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Allow LdSlotArr to be hoisted across calls when the result is known to be invariant #5856

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Allow LdSlotArr to be hoisted across calls when the result is known to be invariant #5856

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18 changes: 18 additions & 0 deletions lib/Backend/Func.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -126,6 +126,7 @@ Func::Func(JitArenaAllocator *alloc, JITTimeWorkItem * workItem,
#endif
, m_funcStartLabel(nullptr)
, m_funcEndLabel(nullptr)
, bvStableSlotSyms(nullptr)
#if DBG
, hasCalledSetDoFastPaths(false)
, allowRemoveBailOutArgInstr(false)
Expand Down Expand Up @@ -172,6 +173,8 @@ Func::Func(JitArenaAllocator *alloc, JITTimeWorkItem * workItem,
outputData->hasJittedStackClosure = false;
outputData->localVarSlotsOffset = m_localVarSlotsOffset;
outputData->localVarChangedOffset = m_hasLocalVarChangedOffset;

this->bvStableSlotSyms = Anew(this->m_alloc, BVSparse<JitArenaAllocator>, this->m_alloc);
}

if (this->IsInlined())
Expand Down Expand Up @@ -808,6 +811,21 @@ void Func::OnAddSym(Sym* sym)
}
}

void Func::AddStableSlotSym(PropertySym *sym)
{
this->GetTopFunc()->bvStableSlotSyms->Set(sym->m_id);
}

bool Func::IsStableSlotSym(PropertySym *sym) const
{
return this->GetTopFunc()->bvStableSlotSyms->Test(sym->m_id);
}

BVSparse<JitArenaAllocator> *Func::GetStableSlotSyms() const
{
return this->GetTopFunc()->bvStableSlotSyms;
}

///
/// Returns offset of the flag (1 byte) whether any local was changed (in debugger).
/// If the function does not have any locals, returns -1.
Expand Down
5 changes: 5 additions & 0 deletions lib/Backend/Func.h
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Expand Up @@ -442,6 +442,10 @@ static const unsigned __int64 c_debugFillPattern8 = 0xcececececececece;
StackSym *GetLocalFrameDisplaySym() const { return m_localFrameDisplaySym; }
void SetLocalFrameDisplaySym(StackSym *sym) { m_localFrameDisplaySym = sym; }

void AddStableSlotSym(PropertySym *sym);
bool IsStableSlotSym(PropertySym *sym) const;
BVSparse<JitArenaAllocator> *GetStableSlotSyms() const;

intptr_t GetJittedLoopIterationsSinceLastBailoutAddress() const;
void EnsurePinnedTypeRefs();
void PinTypeRef(void* typeRef);
Expand Down Expand Up @@ -724,6 +728,7 @@ static const unsigned __int64 c_debugFillPattern8 = 0xcececececececece;
BitVector m_regsUsed;
StackSym * tempSymDouble;
StackSym * tempSymBool;
BVSparse<JitArenaAllocator> * bvStableSlotSyms;
uint32 loopCount;
uint32 unoptimizableArgumentsObjReference;
Js::ProfileId callSiteIdInParentFunc;
Expand Down
7 changes: 3 additions & 4 deletions lib/Backend/GlobOptFields.cpp
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Expand Up @@ -242,7 +242,7 @@ GlobOpt::KillLiveElems(IR::IndirOpnd * indirOpnd, BVSparse<JitArenaAllocator> *
void
GlobOpt::KillAllFields(BVSparse<JitArenaAllocator> * bv)
{
bv->ClearAll();
bv->And(func->GetStableSlotSyms());
if (this->IsLoopPrePass())
{
for (Loop * loop = this->rootLoopPrePass; loop != nullptr; loop = loop->parent)
Expand Down Expand Up @@ -447,9 +447,8 @@ GlobOpt::ProcessFieldKills(IR::Instr *instr, BVSparse<JitArenaAllocator> *bv, bo
void
GlobOpt::ProcessFieldKills(IR::Instr * instr)
{
if (!this->DoFieldCopyProp() && !this->DoFieldRefOpts() && !DoCSE())
if (this->currentBlock->globOptData.liveFields->IsEmpty())
{
Assert(this->currentBlock->globOptData.liveFields->IsEmpty());
return;
}

Expand Down Expand Up @@ -1808,7 +1807,7 @@ GlobOpt::CopyPropPropertySymObj(IR::SymOpnd *symOpnd, IR::Instr *instr)
if (copySym != nullptr)
{
PropertySym *newProp = PropertySym::FindOrCreate(
copySym->m_id, propertySym->m_propertyId, propertySym->GetPropertyIdIndex(), propertySym->GetInlineCacheIndex(), propertySym->m_fieldKind, this->func);
copySym->m_id, propertySym->m_propertyId, propertySym->GetPropertyIdIndex(), propertySym->GetInlineCacheIndex(), propertySym->m_fieldKind, this->func, this->func->IsStableSlotSym(propertySym));

if (!this->IsLoopPrePass() || SafeToCopyPropInPrepass(objSym, copySym, val))
{
Expand Down
18 changes: 12 additions & 6 deletions lib/Backend/IRBuilder.cpp
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Expand Up @@ -1212,10 +1212,10 @@ IRBuilder::BuildIndirOpnd(IR::RegOpnd *baseReg, uint32 offset, const char16 *des
#endif

IR::SymOpnd *
IRBuilder::BuildFieldOpnd(Js::OpCode newOpcode, Js::RegSlot reg, Js::PropertyId propertyId, Js::PropertyIdIndexType propertyIdIndex, PropertyKind propertyKind, uint inlineCacheIndex)
IRBuilder::BuildFieldOpnd(Js::OpCode newOpcode, Js::RegSlot reg, Js::PropertyId propertyId, Js::PropertyIdIndexType propertyIdIndex, PropertyKind propertyKind, uint inlineCacheIndex, bool stableSlotSym)
{
AssertOrFailFast(inlineCacheIndex < m_func->GetJITFunctionBody()->GetInlineCacheCount() || inlineCacheIndex == Js::Constants::NoInlineCacheIndex);
PropertySym * propertySym = BuildFieldSym(reg, propertyId, propertyIdIndex, inlineCacheIndex, propertyKind);
PropertySym * propertySym = BuildFieldSym(reg, propertyId, propertyIdIndex, inlineCacheIndex, propertyKind, stableSlotSym);
IR::SymOpnd * symOpnd;

// If we plan to apply object type optimization to this instruction or if we intend to emit a fast path using an inline
Expand Down Expand Up @@ -1243,14 +1243,14 @@ IRBuilder::BuildFieldOpnd(Js::OpCode newOpcode, Js::RegSlot reg, Js::PropertyId
}

PropertySym *
IRBuilder::BuildFieldSym(Js::RegSlot reg, Js::PropertyId propertyId, Js::PropertyIdIndexType propertyIdIndex, uint inlineCacheIndex, PropertyKind propertyKind)
IRBuilder::BuildFieldSym(Js::RegSlot reg, Js::PropertyId propertyId, Js::PropertyIdIndexType propertyIdIndex, uint inlineCacheIndex, PropertyKind propertyKind, bool stableSlotSym)
{
PropertySym * propertySym;
SymID symId = this->BuildSrcStackSymID(reg);

AssertMsg(m_func->m_symTable->FindStackSym(symId), "Tried to use an undefined stacksym?");

propertySym = PropertySym::FindOrCreate(symId, propertyId, propertyIdIndex, inlineCacheIndex, propertyKind, m_func);
propertySym = PropertySym::FindOrCreate(symId, propertyId, propertyIdIndex, inlineCacheIndex, propertyKind, m_func, stableSlotSym);

return propertySym;
}
Expand Down Expand Up @@ -3882,6 +3882,7 @@ IRBuilder::BuildElementSlotI2(Js::OpCode newOpcode, uint32 offset, Js::RegSlot r
IR::Instr *instr;
PropertySym *fieldSym;
bool isLdSlotThatWasNotProfiled = false;
bool stableSlots = false;

switch (newOpcode)
{
Expand Down Expand Up @@ -3916,13 +3917,18 @@ IRBuilder::BuildElementSlotI2(Js::OpCode newOpcode, uint32 offset, Js::RegSlot r
}

case Js::OpCode::LdEnvSlot:
case Js::OpCode::LdEnvObjSlot:
case Js::OpCode::StEnvSlot:
case Js::OpCode::StEnvSlotChkUndecl:
stableSlots = true;
goto SlotsCommon;

case Js::OpCode::LdEnvObjSlot:
case Js::OpCode::StEnvObjSlot:
case Js::OpCode::StEnvObjSlotChkUndecl:
stableSlots = false;

fieldOpnd = this->BuildFieldOpnd(Js::OpCode::LdSlotArr, this->GetEnvReg(), slotId1, (Js::PropertyIdIndexType)-1, PropertyKindSlotArray);
SlotsCommon:
fieldOpnd = this->BuildFieldOpnd(Js::OpCode::LdSlotArr, this->GetEnvReg(), slotId1, (Js::PropertyIdIndexType)-1, PropertyKindSlotArray, (uint)-1, stableSlots);
regOpnd = IR::RegOpnd::New(TyVar, m_func);
instr = IR::Instr::New(Js::OpCode::LdSlotArr, regOpnd, fieldOpnd, m_func);
this->AddInstr(instr, offset);
Expand Down
4 changes: 2 additions & 2 deletions lib/Backend/IRBuilder.h
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Expand Up @@ -211,8 +211,8 @@ class IRBuilder
#if DBG_DUMP || defined(ENABLE_IR_VIEWER)
IR::IndirOpnd * BuildIndirOpnd(IR::RegOpnd *baseReg, uint32 offset, const char16 *desc);
#endif
IR::SymOpnd * BuildFieldOpnd(Js::OpCode newOpCode, Js::RegSlot reg, Js::PropertyId propertyId, Js::PropertyIdIndexType propertyIdIndex, PropertyKind propertyKind, uint inlineCacheIndex = -1);
PropertySym * BuildFieldSym(Js::RegSlot reg, Js::PropertyId propertyId, Js::PropertyIdIndexType propertyIdIndex, uint inlineCacheIndex, PropertyKind propertyKind);
IR::SymOpnd * BuildFieldOpnd(Js::OpCode newOpCode, Js::RegSlot reg, Js::PropertyId propertyId, Js::PropertyIdIndexType propertyIdIndex, PropertyKind propertyKind, uint inlineCacheIndex = -1, bool stableSlotSym = false);
PropertySym * BuildFieldSym(Js::RegSlot reg, Js::PropertyId propertyId, Js::PropertyIdIndexType propertyIdIndex, uint inlineCacheIndex, PropertyKind propertyKind, bool stableSlotSym = false);
SymID BuildSrcStackSymID(Js::RegSlot regSlot);
IR::RegOpnd * BuildDstOpnd(Js::RegSlot dstRegSlot, IRType type = TyVar, bool isCatchObjectSym = false);
IR::RegOpnd * BuildSrcOpnd(Js::RegSlot srcRegSlot, IRType type = TyVar);
Expand Down
17 changes: 12 additions & 5 deletions lib/Backend/Sym.cpp
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Expand Up @@ -949,18 +949,18 @@ StackSym *StackSym::EnsureAuxSlotPtrSym(Func * func)
///----------------------------------------------------------------------------

PropertySym *
PropertySym::New(SymID stackSymID, int32 propertyId, uint32 propertyIdIndex, uint inlineCacheIndex, PropertyKind fieldKind, Func *func)
PropertySym::New(SymID stackSymID, int32 propertyId, uint32 propertyIdIndex, uint inlineCacheIndex, PropertyKind fieldKind, Func *func, bool stableSlotSym)
{
StackSym * stackSym;

stackSym = func->m_symTable->FindStackSym(stackSymID);
AssertMsg(stackSym != nullptr, "Adding propertySym to non-existing stackSym... Can this happen??");

return PropertySym::New(stackSym, propertyId, propertyIdIndex, inlineCacheIndex, fieldKind, func);
return PropertySym::New(stackSym, propertyId, propertyIdIndex, inlineCacheIndex, fieldKind, func, stableSlotSym);
}

PropertySym *
PropertySym::New(StackSym *stackSym, int32 propertyId, uint32 propertyIdIndex, uint inlineCacheIndex, PropertyKind fieldKind, Func *func)
PropertySym::New(StackSym *stackSym, int32 propertyId, uint32 propertyIdIndex, uint inlineCacheIndex, PropertyKind fieldKind, Func *func, bool stableSlotSym)
{
PropertySym * propertySym;

Expand Down Expand Up @@ -989,6 +989,12 @@ PropertySym::New(StackSym *stackSym, int32 propertyId, uint32 propertyIdIndex, u

func->m_symTable->Add(propertySym);

if (stableSlotSym)
{
Assert(fieldKind == PropertyKindSlots || fieldKind == PropertyKindLocalSlots || fieldKind == PropertyKindSlotArray);
func->AddStableSlotSym(propertySym);
}

// Keep track of all the property we use from this sym so we can invalidate
// the value in glob opt
ObjectSymInfo * objectSymInfo = stackSym->EnsureObjectInfo(func);
Expand Down Expand Up @@ -1022,18 +1028,19 @@ PropertySym::Find(SymID stackSymID, int32 propertyId, Func *func)
///----------------------------------------------------------------------------

PropertySym *
PropertySym::FindOrCreate(SymID stackSymID, int32 propertyId, uint32 propertyIdIndex, uint inlineCacheIndex, PropertyKind fieldKind, Func *func)
PropertySym::FindOrCreate(SymID stackSymID, int32 propertyId, uint32 propertyIdIndex, uint inlineCacheIndex, PropertyKind fieldKind, Func *func, bool stableSlotSym)
{
PropertySym * propertySym;

propertySym = Find(stackSymID, propertyId, func);

if (propertySym)
{
Assert(stableSlotSym == func->IsStableSlotSym(propertySym));
return propertySym;
}

return PropertySym::New(stackSymID, propertyId, propertyIdIndex, inlineCacheIndex, fieldKind, func);
return PropertySym::New(stackSymID, propertyId, propertyIdIndex, inlineCacheIndex, fieldKind, func, stableSlotSym);
}
#if DBG_DUMP || defined(ENABLE_IR_VIEWER)

Expand Down
6 changes: 3 additions & 3 deletions lib/Backend/Sym.h
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Expand Up @@ -304,10 +304,10 @@ class PropertySym: public Sym
{
friend class Sym;
public:
static PropertySym * New(SymID stackSymID, int32 propertyId, uint32 propertyIdIndex, uint inlineCacheIndex, PropertyKind fieldKind, Func *func);
static PropertySym * New(StackSym *stackSym, int32 propertyId, uint32 propertyIdIndex, uint inlineCacheIndex, PropertyKind fieldKind, Func *func);
static PropertySym * New(SymID stackSymID, int32 propertyId, uint32 propertyIdIndex, uint inlineCacheIndex, PropertyKind fieldKind, Func *func, bool stableSlotSym = false);
static PropertySym * New(StackSym *stackSym, int32 propertyId, uint32 propertyIdIndex, uint inlineCacheIndex, PropertyKind fieldKind, Func *func, bool stableSlotSym = false);
static PropertySym * Find(SymID stackSymID, int32 propertyId, Func *func);
static PropertySym * FindOrCreate(SymID stackSymID, int32 propertyId, uint32 propertyIdIndex, uint inlineCacheIndex, PropertyKind fieldKind, Func *func);
static PropertySym * FindOrCreate(SymID stackSymID, int32 propertyId, uint32 propertyIdIndex, uint inlineCacheIndex, PropertyKind fieldKind, Func *func, bool stableSlotSym = false);

Func *GetFunc() { return m_func; }
bool HasPropertyIdIndex() { return m_propertyIdIndex != -1; }
Expand Down