Fix spelling mistakes in Transforms comments. NFC.

Identified by Pedro Giffuni in PR27636.

llvm-svn: 287488

include/llvm/Transforms/Utils/LoopUtils.h

@@ -246,7 +246,7 @@ private:
   RecurrenceKind Kind;
   // If this a min/max recurrence the kind of recurrence.
   MinMaxRecurrenceKind MinMaxKind;
-  // First occurance of unasfe algebra in the PHI's use-chain.
+  // First occurrence of unasfe algebra in the PHI's use-chain.
   Instruction *UnsafeAlgebraInst;
   // The type of the recurrence.
   Type *RecurrenceType;

lib/Transforms/Coroutines/CoroFrame.cpp

@@ -66,9 +66,9 @@ public:
 // passes through a suspend point.
 //
 // For every basic block 'i' it maintains a BlockData that consists of:
-//   Consumes:  a bit vector which contains a set of indicies of blocks that can
+//   Consumes:  a bit vector which contains a set of indices of blocks that can
 //              reach block 'i'
-//   Kills: a bit vector which contains a set of indicies of blocks that can
+//   Kills: a bit vector which contains a set of indices of blocks that can
 //          reach block 'i', but one of the path will cross a suspend point
 //   Suspend: a boolean indicating whether block 'i' contains a suspend point.
 //   End: a boolean indicating whether block 'i' contains a coro.end intrinsic.

lib/Transforms/IPO/Inliner.cpp

@@ -177,7 +177,7 @@ static void mergeInlinedArrayAllocas(
                    << "\n\t\tINTO: " << *AvailableAlloca << '\n');
 
       // Move affected dbg.declare calls immediately after the new alloca to
-      // avoid the situation when a dbg.declare preceeds its alloca.
+      // avoid the situation when a dbg.declare precedes its alloca.
       if (auto *L = LocalAsMetadata::getIfExists(AI))
         if (auto *MDV = MetadataAsValue::getIfExists(AI->getContext(), L))
           for (User *U : MDV->users())

lib/Transforms/InstCombine/InstructionCombining.cpp

@@ -2576,7 +2576,7 @@ Instruction *InstCombiner::visitLandingPadInst(LandingPadInst &LI) {
           // remove it from the filter.  An unexpected type handler may be
           // set up for a call site which throws an exception of the same
           // type caught.  In order for the exception thrown by the unexpected
-          // handler to propogate correctly, the filter must be correctly
+          // handler to propagate correctly, the filter must be correctly
           // described for the call site.
           //
           // Example:

lib/Transforms/Scalar/ConstantHoisting.cpp

@@ -444,7 +444,7 @@ void ConstantHoistingPass::findBaseConstants() {
 
 /// \brief Updates the operand at Idx in instruction Inst with the result of
 ///        instruction Mat. If the instruction is a PHI node then special
-///        handling for duplicate values form the same incomming basic block is
+///        handling for duplicate values form the same incoming basic block is
 ///        required.
 /// \return The update will always succeed, but the return value indicated if
 ///         Mat was used for the update or not.

lib/Transforms/Scalar/IndVarSimplify.cpp

@@ -1635,7 +1635,7 @@ void WidenIV::calculatePostIncRange(Instruction *NarrowDef,
 
   BasicBlock *NarrowUserBB = NarrowUser->getParent();
   // If NarrowUserBB is statically unreachable asking dominator queries may 
-  // yield suprising results. (e.g. the block may not have a dom tree node)
+  // yield surprising results. (e.g. the block may not have a dom tree node)
   if (!DT->isReachableFromEntry(NarrowUserBB))
     return;
 

lib/Transforms/Scalar/JumpThreading.cpp

@@ -1603,7 +1603,7 @@ bool JumpThreadingPass::ThreadEdge(BasicBlock *BB,
 }
 
 /// Create a new basic block that will be the predecessor of BB and successor of
-/// all blocks in Preds. When profile data is availble, update the frequency of
+/// all blocks in Preds. When profile data is available, update the frequency of
 /// this new block.
 BasicBlock *JumpThreadingPass::SplitBlockPreds(BasicBlock *BB,
                                                ArrayRef<BasicBlock *> Preds,

lib/Transforms/Scalar/StructurizeCFG.cpp

@@ -141,7 +141,7 @@ public:
 /// Control flow is expressed as a branch where the true exit goes into the
 /// "Then"/"Else" region, while the false exit skips the region
 /// The condition for the optional "Else" region is expressed as a PHI node.
-/// The incomming values of the PHI node are true for the "If" edge and false
+/// The incoming values of the PHI node are true for the "If" edge and false
 /// for the "Then" edge.
 ///
 /// Additionally to that even complicated loops look like this:

lib/Transforms/Vectorize/SLPVectorizer.cpp

@@ -4436,7 +4436,7 @@ static Value *getReductionValue(const DominatorTree *DT, PHINode *P,
     return nullptr;
 
   // There is a loop latch, return the incoming value if it comes from
-  // that. This reduction pattern occassionaly turns up.
+  // that. This reduction pattern occasionally turns up.
   if (P->getIncomingBlock(0) == BBLatch) {
     Rdx = P->getIncomingValue(0);
   } else if (P->getIncomingBlock(1) == BBLatch) {