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[SLP] Initialize VectorizedValue when gathering
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We abort building vectorizable trees in some cases (e.g., if the maximum
recursion depth is reached, if the region size is too large, etc.). If this
happens for a reduction, we can be left with a root entry that needs to be
gathered. For these cases, we need make sure we actually set VectorizedValue to
the resulting vector.

This patch ensures we properly set VectorizedValue, and it also ensures the
insertelement sequence generated for the gathers is inserted at the correct
location.

Reference: https://llvm.org/bugs/show_bug.cgi?id=28330
Differential Revison: https://reviews.llvm.org/D23410

llvm-svn: 279125
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@mssimpso
mssimpso committed Aug 18, 2016
1 parent 075d0c2 commit 11db6b6
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Showing 2 changed files with 161 additions and 8 deletions.
74 changes: 66 additions & 8 deletions llvm/lib/Transforms/Vectorize/SLPVectorizer.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2153,11 +2153,61 @@ void BoUpSLP::reorderInputsAccordingToOpcode(ArrayRef<Value *> VL,
}

void BoUpSLP::setInsertPointAfterBundle(ArrayRef<Value *> VL) {
Instruction *VL0 = cast<Instruction>(VL[0]);
BasicBlock::iterator NextInst(VL0);
++NextInst;
Builder.SetInsertPoint(VL0->getParent(), NextInst);
Builder.SetCurrentDebugLocation(VL0->getDebugLoc());

// Get the basic block this bundle is in. All instructions in the bundle
// should be in this block.
auto *Front = cast<Instruction>(VL.front());
auto *BB = Front->getParent();
assert(all_of(make_range(VL.begin(), VL.end()), [&](Value *V) -> bool {
return cast<Instruction>(V)->getParent() == BB;
}));

// The last instruction in the bundle in program order.
Instruction *LastInst = nullptr;

// Find the last instruction. The common case should be that BB has been
// scheduled, and the last instruction is VL.back(). So we start with
// VL.back() and iterate over schedule data until we reach the end of the
// bundle. The end of the bundle is marked by null ScheduleData.
if (BlocksSchedules.count(BB)) {
auto *Bundle = BlocksSchedules[BB]->getScheduleData(VL.back());
if (Bundle && Bundle->isPartOfBundle())
for (; Bundle; Bundle = Bundle->NextInBundle)
LastInst = Bundle->Inst;
}

// LastInst can still be null at this point if there's either not an entry
// for BB in BlocksSchedules or there's no ScheduleData available for
// VL.back(). This can be the case if buildTree_rec aborts for various
// reasons (e.g., the maximum recursion depth is reached, the maximum region
// size is reached, etc.). ScheduleData is initialized in the scheduling
// "dry-run".
//
// If this happens, we can still find the last instruction by brute force. We
// iterate forwards from Front (inclusive) until we either see all
// instructions in the bundle or reach the end of the block. If Front is the
// last instruction in program order, LastInst will be set to Front, and we
// will visit all the remaining instructions in the block.
//
// One of the reasons we exit early from buildTree_rec is to place an upper
// bound on compile-time. Thus, taking an additional compile-time hit here is
// not ideal. However, this should be exceedingly rare since it requires that
// we both exit early from buildTree_rec and that the bundle be out-of-order
// (causing us to iterate all the way to the end of the block).
if (!LastInst) {
SmallPtrSet<Value *, 16> Bundle(VL.begin(), VL.end());
for (auto &I : make_range(BasicBlock::iterator(Front), BB->end())) {
if (Bundle.erase(&I))
LastInst = &I;
if (Bundle.empty())
break;
}
}

// Set the insertion point after the last instruction in the bundle. Set the
// debug location to Front.
Builder.SetInsertPoint(BB, next(BasicBlock::iterator(LastInst)));
Builder.SetCurrentDebugLocation(Front->getDebugLoc());
}

Value *BoUpSLP::Gather(ArrayRef<Value *> VL, VectorType *Ty) {
Expand Down Expand Up @@ -2235,7 +2285,9 @@ Value *BoUpSLP::vectorizeTree(TreeEntry *E) {

if (E->NeedToGather) {
setInsertPointAfterBundle(E->Scalars);
return Gather(E->Scalars, VecTy);
auto *V = Gather(E->Scalars, VecTy);
E->VectorizedValue = V;
return V;
}

unsigned Opcode = getSameOpcode(E->Scalars);
Expand Down Expand Up @@ -2282,7 +2334,10 @@ Value *BoUpSLP::vectorizeTree(TreeEntry *E) {
E->VectorizedValue = V;
return V;
}
return Gather(E->Scalars, VecTy);
setInsertPointAfterBundle(E->Scalars);
auto *V = Gather(E->Scalars, VecTy);
E->VectorizedValue = V;
return V;
}
case Instruction::ExtractValue: {
if (canReuseExtract(E->Scalars, Instruction::ExtractValue)) {
Expand All @@ -2294,7 +2349,10 @@ Value *BoUpSLP::vectorizeTree(TreeEntry *E) {
E->VectorizedValue = V;
return propagateMetadata(V, E->Scalars);
}
return Gather(E->Scalars, VecTy);
setInsertPointAfterBundle(E->Scalars);
auto *V = Gather(E->Scalars, VecTy);
E->VectorizedValue = V;
return V;
}
case Instruction::ZExt:
case Instruction::SExt:
Expand Down
95 changes: 95 additions & 0 deletions llvm/test/Transforms/SLPVectorizer/AArch64/gather-root.ll
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Original file line number Diff line number Diff line change
@@ -0,0 +1,95 @@
; RUN: opt < %s -slp-vectorizer -S | FileCheck %s --check-prefix=DEFAULT
; RUN: opt < %s -slp-recursion-max-depth=0 -slp-vectorizer -S | FileCheck %s --check-prefix=GATHER

target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
target triple = "aarch64--linux-gnu"

@a = common global [80 x i8] zeroinitializer, align 16

; DEFAULT-LABEL: @PR28330(
; DEFAULT: %tmp17 = phi i32 [ %tmp34, %for.body ], [ 0, %entry ]
; DEFAULT: %tmp18 = phi i32 [ %tmp35, %for.body ], [ %n, %entry ]
; DEFAULT: %[[S0:.+]] = select <8 x i1> %1, <8 x i32> <i32 -720, i32 -720, i32 -720, i32 -720, i32 -720, i32 -720, i32 -720, i32 -720>, <8 x i32> <i32 -80, i32 -80, i32 -80, i32 -80, i32 -80, i32 -80, i32 -80, i32 -80>
; DEFAULT: %[[R0:.+]] = shufflevector <8 x i32> %[[S0]], <8 x i32> undef, <8 x i32> <i32 4, i32 5, i32 6, i32 7, i32 undef, i32 undef, i32 undef, i32 undef>
; DEFAULT: %[[R1:.+]] = add <8 x i32> %[[S0]], %[[R0]]
; DEFAULT: %[[R2:.+]] = shufflevector <8 x i32> %[[R1]], <8 x i32> undef, <8 x i32> <i32 2, i32 3, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef>
; DEFAULT: %[[R3:.+]] = add <8 x i32> %[[R1]], %[[R2]]
; DEFAULT: %[[R4:.+]] = shufflevector <8 x i32> %[[R3]], <8 x i32> undef, <8 x i32> <i32 1, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef>
; DEFAULT: %[[R5:.+]] = add <8 x i32> %[[R3]], %[[R4]]
; DEFAULT: %[[R6:.+]] = extractelement <8 x i32> %[[R5]], i32 0
; DEFAULT: %tmp34 = add i32 %[[R6]], %tmp17
;
; GATHER-LABEL: @PR28330(
; GATHER: %tmp17 = phi i32 [ %tmp34, %for.body ], [ 0, %entry ]
; GATHER: %tmp18 = phi i32 [ %tmp35, %for.body ], [ %n, %entry ]
; GATHER: %tmp19 = select i1 %tmp1, i32 -720, i32 -80
; GATHER: %tmp21 = select i1 %tmp3, i32 -720, i32 -80
; GATHER: %tmp23 = select i1 %tmp5, i32 -720, i32 -80
; GATHER: %tmp25 = select i1 %tmp7, i32 -720, i32 -80
; GATHER: %tmp27 = select i1 %tmp9, i32 -720, i32 -80
; GATHER: %tmp29 = select i1 %tmp11, i32 -720, i32 -80
; GATHER: %tmp31 = select i1 %tmp13, i32 -720, i32 -80
; GATHER: %tmp33 = select i1 %tmp15, i32 -720, i32 -80
; GATHER: %[[I0:.+]] = insertelement <8 x i32> undef, i32 %tmp19, i32 0
; GATHER: %[[I1:.+]] = insertelement <8 x i32> %[[I0]], i32 %tmp21, i32 1
; GATHER: %[[I2:.+]] = insertelement <8 x i32> %[[I1]], i32 %tmp23, i32 2
; GATHER: %[[I3:.+]] = insertelement <8 x i32> %[[I2]], i32 %tmp25, i32 3
; GATHER: %[[I4:.+]] = insertelement <8 x i32> %[[I3]], i32 %tmp27, i32 4
; GATHER: %[[I5:.+]] = insertelement <8 x i32> %[[I4]], i32 %tmp29, i32 5
; GATHER: %[[I6:.+]] = insertelement <8 x i32> %[[I5]], i32 %tmp31, i32 6
; GATHER: %[[I7:.+]] = insertelement <8 x i32> %[[I6]], i32 %tmp33, i32 7
; GATHER: %[[R0:.+]] = shufflevector <8 x i32> %[[I7]], <8 x i32> undef, <8 x i32> <i32 4, i32 5, i32 6, i32 7, i32 undef, i32 undef, i32 undef, i32 undef>
; GATHER: %[[R1:.+]] = add <8 x i32> %[[I7]], %[[R0]]
; GATHER: %[[R2:.+]] = shufflevector <8 x i32> %[[R1]], <8 x i32> undef, <8 x i32> <i32 2, i32 3, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef>
; GATHER: %[[R3:.+]] = add <8 x i32> %[[R1]], %[[R2]]
; GATHER: %[[R4:.+]] = shufflevector <8 x i32> %[[R3]], <8 x i32> undef, <8 x i32> <i32 1, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef, i32 undef>
; GATHER: %[[R5:.+]] = add <8 x i32> %[[R3]], %[[R4]]
; GATHER: %[[R6:.+]] = extractelement <8 x i32> %[[R5]], i32 0
; GATHER: %tmp34 = add i32 %[[R6]], %tmp17

define void @PR28330(i32 %n) {
entry:
%tmp0 = load i8, i8* getelementptr inbounds ([80 x i8], [80 x i8]* @a, i64 0, i64 1), align 1
%tmp1 = icmp eq i8 %tmp0, 0
%tmp2 = load i8, i8* getelementptr inbounds ([80 x i8], [80 x i8]* @a, i64 0, i64 2), align 2
%tmp3 = icmp eq i8 %tmp2, 0
%tmp4 = load i8, i8* getelementptr inbounds ([80 x i8], [80 x i8]* @a, i64 0, i64 3), align 1
%tmp5 = icmp eq i8 %tmp4, 0
%tmp6 = load i8, i8* getelementptr inbounds ([80 x i8], [80 x i8]* @a, i64 0, i64 4), align 4
%tmp7 = icmp eq i8 %tmp6, 0
%tmp8 = load i8, i8* getelementptr inbounds ([80 x i8], [80 x i8]* @a, i64 0, i64 5), align 1
%tmp9 = icmp eq i8 %tmp8, 0
%tmp10 = load i8, i8* getelementptr inbounds ([80 x i8], [80 x i8]* @a, i64 0, i64 6), align 2
%tmp11 = icmp eq i8 %tmp10, 0
%tmp12 = load i8, i8* getelementptr inbounds ([80 x i8], [80 x i8]* @a, i64 0, i64 7), align 1
%tmp13 = icmp eq i8 %tmp12, 0
%tmp14 = load i8, i8* getelementptr inbounds ([80 x i8], [80 x i8]* @a, i64 0, i64 8), align 8
%tmp15 = icmp eq i8 %tmp14, 0
br label %for.body

for.body:
%tmp17 = phi i32 [ %tmp34, %for.body ], [ 0, %entry ]
%tmp18 = phi i32 [ %tmp35, %for.body ], [ %n, %entry ]
%tmp19 = select i1 %tmp1, i32 -720, i32 -80
%tmp20 = add i32 %tmp17, %tmp19
%tmp21 = select i1 %tmp3, i32 -720, i32 -80
%tmp22 = add i32 %tmp20, %tmp21
%tmp23 = select i1 %tmp5, i32 -720, i32 -80
%tmp24 = add i32 %tmp22, %tmp23
%tmp25 = select i1 %tmp7, i32 -720, i32 -80
%tmp26 = add i32 %tmp24, %tmp25
%tmp27 = select i1 %tmp9, i32 -720, i32 -80
%tmp28 = add i32 %tmp26, %tmp27
%tmp29 = select i1 %tmp11, i32 -720, i32 -80
%tmp30 = add i32 %tmp28, %tmp29
%tmp31 = select i1 %tmp13, i32 -720, i32 -80
%tmp32 = add i32 %tmp30, %tmp31
%tmp33 = select i1 %tmp15, i32 -720, i32 -80
%tmp34 = add i32 %tmp32, %tmp33
%tmp35 = add nsw i32 %tmp18, -1
%tmp36 = icmp eq i32 %tmp35, 0
br i1 %tmp36, label %for.end, label %for.body

for.end:
ret void
}

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