Teach the cost model about the optimization in r169904: Truncation of induction variables costs the same as scalar trunc.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170051 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 0 deletions

diff --git a/lib/Transforms/Vectorize/LoopVectorize.h b/lib/Transforms/Vectorize/LoopVectorize.h
index e5a5259605..e5ef29052e 100644
--- a/lib/Transforms/Vectorize/LoopVectorize.h
+++ b/lib/Transforms/Vectorize/LoopVectorize.h
@@ -320,6 +320,9 @@ public:
   /// Returns the induction variables found in the loop.
   InductionList *getInductionVars() { return &Inductions; }
 
+  /// Returns True if V is an induction variable in this loop.
+  bool isInductionVariable(const Value *V);
+
   /// Return true if the block BB needs to be predicated in order for the loop
   /// to be vectorized.
   bool blockNeedsPredication(BasicBlock *BB);