[LV][SLP] Mark is_fpclass as vectorizable

[Nuullll]

Summary

This adds is_fpclass to the list of trivially vectorizable intrinsics, so that LV can vectorize it and SLP can vectorize/scalarize it.

Unlike other intrinsics, the signature of an is_fpclass doesn't use the return type as an overloaded type (i1 @llvm.is.fpclass.f32) -- the return element type is always i1 and the return vector width matches with the first operand.
This patch introduces a new utility function isVectorIntrinsicWithReturnOverloadType, to determine whether an intrinsic uses the return type as the first overloaded type.

Signed-off-by: Yilong Guo <[e-mail]>

[Nuullll]

Fix format and add a test.

[Nuullll]

Update commit message.

[Nuullll]

Add Signed-off.

[Nuullll]

Submit diff

[eopXD]

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

4185

I guess you will need the same change under VPlanRecipes::widenPredicateCallHelper too?

[eopXD]

llvm/include/llvm/Analysis/VectorUtils.h

325

I personally think OverloadReturnType makes more sense.

[eopXD]

Title should also add [Scalarizer]

[lebedev.ri]

I guess this makes sense.

[arsenm]

llvm/test/Transforms/SLPVectorizer/X86/intrinsic.ll

558

Should use opaque pointers

573

Should add tests where elements have different test masks

llvm/test/Transforms/Scalarizer/intrinsics.ll

165–169

Scalarizer is a separate patch

llvm/include/llvm/Analysis/VectorUtils.h

 /// Identifies if the vector form of the intrinsic has a scalar operand.
 bool isVectorIntrinsicWithScalarOpAtArg(Intrinsic::ID ID,
                                         unsigned ScalarOpdIdx);
 
 /// Identifies if the vector form of the intrinsic has a operand that has
 /// an overloaded type.
 bool isVectorIntrinsicWithOverloadTypeAtArg(Intrinsic::ID ID, unsigned OpdIdx);
 
+/// Identifies if the vector form of the intrinsic uses return type as the
+/// first overloaded type.
+bool isVectorIntrinsicWithReturnOverloadType(Intrinsic::ID ID);
+
 /// Returns intrinsic ID for call.
 /// For the input call instruction it finds mapping intrinsic and returns
 /// its intrinsic ID, in case it does not found it return not_intrinsic.
 Intrinsic::ID getVectorIntrinsicIDForCall(const CallInst *CI,
                                           const TargetLibraryInfo *TLI);
 
 /// Find the operand of the GEP that should be checked for consecutive
 /// stores. This ignores trailing indices that have no effect on the final

llvm/lib/Analysis/VectorUtils.cpp

bool llvm::isTriviallyVectorizable(Intrinsic::ID ID) {
   case Intrinsic::roundeven:
   case Intrinsic::pow:
   case Intrinsic::fma:
   case Intrinsic::fmuladd:
   case Intrinsic::powi:
   case Intrinsic::canonicalize:
   case Intrinsic::fptosi_sat:
   case Intrinsic::fptoui_sat:
+  case Intrinsic::is_fpclass:
     return true;
   default:
     return false;
   }
 }
 
 /// Identifies if the vector form of the intrinsic has a scalar operand.
 bool llvm::isVectorIntrinsicWithScalarOpAtArg(Intrinsic::ID ID,
                                               unsigned ScalarOpdIdx) {
   switch (ID) {
   case Intrinsic::abs:
   case Intrinsic::ctlz:
   case Intrinsic::cttz:
   case Intrinsic::powi:
+  case Intrinsic::is_fpclass:
     return (ScalarOpdIdx == 1);
   case Intrinsic::smul_fix:
   case Intrinsic::smul_fix_sat:
   case Intrinsic::umul_fix:
   case Intrinsic::umul_fix_sat:
     return (ScalarOpdIdx == 2);
   default:
     return false;
   }
 }
 
 bool llvm::isVectorIntrinsicWithOverloadTypeAtArg(Intrinsic::ID ID,
                                                   unsigned OpdIdx) {
   switch (ID) {
   case Intrinsic::fptosi_sat:
   case Intrinsic::fptoui_sat:
+  case Intrinsic::is_fpclass:
     return OpdIdx == 0;
   case Intrinsic::powi:
     return OpdIdx == 1;
   default:
     return false;
   }
 }
 
+bool llvm::isVectorIntrinsicWithReturnOverloadType(Intrinsic::ID ID) {
+  switch (ID) {
+  case Intrinsic::is_fpclass: // The return element type is i1 and the vector width of return type matches with the first operand.
+    return false;
+  default:
+    return true;
+  }
+}
+
 /// Returns intrinsic ID for call.
 /// For the input call instruction it finds mapping intrinsic and returns
 /// its ID, in case it does not found it return not_intrinsic.
 Intrinsic::ID llvm::getVectorIntrinsicIDForCall(const CallInst *CI,
                                                 const TargetLibraryInfo *TLI) {
   Intrinsic::ID ID = getIntrinsicForCallSite(*CI, TLI);
   if (ID == Intrinsic::not_intrinsic)
     return Intrinsic::not_intrinsic;

llvm/lib/Transforms/Scalar/Scalarizer.cpp

bool ScalarizerVisitor::splitCall(CallInst &CI) {
   unsigned NumArgs = CI.arg_size();
 
   ValueVector ScalarOperands(NumArgs);
   SmallVector<Scatterer, 8> Scattered(NumArgs);
 
   Scattered.resize(NumArgs);
 
   SmallVector<llvm::Type *, 3> Tys;
+  if (isVectorIntrinsicWithReturnOverloadType(ID))
     Tys.push_back(VT->getScalarType());
 
   // Assumes that any vector type has the same number of elements as the return
   // vector type, which is true for all current intrinsics.
   for (unsigned I = 0; I != NumArgs; ++I) {
     Value *OpI = CI.getOperand(I);
     if (OpI->getType()->isVectorTy()) {
       Scattered[I] = scatter(&CI, OpI);
       assert(Scattered[I].size() == NumElems && "mismatched call operands");

llvm/lib/Transforms/Vectorize/LoopVectorize.cpp

void InnerLoopVectorizer::widenCallInstruction(CallInst &CI, VPValue *Def,
   InstructionCost IntrinsicCost =
       ID ? Cost->getVectorIntrinsicCost(&CI, VF) : 0;
   bool UseVectorIntrinsic = ID && IntrinsicCost <= CallCost;
   assert((UseVectorIntrinsic || !NeedToScalarize) &&
          "Instruction should be scalarized elsewhere.");
   assert((IntrinsicCost.isValid() || CallCost.isValid()) &&
          "Either the intrinsic cost or vector call cost must be valid");
 
+  bool UseReturnOverloadType = isVectorIntrinsicWithReturnOverloadType(ID);
   for (unsigned Part = 0; Part < UF; ++Part) {
-    SmallVector<Type *, 2> TysForDecl = {CI.getType()};
+    SmallVector<Type *, 2> TysForDecl;
+    if (UseReturnOverloadType)
+      TysForDecl.push_back(CI.getType());
     SmallVector<Value *, 4> Args;
     for (const auto &I : enumerate(ArgOperands.operands())) {
       // Some intrinsics have a scalar argument - don't replace it with a
       // vector.
       Value *Arg;
       if (!UseVectorIntrinsic ||
           !isVectorIntrinsicWithScalarOpAtArg(ID, I.index()))
         Arg = State.get(I.value(), Part);
       else
         Arg = State.get(I.value(), VPIteration(0, 0));
       if (isVectorIntrinsicWithOverloadTypeAtArg(ID, I.index()))
         TysForDecl.push_back(Arg->getType());
       Args.push_back(Arg);
     }
 
     Function *VectorF;
     if (UseVectorIntrinsic) {
       // Use vector version of the intrinsic.
-      if (VF.isVector())
+      if (UseReturnOverloadType && VF.isVector())
         TysForDecl[0] = VectorType::get(CI.getType()->getScalarType(), VF);
       Module *M = State.Builder.GetInsertBlock()->getModule();
       VectorF = Intrinsic::getDeclaration(M, ID, TysForDecl);
       assert(VectorF && "Can't retrieve vector intrinsic.");
     } else {
       // Use vector version of the function call.
       const VFShape Shape = VFShape::get(CI, VF, false /*HasGlobalPred*/);
 #ifndef NDEBUG

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

case Instruction::Call: {
       Intrinsic::ID ID = getVectorIntrinsicIDForCall(CI, TLI);
 
       auto VecCallCosts = getVectorCallCosts(CI, VecTy, TTI, TLI);
       bool UseIntrinsic = ID != Intrinsic::not_intrinsic &&
                           VecCallCosts.first <= VecCallCosts.second;
 
       Value *ScalarArg = nullptr;
       std::vector<Value *> OpVecs;
-      SmallVector<Type *, 2> TysForDecl =
-          {FixedVectorType::get(CI->getType(), E->Scalars.size())};
+      SmallVector<Type *, 2> TysForDecl;
+      if (isVectorIntrinsicWithReturnOverloadType(IID))
+        TysForDecl.push_back(FixedVectorType::get(CI->getType(), E->Scalars.size()));
       for (int j = 0, e = CI->arg_size(); j < e; ++j) {
         ValueList OpVL;
         // Some intrinsics have scalar arguments. This argument should not be
         // vectorized.
         if (UseIntrinsic && isVectorIntrinsicWithScalarOpAtArg(IID, j)) {
           CallInst *CEI = cast<CallInst>(VL0);
           ScalarArg = CEI->getArgOperand(j);
           OpVecs.push_back(CEI->getArgOperand(j));

llvm/test/Transforms/SLPVectorizer/X86/intrinsic.ll

 }
 
 define void @vec_ctlz_i32_neg(i32* %a, i32* %b, i32* %c, i1) {
 ; CHECK-LABEL: @vec_ctlz_i32_neg(
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[I0:%.*]] = load i32, i32* [[A:%.*]], align 4
 ; CHECK-NEXT:    [[I1:%.*]] = load i32, i32* [[B:%.*]], align 4
 ; CHECK-NEXT:    [[ADD1:%.*]] = add i32 [[I0]], [[I1]]
-; CHECK-NEXT:    [[CALL1:%.*]] = tail call i32 @llvm.ctlz.i32(i32 [[ADD1]], i1 true) #[[ATTR3:[0-9]+]]
+; CHECK-NEXT:    [[CALL1:%.*]] = tail call i32 @llvm.ctlz.i32(i32 [[ADD1]], i1 true) #[[ATTR5:[0-9]+]]
 ; CHECK-NEXT:    [[ARRAYIDX2:%.*]] = getelementptr inbounds i32, i32* [[A]], i32 1
 ; CHECK-NEXT:    [[I2:%.*]] = load i32, i32* [[ARRAYIDX2]], align 4
 ; CHECK-NEXT:    [[ARRAYIDX3:%.*]] = getelementptr inbounds i32, i32* [[B]], i32 1
 ; CHECK-NEXT:    [[I3:%.*]] = load i32, i32* [[ARRAYIDX3]], align 4
 ; CHECK-NEXT:    [[ADD2:%.*]] = add i32 [[I2]], [[I3]]
-; CHECK-NEXT:    [[CALL2:%.*]] = tail call i32 @llvm.ctlz.i32(i32 [[ADD2]], i1 false) #[[ATTR3]]
+; CHECK-NEXT:    [[CALL2:%.*]] = tail call i32 @llvm.ctlz.i32(i32 [[ADD2]], i1 false) #[[ATTR5]]
 ; CHECK-NEXT:    [[ARRAYIDX4:%.*]] = getelementptr inbounds i32, i32* [[A]], i32 2
 ; CHECK-NEXT:    [[I4:%.*]] = load i32, i32* [[ARRAYIDX4]], align 4
 ; CHECK-NEXT:    [[ARRAYIDX5:%.*]] = getelementptr inbounds i32, i32* [[B]], i32 2
 ; CHECK-NEXT:    [[I5:%.*]] = load i32, i32* [[ARRAYIDX5]], align 4
 ; CHECK-NEXT:    [[ADD3:%.*]] = add i32 [[I4]], [[I5]]
-; CHECK-NEXT:    [[CALL3:%.*]] = tail call i32 @llvm.ctlz.i32(i32 [[ADD3]], i1 true) #[[ATTR3]]
+; CHECK-NEXT:    [[CALL3:%.*]] = tail call i32 @llvm.ctlz.i32(i32 [[ADD3]], i1 true) #[[ATTR5]]
 ; CHECK-NEXT:    [[ARRAYIDX6:%.*]] = getelementptr inbounds i32, i32* [[A]], i32 3
 ; CHECK-NEXT:    [[I6:%.*]] = load i32, i32* [[ARRAYIDX6]], align 4
 ; CHECK-NEXT:    [[ARRAYIDX7:%.*]] = getelementptr inbounds i32, i32* [[B]], i32 3
 ; CHECK-NEXT:    [[I7:%.*]] = load i32, i32* [[ARRAYIDX7]], align 4
 ; CHECK-NEXT:    [[ADD4:%.*]] = add i32 [[I6]], [[I7]]
-; CHECK-NEXT:    [[CALL4:%.*]] = tail call i32 @llvm.ctlz.i32(i32 [[ADD4]], i1 false) #[[ATTR3]]
+; CHECK-NEXT:    [[CALL4:%.*]] = tail call i32 @llvm.ctlz.i32(i32 [[ADD4]], i1 false) #[[ATTR5]]
 ; CHECK-NEXT:    store i32 [[CALL1]], i32* [[C:%.*]], align 4
 ; CHECK-NEXT:    [[ARRAYIDX8:%.*]] = getelementptr inbounds i32, i32* [[C]], i32 1
 ; CHECK-NEXT:    store i32 [[CALL2]], i32* [[ARRAYIDX8]], align 4
 ; CHECK-NEXT:    [[ARRAYIDX9:%.*]] = getelementptr inbounds i32, i32* [[C]], i32 2
 ; CHECK-NEXT:    store i32 [[CALL3]], i32* [[ARRAYIDX9]], align 4
 ; CHECK-NEXT:    [[ARRAYIDX10:%.*]] = getelementptr inbounds i32, i32* [[C]], i32 3
 ; CHECK-NEXT:    store i32 [[CALL4]], i32* [[ARRAYIDX10]], align 4
 ; CHECK-NEXT:    ret void

 }
 
 define void @vec_cttz_i32_neg(i32* %a, i32* %b, i32* %c, i1) {
 ; CHECK-LABEL: @vec_cttz_i32_neg(
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[I0:%.*]] = load i32, i32* [[A:%.*]], align 4
 ; CHECK-NEXT:    [[I1:%.*]] = load i32, i32* [[B:%.*]], align 4
 ; CHECK-NEXT:    [[ADD1:%.*]] = add i32 [[I0]], [[I1]]
-; CHECK-NEXT:    [[CALL1:%.*]] = tail call i32 @llvm.cttz.i32(i32 [[ADD1]], i1 true) #[[ATTR3]]
+; CHECK-NEXT:    [[CALL1:%.*]] = tail call i32 @llvm.cttz.i32(i32 [[ADD1]], i1 true) #[[ATTR5]]
 ; CHECK-NEXT:    [[ARRAYIDX2:%.*]] = getelementptr inbounds i32, i32* [[A]], i32 1
 ; CHECK-NEXT:    [[I2:%.*]] = load i32, i32* [[ARRAYIDX2]], align 4
 ; CHECK-NEXT:    [[ARRAYIDX3:%.*]] = getelementptr inbounds i32, i32* [[B]], i32 1
 ; CHECK-NEXT:    [[I3:%.*]] = load i32, i32* [[ARRAYIDX3]], align 4
 ; CHECK-NEXT:    [[ADD2:%.*]] = add i32 [[I2]], [[I3]]
-; CHECK-NEXT:    [[CALL2:%.*]] = tail call i32 @llvm.cttz.i32(i32 [[ADD2]], i1 false) #[[ATTR3]]
+; CHECK-NEXT:    [[CALL2:%.*]] = tail call i32 @llvm.cttz.i32(i32 [[ADD2]], i1 false) #[[ATTR5]]
 ; CHECK-NEXT:    [[ARRAYIDX4:%.*]] = getelementptr inbounds i32, i32* [[A]], i32 2
 ; CHECK-NEXT:    [[I4:%.*]] = load i32, i32* [[ARRAYIDX4]], align 4
 ; CHECK-NEXT:    [[ARRAYIDX5:%.*]] = getelementptr inbounds i32, i32* [[B]], i32 2
 ; CHECK-NEXT:    [[I5:%.*]] = load i32, i32* [[ARRAYIDX5]], align 4
 ; CHECK-NEXT:    [[ADD3:%.*]] = add i32 [[I4]], [[I5]]
-; CHECK-NEXT:    [[CALL3:%.*]] = tail call i32 @llvm.cttz.i32(i32 [[ADD3]], i1 true) #[[ATTR3]]
+; CHECK-NEXT:    [[CALL3:%.*]] = tail call i32 @llvm.cttz.i32(i32 [[ADD3]], i1 true) #[[ATTR5]]
 ; CHECK-NEXT:    [[ARRAYIDX6:%.*]] = getelementptr inbounds i32, i32* [[A]], i32 3
 ; CHECK-NEXT:    [[I6:%.*]] = load i32, i32* [[ARRAYIDX6]], align 4
 ; CHECK-NEXT:    [[ARRAYIDX7:%.*]] = getelementptr inbounds i32, i32* [[B]], i32 3
 ; CHECK-NEXT:    [[I7:%.*]] = load i32, i32* [[ARRAYIDX7]], align 4
 ; CHECK-NEXT:    [[ADD4:%.*]] = add i32 [[I6]], [[I7]]
-; CHECK-NEXT:    [[CALL4:%.*]] = tail call i32 @llvm.cttz.i32(i32 [[ADD4]], i1 false) #[[ATTR3]]
+; CHECK-NEXT:    [[CALL4:%.*]] = tail call i32 @llvm.cttz.i32(i32 [[ADD4]], i1 false) #[[ATTR5]]
 ; CHECK-NEXT:    store i32 [[CALL1]], i32* [[C:%.*]], align 4
 ; CHECK-NEXT:    [[ARRAYIDX8:%.*]] = getelementptr inbounds i32, i32* [[C]], i32 1
 ; CHECK-NEXT:    store i32 [[CALL2]], i32* [[ARRAYIDX8]], align 4
 ; CHECK-NEXT:    [[ARRAYIDX9:%.*]] = getelementptr inbounds i32, i32* [[C]], i32 2
 ; CHECK-NEXT:    store i32 [[CALL3]], i32* [[ARRAYIDX9]], align 4
 ; CHECK-NEXT:    [[ARRAYIDX10:%.*]] = getelementptr inbounds i32, i32* [[C]], i32 3
 ; CHECK-NEXT:    store i32 [[CALL4]], i32* [[ARRAYIDX10]], align 4
 ; CHECK-NEXT:    ret void

 
 
 define void @vec_powi_f32_neg(float* %a, float* %b, float* %c, i32 %P, i32 %Q) {
 ; CHECK-LABEL: @vec_powi_f32_neg(
 ; CHECK-NEXT:  entry:
 ; CHECK-NEXT:    [[I0:%.*]] = load float, float* [[A:%.*]], align 4
 ; CHECK-NEXT:    [[I1:%.*]] = load float, float* [[B:%.*]], align 4
 ; CHECK-NEXT:    [[ADD1:%.*]] = fadd float [[I0]], [[I1]]
-; CHECK-NEXT:    [[CALL1:%.*]] = tail call float @llvm.powi.f32.i32(float [[ADD1]], i32 [[P:%.*]]) #[[ATTR3]]
+; CHECK-NEXT:    [[CALL1:%.*]] = tail call float @llvm.powi.f32.i32(float [[ADD1]], i32 [[P:%.*]]) #[[ATTR5]]
 ; CHECK-NEXT:    [[ARRAYIDX2:%.*]] = getelementptr inbounds float, float* [[A]], i32 1
 ; CHECK-NEXT:    [[I2:%.*]] = load float, float* [[ARRAYIDX2]], align 4
 ; CHECK-NEXT:    [[ARRAYIDX3:%.*]] = getelementptr inbounds float, float* [[B]], i32 1
 ; CHECK-NEXT:    [[I3:%.*]] = load float, float* [[ARRAYIDX3]], align 4
 ; CHECK-NEXT:    [[ADD2:%.*]] = fadd float [[I2]], [[I3]]
-; CHECK-NEXT:    [[CALL2:%.*]] = tail call float @llvm.powi.f32.i32(float [[ADD2]], i32 [[Q:%.*]]) #[[ATTR3]]
+; CHECK-NEXT:    [[CALL2:%.*]] = tail call float @llvm.powi.f32.i32(float [[ADD2]], i32 [[Q:%.*]]) #[[ATTR5]]
 ; CHECK-NEXT:    [[ARRAYIDX4:%.*]] = getelementptr inbounds float, float* [[A]], i32 2
 ; CHECK-NEXT:    [[I4:%.*]] = load float, float* [[ARRAYIDX4]], align 4
 ; CHECK-NEXT:    [[ARRAYIDX5:%.*]] = getelementptr inbounds float, float* [[B]], i32 2
 ; CHECK-NEXT:    [[I5:%.*]] = load float, float* [[ARRAYIDX5]], align 4
 ; CHECK-NEXT:    [[ADD3:%.*]] = fadd float [[I4]], [[I5]]
-; CHECK-NEXT:    [[CALL3:%.*]] = tail call float @llvm.powi.f32.i32(float [[ADD3]], i32 [[P]]) #[[ATTR3]]
+; CHECK-NEXT:    [[CALL3:%.*]] = tail call float @llvm.powi.f32.i32(float [[ADD3]], i32 [[P]]) #[[ATTR5]]
 ; CHECK-NEXT:    [[ARRAYIDX6:%.*]] = getelementptr inbounds float, float* [[A]], i32 3
 ; CHECK-NEXT:    [[I6:%.*]] = load float, float* [[ARRAYIDX6]], align 4
 ; CHECK-NEXT:    [[ARRAYIDX7:%.*]] = getelementptr inbounds float, float* [[B]], i32 3
 ; CHECK-NEXT:    [[I7:%.*]] = load float, float* [[ARRAYIDX7]], align 4
 ; CHECK-NEXT:    [[ADD4:%.*]] = fadd float [[I6]], [[I7]]
-; CHECK-NEXT:    [[CALL4:%.*]] = tail call float @llvm.powi.f32.i32(float [[ADD4]], i32 [[Q]]) #[[ATTR3]]
+; CHECK-NEXT:    [[CALL4:%.*]] = tail call float @llvm.powi.f32.i32(float [[ADD4]], i32 [[Q]]) #[[ATTR5]]
 ; CHECK-NEXT:    store float [[CALL1]], float* [[C:%.*]], align 4
 ; CHECK-NEXT:    [[ARRAYIDX8:%.*]] = getelementptr inbounds float, float* [[C]], i32 1
 ; CHECK-NEXT:    store float [[CALL2]], float* [[ARRAYIDX8]], align 4
 ; CHECK-NEXT:    [[ARRAYIDX9:%.*]] = getelementptr inbounds float, float* [[C]], i32 2
 ; CHECK-NEXT:    store float [[CALL3]], float* [[ARRAYIDX9]], align 4
 ; CHECK-NEXT:    [[ARRAYIDX10:%.*]] = getelementptr inbounds float, float* [[C]], i32 3
 ; CHECK-NEXT:    store float [[CALL4]], float* [[ARRAYIDX10]], align 4
 ; CHECK-NEXT:    ret void
entry:
   store float %call2, float* %arrayidx8, align 4
   %arrayidx9 = getelementptr inbounds float, float* %c, i32 2
   store float %call3, float* %arrayidx9, align 4
   %arrayidx10 = getelementptr inbounds float, float* %c, i32 3
   store float %call4, float* %arrayidx10, align 4
   ret void
 
 }
+
+
+declare i1 @llvm.is.fpclass.f32(float, i32)
+
+define void @vec_is_fpclass(float* %a, float* %b, i32* %c) {
+; CHECK-LABEL: @vec_is_fpclass(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[TMP0:%.*]] = bitcast float* [[A:%.*]] to <4 x float>*
+; CHECK-NEXT:    [[TMP1:%.*]] = load <4 x float>, <4 x float>* [[TMP0]], align 4
+; CHECK-NEXT:    [[TMP2:%.*]] = bitcast float* [[B:%.*]] to <4 x float>*
+; CHECK-NEXT:    [[TMP3:%.*]] = load <4 x float>, <4 x float>* [[TMP2]], align 4
+; CHECK-NEXT:    [[TMP4:%.*]] = fadd <4 x float> [[TMP1]], [[TMP3]]
+; CHECK-NEXT:    [[TMP5:%.*]] = call <4 x i1> @llvm.is.fpclass.v4f32(<4 x float> [[TMP4]], i32 1)
+; CHECK-NEXT:    [[TMP6:%.*]] = zext <4 x i1> [[TMP5]] to <4 x i32>
+; CHECK-NEXT:    [[TMP7:%.*]] = bitcast i32* [[C:%.*]] to <4 x i32>*
+; CHECK-NEXT:    store <4 x i32> [[TMP6]], <4 x i32>* [[TMP7]], align 4
+; CHECK-NEXT:    ret void
+;
+entry:
+  %i0 = load float, float* %a, align 4
+  %i1 = load float, float* %b, align 4
+  %add1 = fadd float %i0, %i1
+  %call1 = tail call i1 @llvm.is.fpclass.f32(float %add1, i32 1)
+  %call1.ext = zext i1 %call1 to i32
+
+  %arrayidx2 = getelementptr inbounds float, float* %a, i32 1
+  %i2 = load float, float* %arrayidx2, align 4
+  %arrayidx3 = getelementptr inbounds float, float* %b, i32 1
+  %i3 = load float, float* %arrayidx3, align 4
+  %add2 = fadd float %i2, %i3
+  %call2 = tail call i1 @llvm.is.fpclass.f32(float %add2, i32 1)
+  %call2.ext = zext i1 %call2 to i32
+
+  %arrayidx4 = getelementptr inbounds float, float* %a, i32 2
+  %i4 = load float, float* %arrayidx4, align 4
+  %arrayidx5 = getelementptr inbounds float, float* %b, i32 2
+  %i5 = load float, float* %arrayidx5, align 4
+  %add3 = fadd float %i4, %i5
+  %call3 = tail call i1 @llvm.is.fpclass.f32(float %add3, i32 1)
+  %call3.ext = zext i1 %call3 to i32
+
+  %arrayidx6 = getelementptr inbounds float, float* %a, i32 3
+  %i6 = load float, float* %arrayidx6, align 4
+  %arrayidx7 = getelementptr inbounds float, float* %b, i32 3
+  %i7 = load float, float* %arrayidx7, align 4
+  %add4 = fadd float %i6, %i7
+  %call4 = tail call i1 @llvm.is.fpclass.f32(float %add4, i32 1)
+  %call4.ext = zext i1 %call4 to i32
+
+  store i32 %call1.ext, i32* %c, align 4
+  %arrayidx8 = getelementptr inbounds i32, i32* %c, i32 1
+  store i32 %call2.ext, i32* %arrayidx8, align 4
+  %arrayidx9 = getelementptr inbounds i32, i32* %c, i32 2
+  store i32 %call3.ext, i32* %arrayidx9, align 4
+  %arrayidx10 = getelementptr inbounds i32, i32* %c, i32 3
+  store i32 %call4.ext, i32* %arrayidx10, align 4
+  ret void
+}

llvm/test/Transforms/Scalarizer/intrinsics.ll

 
 ; Binary int plus constant scalar operand
 declare <2 x i32> @llvm.smul.fix.sat.v2i32(<2 x i32>, <2 x i32>, i32)
 declare <2 x i32> @llvm.umul.fix.sat.v2i32(<2 x i32>, <2 x i32>, i32)
 
 declare <2 x i32> @llvm.fptosi.sat.v2i32.v2f32(<2 x float>)
 declare <2 x i32> @llvm.fptoui.sat.v2i32.v2f32(<2 x float>)
 
+; Unary fp plus constant scalar operand, plus non-overloaded return type
+declare <2 x i1> @llvm.is.fpclass.v2f32(<2 x float>, i32)
 
 ; CHECK-LABEL: @scalarize_sqrt_v2f32(
 ; CHECK: %sqrt.i0 = call float @llvm.sqrt.f32(float %x.i0)
 ; CHECK: %sqrt.i1 = call float @llvm.sqrt.f32(float %x.i1)
 ; CHECK: %sqrt.upto0 = insertelement <2 x float> poison, float %sqrt.i0, i32 0
 ; CHECK: %sqrt = insertelement <2 x float> %sqrt.upto0, float %sqrt.i1, i32 1
 ; CHECK: ret <2 x float> %sqrt
 define <2 x float> @scalarize_sqrt_v2f32(<2 x float> %x) #0 {

 ; CHECK: %sat.i1 = call i32 @llvm.fptoui.sat.i32.f32(float %x.i1)
 ; CHECK: %sat.upto0 = insertelement <2 x i32> poison, i32 %sat.i0, i32 0
 ; CHECK: %sat = insertelement <2 x i32> %sat.upto0, i32 %sat.i1, i32 1
 ; CHECK: ret <2 x i32> %sat
 define <2 x i32> @scalarize_fptoui_sat(<2 x float> %x) #0 {
   %sat = call <2 x i32> @llvm.fptoui.sat.v2i32.v2f32(<2 x float> %x)
   ret <2 x i32> %sat
 }
+
+; CHECK-LABEL: @scalarize_is_fpclass(
+; CHECK: %cond.i0 = call i1 @llvm.is.fpclass.f32(float %x.i0, i32 1)
+; CHECK: %cond.i1 = call i1 @llvm.is.fpclass.f32(float %x.i1, i32 1)
+; CHECK: %cond.upto0 = insertelement <2 x i1> poison, i1 %cond.i0, i32 0
+; CHECK: %cond = insertelement <2 x i1> %cond.upto0, i1 %cond.i1, i32 1
+; CHECK: ret <2 x i1> %cond
+define <2 x i1> @scalarize_is_fpclass(<2 x float> %x) {
+  %cond = call <2 x i1> @llvm.is.fpclass.v2f32(<2 x float> %x, i32 1)
+  ret <2 x i1> %cond
+}