[SLP] Fix "gathering" of vector values

[anton-afanasyev]

Summary

For rare exceptional case vector tree node (insertelements for now only)
is marked as NeedToGather, this case is processed by patch. Follow-up
of D98714 to fix bug reported here https://reviews.llvm.org/D98714#2764135.

[xbolva00]

Add testcase?

[anton-afanasyev]

Add testcase (command crashed before)

[ABataev]

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

3693–3695

Not sure we should return 0 here, maybe better to return some max cost, like INT_MAX?

4596–4598

Is this correct? Need to return the last insertelement instruction in the sequence

llvm/test/Transforms/SLPVectorizer/X86/insert-element-build-vector-inseltpoison.ll

45–80

Why the check lines are removed?

[anton-afanasyev]

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

3693–3695

There is no difference for now (the only one is compile time). We could also just prohibit marking NeedToGather for vector node (it could be done while checking for ephemeral values only).

But I've done it this way since it looks more transparent and also we could use zero cost for the future cases when/if such NeedToGather vector node is not the only member of tree and whole tree vectorization is beneficial.

4596–4598

Sure, fixed!

llvm/test/Transforms/SLPVectorizer/X86/insert-element-build-vector-inseltpoison.ll

45–80

Fixed

[anton-afanasyev]

Address comments

[ABataev]

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

3693–3695

I think it is better to use TTI::TCC_Expensive to mark it explicitly as an expensive operation. Or even invalid cost, if possible.

[anton-afanasyev]

Address comment

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

3693–3695

Ok, used Invalid cost.
Deleted gathering code, since gathering isn't supposed now.

[ABataev]

llvm/test/Transforms/SLPVectorizer/X86/insert-element-build-vector-inseltpoison.ll

149–156

Why are the instructions reordered if no vectorization should happen?

[anton-afanasyev]

llvm/test/Transforms/SLPVectorizer/X86/insert-element-build-vector-inseltpoison.ll

149–156

Vectorization of inserts is prohibited now, yes, but compiler still "vectorizes" small trees of size 1 with any valid cost due to options -slp-threshold=-10000 -slp-min-tree-size=0. This is not related to this patch itself.

[ABataev]

LG

llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp

InstructionCost BoUpSLP::getEntryCost(const TreeEntry *E) {
   if (E->State == TreeEntry::NeedToGather) {
     if (allConstant(VL))
       return 0;
     if (isSplat(VL)) {
       return ReuseShuffleCost +
              TTI->getShuffleCost(TargetTransformInfo::SK_Broadcast, VecTy, None,
                                  0);
     }
+    if (isa<InsertElementInst>(VL[0]))
+      return InstructionCost::getInvalid();
     if (E->getOpcode() == Instruction::ExtractElement &&
         allSameType(VL) && allSameBlock(VL)) {
       SmallVector<int> Mask;
       Optional<TargetTransformInfo::ShuffleKind> ShuffleKind =
           isShuffle(VL, Mask);
       if (ShuffleKind.hasValue()) {
         InstructionCost Cost =
             computeExtractCost(VL, VecTy, *ShuffleKind, Mask, *TTI);
         AdjustExtractsCost(Cost, /*IsGather=*/true);
void BoUpSLP::setInsertPointAfterBundle(const TreeEntry *E) {
   // debug location to Front.
   Builder.SetInsertPoint(BB, ++LastInst->getIterator());
   Builder.SetCurrentDebugLocation(Front->getDebugLoc());
 }
 
 Value *BoUpSLP::gather(ArrayRef<Value *> VL) {
   Value *Val0 =
       isa<StoreInst>(VL[0]) ? cast<StoreInst>(VL[0])->getValueOperand() : VL[0];
   FixedVectorType *VecTy = FixedVectorType::get(Val0->getType(), VL.size());
   Value *Vec = PoisonValue::get(VecTy);
   unsigned InsIndex = 0;
   for (Value *Val : VL) {
     Vec = Builder.CreateInsertElement(Vec, Val, Builder.getInt32(InsIndex++));
     auto *InsElt = dyn_cast<InsertElementInst>(Vec);
     if (!InsElt)
       continue;
     GatherSeq.insert(InsElt);
     CSEBlocks.insert(InsElt->getParent());
     // Add to our 'need-to-extract' list.

llvm/test/Transforms/SLPVectorizer/X86/insert-element-build-vector-inseltpoison.ll

 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt -S -slp-vectorizer -slp-threshold=-10000 < %s | FileCheck %s
-; RUN: opt -S -slp-vectorizer -slp-threshold=0 < %s | FileCheck %s
+; RUN: opt -S -slp-vectorizer -slp-threshold=-10000 < %s | FileCheck %s --check-prefixes=CHECK,THRESHOLD
+; RUN: opt -S -slp-vectorizer -slp-threshold=0 < %s | FileCheck %s --check-prefixes=CHECK,NOTHRESHOLD
+; RUN: opt -S -slp-vectorizer -slp-threshold=-10000 -slp-min-tree-size=0 < %s | FileCheck %s --check-prefixes=CHECK,MINTREESIZE
 
 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-n8:16:32:64-S128"
 target triple = "x86_64-apple-macosx10.8.0"
 
 define <4 x float> @simple_select(<4 x float> %a, <4 x float> %b, <4 x i32> %c) #0 {
 ; CHECK-LABEL: @simple_select(
 ; CHECK-NEXT:    [[TMP1:%.*]] = icmp ne <4 x i32> [[C:%.*]], zeroinitializer
 ; CHECK-NEXT:    [[TMP2:%.*]] = select <4 x i1> [[TMP1]], <4 x float> [[A:%.*]], <4 x float> [[B:%.*]]
;
   %rd = insertelement <4 x float> %rc, float %s3, i32 3
   ret <4 x float> %rd
 }
 
 declare void @llvm.assume(i1) nounwind
 
 ; This entire tree is ephemeral, don't vectorize any of it.
 define <4 x float> @simple_select_eph(<4 x float> %a, <4 x float> %b, <4 x i32> %c) #0 {
-; CHECK-LABEL: @simple_select_eph(
-; CHECK-NEXT:    [[C0:%.*]] = extractelement <4 x i32> [[C:%.*]], i32 0
-; CHECK-NEXT:    [[C1:%.*]] = extractelement <4 x i32> [[C]], i32 1
-; CHECK-NEXT:    [[C2:%.*]] = extractelement <4 x i32> [[C]], i32 2
-; CHECK-NEXT:    [[C3:%.*]] = extractelement <4 x i32> [[C]], i32 3
-; CHECK-NEXT:    [[A0:%.*]] = extractelement <4 x float> [[A:%.*]], i32 0
-; CHECK-NEXT:    [[A1:%.*]] = extractelement <4 x float> [[A]], i32 1
-; CHECK-NEXT:    [[A2:%.*]] = extractelement <4 x float> [[A]], i32 2
-; CHECK-NEXT:    [[A3:%.*]] = extractelement <4 x float> [[A]], i32 3
-; CHECK-NEXT:    [[B0:%.*]] = extractelement <4 x float> [[B:%.*]], i32 0
-; CHECK-NEXT:    [[B1:%.*]] = extractelement <4 x float> [[B]], i32 1
-; CHECK-NEXT:    [[B2:%.*]] = extractelement <4 x float> [[B]], i32 2
-; CHECK-NEXT:    [[B3:%.*]] = extractelement <4 x float> [[B]], i32 3
-; CHECK-NEXT:    [[CMP0:%.*]] = icmp ne i32 [[C0]], 0
-; CHECK-NEXT:    [[CMP1:%.*]] = icmp ne i32 [[C1]], 0
-; CHECK-NEXT:    [[CMP2:%.*]] = icmp ne i32 [[C2]], 0
-; CHECK-NEXT:    [[CMP3:%.*]] = icmp ne i32 [[C3]], 0
-; CHECK-NEXT:    [[S0:%.*]] = select i1 [[CMP0]], float [[A0]], float [[B0]]
-; CHECK-NEXT:    [[S1:%.*]] = select i1 [[CMP1]], float [[A1]], float [[B1]]
-; CHECK-NEXT:    [[S2:%.*]] = select i1 [[CMP2]], float [[A2]], float [[B2]]
-; CHECK-NEXT:    [[S3:%.*]] = select i1 [[CMP3]], float [[A3]], float [[B3]]
-; CHECK-NEXT:    [[RA:%.*]] = insertelement <4 x float> poison, float [[S0]], i32 0
-; CHECK-NEXT:    [[RB:%.*]] = insertelement <4 x float> [[RA]], float [[S1]], i32 1
-; CHECK-NEXT:    [[RC:%.*]] = insertelement <4 x float> [[RB]], float [[S2]], i32 2
-; CHECK-NEXT:    [[RD:%.*]] = insertelement <4 x float> [[RC]], float [[S3]], i32 3
-; CHECK-NEXT:    [[Q0:%.*]] = extractelement <4 x float> [[RD]], i32 0
-; CHECK-NEXT:    [[Q1:%.*]] = extractelement <4 x float> [[RD]], i32 1
-; CHECK-NEXT:    [[Q2:%.*]] = extractelement <4 x float> [[RD]], i32 2
-; CHECK-NEXT:    [[Q3:%.*]] = extractelement <4 x float> [[RD]], i32 3
-; CHECK-NEXT:    [[Q4:%.*]] = fadd float [[Q0]], [[Q1]]
-; CHECK-NEXT:    [[Q5:%.*]] = fadd float [[Q2]], [[Q3]]
-; CHECK-NEXT:    [[Q6:%.*]] = fadd float [[Q4]], [[Q5]]
-; CHECK-NEXT:    [[QI:%.*]] = fcmp olt float [[Q6]], [[Q5]]
-; CHECK-NEXT:    call void @llvm.assume(i1 [[QI]])
-; CHECK-NEXT:    ret <4 x float> undef
+; THRESHOLD-LABEL: @simple_select_eph(
+; THRESHOLD-NEXT:    [[C0:%.*]] = extractelement <4 x i32> [[C:%.*]], i32 0
+; THRESHOLD-NEXT:    [[C1:%.*]] = extractelement <4 x i32> [[C]], i32 1
+; THRESHOLD-NEXT:    [[C2:%.*]] = extractelement <4 x i32> [[C]], i32 2
+; THRESHOLD-NEXT:    [[C3:%.*]] = extractelement <4 x i32> [[C]], i32 3
+; THRESHOLD-NEXT:    [[A0:%.*]] = extractelement <4 x float> [[A:%.*]], i32 0
+; THRESHOLD-NEXT:    [[A1:%.*]] = extractelement <4 x float> [[A]], i32 1
+; THRESHOLD-NEXT:    [[A2:%.*]] = extractelement <4 x float> [[A]], i32 2
+; THRESHOLD-NEXT:    [[A3:%.*]] = extractelement <4 x float> [[A]], i32 3
+; THRESHOLD-NEXT:    [[B0:%.*]] = extractelement <4 x float> [[B:%.*]], i32 0
+; THRESHOLD-NEXT:    [[B1:%.*]] = extractelement <4 x float> [[B]], i32 1
+; THRESHOLD-NEXT:    [[B2:%.*]] = extractelement <4 x float> [[B]], i32 2
+; THRESHOLD-NEXT:    [[B3:%.*]] = extractelement <4 x float> [[B]], i32 3
+; THRESHOLD-NEXT:    [[CMP0:%.*]] = icmp ne i32 [[C0]], 0
+; THRESHOLD-NEXT:    [[CMP1:%.*]] = icmp ne i32 [[C1]], 0
+; THRESHOLD-NEXT:    [[CMP2:%.*]] = icmp ne i32 [[C2]], 0
+; THRESHOLD-NEXT:    [[CMP3:%.*]] = icmp ne i32 [[C3]], 0
+; THRESHOLD-NEXT:    [[S0:%.*]] = select i1 [[CMP0]], float [[A0]], float [[B0]]
+; THRESHOLD-NEXT:    [[S1:%.*]] = select i1 [[CMP1]], float [[A1]], float [[B1]]
+; THRESHOLD-NEXT:    [[S2:%.*]] = select i1 [[CMP2]], float [[A2]], float [[B2]]
+; THRESHOLD-NEXT:    [[S3:%.*]] = select i1 [[CMP3]], float [[A3]], float [[B3]]
+; THRESHOLD-NEXT:    [[RA:%.*]] = insertelement <4 x float> poison, float [[S0]], i32 0
+; THRESHOLD-NEXT:    [[RB:%.*]] = insertelement <4 x float> [[RA]], float [[S1]], i32 1
+; THRESHOLD-NEXT:    [[RC:%.*]] = insertelement <4 x float> [[RB]], float [[S2]], i32 2
+; THRESHOLD-NEXT:    [[RD:%.*]] = insertelement <4 x float> [[RC]], float [[S3]], i32 3
+; THRESHOLD-NEXT:    [[Q0:%.*]] = extractelement <4 x float> [[RD]], i32 0
+; THRESHOLD-NEXT:    [[Q1:%.*]] = extractelement <4 x float> [[RD]], i32 1
+; THRESHOLD-NEXT:    [[Q2:%.*]] = extractelement <4 x float> [[RD]], i32 2
+; THRESHOLD-NEXT:    [[Q3:%.*]] = extractelement <4 x float> [[RD]], i32 3
+; THRESHOLD-NEXT:    [[Q4:%.*]] = fadd float [[Q0]], [[Q1]]
+; THRESHOLD-NEXT:    [[Q5:%.*]] = fadd float [[Q2]], [[Q3]]
+; THRESHOLD-NEXT:    [[Q6:%.*]] = fadd float [[Q4]], [[Q5]]
+; THRESHOLD-NEXT:    [[QI:%.*]] = fcmp olt float [[Q6]], [[Q5]]
+; THRESHOLD-NEXT:    call void @llvm.assume(i1 [[QI]])
+; THRESHOLD-NEXT:    ret <4 x float> undef
+;
+; NOTHRESHOLD-LABEL: @simple_select_eph(
+; NOTHRESHOLD-NEXT:    [[C0:%.*]] = extractelement <4 x i32> [[C:%.*]], i32 0
+; NOTHRESHOLD-NEXT:    [[C1:%.*]] = extractelement <4 x i32> [[C]], i32 1
+; NOTHRESHOLD-NEXT:    [[C2:%.*]] = extractelement <4 x i32> [[C]], i32 2
+; NOTHRESHOLD-NEXT:    [[C3:%.*]] = extractelement <4 x i32> [[C]], i32 3
+; NOTHRESHOLD-NEXT:    [[A0:%.*]] = extractelement <4 x float> [[A:%.*]], i32 0
+; NOTHRESHOLD-NEXT:    [[A1:%.*]] = extractelement <4 x float> [[A]], i32 1
+; NOTHRESHOLD-NEXT:    [[A2:%.*]] = extractelement <4 x float> [[A]], i32 2
+; NOTHRESHOLD-NEXT:    [[A3:%.*]] = extractelement <4 x float> [[A]], i32 3
+; NOTHRESHOLD-NEXT:    [[B0:%.*]] = extractelement <4 x float> [[B:%.*]], i32 0
+; NOTHRESHOLD-NEXT:    [[B1:%.*]] = extractelement <4 x float> [[B]], i32 1
+; NOTHRESHOLD-NEXT:    [[B2:%.*]] = extractelement <4 x float> [[B]], i32 2
+; NOTHRESHOLD-NEXT:    [[B3:%.*]] = extractelement <4 x float> [[B]], i32 3
+; NOTHRESHOLD-NEXT:    [[CMP0:%.*]] = icmp ne i32 [[C0]], 0
+; NOTHRESHOLD-NEXT:    [[CMP1:%.*]] = icmp ne i32 [[C1]], 0
+; NOTHRESHOLD-NEXT:    [[CMP2:%.*]] = icmp ne i32 [[C2]], 0
+; NOTHRESHOLD-NEXT:    [[CMP3:%.*]] = icmp ne i32 [[C3]], 0
+; NOTHRESHOLD-NEXT:    [[S0:%.*]] = select i1 [[CMP0]], float [[A0]], float [[B0]]
+; NOTHRESHOLD-NEXT:    [[S1:%.*]] = select i1 [[CMP1]], float [[A1]], float [[B1]]
+; NOTHRESHOLD-NEXT:    [[S2:%.*]] = select i1 [[CMP2]], float [[A2]], float [[B2]]
+; NOTHRESHOLD-NEXT:    [[S3:%.*]] = select i1 [[CMP3]], float [[A3]], float [[B3]]
+; NOTHRESHOLD-NEXT:    [[RA:%.*]] = insertelement <4 x float> poison, float [[S0]], i32 0
+; NOTHRESHOLD-NEXT:    [[RB:%.*]] = insertelement <4 x float> [[RA]], float [[S1]], i32 1
+; NOTHRESHOLD-NEXT:    [[RC:%.*]] = insertelement <4 x float> [[RB]], float [[S2]], i32 2
+; NOTHRESHOLD-NEXT:    [[RD:%.*]] = insertelement <4 x float> [[RC]], float [[S3]], i32 3
+; NOTHRESHOLD-NEXT:    [[Q0:%.*]] = extractelement <4 x float> [[RD]], i32 0
+; NOTHRESHOLD-NEXT:    [[Q1:%.*]] = extractelement <4 x float> [[RD]], i32 1
+; NOTHRESHOLD-NEXT:    [[Q2:%.*]] = extractelement <4 x float> [[RD]], i32 2
+; NOTHRESHOLD-NEXT:    [[Q3:%.*]] = extractelement <4 x float> [[RD]], i32 3
+; NOTHRESHOLD-NEXT:    [[Q4:%.*]] = fadd float [[Q0]], [[Q1]]
+; NOTHRESHOLD-NEXT:    [[Q5:%.*]] = fadd float [[Q2]], [[Q3]]
+; NOTHRESHOLD-NEXT:    [[Q6:%.*]] = fadd float [[Q4]], [[Q5]]
+; NOTHRESHOLD-NEXT:    [[QI:%.*]] = fcmp olt float [[Q6]], [[Q5]]
+; NOTHRESHOLD-NEXT:    call void @llvm.assume(i1 [[QI]])
+; NOTHRESHOLD-NEXT:    ret <4 x float> undef
+;
+; MINTREESIZE-LABEL: @simple_select_eph(
+; MINTREESIZE-NEXT:    [[C0:%.*]] = extractelement <4 x i32> [[C:%.*]], i32 0
+; MINTREESIZE-NEXT:    [[C1:%.*]] = extractelement <4 x i32> [[C]], i32 1
+; MINTREESIZE-NEXT:    [[C2:%.*]] = extractelement <4 x i32> [[C]], i32 2
+; MINTREESIZE-NEXT:    [[C3:%.*]] = extractelement <4 x i32> [[C]], i32 3
+; MINTREESIZE-NEXT:    [[A0:%.*]] = extractelement <4 x float> [[A:%.*]], i32 0
+; MINTREESIZE-NEXT:    [[A1:%.*]] = extractelement <4 x float> [[A]], i32 1
+; MINTREESIZE-NEXT:    [[A2:%.*]] = extractelement <4 x float> [[A]], i32 2
+; MINTREESIZE-NEXT:    [[A3:%.*]] = extractelement <4 x float> [[A]], i32 3
+; MINTREESIZE-NEXT:    [[B0:%.*]] = extractelement <4 x float> [[B:%.*]], i32 0
+; MINTREESIZE-NEXT:    [[B1:%.*]] = extractelement <4 x float> [[B]], i32 1
+; MINTREESIZE-NEXT:    [[B2:%.*]] = extractelement <4 x float> [[B]], i32 2
+; MINTREESIZE-NEXT:    [[B3:%.*]] = extractelement <4 x float> [[B]], i32 3
+; MINTREESIZE-NEXT:    [[CMP0:%.*]] = icmp ne i32 [[C0]], 0
+; MINTREESIZE-NEXT:    [[CMP1:%.*]] = icmp ne i32 [[C1]], 0
+; MINTREESIZE-NEXT:    [[CMP2:%.*]] = icmp ne i32 [[C2]], 0
+; MINTREESIZE-NEXT:    [[CMP3:%.*]] = icmp ne i32 [[C3]], 0
+; MINTREESIZE-NEXT:    [[S0:%.*]] = select i1 [[CMP0]], float [[A0]], float [[B0]]
+; MINTREESIZE-NEXT:    [[S1:%.*]] = select i1 [[CMP1]], float [[A1]], float [[B1]]
+; MINTREESIZE-NEXT:    [[S2:%.*]] = select i1 [[CMP2]], float [[A2]], float [[B2]]
+; MINTREESIZE-NEXT:    [[S3:%.*]] = select i1 [[CMP3]], float [[A3]], float [[B3]]
+; MINTREESIZE-NEXT:    [[RA:%.*]] = insertelement <4 x float> poison, float [[S0]], i32 0
+; MINTREESIZE-NEXT:    [[RB:%.*]] = insertelement <4 x float> [[RA]], float [[S1]], i32 1
+; MINTREESIZE-NEXT:    [[RC:%.*]] = insertelement <4 x float> [[RB]], float [[S2]], i32 2
+; MINTREESIZE-NEXT:    [[RD:%.*]] = insertelement <4 x float> [[RC]], float [[S3]], i32 3
+; MINTREESIZE-NEXT:    [[Q0:%.*]] = extractelement <4 x float> [[RD]], i32 0
+; MINTREESIZE-NEXT:    [[Q1:%.*]] = extractelement <4 x float> [[RD]], i32 1
+; MINTREESIZE-NEXT:    [[Q2:%.*]] = extractelement <4 x float> [[RD]], i32 2
+; MINTREESIZE-NEXT:    [[Q3:%.*]] = extractelement <4 x float> [[RD]], i32 3
+; MINTREESIZE-NEXT:    [[TMP1:%.*]] = insertelement <2 x float> poison, float [[Q2]], i32 0
+; MINTREESIZE-NEXT:    [[TMP2:%.*]] = insertelement <2 x float> [[TMP1]], float [[Q3]], i32 1
+; MINTREESIZE-NEXT:    [[Q4:%.*]] = fadd float [[Q0]], [[Q1]]
+; MINTREESIZE-NEXT:    [[Q5:%.*]] = fadd float [[Q2]], [[Q3]]
+; MINTREESIZE-NEXT:    [[TMP3:%.*]] = insertelement <2 x float> poison, float [[Q4]], i32 0
+; MINTREESIZE-NEXT:    [[TMP4:%.*]] = insertelement <2 x float> [[TMP3]], float [[Q5]], i32 1
+; MINTREESIZE-NEXT:    [[Q6:%.*]] = fadd float [[Q4]], [[Q5]]
+; MINTREESIZE-NEXT:    [[TMP5:%.*]] = insertelement <2 x float> poison, float [[Q6]], i32 0
+; MINTREESIZE-NEXT:    [[TMP6:%.*]] = insertelement <2 x float> [[TMP5]], float [[Q5]], i32 1
+; MINTREESIZE-NEXT:    [[QI:%.*]] = fcmp olt float [[Q6]], [[Q5]]
+; MINTREESIZE-NEXT:    call void @llvm.assume(i1 [[QI]])
+; MINTREESIZE-NEXT:    ret <4 x float> undef
 ;
   %c0 = extractelement <4 x i32> %c, i32 0
   %c1 = extractelement <4 x i32> %c, i32 1
   %c2 = extractelement <4 x i32> %c, i32 2
   %c3 = extractelement <4 x i32> %c, i32 3
   %a0 = extractelement <4 x float> %a, i32 0
   %a1 = extractelement <4 x float> %a, i32 1
   %a2 = extractelement <4 x float> %a, i32 2
   %a3 = extractelement <4 x float> %a, i32 3
;
   %10 = extractelement <2 x float> %8, i32 1
   %rb = insertelement <4 x float> %ra, float %10, i32 1
   ret <4 x float> %rb
 }
 
 ; Make sure that vectorization happens even if insertelements operations
 ; must be rescheduled. The case here is from compiling Julia.
 define <4 x float> @reschedule_extract(<4 x float> %a, <4 x float> %b) {
-; CHECK-LABEL: @reschedule_extract(
-; CHECK-NEXT:    [[TMP1:%.*]] = fadd <4 x float> [[A:%.*]], [[B:%.*]]
-; CHECK-NEXT:    ret <4 x float> [[TMP1]]
+; THRESHOLD-LABEL: @reschedule_extract(
+; THRESHOLD-NEXT:    [[TMP1:%.*]] = fadd <4 x float> [[A:%.*]], [[B:%.*]]
+; THRESHOLD-NEXT:    ret <4 x float> [[TMP1]]
+;
+; NOTHRESHOLD-LABEL: @reschedule_extract(
+; NOTHRESHOLD-NEXT:    [[TMP1:%.*]] = fadd <4 x float> [[A:%.*]], [[B:%.*]]
+; NOTHRESHOLD-NEXT:    ret <4 x float> [[TMP1]]
+;
+; MINTREESIZE-LABEL: @reschedule_extract(
+; MINTREESIZE-NEXT:    [[TMP1:%.*]] = extractelement <4 x float> [[B:%.*]], i32 3
+; MINTREESIZE-NEXT:    [[TMP2:%.*]] = extractelement <4 x float> [[B]], i32 2
+; MINTREESIZE-NEXT:    [[TMP3:%.*]] = extractelement <4 x float> [[B]], i32 1
+; MINTREESIZE-NEXT:    [[TMP4:%.*]] = extractelement <4 x float> [[B]], i32 0
+; MINTREESIZE-NEXT:    [[TMP5:%.*]] = extractelement <4 x float> [[A:%.*]], i32 3
+; MINTREESIZE-NEXT:    [[TMP6:%.*]] = extractelement <4 x float> [[A]], i32 2
+; MINTREESIZE-NEXT:    [[TMP7:%.*]] = extractelement <4 x float> [[A]], i32 1
+; MINTREESIZE-NEXT:    [[TMP8:%.*]] = extractelement <4 x float> [[A]], i32 0
+; MINTREESIZE-NEXT:    [[TMP9:%.*]] = insertelement <2 x float> poison, float [[TMP8]], i32 0
+; MINTREESIZE-NEXT:    [[TMP10:%.*]] = insertelement <2 x float> [[TMP9]], float [[TMP4]], i32 1
+; MINTREESIZE-NEXT:    [[TMP11:%.*]] = insertelement <2 x float> poison, float [[TMP7]], i32 0
+; MINTREESIZE-NEXT:    [[TMP12:%.*]] = insertelement <2 x float> [[TMP11]], float [[TMP3]], i32 1
+; MINTREESIZE-NEXT:    [[TMP13:%.*]] = insertelement <2 x float> poison, float [[TMP6]], i32 0
+; MINTREESIZE-NEXT:    [[TMP14:%.*]] = insertelement <2 x float> [[TMP13]], float [[TMP2]], i32 1
+; MINTREESIZE-NEXT:    [[TMP15:%.*]] = insertelement <2 x float> poison, float [[TMP5]], i32 0
+; MINTREESIZE-NEXT:    [[TMP16:%.*]] = insertelement <2 x float> [[TMP15]], float [[TMP1]], i32 1
+; MINTREESIZE-NEXT:    [[TMP17:%.*]] = fadd <4 x float> [[A]], [[B]]
+; MINTREESIZE-NEXT:    ret <4 x float> [[TMP17]]
 ;
   %a0 = extractelement <4 x float> %a, i32 0
   %b0 = extractelement <4 x float> %b, i32 0
   %c0 = fadd float %a0, %b0
   %v0 = insertelement <4 x float> poison, float %c0, i32 0
   %a1 = extractelement <4 x float> %a, i32 1
   %b1 = extractelement <4 x float> %b, i32 1
   %c1 = fadd float %a1, %b1
   %v1 = insertelement <4 x float> %v0, float %c1, i32 1
   %a2 = extractelement <4 x float> %a, i32 2
   %b2 = extractelement <4 x float> %b, i32 2
   %c2 = fadd float %a2, %b2
   %v2 = insertelement <4 x float> %v1, float %c2, i32 2
   %a3 = extractelement <4 x float> %a, i32 3
   %b3 = extractelement <4 x float> %b, i32 3
   %c3 = fadd float %a3, %b3
   %v3 = insertelement <4 x float> %v2, float %c3, i32 3
   ret <4 x float> %v3
 }
 
 ; Check that cost model for vectorization takes credit for
 ; instructions that are erased.
 define <4 x float> @take_credit(<4 x float> %a, <4 x float> %b) {
-; CHECK-LABEL: @take_credit(
-; CHECK-NEXT:    [[TMP1:%.*]] = fadd <4 x float> [[A:%.*]], [[B:%.*]]
-; CHECK-NEXT:    ret <4 x float> [[TMP1]]
+; THRESHOLD-LABEL: @take_credit(
+; THRESHOLD-NEXT:    [[TMP1:%.*]] = fadd <4 x float> [[A:%.*]], [[B:%.*]]
+; THRESHOLD-NEXT:    ret <4 x float> [[TMP1]]
+;
+; NOTHRESHOLD-LABEL: @take_credit(
+; NOTHRESHOLD-NEXT:    [[TMP1:%.*]] = fadd <4 x float> [[A:%.*]], [[B:%.*]]
+; NOTHRESHOLD-NEXT:    ret <4 x float> [[TMP1]]
+;
+; MINTREESIZE-LABEL: @take_credit(
+; MINTREESIZE-NEXT:    [[TMP1:%.*]] = extractelement <4 x float> [[B:%.*]], i32 3
+; MINTREESIZE-NEXT:    [[TMP2:%.*]] = extractelement <4 x float> [[B]], i32 2
+; MINTREESIZE-NEXT:    [[TMP3:%.*]] = extractelement <4 x float> [[B]], i32 1
+; MINTREESIZE-NEXT:    [[TMP4:%.*]] = extractelement <4 x float> [[B]], i32 0
+; MINTREESIZE-NEXT:    [[TMP5:%.*]] = extractelement <4 x float> [[A:%.*]], i32 3
+; MINTREESIZE-NEXT:    [[TMP6:%.*]] = extractelement <4 x float> [[A]], i32 2
+; MINTREESIZE-NEXT:    [[TMP7:%.*]] = extractelement <4 x float> [[A]], i32 1
+; MINTREESIZE-NEXT:    [[TMP8:%.*]] = extractelement <4 x float> [[A]], i32 0
+; MINTREESIZE-NEXT:    [[TMP9:%.*]] = insertelement <2 x float> poison, float [[TMP8]], i32 0
+; MINTREESIZE-NEXT:    [[TMP10:%.*]] = insertelement <2 x float> [[TMP9]], float [[TMP4]], i32 1
+; MINTREESIZE-NEXT:    [[TMP11:%.*]] = insertelement <2 x float> poison, float [[TMP7]], i32 0
+; MINTREESIZE-NEXT:    [[TMP12:%.*]] = insertelement <2 x float> [[TMP11]], float [[TMP3]], i32 1
+; MINTREESIZE-NEXT:    [[TMP13:%.*]] = insertelement <2 x float> poison, float [[TMP6]], i32 0
+; MINTREESIZE-NEXT:    [[TMP14:%.*]] = insertelement <2 x float> [[TMP13]], float [[TMP2]], i32 1
+; MINTREESIZE-NEXT:    [[TMP15:%.*]] = insertelement <2 x float> poison, float [[TMP5]], i32 0
+; MINTREESIZE-NEXT:    [[TMP16:%.*]] = insertelement <2 x float> [[TMP15]], float [[TMP1]], i32 1
+; MINTREESIZE-NEXT:    [[TMP17:%.*]] = fadd <4 x float> [[A]], [[B]]
+; MINTREESIZE-NEXT:    ret <4 x float> [[TMP17]]
 ;
   %a0 = extractelement <4 x float> %a, i32 0
   %b0 = extractelement <4 x float> %b, i32 0
   %c0 = fadd float %a0, %b0
   %a1 = extractelement <4 x float> %a, i32 1
   %b1 = extractelement <4 x float> %b, i32 1
   %c1 = fadd float %a1, %b1
   %a2 = extractelement <4 x float> %a, i32 2
;
   %t6 = fmul double %t2, 1.000000e+00
   %i3 = insertelement <4 x double> %i2, double %t6, i32 1
   %t7 = fmul double %t3, 1.000000e+00
   %i4 = insertelement <4 x double> %i3, double %t7, i32 0
   ret <4 x double> %i4
 }
 
 define <8 x float> @_vadd256(<8 x float> %a, <8 x float> %b) local_unnamed_addr #0 {
-; CHECK-LABEL: @_vadd256(
-; CHECK-NEXT:    [[TMP1:%.*]] = fadd <8 x float> [[A:%.*]], [[B:%.*]]
-; CHECK-NEXT:    ret <8 x float> [[TMP1]]
+; THRESHOLD-LABEL: @_vadd256(
+; THRESHOLD-NEXT:    [[TMP1:%.*]] = fadd <8 x float> [[A:%.*]], [[B:%.*]]
+; THRESHOLD-NEXT:    ret <8 x float> [[TMP1]]
+;
+; NOTHRESHOLD-LABEL: @_vadd256(
+; NOTHRESHOLD-NEXT:    [[TMP1:%.*]] = fadd <8 x float> [[A:%.*]], [[B:%.*]]
+; NOTHRESHOLD-NEXT:    ret <8 x float> [[TMP1]]
+;
+; MINTREESIZE-LABEL: @_vadd256(
+; MINTREESIZE-NEXT:    [[TMP1:%.*]] = extractelement <8 x float> [[B:%.*]], i32 7
+; MINTREESIZE-NEXT:    [[TMP2:%.*]] = extractelement <8 x float> [[B]], i32 6
+; MINTREESIZE-NEXT:    [[TMP3:%.*]] = extractelement <8 x float> [[B]], i32 5
+; MINTREESIZE-NEXT:    [[TMP4:%.*]] = extractelement <8 x float> [[B]], i32 4
+; MINTREESIZE-NEXT:    [[TMP5:%.*]] = extractelement <8 x float> [[B]], i32 3
+; MINTREESIZE-NEXT:    [[TMP6:%.*]] = extractelement <8 x float> [[B]], i32 2
+; MINTREESIZE-NEXT:    [[TMP7:%.*]] = extractelement <8 x float> [[B]], i32 1
+; MINTREESIZE-NEXT:    [[TMP8:%.*]] = extractelement <8 x float> [[B]], i32 0
+; MINTREESIZE-NEXT:    [[TMP9:%.*]] = extractelement <8 x float> [[A:%.*]], i32 7
+; MINTREESIZE-NEXT:    [[TMP10:%.*]] = extractelement <8 x float> [[A]], i32 6
+; MINTREESIZE-NEXT:    [[TMP11:%.*]] = extractelement <8 x float> [[A]], i32 5
+; MINTREESIZE-NEXT:    [[TMP12:%.*]] = extractelement <8 x float> [[A]], i32 4
+; MINTREESIZE-NEXT:    [[TMP13:%.*]] = extractelement <8 x float> [[A]], i32 3
+; MINTREESIZE-NEXT:    [[TMP14:%.*]] = extractelement <8 x float> [[A]], i32 2
+; MINTREESIZE-NEXT:    [[TMP15:%.*]] = extractelement <8 x float> [[A]], i32 1
+; MINTREESIZE-NEXT:    [[TMP16:%.*]] = extractelement <8 x float> [[A]], i32 0
+; MINTREESIZE-NEXT:    [[TMP17:%.*]] = insertelement <2 x float> poison, float [[TMP16]], i32 0
+; MINTREESIZE-NEXT:    [[TMP18:%.*]] = insertelement <2 x float> [[TMP17]], float [[TMP8]], i32 1
+; MINTREESIZE-NEXT:    [[TMP19:%.*]] = insertelement <2 x float> poison, float [[TMP15]], i32 0
+; MINTREESIZE-NEXT:    [[TMP20:%.*]] = insertelement <2 x float> [[TMP19]], float [[TMP7]], i32 1
+; MINTREESIZE-NEXT:    [[TMP21:%.*]] = insertelement <2 x float> poison, float [[TMP14]], i32 0
+; MINTREESIZE-NEXT:    [[TMP22:%.*]] = insertelement <2 x float> [[TMP21]], float [[TMP6]], i32 1
+; MINTREESIZE-NEXT:    [[TMP23:%.*]] = insertelement <2 x float> poison, float [[TMP13]], i32 0
+; MINTREESIZE-NEXT:    [[TMP24:%.*]] = insertelement <2 x float> [[TMP23]], float [[TMP5]], i32 1
+; MINTREESIZE-NEXT:    [[TMP25:%.*]] = insertelement <2 x float> poison, float [[TMP12]], i32 0
+; MINTREESIZE-NEXT:    [[TMP26:%.*]] = insertelement <2 x float> [[TMP25]], float [[TMP4]], i32 1
+; MINTREESIZE-NEXT:    [[TMP27:%.*]] = insertelement <2 x float> poison, float [[TMP11]], i32 0
+; MINTREESIZE-NEXT:    [[TMP28:%.*]] = insertelement <2 x float> [[TMP27]], float [[TMP3]], i32 1
+; MINTREESIZE-NEXT:    [[TMP29:%.*]] = insertelement <2 x float> poison, float [[TMP10]], i32 0
+; MINTREESIZE-NEXT:    [[TMP30:%.*]] = insertelement <2 x float> [[TMP29]], float [[TMP2]], i32 1
+; MINTREESIZE-NEXT:    [[TMP31:%.*]] = insertelement <2 x float> poison, float [[TMP9]], i32 0
+; MINTREESIZE-NEXT:    [[TMP32:%.*]] = insertelement <2 x float> [[TMP31]], float [[TMP1]], i32 1
+; MINTREESIZE-NEXT:    [[TMP33:%.*]] = fadd <8 x float> [[A]], [[B]]
+; MINTREESIZE-NEXT:    ret <8 x float> [[TMP33]]
 ;
   %vecext = extractelement <8 x float> %a, i32 0
   %vecext1 = extractelement <8 x float> %b, i32 0
   %add = fadd float %vecext, %vecext1
   %vecext2 = extractelement <8 x float> %a, i32 1
   %vecext3 = extractelement <8 x float> %b, i32 1
   %add4 = fadd float %vecext2, %vecext3
   %vecext5 = extractelement <8 x float> %a, i32 2

llvm/test/Transforms/SLPVectorizer/X86/insert-element-build-vector.ll

 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
-; RUN: opt -S -slp-vectorizer -slp-threshold=-10000 < %s | FileCheck %s
-; RUN: opt -S -slp-vectorizer -slp-threshold=0 < %s | FileCheck %s
+; RUN: opt -S -slp-vectorizer -slp-threshold=-10000 < %s | FileCheck %s --check-prefixes=CHECK,THRESHOLD
+; RUN: opt -S -slp-vectorizer -slp-threshold=0 < %s | FileCheck %s --check-prefixes=CHECK,NOTHRESHOLD
+; RUN: opt -S -slp-vectorizer -slp-threshold=-10000 -slp-min-tree-size=0 < %s | FileCheck %s --check-prefixes=CHECK,MINTREESIZE
 
 target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-n8:16:32:64-S128"
 target triple = "x86_64-apple-macosx10.8.0"
 
 define <4 x float> @simple_select(<4 x float> %a, <4 x float> %b, <4 x i32> %c) #0 {
 ; CHECK-LABEL: @simple_select(
 ; CHECK-NEXT:    [[TMP1:%.*]] = icmp ne <4 x i32> [[C:%.*]], zeroinitializer
 ; CHECK-NEXT:    [[TMP2:%.*]] = select <4 x i1> [[TMP1]], <4 x float> [[A:%.*]], <4 x float> [[B:%.*]]
;
   %rd = insertelement <4 x float> %rc, float %s3, i32 3
   ret <4 x float> %rd
 }
 
 declare void @llvm.assume(i1) nounwind
 
 ; This entire tree is ephemeral, don't vectorize any of it.
 define <4 x float> @simple_select_eph(<4 x float> %a, <4 x float> %b, <4 x i32> %c) #0 {
-; CHECK-LABEL: @simple_select_eph(
-; CHECK-NEXT:    [[C0:%.*]] = extractelement <4 x i32> [[C:%.*]], i32 0
-; CHECK-NEXT:    [[C1:%.*]] = extractelement <4 x i32> [[C]], i32 1
-; CHECK-NEXT:    [[C2:%.*]] = extractelement <4 x i32> [[C]], i32 2
-; CHECK-NEXT:    [[C3:%.*]] = extractelement <4 x i32> [[C]], i32 3
-; CHECK-NEXT:    [[A0:%.*]] = extractelement <4 x float> [[A:%.*]], i32 0
-; CHECK-NEXT:    [[A1:%.*]] = extractelement <4 x float> [[A]], i32 1
-; CHECK-NEXT:    [[A2:%.*]] = extractelement <4 x float> [[A]], i32 2
-; CHECK-NEXT:    [[A3:%.*]] = extractelement <4 x float> [[A]], i32 3
-; CHECK-NEXT:    [[B0:%.*]] = extractelement <4 x float> [[B:%.*]], i32 0
-; CHECK-NEXT:    [[B1:%.*]] = extractelement <4 x float> [[B]], i32 1
-; CHECK-NEXT:    [[B2:%.*]] = extractelement <4 x float> [[B]], i32 2
-; CHECK-NEXT:    [[B3:%.*]] = extractelement <4 x float> [[B]], i32 3
-; CHECK-NEXT:    [[CMP0:%.*]] = icmp ne i32 [[C0]], 0
-; CHECK-NEXT:    [[CMP1:%.*]] = icmp ne i32 [[C1]], 0
-; CHECK-NEXT:    [[CMP2:%.*]] = icmp ne i32 [[C2]], 0
-; CHECK-NEXT:    [[CMP3:%.*]] = icmp ne i32 [[C3]], 0
-; CHECK-NEXT:    [[S0:%.*]] = select i1 [[CMP0]], float [[A0]], float [[B0]]
-; CHECK-NEXT:    [[S1:%.*]] = select i1 [[CMP1]], float [[A1]], float [[B1]]
-; CHECK-NEXT:    [[S2:%.*]] = select i1 [[CMP2]], float [[A2]], float [[B2]]
-; CHECK-NEXT:    [[S3:%.*]] = select i1 [[CMP3]], float [[A3]], float [[B3]]
-; CHECK-NEXT:    [[RA:%.*]] = insertelement <4 x float> undef, float [[S0]], i32 0
-; CHECK-NEXT:    [[RB:%.*]] = insertelement <4 x float> [[RA]], float [[S1]], i32 1
-; CHECK-NEXT:    [[RC:%.*]] = insertelement <4 x float> [[RB]], float [[S2]], i32 2
-; CHECK-NEXT:    [[RD:%.*]] = insertelement <4 x float> [[RC]], float [[S3]], i32 3
-; CHECK-NEXT:    [[Q0:%.*]] = extractelement <4 x float> [[RD]], i32 0
-; CHECK-NEXT:    [[Q1:%.*]] = extractelement <4 x float> [[RD]], i32 1
-; CHECK-NEXT:    [[Q2:%.*]] = extractelement <4 x float> [[RD]], i32 2
-; CHECK-NEXT:    [[Q3:%.*]] = extractelement <4 x float> [[RD]], i32 3
-; CHECK-NEXT:    [[Q4:%.*]] = fadd float [[Q0]], [[Q1]]
-; CHECK-NEXT:    [[Q5:%.*]] = fadd float [[Q2]], [[Q3]]
-; CHECK-NEXT:    [[Q6:%.*]] = fadd float [[Q4]], [[Q5]]
-; CHECK-NEXT:    [[QI:%.*]] = fcmp olt float [[Q6]], [[Q5]]
-; CHECK-NEXT:    call void @llvm.assume(i1 [[QI]])
-; CHECK-NEXT:    ret <4 x float> undef
+; THRESHOLD-LABEL: @simple_select_eph(
+; THRESHOLD-NEXT:    [[C0:%.*]] = extractelement <4 x i32> [[C:%.*]], i32 0
+; THRESHOLD-NEXT:    [[C1:%.*]] = extractelement <4 x i32> [[C]], i32 1
+; THRESHOLD-NEXT:    [[C2:%.*]] = extractelement <4 x i32> [[C]], i32 2
+; THRESHOLD-NEXT:    [[C3:%.*]] = extractelement <4 x i32> [[C]], i32 3
+; THRESHOLD-NEXT:    [[A0:%.*]] = extractelement <4 x float> [[A:%.*]], i32 0
+; THRESHOLD-NEXT:    [[A1:%.*]] = extractelement <4 x float> [[A]], i32 1
+; THRESHOLD-NEXT:    [[A2:%.*]] = extractelement <4 x float> [[A]], i32 2
+; THRESHOLD-NEXT:    [[A3:%.*]] = extractelement <4 x float> [[A]], i32 3
+; THRESHOLD-NEXT:    [[B0:%.*]] = extractelement <4 x float> [[B:%.*]], i32 0
+; THRESHOLD-NEXT:    [[B1:%.*]] = extractelement <4 x float> [[B]], i32 1
+; THRESHOLD-NEXT:    [[B2:%.*]] = extractelement <4 x float> [[B]], i32 2
+; THRESHOLD-NEXT:    [[B3:%.*]] = extractelement <4 x float> [[B]], i32 3
+; THRESHOLD-NEXT:    [[CMP0:%.*]] = icmp ne i32 [[C0]], 0
+; THRESHOLD-NEXT:    [[CMP1:%.*]] = icmp ne i32 [[C1]], 0
+; THRESHOLD-NEXT:    [[CMP2:%.*]] = icmp ne i32 [[C2]], 0
+; THRESHOLD-NEXT:    [[CMP3:%.*]] = icmp ne i32 [[C3]], 0
+; THRESHOLD-NEXT:    [[S0:%.*]] = select i1 [[CMP0]], float [[A0]], float [[B0]]
+; THRESHOLD-NEXT:    [[S1:%.*]] = select i1 [[CMP1]], float [[A1]], float [[B1]]
+; THRESHOLD-NEXT:    [[S2:%.*]] = select i1 [[CMP2]], float [[A2]], float [[B2]]
+; THRESHOLD-NEXT:    [[S3:%.*]] = select i1 [[CMP3]], float [[A3]], float [[B3]]
+; THRESHOLD-NEXT:    [[RA:%.*]] = insertelement <4 x float> undef, float [[S0]], i32 0
+; THRESHOLD-NEXT:    [[RB:%.*]] = insertelement <4 x float> [[RA]], float [[S1]], i32 1
+; THRESHOLD-NEXT:    [[RC:%.*]] = insertelement <4 x float> [[RB]], float [[S2]], i32 2
+; THRESHOLD-NEXT:    [[RD:%.*]] = insertelement <4 x float> [[RC]], float [[S3]], i32 3
+; THRESHOLD-NEXT:    [[Q0:%.*]] = extractelement <4 x float> [[RD]], i32 0
+; THRESHOLD-NEXT:    [[Q1:%.*]] = extractelement <4 x float> [[RD]], i32 1
+; THRESHOLD-NEXT:    [[Q2:%.*]] = extractelement <4 x float> [[RD]], i32 2
+; THRESHOLD-NEXT:    [[Q3:%.*]] = extractelement <4 x float> [[RD]], i32 3
+; THRESHOLD-NEXT:    [[Q4:%.*]] = fadd float [[Q0]], [[Q1]]
+; THRESHOLD-NEXT:    [[Q5:%.*]] = fadd float [[Q2]], [[Q3]]
+; THRESHOLD-NEXT:    [[Q6:%.*]] = fadd float [[Q4]], [[Q5]]
+; THRESHOLD-NEXT:    [[QI:%.*]] = fcmp olt float [[Q6]], [[Q5]]
+; THRESHOLD-NEXT:    call void @llvm.assume(i1 [[QI]])
+; THRESHOLD-NEXT:    ret <4 x float> undef
+;
+; NOTHRESHOLD-LABEL: @simple_select_eph(
+; NOTHRESHOLD-NEXT:    [[C0:%.*]] = extractelement <4 x i32> [[C:%.*]], i32 0
+; NOTHRESHOLD-NEXT:    [[C1:%.*]] = extractelement <4 x i32> [[C]], i32 1
+; NOTHRESHOLD-NEXT:    [[C2:%.*]] = extractelement <4 x i32> [[C]], i32 2
+; NOTHRESHOLD-NEXT:    [[C3:%.*]] = extractelement <4 x i32> [[C]], i32 3
+; NOTHRESHOLD-NEXT:    [[A0:%.*]] = extractelement <4 x float> [[A:%.*]], i32 0
+; NOTHRESHOLD-NEXT:    [[A1:%.*]] = extractelement <4 x float> [[A]], i32 1
+; NOTHRESHOLD-NEXT:    [[A2:%.*]] = extractelement <4 x float> [[A]], i32 2
+; NOTHRESHOLD-NEXT:    [[A3:%.*]] = extractelement <4 x float> [[A]], i32 3
+; NOTHRESHOLD-NEXT:    [[B0:%.*]] = extractelement <4 x float> [[B:%.*]], i32 0
+; NOTHRESHOLD-NEXT:    [[B1:%.*]] = extractelement <4 x float> [[B]], i32 1
+; NOTHRESHOLD-NEXT:    [[B2:%.*]] = extractelement <4 x float> [[B]], i32 2
+; NOTHRESHOLD-NEXT:    [[B3:%.*]] = extractelement <4 x float> [[B]], i32 3
+; NOTHRESHOLD-NEXT:    [[CMP0:%.*]] = icmp ne i32 [[C0]], 0
+; NOTHRESHOLD-NEXT:    [[CMP1:%.*]] = icmp ne i32 [[C1]], 0
+; NOTHRESHOLD-NEXT:    [[CMP2:%.*]] = icmp ne i32 [[C2]], 0
+; NOTHRESHOLD-NEXT:    [[CMP3:%.*]] = icmp ne i32 [[C3]], 0
+; NOTHRESHOLD-NEXT:    [[S0:%.*]] = select i1 [[CMP0]], float [[A0]], float [[B0]]
+; NOTHRESHOLD-NEXT:    [[S1:%.*]] = select i1 [[CMP1]], float [[A1]], float [[B1]]
+; NOTHRESHOLD-NEXT:    [[S2:%.*]] = select i1 [[CMP2]], float [[A2]], float [[B2]]
+; NOTHRESHOLD-NEXT:    [[S3:%.*]] = select i1 [[CMP3]], float [[A3]], float [[B3]]
+; NOTHRESHOLD-NEXT:    [[RA:%.*]] = insertelement <4 x float> undef, float [[S0]], i32 0
+; NOTHRESHOLD-NEXT:    [[RB:%.*]] = insertelement <4 x float> [[RA]], float [[S1]], i32 1
+; NOTHRESHOLD-NEXT:    [[RC:%.*]] = insertelement <4 x float> [[RB]], float [[S2]], i32 2
+; NOTHRESHOLD-NEXT:    [[RD:%.*]] = insertelement <4 x float> [[RC]], float [[S3]], i32 3
+; NOTHRESHOLD-NEXT:    [[Q0:%.*]] = extractelement <4 x float> [[RD]], i32 0
+; NOTHRESHOLD-NEXT:    [[Q1:%.*]] = extractelement <4 x float> [[RD]], i32 1
+; NOTHRESHOLD-NEXT:    [[Q2:%.*]] = extractelement <4 x float> [[RD]], i32 2
+; NOTHRESHOLD-NEXT:    [[Q3:%.*]] = extractelement <4 x float> [[RD]], i32 3
+; NOTHRESHOLD-NEXT:    [[Q4:%.*]] = fadd float [[Q0]], [[Q1]]
+; NOTHRESHOLD-NEXT:    [[Q5:%.*]] = fadd float [[Q2]], [[Q3]]
+; NOTHRESHOLD-NEXT:    [[Q6:%.*]] = fadd float [[Q4]], [[Q5]]
+; NOTHRESHOLD-NEXT:    [[QI:%.*]] = fcmp olt float [[Q6]], [[Q5]]
+; NOTHRESHOLD-NEXT:    call void @llvm.assume(i1 [[QI]])
+; NOTHRESHOLD-NEXT:    ret <4 x float> undef
+;
+; MINTREESIZE-LABEL: @simple_select_eph(
+; MINTREESIZE-NEXT:    [[C0:%.*]] = extractelement <4 x i32> [[C:%.*]], i32 0
+; MINTREESIZE-NEXT:    [[C1:%.*]] = extractelement <4 x i32> [[C]], i32 1
+; MINTREESIZE-NEXT:    [[C2:%.*]] = extractelement <4 x i32> [[C]], i32 2
+; MINTREESIZE-NEXT:    [[C3:%.*]] = extractelement <4 x i32> [[C]], i32 3
+; MINTREESIZE-NEXT:    [[A0:%.*]] = extractelement <4 x float> [[A:%.*]], i32 0
+; MINTREESIZE-NEXT:    [[A1:%.*]] = extractelement <4 x float> [[A]], i32 1
+; MINTREESIZE-NEXT:    [[A2:%.*]] = extractelement <4 x float> [[A]], i32 2
+; MINTREESIZE-NEXT:    [[A3:%.*]] = extractelement <4 x float> [[A]], i32 3
+; MINTREESIZE-NEXT:    [[B0:%.*]] = extractelement <4 x float> [[B:%.*]], i32 0
+; MINTREESIZE-NEXT:    [[B1:%.*]] = extractelement <4 x float> [[B]], i32 1
+; MINTREESIZE-NEXT:    [[B2:%.*]] = extractelement <4 x float> [[B]], i32 2
+; MINTREESIZE-NEXT:    [[B3:%.*]] = extractelement <4 x float> [[B]], i32 3
+; MINTREESIZE-NEXT:    [[CMP0:%.*]] = icmp ne i32 [[C0]], 0
+; MINTREESIZE-NEXT:    [[CMP1:%.*]] = icmp ne i32 [[C1]], 0
+; MINTREESIZE-NEXT:    [[CMP2:%.*]] = icmp ne i32 [[C2]], 0
+; MINTREESIZE-NEXT:    [[CMP3:%.*]] = icmp ne i32 [[C3]], 0
+; MINTREESIZE-NEXT:    [[S0:%.*]] = select i1 [[CMP0]], float [[A0]], float [[B0]]
+; MINTREESIZE-NEXT:    [[S1:%.*]] = select i1 [[CMP1]], float [[A1]], float [[B1]]
+; MINTREESIZE-NEXT:    [[S2:%.*]] = select i1 [[CMP2]], float [[A2]], float [[B2]]
+; MINTREESIZE-NEXT:    [[S3:%.*]] = select i1 [[CMP3]], float [[A3]], float [[B3]]
+; MINTREESIZE-NEXT:    [[RA:%.*]] = insertelement <4 x float> undef, float [[S0]], i32 0
+; MINTREESIZE-NEXT:    [[RB:%.*]] = insertelement <4 x float> [[RA]], float [[S1]], i32 1
+; MINTREESIZE-NEXT:    [[RC:%.*]] = insertelement <4 x float> [[RB]], float [[S2]], i32 2
+; MINTREESIZE-NEXT:    [[RD:%.*]] = insertelement <4 x float> [[RC]], float [[S3]], i32 3
+; MINTREESIZE-NEXT:    [[Q0:%.*]] = extractelement <4 x float> [[RD]], i32 0
+; MINTREESIZE-NEXT:    [[Q1:%.*]] = extractelement <4 x float> [[RD]], i32 1
+; MINTREESIZE-NEXT:    [[Q2:%.*]] = extractelement <4 x float> [[RD]], i32 2
+; MINTREESIZE-NEXT:    [[Q3:%.*]] = extractelement <4 x float> [[RD]], i32 3
+; MINTREESIZE-NEXT:    [[TMP1:%.*]] = insertelement <2 x float> poison, float [[Q2]], i32 0
+; MINTREESIZE-NEXT:    [[TMP2:%.*]] = insertelement <2 x float> [[TMP1]], float [[Q3]], i32 1
+; MINTREESIZE-NEXT:    [[Q4:%.*]] = fadd float [[Q0]], [[Q1]]
+; MINTREESIZE-NEXT:    [[Q5:%.*]] = fadd float [[Q2]], [[Q3]]
+; MINTREESIZE-NEXT:    [[TMP3:%.*]] = insertelement <2 x float> poison, float [[Q4]], i32 0
+; MINTREESIZE-NEXT:    [[TMP4:%.*]] = insertelement <2 x float> [[TMP3]], float [[Q5]], i32 1
+; MINTREESIZE-NEXT:    [[Q6:%.*]] = fadd float [[Q4]], [[Q5]]
+; MINTREESIZE-NEXT:    [[TMP5:%.*]] = insertelement <2 x float> poison, float [[Q6]], i32 0
+; MINTREESIZE-NEXT:    [[TMP6:%.*]] = insertelement <2 x float> [[TMP5]], float [[Q5]], i32 1
+; MINTREESIZE-NEXT:    [[QI:%.*]] = fcmp olt float [[Q6]], [[Q5]]
+; MINTREESIZE-NEXT:    call void @llvm.assume(i1 [[QI]])
+; MINTREESIZE-NEXT:    ret <4 x float> undef
 ;
   %c0 = extractelement <4 x i32> %c, i32 0
   %c1 = extractelement <4 x i32> %c, i32 1
   %c2 = extractelement <4 x i32> %c, i32 2
   %c3 = extractelement <4 x i32> %c, i32 3
   %a0 = extractelement <4 x float> %a, i32 0
   %a1 = extractelement <4 x float> %a, i32 1
   %a2 = extractelement <4 x float> %a, i32 2
;
   %10 = extractelement <2 x float> %8, i32 1
   %rb = insertelement <4 x float> %ra, float %10, i32 1
   ret <4 x float> %rb
 }
 
 ; Make sure that vectorization happens even if insertelements operations
 ; must be rescheduled. The case here is from compiling Julia.
 define <4 x float> @reschedule_extract(<4 x float> %a, <4 x float> %b) {
-; CHECK-LABEL: @reschedule_extract(
-; CHECK-NEXT:    [[TMP1:%.*]] = fadd <4 x float> [[A:%.*]], [[B:%.*]]
-; CHECK-NEXT:    ret <4 x float> [[TMP1]]
+; THRESHOLD-LABEL: @reschedule_extract(
+; THRESHOLD-NEXT:    [[TMP1:%.*]] = fadd <4 x float> [[A:%.*]], [[B:%.*]]
+; THRESHOLD-NEXT:    ret <4 x float> [[TMP1]]
+;
+; NOTHRESHOLD-LABEL: @reschedule_extract(
+; NOTHRESHOLD-NEXT:    [[TMP1:%.*]] = fadd <4 x float> [[A:%.*]], [[B:%.*]]
+; NOTHRESHOLD-NEXT:    ret <4 x float> [[TMP1]]
+;
+; MINTREESIZE-LABEL: @reschedule_extract(
+; MINTREESIZE-NEXT:    [[TMP1:%.*]] = extractelement <4 x float> [[B:%.*]], i32 3
+; MINTREESIZE-NEXT:    [[TMP2:%.*]] = extractelement <4 x float> [[B]], i32 2
+; MINTREESIZE-NEXT:    [[TMP3:%.*]] = extractelement <4 x float> [[B]], i32 1
+; MINTREESIZE-NEXT:    [[TMP4:%.*]] = extractelement <4 x float> [[B]], i32 0
+; MINTREESIZE-NEXT:    [[TMP5:%.*]] = extractelement <4 x float> [[A:%.*]], i32 3
+; MINTREESIZE-NEXT:    [[TMP6:%.*]] = extractelement <4 x float> [[A]], i32 2
+; MINTREESIZE-NEXT:    [[TMP7:%.*]] = extractelement <4 x float> [[A]], i32 1
+; MINTREESIZE-NEXT:    [[TMP8:%.*]] = extractelement <4 x float> [[A]], i32 0
+; MINTREESIZE-NEXT:    [[TMP9:%.*]] = insertelement <2 x float> poison, float [[TMP8]], i32 0
+; MINTREESIZE-NEXT:    [[TMP10:%.*]] = insertelement <2 x float> [[TMP9]], float [[TMP4]], i32 1
+; MINTREESIZE-NEXT:    [[TMP11:%.*]] = insertelement <2 x float> poison, float [[TMP7]], i32 0
+; MINTREESIZE-NEXT:    [[TMP12:%.*]] = insertelement <2 x float> [[TMP11]], float [[TMP3]], i32 1
+; MINTREESIZE-NEXT:    [[TMP13:%.*]] = insertelement <2 x float> poison, float [[TMP6]], i32 0
+; MINTREESIZE-NEXT:    [[TMP14:%.*]] = insertelement <2 x float> [[TMP13]], float [[TMP2]], i32 1
+; MINTREESIZE-NEXT:    [[TMP15:%.*]] = insertelement <2 x float> poison, float [[TMP5]], i32 0
+; MINTREESIZE-NEXT:    [[TMP16:%.*]] = insertelement <2 x float> [[TMP15]], float [[TMP1]], i32 1
+; MINTREESIZE-NEXT:    [[TMP17:%.*]] = fadd <4 x float> [[A]], [[B]]
+; MINTREESIZE-NEXT:    ret <4 x float> [[TMP17]]
 ;
   %a0 = extractelement <4 x float> %a, i32 0
   %b0 = extractelement <4 x float> %b, i32 0
   %c0 = fadd float %a0, %b0
   %v0 = insertelement <4 x float> undef, float %c0, i32 0
   %a1 = extractelement <4 x float> %a, i32 1
   %b1 = extractelement <4 x float> %b, i32 1
   %c1 = fadd float %a1, %b1
   %v1 = insertelement <4 x float> %v0, float %c1, i32 1
   %a2 = extractelement <4 x float> %a, i32 2
   %b2 = extractelement <4 x float> %b, i32 2
   %c2 = fadd float %a2, %b2
   %v2 = insertelement <4 x float> %v1, float %c2, i32 2
   %a3 = extractelement <4 x float> %a, i32 3
   %b3 = extractelement <4 x float> %b, i32 3
   %c3 = fadd float %a3, %b3
   %v3 = insertelement <4 x float> %v2, float %c3, i32 3
   ret <4 x float> %v3
 }
 
 ; Check that cost model for vectorization takes credit for
 ; instructions that are erased.
 define <4 x float> @take_credit(<4 x float> %a, <4 x float> %b) {
-; CHECK-LABEL: @take_credit(
-; CHECK-NEXT:    [[TMP1:%.*]] = fadd <4 x float> [[A:%.*]], [[B:%.*]]
-; CHECK-NEXT:    ret <4 x float> [[TMP1]]
+; THRESHOLD-LABEL: @take_credit(
+; THRESHOLD-NEXT:    [[TMP1:%.*]] = fadd <4 x float> [[A:%.*]], [[B:%.*]]
+; THRESHOLD-NEXT:    ret <4 x float> [[TMP1]]
+;
+; NOTHRESHOLD-LABEL: @take_credit(
+; NOTHRESHOLD-NEXT:    [[TMP1:%.*]] = fadd <4 x float> [[A:%.*]], [[B:%.*]]
+; NOTHRESHOLD-NEXT:    ret <4 x float> [[TMP1]]
+;
+; MINTREESIZE-LABEL: @take_credit(
+; MINTREESIZE-NEXT:    [[TMP1:%.*]] = extractelement <4 x float> [[B:%.*]], i32 3
+; MINTREESIZE-NEXT:    [[TMP2:%.*]] = extractelement <4 x float> [[B]], i32 2
+; MINTREESIZE-NEXT:    [[TMP3:%.*]] = extractelement <4 x float> [[B]], i32 1
+; MINTREESIZE-NEXT:    [[TMP4:%.*]] = extractelement <4 x float> [[B]], i32 0
+; MINTREESIZE-NEXT:    [[TMP5:%.*]] = extractelement <4 x float> [[A:%.*]], i32 3
+; MINTREESIZE-NEXT:    [[TMP6:%.*]] = extractelement <4 x float> [[A]], i32 2
+; MINTREESIZE-NEXT:    [[TMP7:%.*]] = extractelement <4 x float> [[A]], i32 1
+; MINTREESIZE-NEXT:    [[TMP8:%.*]] = extractelement <4 x float> [[A]], i32 0
+; MINTREESIZE-NEXT:    [[TMP9:%.*]] = insertelement <2 x float> poison, float [[TMP8]], i32 0
+; MINTREESIZE-NEXT:    [[TMP10:%.*]] = insertelement <2 x float> [[TMP9]], float [[TMP4]], i32 1
+; MINTREESIZE-NEXT:    [[TMP11:%.*]] = insertelement <2 x float> poison, float [[TMP7]], i32 0
+; MINTREESIZE-NEXT:    [[TMP12:%.*]] = insertelement <2 x float> [[TMP11]], float [[TMP3]], i32 1
+; MINTREESIZE-NEXT:    [[TMP13:%.*]] = insertelement <2 x float> poison, float [[TMP6]], i32 0
+; MINTREESIZE-NEXT:    [[TMP14:%.*]] = insertelement <2 x float> [[TMP13]], float [[TMP2]], i32 1
+; MINTREESIZE-NEXT:    [[TMP15:%.*]] = insertelement <2 x float> poison, float [[TMP5]], i32 0
+; MINTREESIZE-NEXT:    [[TMP16:%.*]] = insertelement <2 x float> [[TMP15]], float [[TMP1]], i32 1
+; MINTREESIZE-NEXT:    [[TMP17:%.*]] = fadd <4 x float> [[A]], [[B]]
+; MINTREESIZE-NEXT:    ret <4 x float> [[TMP17]]
 ;
   %a0 = extractelement <4 x float> %a, i32 0
   %b0 = extractelement <4 x float> %b, i32 0
   %c0 = fadd float %a0, %b0
   %a1 = extractelement <4 x float> %a, i32 1
   %b1 = extractelement <4 x float> %b, i32 1
   %c1 = fadd float %a1, %b1
   %a2 = extractelement <4 x float> %a, i32 2
;
   %t6 = fmul double %t2, 1.000000e+00
   %i3 = insertelement <4 x double> %i2, double %t6, i32 1
   %t7 = fmul double %t3, 1.000000e+00
   %i4 = insertelement <4 x double> %i3, double %t7, i32 0
   ret <4 x double> %i4
 }
 
 define <8 x float> @_vadd256(<8 x float> %a, <8 x float> %b) local_unnamed_addr #0 {
-; CHECK-LABEL: @_vadd256(
-; CHECK-NEXT:    [[TMP1:%.*]] = fadd <8 x float> [[A:%.*]], [[B:%.*]]
-; CHECK-NEXT:    ret <8 x float> [[TMP1]]
+; THRESHOLD-LABEL: @_vadd256(
+; THRESHOLD-NEXT:    [[TMP1:%.*]] = fadd <8 x float> [[A:%.*]], [[B:%.*]]
+; THRESHOLD-NEXT:    ret <8 x float> [[TMP1]]
+;
+; NOTHRESHOLD-LABEL: @_vadd256(
+; NOTHRESHOLD-NEXT:    [[TMP1:%.*]] = fadd <8 x float> [[A:%.*]], [[B:%.*]]
+; NOTHRESHOLD-NEXT:    ret <8 x float> [[TMP1]]
+;
+; MINTREESIZE-LABEL: @_vadd256(
+; MINTREESIZE-NEXT:    [[TMP1:%.*]] = extractelement <8 x float> [[B:%.*]], i32 7
+; MINTREESIZE-NEXT:    [[TMP2:%.*]] = extractelement <8 x float> [[B]], i32 6
+; MINTREESIZE-NEXT:    [[TMP3:%.*]] = extractelement <8 x float> [[B]], i32 5
+; MINTREESIZE-NEXT:    [[TMP4:%.*]] = extractelement <8 x float> [[B]], i32 4
+; MINTREESIZE-NEXT:    [[TMP5:%.*]] = extractelement <8 x float> [[B]], i32 3
+; MINTREESIZE-NEXT:    [[TMP6:%.*]] = extractelement <8 x float> [[B]], i32 2
+; MINTREESIZE-NEXT:    [[TMP7:%.*]] = extractelement <8 x float> [[B]], i32 1
+; MINTREESIZE-NEXT:    [[TMP8:%.*]] = extractelement <8 x float> [[B]], i32 0
+; MINTREESIZE-NEXT:    [[TMP9:%.*]] = extractelement <8 x float> [[A:%.*]], i32 7
+; MINTREESIZE-NEXT:    [[TMP10:%.*]] = extractelement <8 x float> [[A]], i32 6
+; MINTREESIZE-NEXT:    [[TMP11:%.*]] = extractelement <8 x float> [[A]], i32 5
+; MINTREESIZE-NEXT:    [[TMP12:%.*]] = extractelement <8 x float> [[A]], i32 4
+; MINTREESIZE-NEXT:    [[TMP13:%.*]] = extractelement <8 x float> [[A]], i32 3
+; MINTREESIZE-NEXT:    [[TMP14:%.*]] = extractelement <8 x float> [[A]], i32 2
+; MINTREESIZE-NEXT:    [[TMP15:%.*]] = extractelement <8 x float> [[A]], i32 1
+; MINTREESIZE-NEXT:    [[TMP16:%.*]] = extractelement <8 x float> [[A]], i32 0
+; MINTREESIZE-NEXT:    [[TMP17:%.*]] = insertelement <2 x float> poison, float [[TMP16]], i32 0
+; MINTREESIZE-NEXT:    [[TMP18:%.*]] = insertelement <2 x float> [[TMP17]], float [[TMP8]], i32 1
+; MINTREESIZE-NEXT:    [[TMP19:%.*]] = insertelement <2 x float> poison, float [[TMP15]], i32 0
+; MINTREESIZE-NEXT:    [[TMP20:%.*]] = insertelement <2 x float> [[TMP19]], float [[TMP7]], i32 1
+; MINTREESIZE-NEXT:    [[TMP21:%.*]] = insertelement <2 x float> poison, float [[TMP14]], i32 0
+; MINTREESIZE-NEXT:    [[TMP22:%.*]] = insertelement <2 x float> [[TMP21]], float [[TMP6]], i32 1
+; MINTREESIZE-NEXT:    [[TMP23:%.*]] = insertelement <2 x float> poison, float [[TMP13]], i32 0
+; MINTREESIZE-NEXT:    [[TMP24:%.*]] = insertelement <2 x float> [[TMP23]], float [[TMP5]], i32 1
+; MINTREESIZE-NEXT:    [[TMP25:%.*]] = insertelement <2 x float> poison, float [[TMP12]], i32 0
+; MINTREESIZE-NEXT:    [[TMP26:%.*]] = insertelement <2 x float> [[TMP25]], float [[TMP4]], i32 1
+; MINTREESIZE-NEXT:    [[TMP27:%.*]] = insertelement <2 x float> poison, float [[TMP11]], i32 0
+; MINTREESIZE-NEXT:    [[TMP28:%.*]] = insertelement <2 x float> [[TMP27]], float [[TMP3]], i32 1
+; MINTREESIZE-NEXT:    [[TMP29:%.*]] = insertelement <2 x float> poison, float [[TMP10]], i32 0
+; MINTREESIZE-NEXT:    [[TMP30:%.*]] = insertelement <2 x float> [[TMP29]], float [[TMP2]], i32 1
+; MINTREESIZE-NEXT:    [[TMP31:%.*]] = insertelement <2 x float> poison, float [[TMP9]], i32 0
+; MINTREESIZE-NEXT:    [[TMP32:%.*]] = insertelement <2 x float> [[TMP31]], float [[TMP1]], i32 1
+; MINTREESIZE-NEXT:    [[TMP33:%.*]] = fadd <8 x float> [[A]], [[B]]
+; MINTREESIZE-NEXT:    ret <8 x float> [[TMP33]]
 ;
   %vecext = extractelement <8 x float> %a, i32 0
   %vecext1 = extractelement <8 x float> %b, i32 0
   %add = fadd float %vecext, %vecext1
   %vecext2 = extractelement <8 x float> %a, i32 1
   %vecext3 = extractelement <8 x float> %b, i32 1
   %add4 = fadd float %vecext2, %vecext3
   %vecext5 = extractelement <8 x float> %a, i32 2