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[SLP] Revert r296863 due to miscompiles. 

Details and reproducer are on the email thread for r296863.

llvm-svn: 297103
This commit is contained in:
Michael Kuperstein 2017-03-06 23:54:51 +00:00
parent 4af068ea55
commit 768d013a03
5 changed files with 83 additions and 152 deletions
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7
llvm/include/llvm/Analysis/LoopAccessAnalysis.h
View File

@ -660,15 +660,12 @@ int64_t getPtrStride(PredicatedScalarEvolution &PSE, Value *Ptr, const Loop *Lp,
/// \brief Try to sort an array of loads / stores.
///
/// An array of loads / stores can only be sorted if all pointer operands
/// refer to the same object, and the differences between these pointers
/// refer to the same object, and the differences between these pointers
/// are known to be constant. If that is the case, this returns true, and the
/// sorted array is returned in \p Sorted. Otherwise, this returns false, and
/// \p Sorted is invalid.
// If \p Mask is not null, it also returns the \p Mask which is the shuffle
// mask for actual memory access order.
bool sortMemAccesses(ArrayRef<Value *> VL, const DataLayout &DL,
ScalarEvolution &SE, SmallVectorImpl<Value *> &Sorted,
SmallVectorImpl<unsigned> *Mask = nullptr);
ScalarEvolution &SE, SmallVectorImpl<Value *> &Sorted);
/// \brief Returns true if the memory operations \p A and \p B are consecutive.
/// This is a simple API that does not depend on the analysis pass.

32
llvm/lib/Analysis/LoopAccessAnalysis.cpp
View File

@ -1040,8 +1040,7 @@ static unsigned getAddressSpaceOperand(Value *I) {
bool llvm::sortMemAccesses(ArrayRef<Value *> VL, const DataLayout &DL,
ScalarEvolution &SE,
SmallVectorImpl<Value *> &Sorted,
SmallVectorImpl<unsigned> *Mask) {
SmallVectorImpl<Value *> &Sorted) {
SmallVector<std::pair<int64_t, Value *>, 4> OffValPairs;
OffValPairs.reserve(VL.size());
Sorted.reserve(VL.size());
@ -1051,6 +1050,7 @@ bool llvm::sortMemAccesses(ArrayRef<Value *> VL, const DataLayout &DL,
Value *Ptr0 = getPointerOperand(VL[0]);
const SCEV *Scev0 = SE.getSCEV(Ptr0);
Value *Obj0 = GetUnderlyingObject(Ptr0, DL);
for (auto *Val : VL) {
// The only kind of access we care about here is load.
if (!isa<LoadInst>(Val))
@ -1077,30 +1077,14 @@ bool llvm::sortMemAccesses(ArrayRef<Value *> VL, const DataLayout &DL,
OffValPairs.emplace_back(Diff->getAPInt().getSExtValue(), Val);
}
SmallVector<unsigned, 4> UseOrder(VL.size());
for (unsigned i = 0; i < VL.size(); i++) {
UseOrder[i] = i;
}
// Sort the memory accesses and keep the order of their uses in UseOrder.
std::sort(UseOrder.begin(), UseOrder.end(),
[&OffValPairs](unsigned Left, unsigned Right) {
return OffValPairs[Left].first < OffValPairs[Right].first;
std::sort(OffValPairs.begin(), OffValPairs.end(),
[](const std::pair<int64_t, Value *> &Left,
const std::pair<int64_t, Value *> &Right) {
return Left.first < Right.first;
});
for (unsigned i = 0; i < VL.size(); i++)
Sorted.emplace_back(OffValPairs[UseOrder[i]].second);
// Sort UseOrder to compute the Mask.
if (Mask) {
Mask->reserve(VL.size());
for (unsigned i = 0; i < VL.size(); i++)
Mask->emplace_back(i);
std::sort(Mask->begin(), Mask->end(),
[&UseOrder](unsigned Left, unsigned Right) {
return UseOrder[Left] < UseOrder[Right];
});
}
for (auto &it : OffValPairs)
Sorted.push_back(it.second);
return true;
}

151
llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
View File

@ -423,8 +423,10 @@ private:
/// be vectorized to use the original vector (or aggregate "bitcast" to a vector).
bool canReuseExtract(ArrayRef<Value *> VL, unsigned Opcode) const;
/// Vectorize a single entry in the tree.
Value *vectorizeTree(TreeEntry *E);
/// Vectorize a single entry in the tree. VL icontains all isomorphic scalars
/// in order of its usage in a user program, for example ADD1, ADD2 and so on
/// or LOAD1 , LOAD2 etc.
Value *vectorizeTree(ArrayRef<Value *> VL, TreeEntry *E);
/// Vectorize a single entry in the tree, starting in \p VL.
Value *vectorizeTree(ArrayRef<Value *> VL);
@ -464,8 +466,8 @@ private:
SmallVectorImpl<Value *> &Left,
SmallVectorImpl<Value *> &Right);
struct TreeEntry {
TreeEntry()
: Scalars(), VectorizedValue(nullptr), NeedToGather(0), ShuffleMask() {}
TreeEntry() : Scalars(), VectorizedValue(nullptr),
NeedToGather(0), NeedToShuffle(0) {}
/// \returns true if the scalars in VL are equal to this entry.
bool isSame(ArrayRef<Value *> VL) const {
@ -493,23 +495,19 @@ private:
/// Do we need to gather this sequence ?
bool NeedToGather;
/// Records optional suffle mask for jumbled memory accesses in this.
SmallVector<unsigned, 8> ShuffleMask;
/// Do we need to shuffle the load ?
bool NeedToShuffle;
};
/// Create a new VectorizableTree entry.
TreeEntry *newTreeEntry(ArrayRef<Value *> VL, bool Vectorized,
ArrayRef<unsigned> ShuffleMask = None) {
bool NeedToShuffle) {
VectorizableTree.emplace_back();
int idx = VectorizableTree.size() - 1;
TreeEntry *Last = &VectorizableTree[idx];
Last->Scalars.insert(Last->Scalars.begin(), VL.begin(), VL.end());
Last->NeedToGather = !Vectorized;
if (!ShuffleMask.empty())
Last->ShuffleMask.insert(Last->ShuffleMask.begin(), ShuffleMask.begin(),
ShuffleMask.end());
Last->NeedToShuffle = NeedToShuffle;
if (Vectorized) {
for (int i = 0, e = VL.size(); i != e; ++i) {
assert(!ScalarToTreeEntry.count(VL[i]) && "Scalar already in tree!");
@ -1032,21 +1030,21 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
if (Depth == RecursionMaxDepth) {
DEBUG(dbgs() << "SLP: Gathering due to max recursion depth.\n");
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
return;
}
// Don't handle vectors.
if (VL[0]->getType()->isVectorTy()) {
DEBUG(dbgs() << "SLP: Gathering due to vector type.\n");
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
return;
}
if (StoreInst *SI = dyn_cast<StoreInst>(VL[0]))
if (SI->getValueOperand()->getType()->isVectorTy()) {
DEBUG(dbgs() << "SLP: Gathering due to store vector type.\n");
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
return;
}
unsigned Opcode = getSameOpcode(VL);
@ -1063,7 +1061,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
// If all of the operands are identical or constant we have a simple solution.
if (allConstant(VL) || isSplat(VL) || !allSameBlock(VL) || !Opcode) {
DEBUG(dbgs() << "SLP: Gathering due to C,S,B,O. \n");
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
return;
}
@ -1075,7 +1073,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
if (EphValues.count(VL[i])) {
DEBUG(dbgs() << "SLP: The instruction (" << *VL[i] <<
") is ephemeral.\n");
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
return;
}
}
@ -1088,7 +1086,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
DEBUG(dbgs() << "SLP: \tChecking bundle: " << *VL[i] << ".\n");
if (E->Scalars[i] != VL[i]) {
DEBUG(dbgs() << "SLP: Gathering due to partial overlap.\n");
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
return;
}
}
@ -1101,7 +1099,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
if (ScalarToTreeEntry.count(VL[i])) {
DEBUG(dbgs() << "SLP: The instruction (" << *VL[i] <<
") is already in tree.\n");
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
return;
}
}
@ -1111,7 +1109,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
for (unsigned i = 0, e = VL.size(); i != e; ++i) {
if (MustGather.count(VL[i])) {
DEBUG(dbgs() << "SLP: Gathering due to gathered scalar.\n");
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
return;
}
}
@ -1125,7 +1123,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
// Don't go into unreachable blocks. They may contain instructions with
// dependency cycles which confuse the final scheduling.
DEBUG(dbgs() << "SLP: bundle in unreachable block.\n");
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
return;
}
@ -1134,7 +1132,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
for (unsigned j = i+1; j < e; ++j)
if (VL[i] == VL[j]) {
DEBUG(dbgs() << "SLP: Scalar used twice in bundle.\n");
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
return;
}
@ -1149,7 +1147,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
assert((!BS.getScheduleData(VL[0]) ||
!BS.getScheduleData(VL[0])->isPartOfBundle()) &&
"tryScheduleBundle should cancelScheduling on failure");
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
return;
}
DEBUG(dbgs() << "SLP: We are able to schedule this bundle.\n");
@ -1166,12 +1164,12 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
if (Term) {
DEBUG(dbgs() << "SLP: Need to swizzle PHINodes (TerminatorInst use).\n");
BS.cancelScheduling(VL);
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
return;
}
}
newTreeEntry(VL, true);
newTreeEntry(VL, true, false);
DEBUG(dbgs() << "SLP: added a vector of PHINodes.\n");
for (unsigned i = 0, e = PH->getNumIncomingValues(); i < e; ++i) {
@ -1193,7 +1191,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
} else {
BS.cancelScheduling(VL);
}
newTreeEntry(VL, Reuse);
newTreeEntry(VL, Reuse, false);
return;
}
case Instruction::Load: {
@ -1209,7 +1207,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
if (DL->getTypeSizeInBits(ScalarTy) !=
DL->getTypeAllocSizeInBits(ScalarTy)) {
BS.cancelScheduling(VL);
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
DEBUG(dbgs() << "SLP: Gathering loads of non-packed type.\n");
return;
}
@ -1220,7 +1218,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
LoadInst *L = cast<LoadInst>(VL[i]);
if (!L->isSimple()) {
BS.cancelScheduling(VL);
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
DEBUG(dbgs() << "SLP: Gathering non-simple loads.\n");
return;
}
@ -1240,7 +1238,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
if (Consecutive) {
++NumLoadsWantToKeepOrder;
newTreeEntry(VL, true);
newTreeEntry(VL, true, false);
DEBUG(dbgs() << "SLP: added a vector of loads.\n");
return;
}
@ -1257,8 +1255,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
if (VL.size() > 2 && !ReverseConsecutive) {
bool ShuffledLoads = true;
SmallVector<Value *, 8> Sorted;
SmallVector<unsigned, 4> Mask;
if (sortMemAccesses(VL, *DL, *SE, Sorted, &Mask)) {
if (sortMemAccesses(VL, *DL, *SE, Sorted)) {
auto NewVL = makeArrayRef(Sorted.begin(), Sorted.end());
for (unsigned i = 0, e = NewVL.size() - 1; i < e; ++i) {
if (!isConsecutiveAccess(NewVL[i], NewVL[i + 1], *DL, *SE)) {
@ -1267,14 +1264,14 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
}
}
if (ShuffledLoads) {
newTreeEntry(NewVL, true, makeArrayRef(Mask.begin(), Mask.end()));
newTreeEntry(NewVL, true, true);
return;
}
}
}
BS.cancelScheduling(VL);
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
if (ReverseConsecutive) {
++NumLoadsWantToChangeOrder;
@ -1301,12 +1298,12 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
Type *Ty = cast<Instruction>(Val)->getOperand(0)->getType();
if (Ty != SrcTy || !isValidElementType(Ty)) {
BS.cancelScheduling(VL);
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
DEBUG(dbgs() << "SLP: Gathering casts with different src types.\n");
return;
}
}
newTreeEntry(VL, true);
newTreeEntry(VL, true, false);
DEBUG(dbgs() << "SLP: added a vector of casts.\n");
for (unsigned i = 0, e = VL0->getNumOperands(); i < e; ++i) {
@ -1329,13 +1326,13 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
if (Cmp->getPredicate() != P0 ||
Cmp->getOperand(0)->getType() != ComparedTy) {
BS.cancelScheduling(VL);
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
DEBUG(dbgs() << "SLP: Gathering cmp with different predicate.\n");
return;
}
}
newTreeEntry(VL, true);
newTreeEntry(VL, true, false);
DEBUG(dbgs() << "SLP: added a vector of compares.\n");
for (unsigned i = 0, e = VL0->getNumOperands(); i < e; ++i) {
@ -1367,7 +1364,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
case Instruction::And:
case Instruction::Or:
case Instruction::Xor: {
newTreeEntry(VL, true);
newTreeEntry(VL, true, false);
DEBUG(dbgs() << "SLP: added a vector of bin op.\n");
// Sort operands of the instructions so that each side is more likely to
@ -1396,7 +1393,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
if (cast<Instruction>(Val)->getNumOperands() != 2) {
DEBUG(dbgs() << "SLP: not-vectorizable GEP (nested indexes).\n");
BS.cancelScheduling(VL);
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
return;
}
}
@ -1409,7 +1406,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
if (Ty0 != CurTy) {
DEBUG(dbgs() << "SLP: not-vectorizable GEP (different types).\n");
BS.cancelScheduling(VL);
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
return;
}
}
@ -1421,12 +1418,12 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
DEBUG(
dbgs() << "SLP: not-vectorizable GEP (non-constant indexes).\n");
BS.cancelScheduling(VL);
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
return;
}
}
newTreeEntry(VL, true);
newTreeEntry(VL, true, false);
DEBUG(dbgs() << "SLP: added a vector of GEPs.\n");
for (unsigned i = 0, e = 2; i < e; ++i) {
ValueList Operands;
@ -1443,12 +1440,12 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
for (unsigned i = 0, e = VL.size() - 1; i < e; ++i)
if (!isConsecutiveAccess(VL[i], VL[i + 1], *DL, *SE)) {
BS.cancelScheduling(VL);
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
DEBUG(dbgs() << "SLP: Non-consecutive store.\n");
return;
}
newTreeEntry(VL, true);
newTreeEntry(VL, true, false);
DEBUG(dbgs() << "SLP: added a vector of stores.\n");
ValueList Operands;
@ -1466,7 +1463,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
Intrinsic::ID ID = getVectorIntrinsicIDForCall(CI, TLI);
if (!isTriviallyVectorizable(ID)) {
BS.cancelScheduling(VL);
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
DEBUG(dbgs() << "SLP: Non-vectorizable call.\n");
return;
}
@ -1480,7 +1477,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
getVectorIntrinsicIDForCall(CI2, TLI) != ID ||
!CI->hasIdenticalOperandBundleSchema(*CI2)) {
BS.cancelScheduling(VL);
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
DEBUG(dbgs() << "SLP: mismatched calls:" << *CI << "!=" << *VL[i]
<< "\n");
return;
@ -1491,7 +1488,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
Value *A1J = CI2->getArgOperand(1);
if (A1I != A1J) {
BS.cancelScheduling(VL);
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
DEBUG(dbgs() << "SLP: mismatched arguments in call:" << *CI
<< " argument "<< A1I<<"!=" << A1J
<< "\n");
@ -1504,14 +1501,14 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
CI->op_begin() + CI->getBundleOperandsEndIndex(),
CI2->op_begin() + CI2->getBundleOperandsStartIndex())) {
BS.cancelScheduling(VL);
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
DEBUG(dbgs() << "SLP: mismatched bundle operands in calls:" << *CI << "!="
<< *VL[i] << '\n');
return;
}
}
newTreeEntry(VL, true);
newTreeEntry(VL, true, false);
for (unsigned i = 0, e = CI->getNumArgOperands(); i != e; ++i) {
ValueList Operands;
// Prepare the operand vector.
@ -1528,11 +1525,11 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
// then do not vectorize this instruction.
if (!isAltShuffle) {
BS.cancelScheduling(VL);
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
DEBUG(dbgs() << "SLP: ShuffleVector are not vectorized.\n");
return;
}
newTreeEntry(VL, true);
newTreeEntry(VL, true, false);
DEBUG(dbgs() << "SLP: added a ShuffleVector op.\n");
// Reorder operands if reordering would enable vectorization.
@ -1556,7 +1553,7 @@ void BoUpSLP::buildTree_rec(ArrayRef<Value *> VL, unsigned Depth) {
}
default:
BS.cancelScheduling(VL);
newTreeEntry(VL, false);
newTreeEntry(VL, false, false);
DEBUG(dbgs() << "SLP: Gathering unknown instruction.\n");
return;
}
@ -1795,7 +1792,7 @@ int BoUpSLP::getEntryCost(TreeEntry *E) {
TTI->getMemoryOpCost(Instruction::Load, ScalarTy, alignment, 0);
int VecLdCost = TTI->getMemoryOpCost(Instruction::Load,
VecTy, alignment, 0);
if (!E->ShuffleMask.empty()) {
if (E->NeedToShuffle) {
VecLdCost += TTI->getShuffleCost(
TargetTransformInfo::SK_PermuteSingleSrc, VecTy, 0);
}
@ -2361,9 +2358,8 @@ Value *BoUpSLP::vectorizeTree(ArrayRef<Value *> VL) {
if (ScalarToTreeEntry.count(VL[0])) {
int Idx = ScalarToTreeEntry[VL[0]];
TreeEntry *E = &VectorizableTree[Idx];
if (E->isSame(VL) ||
(!E->ShuffleMask.empty() && E->isFoundJumbled(VL, *DL, *SE)))
return vectorizeTree(E);
if (E->isSame(VL) || (E->NeedToShuffle && E->isFoundJumbled(VL, *DL, *SE)))
return vectorizeTree(VL, E);
}
Type *ScalarTy = VL[0]->getType();
@ -2374,10 +2370,10 @@ Value *BoUpSLP::vectorizeTree(ArrayRef<Value *> VL) {
return Gather(VL, VecTy);
}
Value *BoUpSLP::vectorizeTree(TreeEntry *E) {
Value *BoUpSLP::vectorizeTree(ArrayRef<Value *> VL, TreeEntry *E) {
IRBuilder<>::InsertPointGuard Guard(Builder);
if (E->VectorizedValue && E->ShuffleMask.empty()) {
if (E->VectorizedValue && !E->NeedToShuffle) {
DEBUG(dbgs() << "SLP: Diamond merged for " << *E->Scalars[0] << ".\n");
return E->VectorizedValue;
}
@ -2615,18 +2611,27 @@ Value *BoUpSLP::vectorizeTree(TreeEntry *E) {
// As program order of scalar loads are jumbled, the vectorized 'load'
// must be followed by a 'shuffle' with the required jumbled mask.
if (!E->ShuffleMask.empty()) {
if (!VL.empty() && (E->NeedToShuffle)) {
assert(VL.size() == E->Scalars.size() &&
"Equal number of scalars expected");
SmallVector<Constant *, 8> Mask;
for (unsigned Lane = 0, LE = E->ShuffleMask.size(); Lane != LE;
++Lane) {
Mask.push_back(Builder.getInt32(E->ShuffleMask[Lane]));
for (Value *Val : VL) {
if (ScalarToTreeEntry.count(Val)) {
int Idx = ScalarToTreeEntry[Val];
TreeEntry *E = &VectorizableTree[Idx];
for (unsigned Lane = 0, LE = VL.size(); Lane != LE; ++Lane) {
if (E->Scalars[Lane] == Val) {
Mask.push_back(Builder.getInt32(Lane));
break;
}
}
}
}
// Generate shuffle for jumbled memory access
Value *Undef = UndefValue::get(VecTy);
Value *Shuf = Builder.CreateShuffleVector((Value *)LI, Undef,
ConstantVector::get(Mask));
E->VectorizedValue = Shuf;
++NumVectorInstructions;
return Shuf;
}
@ -2811,7 +2816,7 @@ BoUpSLP::vectorizeTree(ExtraValueToDebugLocsMap &ExternallyUsedValues) {
}
Builder.SetInsertPoint(&F->getEntryBlock().front());
auto *VectorRoot = vectorizeTree(&VectorizableTree[0]);
auto *VectorRoot = vectorizeTree(ArrayRef<Value *>(), &VectorizableTree[0]);
// If the vectorized tree can be rewritten in a smaller type, we truncate the
// vectorized root. InstCombine will then rewrite the entire expression. We
@ -2856,20 +2861,8 @@ BoUpSLP::vectorizeTree(ExtraValueToDebugLocsMap &ExternallyUsedValues) {
Value *Vec = E->VectorizedValue;
assert(Vec && "Can't find vectorizable value");
unsigned i = 0;
Value *Lane;
// In case vectorizable scalars use are not in-order, scalars would have
// been shuffled.Recompute the proper Lane of ExternalUse.
if (!E->ShuffleMask.empty()) {
SmallVector<unsigned, 4> Val(E->ShuffleMask.size());
for (; i < E->ShuffleMask.size(); i++) {
if (E->ShuffleMask[i] == (unsigned)ExternalUse.Lane)
break;
}
Lane = Builder.getInt32(i);
} else {
Lane = Builder.getInt32(ExternalUse.Lane);
}
Value *Lane = Builder.getInt32(ExternalUse.Lane);
// If User == nullptr, the Scalar is used as extra arg. Generate
// ExtractElement instruction and update the record for this scalar in
// ExternallyUsedValues.

43
llvm/test/Transforms/SLPVectorizer/X86/jumbled-load-bug.ll
View File

@ -1,43 +0,0 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
; RUN: opt < %s -S -slp-vectorizer | FileCheck %s
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
define <4 x i32> @zot() #0 {
; CHECK-LABEL: @zot(
; CHECK-NEXT: bb:
; CHECK-NEXT: [[P0:%.*]] = getelementptr inbounds [4 x i8], [4 x i8]* undef, i64 undef, i64 0
; CHECK-NEXT: [[P1:%.*]] = getelementptr inbounds [4 x i8], [4 x i8]* undef, i64 undef, i64 1
; CHECK-NEXT: [[P2:%.*]] = getelementptr inbounds [4 x i8], [4 x i8]* undef, i64 undef, i64 2
; CHECK-NEXT: [[P3:%.*]] = getelementptr inbounds [4 x i8], [4 x i8]* undef, i64 undef, i64 3
; CHECK-NEXT: [[TMP0:%.*]] = bitcast i8* [[P0]] to <4 x i8>*
; CHECK-NEXT: [[TMP1:%.*]] = load <4 x i8>, <4 x i8>* [[TMP0]], align 1
; CHECK-NEXT: [[TMP2:%.*]] = shufflevector <4 x i8> [[TMP1]], <4 x i8> undef, <4 x i32> <i32 1, i32 0, i32 2, i32 3>
; CHECK-NEXT: [[TMP3:%.*]] = extractelement <4 x i8> [[TMP2]], i32 0
; CHECK-NEXT: [[I0:%.*]] = insertelement <4 x i8> undef, i8 [[TMP3]], i32 0
; CHECK-NEXT: [[TMP4:%.*]] = extractelement <4 x i8> [[TMP2]], i32 1
; CHECK-NEXT: [[I1:%.*]] = insertelement <4 x i8> [[I0]], i8 [[TMP4]], i32 1
; CHECK-NEXT: [[TMP5:%.*]] = extractelement <4 x i8> [[TMP2]], i32 2
; CHECK-NEXT: [[I2:%.*]] = insertelement <4 x i8> [[I1]], i8 [[TMP5]], i32 2
; CHECK-NEXT: [[TMP6:%.*]] = extractelement <4 x i8> [[TMP2]], i32 3
; CHECK-NEXT: [[I3:%.*]] = insertelement <4 x i8> [[I2]], i8 [[TMP6]], i32 3
; CHECK-NEXT: [[RET:%.*]] = zext <4 x i8> [[I3]] to <4 x i32>
; CHECK-NEXT: ret <4 x i32> [[RET]]
;
bb:
%p0 = getelementptr inbounds [4 x i8], [4 x i8]* undef, i64 undef, i64 0
%p1 = getelementptr inbounds [4 x i8], [4 x i8]* undef, i64 undef, i64 1
%p2 = getelementptr inbounds [4 x i8], [4 x i8]* undef, i64 undef, i64 2
%p3 = getelementptr inbounds [4 x i8], [4 x i8]* undef, i64 undef, i64 3
%v3 = load i8, i8* %p3, align 1
%v2 = load i8, i8* %p2, align 1
%v0 = load i8, i8* %p0, align 1
%v1 = load i8, i8* %p1, align 1
%i0 = insertelement <4 x i8> undef, i8 %v1, i32 0
%i1 = insertelement <4 x i8> %i0, i8 %v0, i32 1
%i2 = insertelement <4 x i8> %i1, i8 %v2, i32 2
%i3 = insertelement <4 x i8> %i2, i8 %v3, i32 3
%ret = zext <4 x i8> %i3 to <4 x i32>
ret <4 x i32> %ret
}

2
llvm/test/Transforms/SLPVectorizer/X86/jumbled-same.ll
View File

@ -13,7 +13,7 @@ define i32 @fn1() {
; CHECK-NEXT: [[TMP0:%.*]] = load <4 x i32>, <4 x i32>* bitcast ([4 x i32]* @b to <4 x i32>*), align 4
; CHECK-NEXT: [[TMP1:%.*]] = shufflevector <4 x i32> [[TMP0]], <4 x i32> undef, <4 x i32> <i32 1, i32 2, i32 3, i32 0>
; CHECK-NEXT: [[TMP2:%.*]] = icmp sgt <4 x i32> [[TMP1]], zeroinitializer
; CHECK-NEXT: [[TMP3:%.*]] = extractelement <4 x i32> [[TMP1]], i32 0
; CHECK-NEXT: [[TMP3:%.*]] = extractelement <4 x i32> [[TMP0]], i32 1
; CHECK-NEXT: [[TMP4:%.*]] = insertelement <4 x i32> undef, i32 [[TMP3]], i32 0
; CHECK-NEXT: [[TMP5:%.*]] = insertelement <4 x i32> [[TMP4]], i32 ptrtoint (i32 ()* @fn1 to i32), i32 1
; CHECK-NEXT: [[TMP6:%.*]] = insertelement <4 x i32> [[TMP5]], i32 ptrtoint (i32 ()* @fn1 to i32), i32 2