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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122458 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 3 insertions, 6 deletions

diff --git a/lib/Transforms/Scalar/MemCpyOptimizer.cpp b/lib/Transforms/Scalar/MemCpyOptimizer.cpp
index a92e848b84..6dcb49f935 100644
--- a/lib/Transforms/Scalar/MemCpyOptimizer.cpp
+++ b/lib/Transforms/Scalar/MemCpyOptimizer.cpp
@@ -504,7 +504,7 @@ bool MemCpyOpt::processStore(StoreInst *SI, BasicBlock::iterator &BBI) {
     DEBUG(dbgs() << "Replace stores:\n";
           for (unsigned i = 0, e = Range.TheStores.size(); i != e; ++i)
             dbgs() << *Range.TheStores[i] << '\n';
-          dbgs() << "With: " << *C << '\n'); C=C;
+          dbgs() << "With: " << *C << '\n'); (void)C;
   
     // Don't invalidate the iterator
     BBI = BI;
@@ -932,6 +932,3 @@ bool MemCpyOpt::runOnFunction(Function &F) {
   MD = 0;
   return MadeChange;
 }
-
-
-
diff --git a/lib/Transforms/Utils/AddrModeMatcher.cpp b/lib/Transforms/Utils/AddrModeMatcher.cpp
index b1cef96503..be7bed1cec 100644
--- a/lib/Transforms/Utils/AddrModeMatcher.cpp
+++ b/lib/Transforms/Utils/AddrModeMatcher.cpp
@@ -568,7 +568,7 @@ IsProfitableToFoldIntoAddressingMode(Instruction *I, ExtAddrMode &AMBefore,
                                   MemoryInst, Result);
     Matcher.IgnoreProfitability = true;
     bool Success = Matcher.MatchAddr(Address, 0);
-    Success = Success; assert(Success && "Couldn't select *anything*?");
+    (void)Success; assert(Success && "Couldn't select *anything*?");
 
     // If the match didn't cover I, then it won't be shared by it.
     if (std::find(MatchedAddrModeInsts.begin(), MatchedAddrModeInsts.end(),
diff --git a/lib/Transforms/Utils/DemoteRegToStack.cpp b/lib/Transforms/Utils/DemoteRegToStack.cpp
index 8e82a02caa..8cc26492c2 100644
--- a/lib/Transforms/Utils/DemoteRegToStack.cpp
+++ b/lib/Transforms/Utils/DemoteRegToStack.cpp
@@ -129,7 +129,7 @@ AllocaInst* llvm::DemotePHIToStack(PHINode *P, Instruction *AllocaPoint) {
   for (unsigned i = 0, e = P->getNumIncomingValues(); i < e; ++i) {
     if (InvokeInst *II = dyn_cast<InvokeInst>(P->getIncomingValue(i))) {
       assert(II->getParent() != P->getIncomingBlock(i) &&
-             "Invoke edge not supported yet"); II=II;
+             "Invoke edge not supported yet"); (void)II;
     }
     new StoreInst(P->getIncomingValue(i), Slot,
                   P->getIncomingBlock(i)->getTerminator());