SLPVectorizer: Rewrite ArrayRef slice compare to be more idiomatic.

NFC intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230965 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Vectorize/SLPVectorizer.cpp b/lib/Transforms/Vectorize/SLPVectorizer.cpp
index baf97418b56f10a1fd83733389fea443b7d2c6c2..f47d0089b1d6ea29061442ae96d19050bc0c1f95 100644 (file)
--- a/lib/Transforms/Vectorize/SLPVectorizer.cpp
+++ b/lib/Transforms/Vectorize/SLPVectorizer.cpp
@@ -3178,15 +3178,11 @@ private:
 /// the WeakVH array.
 /// Vectorization of part of the VL array may cause later values in the VL array
 /// to become invalid. We track when this has happened in the WeakVH array.
-static bool hasValueBeenRAUWed(ArrayRef<Value *> &VL,
-                               SmallVectorImpl<WeakVH> &VH,
-                               unsigned SliceBegin,
-                               unsigned SliceSize) {
-  for (unsigned i = SliceBegin; i < SliceBegin + SliceSize; ++i)
-    if (VH[i] != VL[i])
-      return true;
-
-  return false;
+static bool hasValueBeenRAUWed(ArrayRef<Value *> VL, ArrayRef<WeakVH> VH,
+                               unsigned SliceBegin, unsigned SliceSize) {
+  VL = VL.slice(SliceBegin, SliceSize);
+  VH = VH.slice(SliceBegin, SliceSize);
+  return !std::equal(VL.begin(), VL.end(), VH.begin());
 }
 
 bool SLPVectorizer::vectorizeStoreChain(ArrayRef<Value *> Chain,