1 files changed, 0 insertions, 25 deletions
diff --git a/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp b/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
index 85c6eca..6a08304 100644
--- a/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/FunctionLoweringInfo.cpp
@@ -57,28 +57,6 @@ static bool isUsedOutsideOfDefiningBlock(const Instruction *I) {
   return false;
 }
 
-static ISD::NodeType getPreferredExtendForValue(const Value *V) {
-  // For the users of the source value being used for compare instruction, if
-  // the number of signed predicate is greater than unsigned predicate, we
-  // prefer to use SIGN_EXTEND.
-  //
-  // With this optimization, we would be able to reduce some redundant sign or
-  // zero extension instruction, and eventually more machine CSE opportunities
-  // can be exposed.
-  ISD::NodeType ExtendKind = ISD::ANY_EXTEND;
-  unsigned NumOfSigned = 0, NumOfUnsigned = 0;
-  for (const User *U : V->users()) {
-    if (const auto *CI = dyn_cast<CmpInst>(U)) {
-      NumOfSigned += CI->isSigned();
-      NumOfUnsigned += CI->isUnsigned();
-    }
-  }
-  if (NumOfSigned > NumOfUnsigned)
-    ExtendKind = ISD::SIGN_EXTEND;
-
-  return ExtendKind;
-}
-
 void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf,
                                SelectionDAG *DAG) {
   Fn = &fn;
@@ -233,9 +211,6 @@ void FunctionLoweringInfo::set(const Function &fn, MachineFunction &mf,
       if (isUsedOutsideOfDefiningBlock(&I))
         if (!isa<AllocaInst>(I) || !StaticAllocaMap.count(cast<AllocaInst>(&I)))
           InitializeRegForValue(&I);
-
-      // Decide the preferred extend type for a value.
-      PreferredExtendType[&I] = getPreferredExtendForValue(&I);
     }
   }