Replace std::copy with a back inserter with vector append where feasible

All of the cases were just appending from random access iterators to a
vector. Using insert/append can grow the vector to the perfect size
directly and moves the growing out of the loop. No intended functionalty
change.

llvm-svn: 230845

3 files changed, 8 insertions, 14 deletions

diff --git a/llvm/lib/CodeGen/Analysis.cpp b/llvm/lib/CodeGen/Analysis.cpp
index e50b846ddd8..8e11fe1c9cf 100644
--- a/llvm/lib/CodeGen/Analysis.cpp
+++ b/llvm/lib/CodeGen/Analysis.cpp
@@ -312,8 +312,7 @@ static const Value *getNoopInput(const Value *V,
       // previous aggregate. Combine the two paths to obtain the true address of
       // our element.
       ArrayRef<unsigned> ExtractLoc = EVI->getIndices();
-      std::copy(ExtractLoc.rbegin(), ExtractLoc.rend(),
-                std::back_inserter(ValLoc));
+      ValLoc.append(ExtractLoc.rbegin(), ExtractLoc.rend());
       NoopInput = Op;
     }
     // Terminate if we couldn't find anything to look through.
@@ -601,10 +600,8 @@ bool llvm::returnTypeIsEligibleForTailCall(const Function *F,
     // The manipulations performed when we're looking through an insertvalue or
     // an extractvalue would happen at the front of the RetPath list, so since
     // we have to copy it anyway it's more efficient to create a reversed copy.
-    using std::copy;
-    SmallVector<unsigned, 4> TmpRetPath, TmpCallPath;
-    copy(RetPath.rbegin(), RetPath.rend(), std::back_inserter(TmpRetPath));
-    copy(CallPath.rbegin(), CallPath.rend(), std::back_inserter(TmpCallPath));
+    SmallVector<unsigned, 4> TmpRetPath(RetPath.rbegin(), RetPath.rend());
+    SmallVector<unsigned, 4> TmpCallPath(CallPath.rbegin(), CallPath.rend());
 
     // Finally, we can check whether the value produced by the tail call at this
     // index is compatible with the value we return.
diff --git a/llvm/lib/CodeGen/IfConversion.cpp b/llvm/lib/CodeGen/IfConversion.cpp
index 7a295699cae..1a1f2a9d03c 100644
--- a/llvm/lib/CodeGen/IfConversion.cpp
+++ b/llvm/lib/CodeGen/IfConversion.cpp
@@ -1555,7 +1555,7 @@ void IfConverter::PredicateBlock(BBInfo &BBI,
     UpdatePredRedefs(I, Redefs);
   }
 
-  std::copy(Cond.begin(), Cond.end(), std::back_inserter(BBI.Predicate));
+  BBI.Predicate.append(Cond.begin(), Cond.end());
 
   BBI.IsAnalyzed = false;
   BBI.NonPredSize = 0;
@@ -1620,9 +1620,8 @@ void IfConverter::CopyAndPredicateBlock(BBInfo &ToBBI, BBInfo &FromBBI,
     }
   }
 
-  std::copy(FromBBI.Predicate.begin(), FromBBI.Predicate.end(),
-            std::back_inserter(ToBBI.Predicate));
-  std::copy(Cond.begin(), Cond.end(), std::back_inserter(ToBBI.Predicate));
+  ToBBI.Predicate.append(FromBBI.Predicate.begin(), FromBBI.Predicate.end());
+  ToBBI.Predicate.append(Cond.begin(), Cond.end());
 
   ToBBI.ClobbersPred |= FromBBI.ClobbersPred;
   ToBBI.IsAnalyzed = false;
@@ -1661,8 +1660,7 @@ void IfConverter::MergeBlocks(BBInfo &ToBBI, BBInfo &FromBBI, bool AddEdges) {
   if (NBB && !FromBBI.BB->isSuccessor(NBB))
     FromBBI.BB->addSuccessor(NBB);
 
-  std::copy(FromBBI.Predicate.begin(), FromBBI.Predicate.end(),
-            std::back_inserter(ToBBI.Predicate));
+  ToBBI.Predicate.append(FromBBI.Predicate.begin(), FromBBI.Predicate.end());
   FromBBI.Predicate.clear();
 
   ToBBI.NonPredSize += FromBBI.NonPredSize;
diff --git a/llvm/lib/CodeGen/PeepholeOptimizer.cpp b/llvm/lib/CodeGen/PeepholeOptimizer.cpp
index 283d1f26198..2800d846ff3 100644
--- a/llvm/lib/CodeGen/PeepholeOptimizer.cpp
+++ b/llvm/lib/CodeGen/PeepholeOptimizer.cpp
@@ -411,8 +411,7 @@ optimizeExtInstr(MachineInstr *MI, MachineBasicBlock *MBB,
 
   if (ExtendLife && !ExtendedUses.empty())
     // Extend the liveness of the extension result.
-    std::copy(ExtendedUses.begin(), ExtendedUses.end(),
-              std::back_inserter(Uses));
+    Uses.append(ExtendedUses.begin(), ExtendedUses.end());
 
   // Now replace all uses.
   bool Changed = false;