[llvm] r304822 - [DAG] remove duplicated code for isOnlyUsedInZeroEqualityComparison(); NFCI

[Sanjay Patel via llvm-commits]

Author: spatel
Date: Tue Jun  6 14:40:09 2017
New Revision: 304822

URL: http://llvm.org/viewvc/llvm-project?rev=304822&view=rev
Log:
[DAG] remove duplicated code for isOnlyUsedInZeroEqualityComparison(); NFCI

Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp?rev=304822&r1=304821&r2=304822&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp Tue Jun  6 14:40:09 2017
@@ -5998,20 +5998,6 @@ void SelectionDAGBuilder::LowerCallTo(Im
   }
 }
 
-/// Return true if it only matters that the value is equal or not-equal to zero.
-static bool IsOnlyUsedInZeroEqualityComparison(const Value *V) {
-  for (const User *U : V->users()) {
-    if (const ICmpInst *IC = dyn_cast<ICmpInst>(U))
-      if (IC->isEquality())
-        if (const Constant *C = dyn_cast<Constant>(IC->getOperand(1)))
-          if (C->isNullValue())
-            continue;
-    // Unknown instruction.
-    return false;
-  }
-  return true;
-}
-
 static SDValue getMemCmpLoad(const Value *PtrVal, MVT LoadVT,
                              SelectionDAGBuilder &Builder) {
 
@@ -6098,7 +6084,7 @@ bool SelectionDAGBuilder::visitMemCmpCal
 
   // memcmp(S1,S2,2) != 0 -> (*(short*)LHS != *(short*)RHS)  != 0
   // memcmp(S1,S2,4) != 0 -> (*(int*)LHS != *(int*)RHS)  != 0
-  if (!CSize || !IsOnlyUsedInZeroEqualityComparison(&I))
+  if (!CSize || !isOnlyUsedInZeroEqualityComparison(&I))
     return false;
 
   // If the target has a fast compare for the given size, it will return a