[llvm] r247140 - Rename ExitCount to BackedgeTakenCount, because that's what it is.

[James Molloy via llvm-commits]

Author: jamesm
Date: Wed Sep  9 07:51:10 2015
New Revision: 247140

URL: http://llvm.org/viewvc/llvm-project?rev=247140&view=rev
Log:
Rename ExitCount to BackedgeTakenCount, because that's what it is.

We called a variable ExitCount, stored the backedge count in it, then redefined it to be the exit count again.

Modified:
    llvm/trunk/lib/Transforms/Vectorize/LoopVectorize.cpp

Modified: llvm/trunk/lib/Transforms/Vectorize/LoopVectorize.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Transforms/Vectorize/LoopVectorize.cpp?rev=247140&r1=247139&r2=247140&view=diff
==============================================================================
--- llvm/trunk/lib/Transforms/Vectorize/LoopVectorize.cpp (original)
+++ llvm/trunk/lib/Transforms/Vectorize/LoopVectorize.cpp Wed Sep  9 07:51:10 2015
@@ -2605,8 +2605,8 @@ Value *InnerLoopVectorizer::getOrCreateT
 
   IRBuilder<> Builder(L->getLoopPreheader()->getTerminator());
   // Find the loop boundaries.
-  const SCEV *ExitCount = SE->getBackedgeTakenCount(OrigLoop);
-  assert(ExitCount != SE->getCouldNotCompute() && "Invalid loop count");
+  const SCEV *BackedgeTakenCount = SE->getBackedgeTakenCount(OrigLoop);
+  assert(BackedgeTakenCount != SE->getCouldNotCompute() && "Invalid loop count");
 
   Type *IdxTy = Legal->getWidestInductionType();
   
@@ -2615,14 +2615,15 @@ Value *InnerLoopVectorizer::getOrCreateT
   // compare. The only way that we get a backedge taken count is that the
   // induction variable was signed and as such will not overflow. In such a case
   // truncation is legal.
-  if (ExitCount->getType()->getPrimitiveSizeInBits() >
+  if (BackedgeTakenCount->getType()->getPrimitiveSizeInBits() >
       IdxTy->getPrimitiveSizeInBits())
-    ExitCount = SE->getTruncateOrNoop(ExitCount, IdxTy);
-
-  const SCEV *BackedgeTakeCount = SE->getNoopOrZeroExtend(ExitCount, IdxTy);
+    BackedgeTakenCount = SE->getTruncateOrNoop(BackedgeTakenCount, IdxTy);
+  BackedgeTakenCount = SE->getNoopOrZeroExtend(BackedgeTakenCount, IdxTy);
+  
   // Get the total trip count from the count by adding 1.
-  ExitCount = SE->getAddExpr(BackedgeTakeCount,
-                             SE->getConstant(BackedgeTakeCount->getType(), 1));
+  const SCEV *ExitCount =
+    SE->getAddExpr(BackedgeTakenCount,
+                   SE->getConstant(BackedgeTakenCount->getType(), 1));
 
   const DataLayout &DL = L->getHeader()->getModule()->getDataLayout();