For PR786:

Turn on -Wunused and -Wno-unused-parameter. Clean up most of the resulting
fall out by removing unused variables. Remaining warnings have to do with
unused functions (I didn't want to delete code without review) and unused
variables in generated code. Maintainers should clean up the remaining
issues when they see them. All changes pass DejaGnu tests and Olden.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@31380 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Utils/SimplifyCFG.cpp

@@ -1340,7 +1340,7 @@ bool llvm::SimplifyCFG(BasicBlock *BB) {
         }
       }
     }
-  } else if (UnwindInst *UI = dyn_cast<UnwindInst>(BB->begin())) {
+  } else if (isa<UnwindInst>(BB->begin())) {
     // Check to see if the first instruction in this block is just an unwind.
     // If so, replace any invoke instructions which use this as an exception
     // destination with call instructions, and any unconditional branch
@@ -1409,7 +1409,7 @@ bool llvm::SimplifyCFG(BasicBlock *BB) {
           return 1;
       
     } else {  // Conditional branch
-      if (Value *CompVal = isValueEqualityComparison(BI)) {
+      if (isValueEqualityComparison(BI)) {
         // If we only have one predecessor, and if it is a branch on this value,
         // see if that predecessor totally determines the outcome of this
         // switch.
@@ -1764,7 +1764,6 @@ bool llvm::SimplifyCFG(BasicBlock *BB) {
 
   if (OnlySucc) {
     DEBUG(std::cerr << "Merging: " << *BB << "into: " << *OnlyPred);
-    TerminatorInst *Term = OnlyPred->getTerminator();
 
     // Resolve any PHI nodes at the start of the block.  They are all
     // guaranteed to have exactly one entry if they exist, unless there are