[LV] Pass kind and induction binop to emitTransformedIndex (NFC).

Explicitly pass InductionKind and InductionBinOp to
emitTransformedIndex. Only those values are needed from the induction
descriptor. This makes explicit what is needed for the function and
allows future use cases where the a full induction descriptor object is
not available.

Author: fhahn

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

@@ -2382,9 +2382,11 @@ static void buildScalarSteps(Value *ScalarIV, Value *Step,
 /// For pointer induction, returns StartValue[Index * StepValue].
 /// FIXME: The newly created binary instructions should contain nsw/nuw
 /// flags, which can be found from the original scalar operations.
-static Value *emitTransformedIndex(IRBuilderBase &B, Value *Index,
-                                   Value *StartValue, Value *Step,
-                                   const InductionDescriptor &ID) {
+static Value *
+emitTransformedIndex(IRBuilderBase &B, Value *Index, Value *StartValue,
+                     Value *Step,
+                     InductionDescriptor::InductionKind InductionKind,
+                     BinaryOperator *InductionBinOp) {
   Type *StepTy = Step->getType();
   Value *CastedIndex = StepTy->isIntegerTy()
                            ? B.CreateSExtOrTrunc(Index, StepTy)
@@ -2428,7 +2430,7 @@ static Value *emitTransformedIndex(IRBuilderBase &B, Value *Index,
     return B.CreateMul(X, Y);
   };
 
-  switch (ID.getKind()) {
+  switch (InductionKind) {
   case InductionDescriptor::IK_IntInduction: {
     assert(!isa<VectorType>(Index->getType()) &&
            "Vector indices not supported for integer inductions yet");
@@ -2446,7 +2448,6 @@ static Value *emitTransformedIndex(IRBuilderBase &B, Value *Index,
     assert(!isa<VectorType>(Index->getType()) &&
            "Vector indices not supported for FP inductions yet");
     assert(Step->getType()->isFloatingPointTy() && "Expected FP Step value");
-    auto InductionBinOp = ID.getInductionBinOp();
     assert(InductionBinOp &&
            (InductionBinOp->getOpcode() == Instruction::FAdd ||
             InductionBinOp->getOpcode() == Instruction::FSub) &&
@@ -3118,15 +3119,16 @@ PHINode *InnerLoopVectorizer::createInductionResumeValue(
     if (II.getInductionBinOp() && isa<FPMathOperator>(II.getInductionBinOp()))
       B.setFastMathFlags(II.getInductionBinOp()->getFastMathFlags());
 
-    EndValue =
-        emitTransformedIndex(B, VectorTripCount, II.getStartValue(), Step, II);
+    EndValue = emitTransformedIndex(B, VectorTripCount, II.getStartValue(),
+                                    Step, II.getKind(), II.getInductionBinOp());
     EndValue->setName("ind.end");
 
     // Compute the end value for the additional bypass (if applicable).
     if (AdditionalBypass.first) {
       B.SetInsertPoint(&(*AdditionalBypass.first->getFirstInsertionPt()));
-      EndValueFromAdditionalBypass = emitTransformedIndex(
-          B, AdditionalBypass.second, II.getStartValue(), Step, II);
+      EndValueFromAdditionalBypass =
+          emitTransformedIndex(B, AdditionalBypass.second, II.getStartValue(),
+                               Step, II.getKind(), II.getInductionBinOp());
       EndValueFromAdditionalBypass->setName("ind.end");
     }
   }
@@ -3340,7 +3342,8 @@ void InnerLoopVectorizer::fixupIVUsers(PHINode *OrigPhi,
       Value *Step = StepVPV->isLiveIn() ? StepVPV->getLiveInIRValue()
                                         : State.get(StepVPV, {0, 0});
       Value *Escape =
-          emitTransformedIndex(B, CountMinusOne, II.getStartValue(), Step, II);
+          emitTransformedIndex(B, CountMinusOne, II.getStartValue(), Step,
+                               II.getKind(), II.getInductionBinOp());
       Escape->setName("ind.escape");
       MissingVals[UI] = Escape;
     }
@@ -9408,7 +9411,8 @@ void VPWidenPointerInductionRecipe::execute(VPTransformState &State) {
 
         Value *Step = State.get(getOperand(1), VPIteration(Part, Lane));
         Value *SclrGep = emitTransformedIndex(
-            State.Builder, GlobalIdx, IndDesc.getStartValue(), Step, IndDesc);
+            State.Builder, GlobalIdx, IndDesc.getStartValue(), Step,
+            IndDesc.getKind(), IndDesc.getInductionBinOp());
         SclrGep->setName("next.gep");
         State.set(this, SclrGep, VPIteration(Part, Lane));
       }
@@ -9482,9 +9486,9 @@ void VPDerivedIVRecipe::execute(VPTransformState &State) {
 
   Value *Step = State.get(getStepValue(), VPIteration(0, 0));
   Value *CanonicalIV = State.get(getCanonicalIV(), VPIteration(0, 0));
-  Value *DerivedIV =
-      emitTransformedIndex(State.Builder, CanonicalIV,
-                           getStartValue()->getLiveInIRValue(), Step, IndDesc);
+  Value *DerivedIV = emitTransformedIndex(
+      State.Builder, CanonicalIV, getStartValue()->getLiveInIRValue(), Step,
+      IndDesc.getKind(), IndDesc.getInductionBinOp());
   DerivedIV->setName("offset.idx");
   if (ResultTy != DerivedIV->getType()) {
     assert(Step->getType()->isIntegerTy() &&