndRewriteInstruction(MachineInstr *MI, int OldFI,
   } else {
     SmallVector<MachineInstr*, 4> NewMIs;
     bool Success = TII->unfoldMemoryOperand(MF, MI, Reg, false, false, NewMIs);
-    Success = Success; // Silence compiler warning.
+    (void)Success; // Silence compiler warning.
     assert(Success && "Failed to unfold!");
     MachineInstr *NewMI = NewMIs[0];
     MBB->insert(MI, NewMI);